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Lithium ion battery non-aqueous electrolyte and lithium ion battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of unstable crystal structure, reduced safety performance, high positive electrode activity, etc., and achieve the effects of protecting battery performance, inhibiting decomposition, and excellent performance

Active Publication Date: 2021-01-05
香河昆仑新能源材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the use of lithium-ion batteries, as the voltage increases, the crystal structure produced by the positive electrode will be unstable. When the voltage reaches a certain value, the safety performance will also decrease, and the positive electrode material will decompose to generate oxygen; under high voltage, The positive electrode has high activity, which easily decomposes the electrolyte, causes the battery to produce gas, and is prone to deflagration

Method used

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  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Electrolyte preparation: The electrolyte is prepared in a glove box, the actual oxygen content in the glove box is 6 Add above-mentioned organic solvent, add 1wt% additive with structural formula I, then add 0.5wt% vinylene carbonate (VC) and 3.5wt% 1,3-propane sultone (PS2), be formulated with non-aqueous Lithium-ion battery electrolyte, the total weight of the non-aqueous electrolyte is 100wt%.

[0035] (2) Preparation of lithium-ion batteries: LiCoO 2 The positive electrode sheet is the active material; the SiO-artificial graphite is used as the negative electrode sheet; the polypropylene is used as the diaphragm, and the non-aqueous electrolyte of this embodiment is used to make a pouch battery by conventional methods in the field. The method for preparing lithium-ion batteries in the following examples and comparative examples is the same.

Embodiment 2-4 and comparative example 1-4

[0037] Examples 2-4 and Comparative Examples 1-4 are the same as Example 1 except that the electrolyte composition is different. The details are shown in Table 1.

[0038] Table 1

[0039]

[0040] Embodiment 1-4 and comparative example 1-4 are respectively carried out the test of high-temperature cycle performance and high-temperature storage performance, and test index and test method are as follows:

[0041] (1) Cycle performance: It is reflected by testing the capacity retention rate of the battery at 25°C and 0.5C cycles for N times. The specific method is:

[0042] Place the battery in an environment of 25°C, and charge the formed battery to 4.45V (LiCoO 2 / SiO-artificial graphite), the cut-off current is 0.02C, and then discharged to 3.0V with a constant current of 0.5C. After such a charge / discharge cycle, calculate the capacity retention rate after cycle 600 to evaluate its cycle performance.

[0043] The formula for calculating the capacity retention after 600...

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Abstract

The present invention provides a lithium ion battery non-aqueous electrolyte and a lithium ion battery; the lithium ion battery non-aqueous electrolyte comprises a lithium salt, an organic solvent andan additive, and the additive comprises a compound represented by a formula I. The additive in the electrolyte provided by the invention can form a layer of solid electrolyte interface film on the positive electrode and the negative electrode, the decomposition of the electrolyte on the surface of the electrode is inhibited, the problem of battery performance attenuation of the battery under a high-voltage condition can be effectively solved, and in addition, the lithium ion battery added with the additive has a good flame-retardant effect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a nonaqueous electrolyte solution of lithium ion batteries and a lithium ion battery. Background technique [0002] Lithium-ion battery is a kind of secondary battery, which uses the movement of lithium ions between the positive and negative electrodes to complete the charging and discharging process. It has the advantages of high voltage, long cycle life, good safety performance, fast charging and discharging, etc., so it is often used in mobile phones, computers and electric vehicles. At present, the demand for commercial lithium-ion batteries in the market is increasing, and the performance requirements for lithium-ion batteries are also getting higher and higher. Improving the battery voltage while maintaining its performance without being affected is a problem that needs to be solved at present. [0003] During the use of lithium-ion batteries, as the voltage in...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42A62C3/16
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235A62C3/16Y02E60/10Y02P70/50
Inventor 郑畅万广聪郭营军杨冰申海鹏李新丽
Owner 香河昆仑新能源材料股份有限公司
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