CN116053587A - Electrolyte for lithium ion battery and lithium ion battery - Google Patents

Electrolyte for lithium ion battery and lithium ion battery Download PDF

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Publication number
CN116053587A
CN116053587A CN202310157693.4A CN202310157693A CN116053587A CN 116053587 A CN116053587 A CN 116053587A CN 202310157693 A CN202310157693 A CN 202310157693A CN 116053587 A CN116053587 A CN 116053587A
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ion battery
lithium ion
electrolyte
lithium
additive
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时兰兰
周晓崇
付敏
苏敏
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Wanxiang A123 Systems Asia Co Ltd
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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
    • H01M10/0566—Liquid materials
    • H01M10/0567—Liquid materials characterised by the additives
    • 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
    • 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
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)

Abstract

The electrolyte for the lithium ion battery and the lithium ion battery comprise lithium salt, an organic solvent and an additive, wherein the structure of the additive is shown as a formula A, and particularly one or more of compounds shown as formulas 1-5, and the contained fluorosulfonic acid group can form a passivation film with excellent ion conductivity, so that the impedance of the lithium ion battery is reduced, and the improvement of low-temperature performance is facilitated; and the additive contains N, S double bonds, so that the ring-opening polymerization on the surface of the electrode can form an elastic and compact solid electrolyte membrane, and meanwhile, the active sites of the positive electrode can be passivated by complexing metal ions, so that the high-temperature cycle performance of the lithium ion battery is improved.

Description

Electrolyte for lithium ion battery and lithium ion battery
Technical Field
The invention belongs to the technical field of lithium ion batteries, relates to electrolyte, and particularly relates to electrolyte for a lithium ion battery and the lithium ion battery.
Background
The electrolyte serves as a bridge for connecting the anode and the cathode of the battery, and is called as 'blood of the battery', and plays a role in transmitting ions inside the battery. The electrolyte mainly comprises lithium salt, solvent and additive, and the type and proportion of the electrolyte are related to the performances of the battery in various aspects such as stability, circularity, safety and the like. With the development of new energy automobiles and power energy storage, people put forward higher requirements on the performance and applicability of batteries. Ternary-based high-energy-density materials are becoming a favorite of the lithium ion battery world, but under the system, the high-temperature cycle, storage and low-temperature performance of the battery are important factors for restricting the vigorous development of the battery.
At present, besides modifying anode and cathode materials, the optimization of electrolyte is another important strategy for solving the problem with low cost and high efficiency. Finding or synthesizing a suitable additive to form a dense and uniform passivation film on the surface of the electrode material, thereby preventing the collapse of the electrode material structure and slowing down the further decomposition of the electrolyte is a main strategy for stabilizing the battery performance.
As disclosed in chinese patent publication No. CN111883834a, a nonaqueous lithium ion battery electrolyte additive containing bipyridine sulfonyl salt is decomposed at the negative electrode to form a stable SEI film, and at the same time, decomposition of the electrolyte organic solvent at the electrode is inhibited, so that the electrode material is effectively protected, and thus the cycle performance of the battery is remarkably improved.
Chinese patent publication No. CN112234252a discloses a wide temperature range lithium ion battery nonaqueous electrolyte for high voltage, which is prepared by adding lithium fluorosulfonate (additive a) capable of forming an excellent ionic passivation film on the surface of an electrode, reducing the impedance of the battery, and improving the high temperature and low temperature cycle performance of the battery, and a S, P-containing high temperature additive (additive B) capable of complexing metal ions and passivating the active site of the positive electrode, to the electrolyte, and the two additives cooperate together to achieve the purpose of achieving both the high and low temperature performance of the lithium ion battery.
Although the above solutions can all achieve the purpose of improving the battery performance, the high-low temperature performance cannot be achieved, that is, the battery cannot have excellent chemical properties at high and low temperatures, and still is a main problem faced by lithium ion batteries. The main reason is that electrolyte is easy to be catalytically decomposed on the surface of the positive electrode under the high temperature condition, so that the problems of battery gassing, rapid capacity decay and the like are caused, and therefore, a positive electrode film forming additive with excellent performance is often required to be added. Although the use of the additive can effectively complex metal ions, passivate positive electrode active sites and reduce the safety risk of the battery, the internal resistance of the battery is obviously increased, and the rate performance and low-temperature performance of the battery are further deteriorated.
Although CN112234252a is a wide temperature range lithium ion battery nonaqueous electrolyte solution for high voltage, the synergistic use of multiple additives not only brings about cost problems, but also has potential problems such as incompatibility with other types of additives, so that the development of an additive which simultaneously gives consideration to both high and low temperature performance is not satisfactory.
Disclosure of Invention
The invention aims to provide a nonaqueous electrolyte for a lithium ion battery and the lithium ion battery. The nonaqueous electrolyte for the lithium ion battery comprises lithium salt, an organic solvent and an additive, wherein the structure of the additive is shown as a formula A, and particularly one or more of compounds (1) to (5), and the additive not only can form an excellent ionic passivation film on the surface of an electrode, but also can reduce the internal impedance of the battery, improve the high-low temperature performance of the battery, and simultaneously can complex metal ions, passivate an active site of an anode and give consideration to the high-low temperature performance of the lithium ion battery.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention firstly provides electrolyte for a lithium ion battery, which comprises electrolyte salt, a nonaqueous solvent, an additive B and an additive A, wherein the structural formula of the additive A is shown as follows:
Figure BDA0004093037240000021
wherein R1-R4 are H, N and S and silicon-based or silicon-based derivatives thereof, or are one or more of alkyl groups with 1-7 carbon atoms and derivatives thereof.
As a preferable mode of the present invention, the additive a is at least one selected from the group consisting of compounds represented by formulas 1 to 5;
Figure BDA0004093037240000022
in the invention, the additive A is an additive containing cyclic heterocyclic fluorosulfonate, and the contained fluorosulfonate can form a passivation film with excellent ion conductivity, so that the impedance of the lithium ion battery is reduced, and the improvement of low-temperature performance is facilitated; and the additive contains N, S double bonds, so that the ring-opening polymerization on the surface of the electrode can form an elastic and compact solid electrolyte membrane, and meanwhile, the active sites of the positive electrode can be passivated by complexing metal ions, so that the high-temperature cycle performance of the lithium ion battery is improved.
As a preferable scheme of the invention, the additive A accounts for 0.01-10% of the total mass of the electrolyte according to the mass percentage.
As a preferred embodiment of the present invention, the solvent includes one or more of Ethylene Carbonate (EC), propylene Carbonate (PC), dimethyl carbonate (DMC), diethyl carbonate (DEC), diethyl carbonate (EMC), dipropyl carbonate, ethyl acetate, methyl acetate, ethyl propionate, propyl acetate, propyl propionate. The solvent used in the present invention includes two or more of the above solvents. The present invention is not limited to the ratio between solvents.
As a preferred embodiment of the present invention, the electrolyte salt comprises lithium hexafluorophosphate (LiPF 6 ) Lithium bis (fluorosulfonyl) imide (LiFSI), lithium bis (trifluoromethylsulfonyl) imide (LiTFSI), from which one or more are selected as the primary salts of the present invention. The present invention is not limited to the content and proportion of lithium salt.
The mass fraction of the lithium salt and the solvent in the electrolyte is not particularly limited, and can be limited by referring to the mass fraction of the lithium salt and the solvent in the electrolyte commonly used in the lithium ion battery, or can be determined according to factors such as the positive electrode material, the negative electrode material, the diaphragm, the cell design, the development requirement and the like of the lithium ion battery. In a specific embodiment of the present invention, the concentration of the lithium electrolyte salt in the solvent is 0.8 to 1.5mol/L.
As a preferable scheme of the invention, the additive B comprises a positive electrode film-forming additive and a negative electrode film-forming additive, wherein the positive electrode film-forming additive comprises one or more of propane sultone, vinyl sulfate and methane disulfonic acid methylene ester, and the negative electrode film-forming additive comprises one or two of ethylene carbonate and fluoroethylene carbonate.
The invention also provides a lithium ion battery, which comprises a positive plate containing a positive active material, wherein the positive active material mainly comprises a ternary material and a lithium iron phosphate material, the lithium ion battery also comprises a negative plate of which the active material is artificial graphite, natural graphite, soft carbon, hard carbon, silicon carbon, silica and the like, and the other components are a diaphragm and the electrolyte for the lithium ion battery.
As a preferred scheme of the invention, the positive plate comprises a positive active material for inserting or extracting lithium ions, a conductive agent, a current collector and a binder, wherein the positive active material of the lithium ion battery comprises one or more of lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, nickel cobalt manganese ternary material, nickel cobalt aluminum ternary material and lithium-rich manganese material.
As a preferable scheme of the invention, the positive electrode is an aluminum foil pole piece coated with a nickel-cobalt-manganese ternary material.
As a preferred embodiment of the present invention, the negative electrode sheet comprises a negative electrode active material capable of intercalating or deintercalating lithium ions, a conductive agent, a current collector and a binder, and the negative electrode active material of the lithium ion battery comprises one or more of natural graphite, artificial graphite, hard carbon, soft carbon, silicon carbon and silica; the invention does not strictly limit the type of the anode active material, and the current common anode active materials can meet the requirements of the invention;
the diaphragm comprises one of a polypropylene diaphragm, a polyethylene/polypropylene double-layer composite film, a polyimide electrostatic spinning diaphragm, a polypropylene/polyethylene/polypropylene three-layer composite film, a ceramic diaphragm and a PVDF glue coating diaphragm, the selection range of the diaphragm is not strictly limited, and the current common diaphragm meets the requirements of the invention.
Compared with the prior art, the invention has the following beneficial effects:
1) Aiming at the problems of battery gas expansion, rapid capacity decay and the like caused by the easy catalytic decomposition of electrolyte on the surface of the positive electrode under the high temperature condition, the positive electrode film forming additive with excellent performance is often required to be added. Although the use of the additive can effectively complex metal ions, passivate positive electrode active sites and reduce the safety risk of the battery, the internal resistance of the battery is obviously increased, and the rate performance and low-temperature performance of the battery are further deteriorated. Therefore, the invention is particularly important to develop an additive and electrolyte which can simultaneously give consideration to high and low temperature performance.
2) The non-aqueous electrolyte for the lithium ion battery comprises lithium salt, an organic solvent and an additive, wherein the structure of the additive is shown as a formula A, and the additive not only can form an excellent ionic passivation film on the surface of an electrode, but also can reduce the internal impedance of the battery, improve the high-low temperature performance of the battery, and simultaneously can complex metal ions, passivate an active site of an anode and give consideration to the high-low temperature performance of the lithium ion battery.
Detailed description of the preferred embodiments
The present invention will be further described with reference to the following examples, in which technical terms and comparative examples are defined in the same manner as the concepts in the lithium ion battery field. The chemical reagents used in the following examples and comparative examples were all conventional chemical reagents unless otherwise specified. Furthermore, the following detailed description of the examples and comparative examples is not to be construed as limiting the invention in any way, and any limited number of modifications which may be made within the scope of the claims hereof.
The invention provides electrolyte for a lithium ion battery, which comprises electrolyte salt, a nonaqueous solvent, an additive B and an additive A, wherein the structural formula of the additive A is shown as follows:
Figure BDA0004093037240000041
wherein R1-R4 are H, N and S and silicon-based or silicon-based derivatives thereof, or are one or more of alkyl groups with 1-7 carbon atoms and derivatives thereof.
Preferably, the additive A is at least one selected from the compounds shown in the formulas 1-5;
Figure BDA0004093037240000042
Figure BDA0004093037240000051
the electrochemical properties of the electrolyte according to the present invention are described below by way of data of examples and comparative examples.
The electrolyte used in this example and comparative example was prepared by the following method: the moisture content in the glove box is controlled to be not more than 10ppm, and the cyclic carbonate solvent Ethylene Carbonate (EC), propylene Carbonate (PC), the linear carbonate solvent methyl ethyl carbonate (EMC) and dimethyl carbonate (DMC) are fully stirred and mixed uniformly according to the proportion of 30/5/45/20, and the molecular sieve is adopted for purification, impurity removal and water removal.
Under the condition of room temperature, adding 1.2mol/L lithium hexafluorophosphate (LiPF 6) into a mixed solvent, stirring while adding, and after uniformly mixing, adding 0.5 mass percent of lithium difluorophosphate and 5 mass percent of fluoroethylene carbonate (FEC) to obtain a basic sample solution.
Specific examples are as follows:
example 1
In the embodiment, the electrolyte containing the cyclic heterocyclic fluorosulfonate compound shown in the formula 1 is obtained after fully and uniformly mixing all the cyclic heterocyclic fluorosulfonate compounds, and the addition amount of the electrolyte is 0.3% of the total mass fraction of the electrolyte.
Example 2
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic fluorosulfonate compound represented by formula 1 is 0.5% of the total mass fraction of the electrolyte.
Example 3
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic fluorosulfonate compound represented by formula 1 is 1% of the total mass fraction of the electrolyte.
Example 4
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic ring-containing fluorosulfonate compound represented by formula 2 is 0.3% of the total mass fraction of the electrolyte.
Example 5
Compared with example 1, the difference of this example is that the addition amount of the cyclic heterocyclic ring-containing fluorosulfonate compound represented by formula 2 is 0.5% by mass of the total mass fraction of the electrolyte.
Example 6
Compared with example 1, the difference of this example is that the cyclic heterocyclic fluorosulfonate compound represented by formula 3 is added in an amount of 0.3% by mass of the total electrolyte.
Example 7
Compared with example 1, the difference of this example is that the addition amount of the cyclic heterocyclic fluorosulfonate compound represented by formula 3 is 0.5% of the total mass fraction of the electrolyte.
Example 8
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic ring-containing fluorosulfonate compound represented by formula 4 is 0.3% of the total mass fraction of the electrolyte.
Example 9
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic ring-containing fluorosulfonate compound represented by formula 4 is 0.5% by mass of the total mass fraction of the electrolyte.
Example 10
Compared with example 1, the difference of this example is that the added amount of the cyclic heterocyclic ring-containing fluorosulfonate compound represented by formula 5 is 0.3% of the total mass fraction of the electrolyte.
Comparative example 1
The comparative example does not add any cyclic heterocyclic fluorosulfonate compound as an additive;
the positive electrode active material of the lithium ion batteries used in the present examples and comparative examples was lini0.8co0.1mn0.1o2/graphite soft pack battery.
Preparation of positive plate
Dispersing one or more positive electrode active materials, a conductive agent and a binder polyvinylidene fluoride (PVDF) into a proper amount of N-methyl pyrrolidone according to the mass ratio of 96:2:2, and then fully and uniformly stirring the materials according to the pulping step. Uniformly coating the uniformly dispersed positive electrode slurry on an aluminum foil, and baking, rolling, slitting and punching to obtain the positive electrode plate.
Preparation of negative plate
The specific manufacturing process of the negative plate comprises the following steps: one or more negative electrode active materials, a conductive agent, styrene Butadiene Rubber (SBR) and sodium carboxymethylcellulose (CMC) are selected, all raw materials are dispersed into water according to the mass ratio of 97:1:1:1, and the uniformly dispersed negative electrode slurry is prepared according to a pulping process. And uniformly coating the negative electrode slurry on a copper foil, and baking, rolling, slitting and punching to obtain the negative electrode plate.
And assembling the obtained positive plate, negative plate and diaphragm to obtain a snack, packaging the battery core, injecting electrolyte, sealing again, and performing the procedures of formation, capacity division and the like to obtain the lithium ion battery.
Lithium ion battery performance test
The electrolytes of examples 1 to 10 and comparative example 1 and lithium ion batteries were tested and compared for performance differences using the following methods:
(1) 60 ℃ high-temperature storage performance test
And (3) charging the lithium ion battery to 4.25V at room temperature by using a 1C constant current and constant voltage, stopping the current at 0.05C, discharging to 2.8V by using a 1C constant current, recording the discharge capacity C0 of the lithium ion battery at the moment, charging to 4.25V by using a 1C constant current and constant voltage, stopping the current at 0.05C, storing in a 60 ℃ constant temperature box for 30 days after full charge, and then testing the holding capacity Cn of the battery by using a standard charge-discharge flow of the battery.
The capacity retention rate of the lithium ion battery after 30 days of storage at 60 ℃ is=cn/c0 x 100%,
wherein n is the storage days of the lithium ion battery at 60 ℃.
(2) 45 ℃ high temperature cycle performance test
And 1C is charged to 4.25V at constant current and constant voltage, the cut-off current is 0.05C, then 1C is discharged to 2.8V at constant current, the cycle is carried out for 800 circles, and the cycle capacity retention percentage is tested. The calculation formula is as follows:
the capacity retention (%) = (discharge capacity of the nth cycle/first discharge capacity) ×100% after n cycles of the lithium ion battery; wherein n is the cycle number of the lithium ion battery.
(3) Low temperature discharge performance
Under the condition of normal temperature (25 ℃), 1C charge and 1C discharge are carried out on the lithium ion battery once, the discharge capacity is recorded as DC0, then the lithium ion battery is charged to 4.25V under the condition of constant current and constant voltage of 1C, then the lithium ion battery is placed in an open circuit for 4 hours under the condition that the ambient temperature is minus 20+/-2 ℃, the discharge test of 1C multiplying power is carried out, the discharge capacity DC1 is recorded, and the low-temperature discharge efficiency of the battery is calculated according to the following formula: low temperature discharge efficiency (%) =dc 1/DC0×100%.
The results of the above performance tests are shown in table 1:
table 1. Lithium ion battery electrical performance test results:
Figure BDA0004093037240000071
/>
Figure BDA0004093037240000081
comparing the results shown in Table 1, the following correlation results can be obtained: after the additive containing the cyclic heterocyclic fluorosulfonate compound is added, the capacity recovery rate is obviously improved after the additive is stored at the high temperature of 60 ℃ for 30 days, the capacity retention rate is obviously improved after the additive is circulated for 500 circles at the temperature of 45 ℃, and the low-temperature discharge at-20 ℃ is obviously improved.
In examples 1 to 3, when the amount of the cyclic heterocyclic fluorosulfonate compound (1) added was gradually increased, the high-temperature cycle performance, the high-temperature storage performance and the low-temperature discharge performance of the battery were significantly improved. This is mainly because the cyclic compound can undergo ring-opening polymerization and oxidative decomposition of fluorosulfonate on the surface of the positive electrode to form a dense and stable solid electrolyte membrane, and at the same time, metal ions can be complexed, the electrode active sites can be reduced, and the impedance can be reduced, thereby improving the performance of the battery. However, excessive addition also causes significant adverse effects due to excessive growth of the solid electrolyte membrane on the electrode surface.
In examples 4-5 and examples 8-9, it was observed that the introduction of silicon groups greatly improved the high temperature performance of the battery, mainly because the cleavage of Si-N bonds facilitates the formation of the additive at the negative electrode, increases the stability of the CEI film, and the Si-N groups and N-containing heterocycles belong to Lewis bases, having excellent adsorption and removal properties for HF and moisture in the electrolyte, thereby improving the performance of the battery, and forming an accumulation in the improvement effect.
While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the invention. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims (10)

1. The electrolyte for the lithium ion battery is characterized by comprising electrolyte salt, a nonaqueous solvent, an additive B and an additive A, wherein the structural formula of the additive A is shown as follows:
Figure FDA0004093037230000011
wherein R1-R4 are H, N and S and silicon-based or silicon-based derivatives thereof, or are one or more of alkyl groups with 1-7 carbon atoms and derivatives thereof.
2. The electrolyte for a lithium ion battery according to claim 1, wherein the additive a is at least one selected from the group consisting of compounds represented by formulas 1 to 5;
Figure FDA0004093037230000012
3. the electrolyte for a lithium ion battery according to claim 1 or 2, wherein the additive a accounts for 0.01-10% of the total mass of the electrolyte in mass percent.
4. The electrolyte for a lithium ion battery according to claim 1 or 2, wherein the solvent comprises one or more of ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, dipropyl carbonate of methylethyl carbonate, ethyl acetate, methyl acetate, ethyl propionate, propyl acetate, propyl propionate.
5. The electrolyte for a lithium ion battery according to claim 1 or 2, wherein the electrolyte salt comprises one or more of lithium hexafluorophosphate, lithium bis (fluorosulfonyl) imide, and lithium bis (trifluoromethylsulfonyl) imide, and the concentration of the electrolyte lithium salt in the solvent is 0.8 to 1.5mol/L.
6. The electrolyte for a lithium ion battery according to claim 5, wherein the additive B comprises a positive electrode film-forming additive and a negative electrode film-forming additive, the positive electrode film-forming additive comprises one or more of propane sultone, vinyl sulfate and methylene methane disulfonate, and the negative electrode film-forming additive comprises one or two of ethylene carbonate and fluoroethylene carbonate.
7. A lithium ion battery, comprising a positive electrode sheet, a negative electrode sheet, a separator and the electrolyte for a lithium ion battery according to any one of claims 1 to 6.
8. The lithium ion battery of claim 7, wherein the positive electrode sheet comprises a positive electrode active material for inserting or extracting lithium ions, a conductive agent, a current collector and a binder, and the positive electrode active material of the lithium ion battery comprises one or more of lithium cobaltate, lithium manganate, lithium nickelate, lithium iron phosphate, nickel cobalt manganese ternary material, nickel cobalt aluminum ternary material and lithium manganese rich material.
9. The lithium ion battery of claim 7, wherein the positive electrode is an aluminum foil pole piece coated with a nickel-cobalt-manganese ternary material.
10. The lithium ion battery according to claim 7, wherein the negative electrode sheet comprises a negative electrode active material capable of intercalating or deintercalating lithium ions, a conductive agent, a current collector and a binder, and the negative electrode active material of the lithium ion battery comprises one or more of natural graphite, artificial graphite, hard carbon, soft carbon, silicon carbon and silicon oxygen; the membrane comprises one of a polypropylene membrane, a polyethylene/polypropylene double-layer composite membrane, a polyimide electrostatic spinning membrane, a polypropylene/polyethylene/polypropylene three-layer composite membrane, a ceramic membrane and a PVDF glue coating membrane.
CN202310157693.4A 2023-02-23 2023-02-23 Electrolyte for lithium ion battery and lithium ion battery Pending CN116053587A (en)

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