CN112635824A - Lithium ion battery electrolyte and lithium ion battery - Google Patents
Lithium ion battery electrolyte and lithium ion battery Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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Abstract
The invention relates to a lithium ion battery electrolyte and a lithium ion battery, wherein the lithium ion battery electrolyte is a liquid containing lithium salt, an organic solvent and a positive electrode protection additive, the electrolyte also contains a first negative electrode film forming additive and a second negative electrode film forming additive, the first negative electrode film forming additive comprises propylene fluoro carbonate and 1, 3-propane sultone or 1, 3-propylene sultone, and the second negative electrode film forming additive comprises a carbonate additive and a lithium salt type additive. In the lithium ion battery electrolyte disclosed by the invention, a proper amount of the second negative electrode film-forming additive and the first negative electrode film-forming additive are cooperated with each other, so that an SEI (solid electrolyte interphase) film with good compactness, good elasticity and acid corrosion resistance can be formed on the surface of a negative electrode, the degradation effect of the positive electrode protection additive on the SEI film can be reduced, the high-temperature cycle performance of a high-voltage lithium ion battery can be improved, and the high-temperature storage performance requirement can be met.
Description
Technical Field
The disclosure relates to the technical field of lithium ion batteries, in particular to a lithium ion battery electrolyte and a lithium ion battery comprising the same.
Background
With the development of lithium ion battery technology, the requirement for the use temperature of the lithium ion battery in the industry is higher and higher, and particularly in a high-voltage battery system, the high-temperature cycle and the high-temperature storage performance are important indexes for evaluating the performance of the lithium ion battery. The electrolyte of the lithium ion battery plays a role in conducting electrons between the anode and the cathode of the lithium ion battery, the anode can oxidize the electrolyte and generate gas in the using process of the lithium ion battery, and the anode can be aggravated to oxidize the electrolyte under the conditions of high temperature and high pressure, so that the circulation and storage performance of the battery are influenced.
In the prior art, the amount of the positive electrode protection additive in the electrolyte is generally increased to inhibit the reaction of the positive electrode oxidizing the electrolyte under high temperature and high pressure conditions, thereby improving the cycle and storage performance of the battery.
However, in practical research and use, it was found that the addition of sufficient positive electrode protective additive to a high voltage battery system can sufficiently protect the positive electrode, but the excessive positive electrode protective additive may deteriorate the SEI film on the surface of the negative electrode, and thus, the improvement effect on the battery cycle performance is poor.
Disclosure of Invention
The invention aims to overcome the problem that in the prior art, excessive positive electrode protection additives in a high-voltage battery system can degrade an SEI (solid electrolyte interface) film on the surface of a negative electrode to cause poor battery cycle performance, and provides a lithium ion battery electrolyte and a lithium ion battery.
In order to achieve the above object, the present disclosure provides a lithium ion battery electrolyte, which is a liquid containing a lithium salt, an organic solvent, and a positive electrode protective additive, and further contains a first negative electrode film-forming additive and a second negative electrode film-forming additive, wherein the first negative electrode film-forming additive includes propylene fluorocarbonate and 1, 3-propane sultone or 1, 3-propene sultone, and the second negative electrode film-forming additive includes a carbonate additive and a lithium salt type additive;
optionally, the carbonate additive comprises ethylene carbonate and/or propylene carbonate and the lithium salt type additive comprises lithium difluorooxalato borate and/or lithium bis-oxalato borate.
Optionally, based on 100 parts by weight of the electrolyte, the content of the fluoropropylene carbonate is 3-15 parts by weight, the content of the 1, 3-propane sultone is 2-6 parts by weight or the content of the 1, 3-propylene sultone is 0.1-5 parts by weight, the content of the carbonate additive is 0.1-2 parts by weight, and the content of the lithium salt additive is 0.1-2 parts by weight.
Preferably, based on 100 parts by weight of the electrolyte, the content of the fluoropropylene carbonate is 3-10 parts by weight, the content of the 1, 3-propane sultone is 2-5 parts by weight or the content of the 1, 3-propene sultone is 1-3 parts by weight, the content of the carbonate additive is 0.1-1 part by weight, and the content of the lithium salt type additive is 0.1-1 part by weight.
Optionally, the positive electrode protection additive comprises a nitrile additive comprising at least one of succinonitrile, adiponitrile, ethylene glycol bis (propionitrile) ether, and 1,3, 6-hexanetrinitrile.
Optionally, the nitrile additive is present in an amount of 0.1 to 8 parts by weight, preferably 2 to 6 parts by weight, based on 100 parts by weight of the electrolyte.
Optionally, the lithium salt comprises at least one of lithium hexafluorophosphate, lithium bis-fluorosulfonylimide, and lithium bis-trifluoromethylsulfonyl imide.
Optionally, the lithium salt is present in an amount of 1.0 to 1.5 mol/L.
Optionally, the organic solvent comprises at least one of a cyclic carbonate, a linear carbonate, and a linear carboxylate;
the cyclic carbonate comprises ethylene carbonate and/or propylene carbonate; the linear carbonate comprises diethyl carbonate; the linear carboxylic acid ester comprises propyl propionate and/or ethyl propionate.
The present disclosure further provides a lithium ion battery, which includes a housing, and an electric core and an electrolyte disposed in the housing, where the electrolyte is the electrolyte of the lithium ion battery described above.
Through the technical scheme, the lithium ion battery electrolyte disclosed by the invention contains the first negative electrode film forming additive and the second negative electrode film forming additive, and the second negative electrode film forming additive and the first negative electrode film forming additive are cooperated with each other, so that an SEI (solid electrolyte interphase) film which is good in compactness, good in elasticity and resistant to acid corrosion can be formed on the surface of a negative electrode, the degradation effect of an anode protection additive on the SEI film can be reduced, the high-temperature cycle performance of a high-voltage lithium ion battery can be improved, and meanwhile, the high-temperature storage performance requirement can be met.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Detailed Description
The following describes in detail specific embodiments of the present disclosure. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
A first aspect of the present disclosure provides a lithium ion battery electrolyte, which is a liquid containing a lithium salt, an organic solvent, and a positive electrode protection additive, and further contains a first negative electrode film-forming additive and a second negative electrode film-forming additive, where the first negative electrode film-forming additive includes propylene fluoro carbonate and 1, 3-propane sultone or 1, 3-propane sultone, and the second negative electrode film-forming additive includes a carbonate additive and a lithium salt type additive.
The lithium ion battery electrolyte provided by the disclosure contains a first negative electrode film-forming additive and a second negative electrode film-forming additive, the second negative electrode film-forming additive with a specific content and the first negative electrode film-forming additive cooperate with each other, so that an SEI film with good compactness, good elasticity and acid corrosion resistance can be formed on the surface of a negative electrode, the stability of the SEI film is better, the degradation effect of an anode protection additive on the SEI film can be reduced, and the high-temperature cycle performance of a high-voltage lithium ion battery can be improved.
According to the present disclosure, the kinds of the carbonate additive and the lithium salt type additive may be selected within a wide range, for example, the carbonate additive may include ethylene carbonate and/or propylene carbonate, and the lithium salt type additive may include lithium difluorooxalato borate and/or lithium dioxaoxalato borate.
According to the present disclosure, in order to further enhance the stability of the negative electrode SEI film formed on the surface of the negative electrode by the first negative electrode film-forming additive and the second negative electrode film-forming additive, it is preferable that the content of the propylene fluorocarbonate is 3 to 15 parts by weight, the content of the 1, 3-propane sultone is 2 to 6 parts by weight or the content of the 1, 3-propane sultone is 0.1 to 5 parts by weight, the content of the carbonate additive is 0.1 to 2 parts by weight, and the content of the lithium salt additive is 0.1 to 2 parts by weight, based on 100 parts by weight of the electrolyte.
The second negative electrode film-forming additive with proper content can ensure that the film is fully formed on the surface of the negative electrode and the first negative electrode film-forming additive to improve the stability of a negative electrode SEI film, and can be almost completely consumed in the formation process, so that the problem that the cycle performance of the battery is influenced by excessive second negative electrode film-forming additive remained in the formed electrolyte and oxidized to generate gas at the positive electrode is avoided.
According to the present disclosure, it is further preferable that the content of the fluoropropylene carbonate may be 3 to 10 parts by weight, the content of the 1, 3-propane sultone may be 2 to 5 parts by weight or the content of the 1, 3-propene sultone may be 1 to 3 parts by weight, the content of the carbonate additive may be 0.1 to 1 part by weight, and the content of the lithium salt type additive may be 0.1 to 1 part by weight, based on 100 parts by weight of the electrolyte. Under the condition of the optimal content, on one hand, the negative electrode SEI film formed by the first negative electrode film-forming additive and the second negative electrode film-forming additive has better compactness, better elasticity and better acid corrosion resistance, and can better reduce the deterioration effect of the positive electrode protective additive and the positive electrode by-product on the SEI film in the circulation process; on the other hand, the first negative electrode film forming additive cannot be completely consumed in the formation process, and part of the first negative electrode film forming additive is remained in the formed electrolyte, and when the negative electrode SEI film is damaged, the remaining first negative electrode film forming additive can repair the negative electrode SEI film; on the other hand, the second negative electrode film-forming additive and the first negative electrode film-forming additive can be fully formed into films, so that the stability of a negative electrode SEI film is remarkably improved, the second negative electrode SEI film can be completely consumed in the formation process, and the phenomenon that the redundant second negative electrode film-forming additive is remained in the formed electrolyte and is oxidized at the positive electrode to generate gas to influence the cycle performance of the battery is avoided.
According to the present disclosure, the kind of the positive electrode protection additive may be selected from a wide range, and preferably, in order to further enhance the protective effect of the positive electrode protection additive on the positive electrode and better avoid the oxidation of the electrolyte by the positive electrode, the positive electrode protection additive may include a nitrile additive, and the nitrile additive may include at least one of succinonitrile, adiponitrile, ethylene glycol bis (propionitrile) ether, and 1,3, 6-hexanetricarbonitrile.
According to the present disclosure, the relative content of the nitrile additive in the lithium ion battery electrolyte may vary within a wide range, for example, the content of the nitrile additive may be 0.1 to 8 parts by weight, preferably 2 to 6 parts by weight, based on 100 parts by weight of the electrolyte, and the nitrile additive within the preferred content range not only can better protect the positive electrode but also has less deterioration effect on the negative electrode SEI film.
According to the present disclosure, the kind of the lithium salt may vary within a wide range, and for example, the lithium salt may include at least one of lithium hexafluorophosphate, lithium bis-fluorosulfonylimide, and lithium bis-trifluoromethylsulfonyl imide.
According to the present disclosure, the content of the lithium salt in the lithium ion battery electrolyte may vary within a wide range, and preferably, in order to provide the lithium ion battery electrolyte with high lithium ion conductivity and improve the electrochemical performance of the lithium ion battery, the content of the lithium salt may be 1.0 to 1.5 mol/L.
According to the present disclosure, the kind of the organic solvent may be selected from a wide range, for example, the organic solvent may include at least one of cyclic carbonate, linear carbonate, and linear carboxylate; the cyclic carbonate may include ethylene carbonate and/or propylene carbonate; the linear carbonate comprises diethyl carbonate; the linear carboxylic acid ester comprises propyl propionate and/or ethyl propionate.
The preparation method of the lithium ion battery electrolyte disclosed by the invention has no special requirements, as long as all components of the lithium ion battery electrolyte are uniformly mixed, and the adding sequence and the mixing mode of all the components are not specially limited. For example, the organic solvent may be mixed uniformly, then the lithium salt may be added and mixed uniformly, and then the above-mentioned positive electrode protective additive, first negative electrode film-forming additive and second negative electrode film-forming additive may be added.
A second aspect of the present disclosure provides a lithium ion battery, which includes a casing, and an electric core and an electrolyte that are located in the casing, where the electrolyte is the lithium ion battery electrolyte described in any one of the above. The cell may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode. The positive electrode may include a positive electrode current collector and a positive electrode material, and the positive electrode material may include a positive electrode active material, a conductive agent, and a positive electrode binder, which may be a positive electrode active material, a conductive agent, and a positive electrode binder commonly used in the art. The negative electrode may include a negative electrode current collector and a negative electrode material, the negative electrode material may include a negative electrode active material and a negative electrode binder, the negative electrode material may further optionally include a conductive agent, which is a conventionally used conductive agent and may be the same as or different from the conductive agent in the positive electrode material layer, and the negative electrode active material and the negative electrode binder may be a negative electrode active material and a negative electrode binder commonly used in the art.
Preferably, the positive electrode active material may include at least one of spinel, a nickel-manganese positive electrode material having a layered structure, and a lithium iron phosphate-based positive electrode material, and preferably, the positive electrode active material is spinel; the negative active material may include at least one of a lithium negative electrode material, a graphite negative electrode material, and a silicon carbon negative electrode material, and preferably, the negative active material is metallic lithium.
The lithium ion battery of the present disclosure may be prepared by a method conventionally adopted by a person skilled in the art, for example, a separator layer is disposed between a positive electrode and a negative electrode to form a battery cell, then the battery cell is accommodated in a battery case, the lithium ion battery electrolyte of the present disclosure is injected, and then the battery case is sealed to obtain the lithium ion battery. The preparation method of the positive electrode comprises the steps of coating slurry containing a positive active material, a positive adhesive and a positive conductive agent on a positive current collector, drying, rolling and slicing to obtain the positive electrode. The drying is generally carried out at from 50 to 160 ℃ and preferably from 80 to 150 ℃. The preparation method of the negative electrode is similar to that of the positive electrode, and comprises the steps of coating slurry containing a negative electrode active material, a negative electrode binder and a negative electrode conductive agent selectively contained on a negative electrode current collector, and drying, rolling and slicing to obtain the negative electrode.
The present disclosure is further illustrated by the following examples, but is not to be construed as being limited thereby.
Example 1
Preparing an electrolyte:
in an argon glove box, cyclic carbonate (ethylene carbonate), linear carbonate (diethyl carbonate) and linear carboxylate (ethyl propionate) were mixed in the following ratio of 30: 20: 50 parts by weight of the organic solvent. The organic solvent was mixed with a lithium salt (lithium hexafluorophosphate) so that the concentration of the lithium salt was 1.1 mol/L. And then mixed with nitrile additives (succinonitrile and adiponitrile) so that the total content of the nitrile additives is 5 parts by weight based on 100 parts by weight of the electrolyte. And then mixed with propylene carbonate and 1, 3-propane sultone so that the content of the propylene carbonate is 5 parts by weight and the content of the 1, 3-propane sultone is 3 parts by weight based on 100 parts by weight of the electrolyte. And finally, a carbonate additive (ethylene carbonate) and a lithium salt type additive (lithium difluorooxalato borate) were mixed so that the content of the carbonate additive was 0.3 parts by weight and the content of the lithium salt type additive was 0.5 parts by weight based on 100 parts by weight of the electrolyte. Stirring until all solid matters are completely dissolved, and obtaining the lithium ion battery electrolyte of the embodiment.
Preparing a lithium ion battery:
mixing lithium cobaltate (LiCoO)2) Uniformly mixing acetylene black and polyvinylidene fluoride according to the weight ratio of 90:5:5, and pressing the mixture on an aluminum foil to obtain a positive plate; taking a graphite sheet as a negative plate; taking conventional PE or PP or composite diaphragm as ionsAn exchange membrane; the lithium ion battery electrolyte of the embodiment is adopted to prepare the lithium ion battery of the embodiment by a conventional method in the field.
Example 2
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 0.2 parts by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 0.2 parts by weight based on 100 parts by weight of the electrolyte.
Example 3
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 1 part by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 1 part by weight based on 100 parts by weight of the electrolyte.
Example 4
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 0.1 part by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 0.1 part by weight based on 100 parts by weight of the electrolyte.
Example 5
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 2 parts by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 2 parts by weight based on 100 parts by weight of the electrolyte.
Example 6
A lithium ion battery was prepared by the method of example 1, except that: the carbonate additive is propylene carbonate, and the lithium salt additive is lithium dioxalate borate.
Example 7
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 4 parts by weight and the content of the 1, 3-propane sultone was 2.5 parts by weight based on 100 parts by weight of the electrolyte.
Example 8
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 10 parts by weight and the content of the 1, 3-propane sultone was 5 parts by weight based on 100 parts by weight of the electrolyte.
Example 9
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 3 parts by weight and the content of the 1, 3-propane sultone was 2 parts by weight based on 100 parts by weight of the electrolyte.
Example 10
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 15 parts by weight and the content of the 1, 3-propane sultone was 6 parts by weight based on 100 parts by weight of the electrolyte.
Example 11
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 20 parts by weight and the content of the 1, 3-propane sultone was 1 part by weight based on 100 parts by weight of the electrolyte.
Example 12
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the fluoropropylene carbonate was 2 parts by weight and the content of the 1, 3-propane sultone was 8 parts by weight based on 100 parts by weight of the electrolyte.
Example 13
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 0.05 parts by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 2.5 parts by weight based on 100 parts by weight of the electrolyte.
Example 14
A lithium ion battery was prepared by the method of example 1, except that: in the electrolyte of this example, the content of the carbonate additive (ethylene carbonate) was 2.5 parts by weight and the content of the lithium salt type additive (lithium difluorooxalato borate) was 0.05 part by weight based on 100 parts by weight of the electrolyte.
Comparative example 1
A lithium ion battery was prepared by the method of example 1, except that: and no second negative film-forming additive is added in the electrolyte preparation process.
Comparative example 2
A lithium ion battery was prepared by the method of example 1, except that: and the carbonate additive in the second cathode film-forming additive is not added in the preparation process of the electrolyte.
Comparative example 3
A lithium ion battery was prepared by the method of example 1, except that: and the lithium salt additive in the second negative electrode film-forming additive is not added in the preparation process of the electrolyte.
Comparative example 4
A lithium ion battery was prepared by the method of example 1, except that: and the first negative electrode film-forming additive is not added in the electrolyte preparation process.
Test example
The lithium ion batteries prepared in examples 1 to 14 and comparative examples 1 to 4 were charged at a constant current and a constant voltage of 1C rate to 4.5V at normal temperature, the charge cutoff current was 0.02C, and then discharged at a constant current of 0.7C to 3.0V, and the first charge capacity and discharge capacity were recorded, and after repeating the charge and discharge cycles 100 times, 200 times, and 300 times in this way, the discharge capacities of the 100 th, 200 times, and 300 times were recorded and the capacity retention rate after the cycles was calculated, wherein the capacity retention rate after the n cycles (%) — the discharge capacity at the n th time/the first discharge capacity × 100%; the cut-off voltage was 4.5V. The test results are shown in table 1.
TABLE 1
As can be seen from table 1, since the lithium ion battery electrolyte of the present disclosure contains the first negative electrode film-forming additive and the second negative electrode film-forming additive, the cycle stability of the lithium ion battery assembled by using the first negative electrode film-forming additive and the second negative electrode film-forming additive is significantly enhanced, and particularly, when 100 parts by weight of the electrolyte contains 3 to 10 parts by weight of fluorinated propylene carbonate, 2 to 5 parts by weight of 1, 3-propane sultone, 0.1 to 1 part by weight of a carbonate additive, and 0.1 to 1 part by weight of a lithium salt type additive, the lithium ion battery electrolyte of the present disclosure has a more significant effect of improving the cycle stability of the lithium ion battery.
The preferred embodiments of the present disclosure have been described in detail above, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. The electrolyte of the lithium ion battery is a liquid containing lithium salt, an organic solvent and a positive electrode protection additive, and is characterized by also comprising a first negative electrode film forming additive and a second negative electrode film forming additive, wherein the first negative electrode film forming additive comprises propylene fluoro carbonate and 1, 3-propane sultone or 1, 3-propane sultone, and the second negative electrode film forming additive comprises a carbonate additive and a lithium salt type additive.
2. The lithium ion battery electrolyte of claim 1, wherein the carbonate additive comprises ethylene carbonate and/or propylene carbonate and the lithium salt type additive comprises lithium difluorooxalato borate and/or lithium bis-oxalato borate.
3. The electrolyte for lithium ion batteries according to claim 1, wherein the amount of the propylene fluorocarbonate is 3 to 15 parts by weight, the amount of the 1, 3-propane sultone is 2 to 6 parts by weight, or the amount of the 1, 3-propane sultone is 0.1 to 5 parts by weight, the amount of the carbonate additive is 0.1 to 2 parts by weight, and the amount of the lithium salt type additive is 0.1 to 2 parts by weight, based on 100 parts by weight of the electrolyte.
4. The electrolyte for lithium ion batteries according to claim 3, wherein the amount of the propylene fluorocarbonate is 3 to 10 parts by weight, the amount of the 1, 3-propane sultone is 2 to 5 parts by weight, or the amount of the 1, 3-propane sultone is 1 to 3 parts by weight, the amount of the carbonate additive is 0.1 to 1 part by weight, and the amount of the lithium salt type additive is 0.1 to 1 part by weight, based on 100 parts by weight of the electrolyte.
5. The lithium ion battery electrolyte of any of claims 1-4, wherein the positive electrode protection additive comprises a nitrile additive comprising at least one of succinonitrile, adiponitrile, ethylene glycol bis (propionitrile) ether, and 1,3, 6-hexanetrinitrile.
6. The lithium ion battery electrolyte of claim 5 wherein the nitrile additive is present in an amount of from 0.1 to 8 parts by weight, based on 100 parts by weight of the electrolyte; preferably 2 to 6 parts by weight.
7. The lithium ion battery electrolyte of any of claims 1-4, wherein the lithium salt comprises at least one of lithium hexafluorophosphate, lithium bis-fluorosulfonylimide, and lithium bis-trifluoromethylsulfonyl imide.
8. The lithium ion battery electrolyte of claim 7, wherein the lithium salt is present in an amount of 1.0 to 1.5 mol/L.
9. The lithium ion battery electrolyte of any of claims 1-4, wherein the organic solvent comprises at least one of a cyclic carbonate, a linear carbonate, and a linear carboxylate;
the cyclic carbonate comprises ethylene carbonate and/or propylene carbonate; the linear carbonate comprises diethyl carbonate; the linear carboxylic acid ester comprises propyl propionate and/or ethyl propionate.
10. A lithium ion battery, comprising a casing, and a battery core and an electrolyte in the casing, wherein the electrolyte is the lithium ion battery electrolyte according to any one of claims 1 to 9.
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Cited By (2)
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|---|---|---|---|---|
| CN113471539A (en) * | 2021-06-29 | 2021-10-01 | 惠州市赛能电池有限公司 | Electrolyte, preparation method thereof and lithium ion battery |
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