CN105098235A - Lithium ion secondary battery and electrolyte thereof - Google Patents
Lithium ion secondary battery and electrolyte thereof Download PDFInfo
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- CN105098235A CN105098235A CN201410151079.8A CN201410151079A CN105098235A CN 105098235 A CN105098235 A CN 105098235A CN 201410151079 A CN201410151079 A CN 201410151079A CN 105098235 A CN105098235 A CN 105098235A
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Abstract
The present invention discloses a lithium ion secondary battery and an electrolyte thereof. The electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, wherein the additive comprises one or two selected from vinylene carbonate and fluoroethylene carbonate, and further comprises benzoquinone represented by a formula I and/or a formula II and a derivative thereof, wherein R1, R2, R3 and R4 in the formula I and the formula II are respectively and independently selected from a hydrogen atom, a fluorine atom, and C1-C6 alkane. Compared with the lithium ion secondary battery electrolyte in the prior art, the lithium ion secondary battery electrolyte of the present invention has the following characteristics that the benzoquinone and the fluorinated and hydrocarbonyl derivative thereof are added on the basis of the traditional additives such as VC and/or FEC, such that a layer of the SEI film with characteristics of stability, compactness and high conductivity is generated on the lithium ion secondary battery negative electrode active material surface so as to effectively improve the problems of internal resistance increasing, capacity attenuation and the like after long term storage and cycle of the lithium ion secondary battery. The formulas I and II are defined in the specification.
Description
Technical field
The invention belongs to field of lithium ion secondary, more particularly, the present invention relates to a kind of can the lithium rechargeable battery of longer-term storage and circulation and electrolyte thereof.
Background technology
Lithium rechargeable battery has that energy density is high, operating voltage is high, self-discharge rate is low, has extended cycle life, unique advantage such as pollution-free, is therefore widely used in the electronic product such as camera, mobile phone as power supply.In recent years, along with the development of portable electronic products, the demand of people to high reliability, high-performance, long-life batteries increases day by day.
Organic electrolyte is the important component part of existing lithium rechargeable battery, and the main performance index such as its fail safe on battery, discharge capacity, high rate performance, operating temperature range, memory time and useful life have to be affected gravely.Research finds, in the initial charge process of lithium rechargeable battery, some active component contained by electrolyte at anode material interface, electrochemical reaction can occur, and generates the SEI film that one deck is very thin; This layer of SEI film has good lithium ion conductivity, can effectively stop solvent embedding altogether, prevents bath composition from decomposing at anode reduction and causing battery flatulence and electrolyte consumption.Therefore, form the SEI film stable fine and close, ionic conductivity is high at electrolyte/electrode interface to have become and solve lithium rechargeable battery longer-term storage flatulence and the too fast effective ways of Capacity fading.
Film for additive conventional in current electrolysis liquid comprises vinylene carbonate, vinyl ethylene carbonate, fluorinated ethylene carbonate, 1,3-N-morpholinopropanesulfonic acid lactones etc., these additives can form more stable SEI film and effectively improve storage and the cycle performance of lithium rechargeable battery.But, use the lithium rechargeable battery of above-mentioned film for additive after long storage and circulation, particularly high temperature storage and circulation, there will be internal resistance increase and capacity deep fades, and finally cause battery failure.
In view of this, necessary searching is a kind of can form the electrolysis additive of more stable SEI film and use the lithium rechargeable battery of this electrolyte.
Summary of the invention
The object of the invention is to: providing a kind of can form the stable fine and close and electrolyte of the SEI film that conductivity is high at anode surface and use the lithium rechargeable battery of this electrolyte, to improve longer-term storage and the cycle performance of lithium rechargeable battery.
In order to realize foregoing invention object, inventor is through concentrating on studies, find the benzoquinones shown in formula I, formula II and derivative thereof to combinationally use as one or both in electrolysis additive and vinylene carbonate (VC) and fluorinated ethylene carbonate (FEC), the more stable SEI film of character can be generated at surface of positive electrode active material.Accordingly, the invention provides a kind of electrolyte of lithium-ion secondary battery, comprise lithium salts, non-aqueous organic solvent and additive; Described additive comprise in vinylene carbonate, fluorinated ethylene carbonate one or both, also comprise formula I and/or the benzoquinones shown in formula II and derivative thereof,
Wherein, R1, R2, R3, R4 in formula I and formula II are selected from hydrogen atom independently of one another, fluorine atom, carbon number are the alkyl of 1-6.
Compared with prior art, two carbonyls and two double bonds are contained in formula I, the benzoquinones shown in formula II and fluoro thereof and alkyl derivative, can dissolve each other with the organic principle of electrolyte, therefore its parameter influence such as the viscosity to electrolyte, conductivity is very little, is the lithium rechargeable battery graphite anode SEI film film for additive that a class is excellent; On the other hand, by adding benzoquinones and fluoro thereof and alkyl derivative on the basis of conventional additive VC and/or FEC, make negative electrode of lithium ionic secondary battery generate one deck on the surface and more stablize the SEI film fine and close, conductivity is higher, thus effectively improve lithium rechargeable battery in longer-term storage and the problem such as the internal resistance increase caused after circulating and capacity attenuation.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, and described benzoquinones and derivative thereof mass fraction is in the electrolytic solution less than 10%.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, described benzoquinones and derivative thereof are preferably 1,4-benzoquinone (Benzoquinone I), adjacent benzoquinones (Benzoquinone II), fluoro 1,4-benzoquinone (Benzoquinone III), methyl-p-benzoquinone (Benzoquinone IV), 6-methyl-2-fluoro 1,4-benzoquinone (Benzoquinone V), perfluoro 1,4-benzoquinone (Benzoquinone VI), the adjacent benzoquinones (Benzoquinone VII) of perfluoro, and its structural formula is respectively:
One as electrolyte of lithium-ion secondary battery of the present invention is improved, described vinylene carbonate mass fraction is in the electrolytic solution 0.1%-5%, fluorinated ethylene carbonate mass fraction is in the electrolytic solution 0.1%-7%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, and described vinylene carbonate mass fraction is in the electrolytic solution 0.1%-5%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, and described fluorinated ethylene carbonate mass fraction is in the electrolytic solution 0.1%-7%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
Benzoquinones and derivative thereof mass fraction is in the electrolytic solution the reason of 0.1%-6%: when this additive content lower than 0.1% time, not easily form stable SEI film; When its content higher than 6% time, easily generate thicker SEI film and cause the increase of anode impedance, causing the performance of lithium rechargeable battery to reduce on the contrary.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, and described lithium salts is LiPF
6, LiClO
4, LiAsF
6, LiBF
4, LiN (CF
3sO
2)
2, LiCF
3sO
3with one or more in LiBOB.
One as electrolyte of lithium-ion secondary battery of the present invention is improved, one or more in described non-aqueous organic solvent ethylene carbonate (EC), propene carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), methyl ethyl carbonate (EMC), gamma-butyrolacton (BL), methyl formate (MF), Ethyl formate (MA), ethyl propionate (EP), oxolane (THF).
In order to realize foregoing invention object, present invention also offers a kind of lithium rechargeable battery, it comprises positive plate, negative plate, is interval in barrier film, electrolyte and package foil between positive plate and negative plate; Described positive plate comprises plus plate current-collecting body and is coated on the positive electrode active materials on plus plate current-collecting body; Described negative plate comprises negative current collector and is coated on the negative active core-shell material on negative current collector; Described electrolyte is the electrolyte of lithium-ion secondary battery described in above-mentioned any one.
One as lithium rechargeable battery of the present invention is improved, and described positive electrode active materials is cobalt acid lithium, lithium-nickel-manganese-cobalt ternary material or the mixture of the two.
One as lithium rechargeable battery of the present invention is improved, and described negative active core-shell material is graphite, silicon or the mixture of the two.
Accompanying drawing explanation
Fig. 1 is that benzoquinones generates the process of benzoquinones or poly benzoquinones lithium salts in graphite surface generation reduction reaction.
Embodiment
In order to make goal of the invention of the present invention, technical scheme and technique effect more clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be understood that, the embodiment described in this specification is only to explain the present invention, is not intended to limit the present invention.
Comparative example 1
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration be 1mol/L, obtain basic electrolyte; In basic electrolyte, add VC afterwards, its mass fraction is in the electrolytic solution 1%.
The preparation of positive plate: take the METHYLPYRROLIDONE (NMP) of 1.42Kg, 1.2Kg mass fraction is the polyvinylidene fluoride (PVDF) of 10%, the LiCoO of 0.16Kg electrically conductive graphite and 7.2Kg
2, after being fully uniformly mixed, obtain anode sizing agent; Anode sizing agent being coated on equably thickness is on the aluminium foil of 16 μm, through 120 DEG C of baking 1h, then compacting pole piece cutting, obtain positive plate.
The preparation of negative plate: take 1.2Kg mass fraction be 1.5% sodium carboxymethylcellulose (CMC) solution, 0.07Kg mass fraction be 50% SBR emulsion and 2.4Kg powdered graphite, fully obtain cathode size after mixing; Cathode size being coated on equably thickness is on the Copper Foil of 12 μm, through 120 DEG C of baking 1h, then compacting pole piece cutting, obtain negative plate.
The preparation of barrier film: using the polypropylene diaphragm of 12 μm as barrier film.
The preparation of lithium rechargeable battery: obtained positive plate, the negative plate polypropylene diaphragm of 12 μm are separated and are wound into square battery battery core, loads aluminum foil sack; After 80 DEG C of bakings dewater, inject electrolyte, seal, change into, be vented and test capacity, obtain finished product lithium rechargeable battery.
Comparative example 2
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add FEC afterwards, its mass fraction is in the electrolytic solution 3%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Comparative example 3
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and FEC afterwards, the two mass fraction is in the electrolytic solution respectively 1% and 3%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Comparative example 4
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add Benzoquinone III afterwards, its mass fraction is in the electrolytic solution 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 1
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone I, its mass fraction is in the electrolytic solution respectively 1% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 2
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone II, its mass fraction is in the electrolytic solution respectively 1% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 3
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 1% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 4
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone IV, its mass fraction is in the electrolytic solution respectively 1% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 5
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add FEC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 3% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 6
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC, FEC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 1%, 3% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 7
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 1% and 8%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 8
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add VC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 6% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
Embodiment 9
The preparation of electrolyte: in drying shed, EC:PC:DMC=1:1:1 takes solvent and mixes in mass ratio; Take a certain amount of LiPF
6add in solvent, make LiPF
6concentration is 1mol/L, obtains basic electrolyte; In basic electrolyte, add FEC and Benzoquinone III, its mass fraction is in the electrolytic solution respectively 10% and 2%.
The preparation method of lithium rechargeable battery, with comparative example 1, repeats no more here.
The test that cell thickness rate of change changes with high temperature storage number of days
At 25 DEG C, by lithium rechargeable battery obtained for comparative example 1-4 and embodiment 1-9 with 0.5C electric current constant current charge to 4.25V, then constant voltage charge to electric current is 0.05C under 4.25V, and the thickness of test lithium rechargeable battery is h1.Lithium rechargeable battery is put into the insulating box of 60 DEG C, be incubated 36 days, every the thickness h of 6 days test lithium rechargeable batteries, and calculate the thickness change of battery, formula is: thickness change (%)=(h-h1)/h1 × 100%, test result lists in table 1.
The test result that table 1, cell thickness expansion rate change with high temperature storage number of days
The test that internal resistance increase rate changes with high temperature storage number of days
At 25 DEG C, by lithium rechargeable battery obtained for comparative example 1-4 and embodiment 1-9 with 0.5C electric current constant current charge to 4.25V, then constant voltage charge to electric current is 0.05C under 4.25V, and the internal resistance of test lithium rechargeable battery is R1.Lithium rechargeable battery is put into the insulating box of 60 DEG C, be incubated 36 days, every the internal resistance R of 6 days test lithium rechargeable batteries, and calculate the internal resistance increase rate of battery, formula is: internal resistance increase rate (%)=(R-R1)/R1 × 100%, test result lists in table 2.
The test result that table 2, internal resistance of cell increment rate change with high temperature storage number of days
Discharge capacitance is with the test of circulating cycle number change
At 25 DEG C, by lithium rechargeable battery obtained for comparative example 1-4 and embodiment 1-9 with 0.5C electric current constant current charge to 4.25V, then be 0.05C at 4.25V constant voltage charge to electric current, leave standstill 5min; With 0.5C constant-current discharge to 3.0V, leave standstill 5min, with this discharge capacity for first time cyclic discharge capacity C1.Lithium rechargeable battery is carried out cycle charge discharge electrical testing in a manner described, and circulate 300 weeks, every the discharge capacity value C of record circulation in 60 weeks, and calculate the discharge capacitance of battery, formula is: discharge capacitance (%)=(C-C1)/C1 × 100%, test result lists in table 3.
Table 3, discharge capacity of the cell are with the conservation rate test result of circulating cycle number change
Internal resistance increase rate is with circulating cycle number change test
At 25 DEG C, by lithium rechargeable battery obtained for comparative example 1-4 and embodiment 1-9 with 0.5C electric current constant current charge to 4.25V, then under 4.25V, constant voltage charge to electric current is 0.05C, leaves standstill 5min, test battery internal resistance R1 '; With 0.5C constant-current discharge to 3.0V, leave standstill 5min.Lithium rechargeable battery is carried out cycle charge discharge electrical testing in a manner described, and circulate 300 weeks, every the internal resistance R ' of 60 weeks test batteries, and calculate the internal resistance increase rate of battery, formula is: internal resistance increase rate (%)=(R '-R1 ')/R1 ' × 100%, test result lists in table 4.
Table 4, internal resistance of cell increment rate are with the test result of circulating cycle number change
As can be seen from Table 1 and Table 2, compared with comparative example 1-4, embodiments of the invention 1-6 effectively improves flatulence in lithium rechargeable battery storing process and internal resistance increases problem, and embodiment 7-9 is but because certain additive amount too much could not play significantly improve effect.As can be seen from table 3 and table 4, compared with comparative example 1-4, embodiments of the invention 1-6 effectively improves capacity attenuation in lithium rechargeable battery charge and discharge cycles process and internal resistance increases problem, and embodiment 7-9 is but because certain additive amount too much could not play significantly improve effect.This joins in electrolyte because one or both in benzoquinones and derivative and VC and FEC thereof combine, compact structure can be formed and the SEI film of stable in properties at graphite surface, effectively stop electrolyte at the decomposition aerogenesis of graphite surface, improve SEI film simultaneously and thicken the capacity attenuation and internal resistance of cell increase problem that cause.
Known by describing above, benzoquinones and derivative thereof combinationally use longer-term storage and the cycle performance that really significantly can improve lithium rechargeable battery as one or both in electrolyte of lithium-ion secondary battery additive and VC and FEC.This is because benzoquinones and derivative thereof the reduction potential on graphite is more than 1.8V(vs.Li/Li
+), far above intercalation potential, therefore before Lithium-ion embeding graphite, can there is reduction reaction in benzene quinones substance on graphite, and the insoluble matter generating one deck densification is deposited on graphite surface, namely defines SEI film.
Research is by experiment analyzed benzoquinones and derivative thereof generate SEI film mechanism at graphite surface below, benzoquinones shown in composition graphs 1 generates the process of benzoquinones or poly benzoquinones lithium salts in graphite surface generation reduction reaction, and one or both inquiring in benzoquinones and derivative thereof and VC and FEC combinationally use the mechanism improving SEI film:
Due to the strong electron attraction of carbonylic oxygen atom, carbonylic carbon atom is made to be in electron deficient state, easy and nucleopilic reagent reacts, therefore the stage is changed at lithium rechargeable battery, two carbonylic carbon atoms on benzoquinones obtain electronics respectively, form 1,4-benzoquinone lithium salts with two lithium ions, the pi-electron cloud generation delocalization in two double bonds of benzoquinones molecule, form conjugated structure; The energy of this benzoquinones lithium salts conjugated structure is still higher, and the self-polymeric reaction of two dimension easily occurs, and generates the polyquinone lithium salts of trimerization benzoquinones lithium salts, five polyquinone lithium salts or more HMW; Visible, if only containing benzoquinones class additive in electrolyte, can be easy to generate the polymer lithium salts of very HMW and cause the impedance of SEI film to increase;
But, when benzoquinones class additive and VC or FEC used in combination time, the SEI composition that VC or FEC generates and the SEI film component that benzoquinones class additive generates combine, benzoquinones lithium salts just can be stoped ad infinitum to be polymerized the large molecule polyquinone lithium salts generating high impedance, to make benzoquinones lithium salts more easily form trimerization or five poly-Small molecular polyquinone lithium salts;
Due to the generation of autohemagglutination, the SEI membrane structure stability generated is excellent; Meanwhile, can reduce the cloud density on oxygen atom due to the conjugated structure formed, lithium ion is more easily dissociated, and the benzoquinones lithium salts therefore generated has very high lithium ion conductivity.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and amendment to above-mentioned execution mode.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (10)
1. an electrolyte of lithium-ion secondary battery, comprise lithium salts, non-aqueous organic solvent and additive, it is characterized in that: described additive comprise in vinylene carbonate, fluorinated ethylene carbonate one or both, also comprise formula I and/or the benzoquinones shown in formula II and derivative thereof
Wherein, R1, R2, R3, R4 in formula I and formula II are selected from hydrogen atom independently of one another, fluorine atom, carbon number are the alkyl of 1-6.
2. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described benzoquinones and derivative thereof mass fraction is in the electrolytic solution less than 10%.
3. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described benzoquinones and derivative thereof are preferably 1,4-benzoquinone, adjacent benzoquinones, fluoro 1,4-benzoquinone, methyl-p-benzoquinone, 6-methyl-2-fluoro 1,4-benzoquinone, perfluoro 1,4-benzoquinone, the adjacent benzoquinones of perfluoro.
4. electrolyte of lithium-ion secondary battery according to claim 1, it is characterized in that: described vinylene carbonate mass fraction is in the electrolytic solution 0.1%-5%, fluorinated ethylene carbonate mass fraction is in the electrolytic solution 0.1%-7%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
5. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described vinylene carbonate mass fraction is in the electrolytic solution 0.1%-5%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
6. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described fluorinated ethylene carbonate mass fraction is in the electrolytic solution 0.1%-7%, and benzoquinones and derivative thereof mass fraction is in the electrolytic solution 0.1%-6%.
7. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described lithium salts is LiPF
6, LiClO
4, LiAsF
6, LiBF
4, LiN (CF
3sO
2)
2, LiCF
3sO
3with one or more in LiBOB.
8. electrolyte of lithium-ion secondary battery according to claim 1, is characterized in that: described non-aqueous organic solvent comprises one or more in ethylene carbonate, propene carbonate, dimethyl carbonate, diethyl carbonate, methyl ethyl carbonate, gamma-butyrolacton, methyl formate, Ethyl formate, ethyl propionate, oxolane.
9. a lithium rechargeable battery, comprise positive plate, negative plate, be interval in barrier film, electrolyte and package foil between positive plate and negative plate, it is characterized in that: described positive plate comprises plus plate current-collecting body and is coated on the positive electrode active materials on plus plate current-collecting body; Described negative plate comprises negative current collector and is coated on the negative active core-shell material on negative current collector; The electrolyte of lithium-ion secondary battery of described electrolyte according to any one of claim 1 to 8.
10. lithium rechargeable battery according to claim 9, is characterized in that: described positive electrode active materials is cobalt acid lithium, lithium-nickel-manganese-cobalt ternary material or the mixture of the two; Described negative active core-shell material is graphite, silicon or the mixture of the two.
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| EP3783722A4 (en) * | 2018-09-12 | 2021-08-18 | Lg Chem, Ltd. | Non-aqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same |
| CN112119529B (en) * | 2018-09-12 | 2024-03-01 | 株式会社Lg新能源 | Nonaqueous electrolyte for lithium secondary battery and lithium secondary battery comprising same |
| US12100806B2 (en) | 2018-09-12 | 2024-09-24 | Lg Energy Solution, Ltd. | Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same |
| CN114583262A (en) * | 2020-11-30 | 2022-06-03 | 比亚迪股份有限公司 | Electrolyte and lithium ion battery |
| CN114583262B (en) * | 2020-11-30 | 2024-10-11 | 比亚迪股份有限公司 | Electrolyte and lithium ion battery |
| CN113871718A (en) * | 2021-08-17 | 2021-12-31 | 清华大学 | Internal salt type organic lithium salt, lithium battery electrolyte and quick-charging type lithium battery |
| CN113871718B (en) * | 2021-08-17 | 2023-03-21 | 清华大学 | Internal salt type organic lithium salt, lithium battery electrolyte and quick-charging type lithium battery |
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