CN101740822A - Electrolyte and lithium ion battery containing same - Google Patents
Electrolyte and lithium ion battery containing same Download PDFInfo
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- CN101740822A CN101740822A CN200810203220A CN200810203220A CN101740822A CN 101740822 A CN101740822 A CN 101740822A CN 200810203220 A CN200810203220 A CN 200810203220A CN 200810203220 A CN200810203220 A CN 200810203220A CN 101740822 A CN101740822 A CN 101740822A
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Abstract
The invention provides electrolyte of a lithium ion battery and the lithium ion battery containing the same. The electrolyte comprises a solvent, electrolyte lithium salt and is characterized by comprising a carbonic ester compound and a compound A, as well as an additive compound B; the compound A is a chain carboxylic ester and has a following general formula in specifications, wherein R1 is straight-chain paraffin with a general formula CnH2n+1, wherein n is not less 1 and is an integer; and R2 is the straight-chain paraffin with a general formula CmH2m+1, wherein m is more than 1 and is an integer; and the compound B is a sulfurous ester and has the following general formula in specifications, wherein R3 is paraffin with a general formula CxH2x, wherein x is more than 1 and less than 4 and is an integer; and R4 and R5 is the paraffin with a general formula CyH2y-1, wherein y is more than 0 and less than 4 and is an integer. The low-temperature property of the battery prepared by the electrolyte is effectively improved.
Description
Technical field
The present invention relates to a kind of lithium-ion battery electrolytes, and the lithium ion battery that has used this electrolyte.
Background technology
Lithium ion battery is owing to have the energy density height, have extended cycle life, the open circuit voltage height, series of advantages such as safety non-pollution, be widely used in the electronic products such as numerous portable communications such as mobile phone, notebook computer, digital camera, video camera, PDA, MP3, Bluetooth, PMP, amusement, and expanded range of application to fields such as electric bicycle, electric automobiles gradually.
Along with the lithium ion battery marketization deepens continuously, people are more and more higher to the expectation of battery performance.The commercialization lithium ion battery has been difficult to satisfy the needs such as key areas such as electric motor car, space technology and military affairs at present, it is not good that one of the main reasons is exactly the performance of battery under high and low temperature, and therefore widening operating temperature range has become the emphasis problem that Study on Li-ion batteries using person pays close attention to.Start with by electrolyte and to improve temperature performance and be proved to be feasible technological approaches, this is because as playing the ion conductor of conduction in battery, the performance of electrolyte and influence the battery temperature performance to a great extent with state of interface that both positive and negative polarity forms.
The viscosity of electrolyte increases under the low temperature, and conductivity descends, and the reduction of negative terminal surface SEI film filming performance etc. all causes under the cryogenic conditions of battery discharge capacity and cycle performance not as people's will.
Summary of the invention
The technical problem that the present invention solves is the defective of discharge capacity and cycle performance difference under the lithium ion battery cryogenic conditions in the prior art, and a kind of novel electrolyte that can improve discharge capacity and cycle performance under the lithium ion battery cryogenic conditions is provided.
Another object of the present invention provides a kind of lithium ion battery, and described lithium ion battery uses electrolyte of the present invention.
The invention provides a kind of lithium-ion battery electrolytes, comprise solvent, electrolyte lithium salt, wherein, described solvent comprises carbonate products and compd A, and described electrolyte also comprises additive compound B,
Described compd A is the chain carboxylate, has following general formula:
R
1Be that general formula is C
nH
2n+1Linear paraffin, n 〉=1 and be integer wherein; R
2Be that general formula is C
mH
2m+1Linear paraffin, m＞1 and be integer wherein;
Described compd B is a sulfite, has following general formula:
R
3Be that general formula is C
xH
2xAlkane, 1＜x＜4 and be integer wherein, R
4, R
5Be that general formula is C
yH
2y + 1Alkane, 0＜n＜4 and be integer wherein.
The present invention provides a kind of lithium ion battery in addition, comprises housing, places the electric core and the electrolyte that are formed by positive pole, barrier film, negative pole in the housing, and wherein, the electrolyte of described lithium ion battery is electrolyte provided by the invention.
Added solvent chain carboxylate and additive sulfite compounds in the lithium-ion battery electrolytes provided by the invention, the low temperature limits of electrolyte is reduced, discharge capacity and cycle performance have obtained effective improvement under the cryogenic conditions.
When lithium ion battery used at low temperatures, when reaching the low temperature limits of electrolyte, electrolyte might solidify or component is separated out, and electrolyte viscosity increases, and ionic conductivity descends rapidly, causes the rapid deterioration of battery performance.Therefore when the cryogenic property of battery is improved in the electrolyte aspect, need to consider that the low temperature that reduces electrolyte uses lower limit.
The inventor finds through long-term a large amount of experiments, because the chain carboxylate has very low solidifying point, low 20～30 ℃ of the solidifying point average specific carbonic ester of these ester classes, and viscosity is less, the low temperature that helps to reduce electrolyte system uses lower limit, adds the cryogenic property that an amount of chain carboxylate can improve lithium ion battery.But because their polarity is strong, easily react, thereby interpolation chain carboxylate is during as the electrolyte solvent composition cycle efficieny variation of lithium ion battery with Li.And under cryogenic conditions, the negative terminal surface SEI film of battery forms not fine and close, has Li dendrite to generate in the charge and discharge process easily, causes the cycle performance variation, and the increase of irreversible capacity.And in electrolyte, add sulfite as additive, can improve the negative terminal surface filming performance under the cryogenic conditions, thereby improve the cycle performance of battery.Therefore, electrolyte provided by the invention makes that discharge capacity and cycle performance have obtained effective improvement under the cryogenic conditions of lithium ion battery.
Description of drawings
Fig. 1 is for adopting the cycle performance test result schematic diagram of lithium ion battery under-20 ℃ of conditions of electrolyte preparation of the present invention.
Fig. 2 is for adopting the cycle performance test result schematic diagram of lithium ion battery under-30 ℃ of conditions of electrolyte preparation of the present invention.
Specific embodiments
The invention provides a kind of lithium-ion battery electrolytes, comprise solvent, electrolyte lithium salt, wherein, described solvent comprises carbonate products and compd A, and described electrolyte also comprises additive compound B,
Described compd A is the chain carboxylate, has following general formula:
R
1Be that general formula is C
nH
2n+1Linear paraffin, n 〉=1 and be integer wherein; R
2Be that general formula is C
mH
2m+1Linear paraffin, m＞1 and be integer wherein;
Described compd B is a sulfite, has following general formula:
R
3Be that general formula is C
xH
2xAlkane, 1＜x＜4 and be integer wherein, R
4, R
5Be that general formula is C
yH
2y + 1Alkane, 0＜n＜4 and be integer wherein.
Described sulfite is a kind of in ethylene sulfite (ES), sulfurous acid dimethyl esters (DMS), propylene sulfite (PS) or more than one preferably.
Described additive preferably also comprises Compound C, and Compound C has following general formula:
R
6Be that general formula is C
zH
2z+1Linear paraffin, 0≤z≤3 and be integer wherein.Described Compound C is preferably vinylene carbonate (VC).VC is good film for additive, and the SEI film that the battery first charge-discharge is formed is stable fine and close, and can reduce irreversible capacity first, many-sided performances such as the circulation of raising battery, low temperature.Described Compound C accounts for 0.1～15wt% of electrolyte solvent gross mass.
The chain carboxylate of described compd A is selected from methyl formate (HCOOCH
3), Ethyl formate (HCOOC
2H
5), methyl acetate [CH
3COOCH
3], ethyl acetate [CH
3COOC
2H
5], methyl propionate [C
2H
5COOCH
3], n-propyl acetate [CH
3COOCH
2CH
2CH
3], isopropyl acetate [CH
3COOCH (CH
3) CH
3], ethyl propionate [C
2H
5COOC
2H
5], methyl butyl [CH
3CH
2CH
2COOCH
3] and methyl butyrate [CH
3(CH
3) COOCH
3] a kind of in waiting or more than one.
Described compd A accounts for 8～60wt% of electrolyte solvent gross mass, preferred 10～40wt%; Described compd B accounts for 1.0～10wt% of electrolyte solvent gross mass, preferred 1.0～5wt%.
Described carbonate products is selected from least two kinds in ethylene carbonate (EC), propene carbonate (PC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), dimethyl carbonate (DMC), butylene (BC), the methyl-propyl carbonic ester carbonic esters such as (MPC).
Described electrolyte lithium salt is selected from lithium perchlorate (LiClO
4), LiBF4 (LiBF
4), lithium hexafluoro phosphate (LiPF
6), lithium carbonate (Li
2CO
3), lithium sulfate (Li
2SO
4), lithium sulfite (Li
2SO
3), lithium nitrate (LiNO
3) in one or more.
Lithium ion battery provided by the invention comprises housing, and by electric core and electrolyte that the barrier film between the positive pole that places housing and negative pole and the described electrode forms, electrolyte uses electrolyte of the present invention.The present invention has no particular limits described barrier film, can be selected from various barrier film known in those skilled in the art.For example, described barrier film can be selected from various barrier films with electrical insulation capability and liquid retainability energy used in the lithium ion battery, as polyolefin micro porous polyolefin membrane, polyethylene felt, glass mat or ultra-fine fibre glass paper.The position of described barrier film, character and kind are conventionally known to one of skill in the art.
The positive pole of described lithium ion battery comprises positive active material, conductive agent and adhesive, wherein positive electrode is selected from positive active materials known in those skilled in the art such as cobalt acid lithium, lithium nickelate, LiMn2O4, LiFePO4 and ternary material, the kind of described conductive agent and content are conventionally known to one of skill in the art, and conductive agent can be selected from one or more in carbon nano-tube, nano-silver powder, acetylene black, graphite powder, the carbon black as described.With respect to the positive active material of 100 weight portions, the content of described conductive agent can be the 0.1-10 weight portion.The kind of described adhesive and consumption are conventionally known to one of skill in the art, and adhesive can be selected from one or more in polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), carboxymethyl cellulose (CMC), methylcellulose (MC), the butadiene-styrene latex (SBR) etc. as described.With respect to the positive active material of 100 weight portions, the content of described adhesive can be the 0.1-5 weight portion.
Contain conductive agent and adhesive in the lithium ion battery negative provided by the invention, wherein, the kind of described conductive agent and adhesive and consumption are conventionally known to one of skill in the art, and described conductive agent can be selected from a kind of in graphite powder, carbon nano-tube, nano-silver powder, acetylene black, the carbon black; Described adhesive can be selected from one or more in polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), carboxymethyl cellulose (CMC), methylcellulose (MC), the butadiene-styrene latex (SBR) etc.
The negative plate of described lithium ion battery can be by at first mixing solvent with conductive agent, adhesive, in de-airing mixer, stir then and form cathode size stable, homogeneous, and slurry is coated on the collector equably, the method for carrying out drying, rolling and cut-parts again makes.Described solvent types and consumption are conventionally known to one of skill in the art, and solvent can be selected from as N-methyl pyrrolidone (NMP), water etc. and can make described mixture form any solvent of pasty state as described.Described collector can be the various collectors that this area routine is used for lithium ion battery negative, a kind of as in Copper Foil, aluminium foil and the aluminium net.Drying, roll-in and concrete operations that cut and condition can adopt preparation method and condition according to positive pole to be prepared.
Can by with positive plate, negative plate and barrier film successively with the stacked electrode group that is wound into scroll of up-coiler, and the electrode group that obtains put into the battery case of an end opening, the method for injecting electrolyte, sealing then makes described lithium ion battery.Wherein method provided by the invention is adopted in the preparation of positive plate and negative plate; Wherein the method for the stacked coiling of up-coiler, electrolyte injection rate and method for implanting and sealing adopts prior art.
In the specific embodiments of the invention, carbonate products is selected three kinds of ethylene carbonates (EC), divinyl carbonate (DEC), methyl ethyl carbonate (EMC), and the mass ratio of three kinds of solvents is EC: DEC: EMC=1: 1: 1.
In the specific embodiment of the invention, described electrolyte lithium salt is selected LiPF
6, the concentration of lithium salts is in 0.7～1.3mol/L scope, still for convenience of elaboration of the present invention, fixedly lithium salts LiPF
6Final and organic solvent is mixed with the solution of 1.0mol/L.
Embodiment 1
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
(1) preparation of electrolyte
To 100g EC, DEC, EMC and ethyl propionate (EP) (the gloomy Hao in Shanghai Fine Chemical Co., Ltd analyzes pure) proportioning is 1: 1: 1: the LiPF that adds 14.98g in 1 solution
6, add additive ethylene sulfite (ES) (the gloomy Hao in Shanghai Fine Chemical Co., Ltd analyzes pure) 3g again and mix evenly, make experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that the mass percent that accounts for electrolyte solvent of compd E P is 25%, additive ES accounts for electrolyte solvent is 3%.
(2) Zheng Ji preparation
(Atuofeina Corp 761#PVDF) is dissolved in 1350 gram N-N-methyl-2-2-pyrrolidone N-(NMP) solvents and makes binder solution, then with 2895 gram LiCoO with 90 gram polyvinylidene fluoride
2(FMC Corp.'s production) joins in the above-mentioned solution, fully mixes and makes anode sizing agent, and this anode sizing agent is coated on the aluminium foil equably, makes long 70 millimeters, wide 19 millimeters, thick 125 microns positive pole through 125 ℃ of oven dry 1 hour, roll-in, cut-parts.The amount that applies makes every positive pole contain 6.2 gram LiCoO
2
(3) preparation of negative pole
(Jiangmen quantum Gao Ke company produces with 30 gram CMC CMC, model is CMC1500) and 75 gram butadiene-styrene rubber (SBR) latex (Nantong Shen Hua chemical company commodity, the trade mark is TAIPOL1500E) be dissolved in the 1875 gram water, make binder solution, with 1395 gram graphite (SODIFF company commodity, the trade mark is DAG84) join in this binder solution, mix and make the graphite cathode slurry, this cathode size is coated on the Copper Foil equably, through 125 ℃ of oven dry 1 hour, roll-in, cut-parts make long 70 millimeters, wide 19 millimeters, thick 125 microns negative pole.The amount that applies makes every negative pole contain 3.1 gram graphite.
(4) assembling of battery
The positive plate that (2) are obtained, negative plate and the PP/PE/PP barrier film that (3) obtain stack gradually the electrode group that is wound into scroll, the electrode group that obtains is put into the battery case of an end opening, inject (1) preparation electrolyte 3 grams, make LP053450AR lithium ion battery A1 after the sealing.The design capacity of battery is 1C=1100mAh.
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and EP proportioning is 1: 1: 1: the LiPF that adds 15.49g in 1 solution
6, add additive ES1g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that EP accounts for electrolyte solvent is 25%, and the mass percent that additive ES accounts for electrolyte solvent is 1%, VC is 3%.
The LP053450AR lithium ion battery A2 that finally makes.
Embodiment 3
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and ethyl acetate (EA) proportioning is 1: 1: 1: the LiPF that adds 15.19g in 0.26 solution
6, add additive ES (the gloomy Hao in Shanghai Fine Chemical Co., Ltd analyzes pure) 3g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that compd E A accounts for electrolyte solvent is 8%, and the mass percent that accounts for electrolyte solvent of additive ES is 3%, VC is 3%.
The LP053450AR lithium ion battery A3 that finally makes.
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and EP proportioning is 1: 1: 1: the LiPF that adds 15.24g in 0.33 solution
6, add additive DMS (the gloomy Hao in Shanghai Fine Chemical Co., Ltd analyzes pure) 3g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that EP accounts for electrolyte solvent is 10%, and the mass percent that accounts for electrolyte solvent of additive DMS is 3%, VC is 3%.
The LP053450AR lithium ion battery A4 that finally makes.
Embodiment 5
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and methyl acetate (MA) (the gloomy Hao in Shanghai Fine Chemical Co., Ltd analyzes pure) proportioning is 1: 1: 1: the LiPF that adds 16.14g in 2 solution
6, add additive PS5g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that accounts for electrolyte solvent of MA is 40%, and the mass percent that additive PS accounts for electrolyte solvent is 5%, VC is 3%.
The LP053450AR lithium ion battery A5 that finally makes.
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and EP proportioning is 1: 1: 1: the LiPF that adds 16.24g in 4.14 the solution
6, add additive ES5g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that the mass percent that accounts for electrolyte solvent of EP is 58%, additive ES accounts for electrolyte solvent is 5%, VC is 3%.
The LP053450AR lithium ion battery A6 that finally makes.
Embodiment 7
This embodiment is used to illustrate lithium-ion battery electrolytes provided by the invention and lithium ion battery thereof.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and EP proportioning is 1: 1: 1: the LiPF that adds 16.63g in 1.29 solution
6, add additive ES10g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that accounts for electrolyte solvent of EP is 30%, and the mass percent that accounts for electrolyte solvent of additive ES is 10%, VC is 3%.
The LP053450AR lithium ion battery A7 that finally makes.
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC and EMC proportioning is 1: 1: 1: the LiPF that adds 17.14g in 7 solution
6, add additive ES3g again, and VC3g is evenly mixed, makes experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that accounts for electrolyte solvent of EP is 70%, and the mass percent that accounts for the electrode solution solvent of additive ES is 3%, VC is 3%.
The battery LP053450AR that note is made is A8.
Comparative example 1
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC and EMC proportioning is in solution to add the LiPF of 14.58g at 1: 1: 1
6, add additive VC3g again and mix evenly, make experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that additive VC accounts for electrolyte solvent is 3%.
The battery LP053450AR that note is made is B1.
Comparative example 2
Method according to embodiment 1 prepares lithium ion battery, the difference is that the preparation of electrolyte.
To 100g EC, DEC, EMC and EP proportioning is 1: 1: 1: the LiPF that adds 15.38g in 1 solution
6, add additive VC3g again and mix evenly, make experiment electrolyte.
In this nonaqueous electrolytic solution, the mass percent that accounts for electrolyte solvent of EP is 25%, and the mass percent that additive VC accounts for electrolyte solvent is 3%.
The battery LP053450AR that note is made is B2.
Each embodiment and comparative example compd A and components of additives and content are as shown in table 1.
Table 1 compd A and additive component and content
The test of battery cryogenic property
The battery B1-B2 that battery A1-A8 that the foregoing description 1-8 is made and comparative example 1-2 make, the nominal capacity of battery is 1100mA, is shelved in the climatic chamber, and the control temperature be-20 ℃ (second group of test is-30 ℃), and the time of shelving is 180min.Charging to voltage with 550mA (0.5C multiplying power) is 4.2V, constant voltage 4.2V charging again, and cut-off current 55mA (0.05C), and to be discharged to voltage with 550mA (0.5C) be that 2.75V ends, and writes down discharge capacity first.Carry out charge and discharge cycles again 10 times, record cycle charge discharge capacitance.Then battery is shelved 24h in normal temperature, under normal temperature (25 ℃), carry out charge and discharge cycles 3 times, record cycle charge discharge capacitance with the 0.5C multiplying power.
Test result and analysis
Obtain following test result according to above-mentioned method of testing.
(1) in climatic chamber, under the temperature-20 ℃ condition, the result of discharge capacity first such as the table 2 of battery.Carry out the result such as the table 3 of loop test again, and Figure of description 1.
The result of discharge capacity first of 2-20 ℃ of battery of table
| The battery numbering | Low temperature-20 is discharge capacity (mAh/g) ℃ first |
| ??A1 | ??991 |
| ??A2 | ??1000 |
| ??A3 | ??970 |
| ??A4 | ??975 |
| ??A5 | ??1002 |
| ??A6 | ??950 |
| ??A7 | ??941 |
| ??A8 | ??801 |
| ??B1 | ??750 |
| ??B2 | ??999 |
Table 3 cycle performance test result (bodge: mAh/g)
According to the data in the above table 2, under-20 ℃ of conditions, the low temperature discharge capacity that the chain carboxylate obviously can improve battery is added in the contrast of discharge capacity first of the battery A1 of embodiment 1 preparation and the battery B2 of Comparative Examples as can be seen.
In addition according to the data and the Figure of description 1 of table 3, under-20 ℃ of conditions, the cycle performance of 2-10 the charge/discharge capacity of the battery A1-7 of embodiment 1-7 preparation is significantly better than battery B 1, the B2 of Comparative Examples, circulation volume descends less than 90mAh among the embodiment, and the circulation volume 150～300mAh that descended in the Comparative Examples, and the battery recovery capacity in the Comparative Examples will be starkly lower than embodiment.Therefore the chain carboxylate is added in explanation in electrolyte, adds the cycle performance that sulfite can obviously improve battery again.
(2) in climatic chamber, under the temperature-30 ℃ condition, the result of discharge capacity first such as the table 4 of battery.Carry out the result such as the table 5 of loop test again, and Figure of description 2.
The result of discharge capacity first of 4-30 ℃ of battery of table
| The battery numbering | Low temperature-30 is discharge capacity (mAh/g) ℃ first |
| ??A1 | ??789 |
| ??A2 | ??802 |
| ??A3 | ??708 |
| ??A4 | ??735 |
| ??A5 | ??810 |
| ??A6 | ??791 |
| ??A7 | ??751 |
| ??A8 | ??692 |
| ??B1 | ??391 |
| ??B2 | ??795 |
Table 5 cycle performance test result (bodge: mAh/g)
According to the data in the above table 4, under-30 ℃ of conditions, the low temperature discharge capacity that the chain carboxylate obviously can improve battery is added in the contrast of discharge capacity first of the battery A1 of embodiment 1 preparation and the battery B2 of Comparative Examples as can be seen.
In addition according to the data and the Figure of description 1 of table 5, under-30 ℃ of conditions, the cycle performance of 2-10 the charge/discharge capacity of the battery A1-7 of embodiment 1-7 preparation is significantly better than battery B1, the B2 of Comparative Examples, battery capacity descends less than 350mAh among the embodiment 1-7, the recovery capacity is higher than 920mAh, and the battery capacity in the Comparative Examples descends between 350mAh～750mAh, and the recovery capacity is at 700mAh～800mAh.Therefore the chain carboxylate is added in explanation in electrolyte, adds the cycle performance that sulfite can obviously improve battery again.
In a word, from the test result of above embodiment and comparative example, use the low temperature discharge capacity of lithium ion battery of electrolyte provided by the invention preparation and cycle performance to effectively improve as can be seen and improve.
Claims (13)
1. a lithium-ion battery electrolytes comprises solvent, electrolyte lithium salt, it is characterized in that, described solvent comprises carbonate products and compd A, and described electrolyte also comprises additive compound B,
Described compd A is the chain carboxylate, has following general formula:
R
1Be that general formula is C
nH
2n+1Linear paraffin, n 〉=1 and be integer wherein; R
2Be that general formula is C
mH
2m+1Linear paraffin, m＞1 and be integer wherein;
Described compd B is a sulfite, has following general formula:
R
3Be that general formula is C
xH
2xAlkane, 1＜x＜4 and be integer wherein, R
4, R
5Be that general formula is C
yH
2y + 1Alkane, 0＜y＜4 and be integer wherein.
2. lithium-ion battery electrolytes according to claim 1, wherein, described sulfite is selected from one or several in ethylene sulfite, sulfurous acid dimethyl esters, the propylene sulfite.
3. lithium-ion battery electrolytes according to claim 1, wherein, described electrolyte also comprises additive compound C, described Compound C has following general formula:
R
6Be that general formula is C
zH
2z+1Linear paraffin, 0≤z≤3 and be integer wherein.
4. the lithium-ion battery electrolytes of stating according to claim 3, wherein, described Compound C is a vinylene carbonate.
5. lithium-ion battery electrolytes according to claim 3, wherein, described Compound C accounts for 0.1～15wt% of electrolyte solvent gross mass.
6. lithium-ion battery electrolytes according to claim 1, wherein, the chain carboxylate of described compd A is selected from a kind of in methyl formate, Ethyl formate, methyl acetate, ethyl acetate, methyl propionate, n-propyl acetate, isopropyl acetate, ethyl propionate, methyl butyl and the methyl butyrate or more than one.
7. lithium-ion battery electrolytes according to claim 1, wherein, described carbonate products is selected from ethylene carbonate, propene carbonate, diethyl carbonate, dimethyl carbonate, Methylethyl carbonic ester, butylene, the methyl-propyl carbonic ester at least two kinds.
8. lithium-ion battery electrolytes according to claim 1, wherein, described compd A accounts for 8～60wt% of electrolyte solvent gross mass.
9. lithium-ion battery electrolytes according to claim 8, wherein, described compd A accounts for 10～40wt% of electrolyte solvent gross mass.
10. lithium-ion battery electrolytes according to claim 1, wherein, described compd B accounts for 1.0～10wt% of electrolyte solvent gross mass.
11. lithium-ion battery electrolytes according to claim 10, wherein, described compd B accounts for 1.0～5wt% of electrolyte solvent gross mass.
12. lithium-ion battery electrolytes according to claim 1, wherein, described electrolyte lithium salt is selected from one or more in lithium perchlorate, LiBF4, biethyl diacid lithium borate, lithium hexafluoro phosphate, lithium carbonate, lithium sulfate, lithium sulfite, the lithium nitrate.
13. a lithium ion battery comprises housing, places the electric core and the electrolyte that are formed by positive pole, barrier film, negative pole in the housing, it is characterized in that the electrolyte of described lithium ion battery is any described electrolyte of claim 1-12.
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| CN103078141A (en) * | 2013-01-25 | 2013-05-01 | 宁德新能源科技有限公司 | Lithium-ion secondary battery and electrolyte thereof |
| CN103219544A (en) * | 2013-04-10 | 2013-07-24 | 山东威高东生新能源科技有限公司 | Low-temperature electrolyte for ternary power lithium ion battery and preparation method |
| CN103985905A (en) * | 2014-05-30 | 2014-08-13 | 厦门大学 | Electrolyte adopting propylene carbonate as main solvent |
| CN105489933A (en) * | 2014-09-16 | 2016-04-13 | 惠州Tcl金能电池有限公司 | Lithium ion battery electrolyte and preparation method thereof, and lithium ion battery |
| EP3349288A1 (en) * | 2017-01-13 | 2018-07-18 | Toyota Jidosha Kabushiki Kaisha | Non-aqueous electrolyte secondary battery |
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