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Lithium ion battery electrolyte and lithium ion battery

A lithium-ion battery, electrolyte technology, applied in the direction of secondary battery, secondary battery repair/maintenance, circuit, etc. Freezing point and other problems, to achieve the effect of improving reversible capacity and cycle performance, improving oxidative stability, and inhibiting dissolution

Active Publication Date: 2020-04-03
HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the electrolyte flame retardants reported in current patents or literatures have good flame retardant effects, most of them have disadvantages such as high viscosity and high freezing point, which have a relatively large negative impact on the electrochemical performance of the electrolyte.
In view of this, it is necessary to provide a highly efficient flame-retardant and electrochemically compatible lithium-ion battery electrolyte additive and its electrolyte, so as to solve the problem that the flame-retardant performance and electrochemical performance of batteries in the prior art cannot be balanced

Method used

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  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery
  • Lithium ion battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of electrolyte: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=1:1:1, and then add to the mixed solution Slowly add 12.5wt% lithium hexafluorophosphate based on the total weight of the electrolyte, 0.5wt% lithium bisfluorosulfonimide (LiTFSI) based on the total weight of the electrolyte and 1.25wt% lithium bisfluorosulfonimide based on the total weight of the electrolyte (LiFSI), finally add 0.5wt% additive A with the structure shown in formula I, 3wt% additive B with formula II, 0.5wt% vinyl sulfate (DTD) and 3.0wt% fluorine based on the total weight of the electrolyte Substitute ethylene carbonate (FEC), obtain the lithium-ion battery electrolyte of embodiment 1 after stirring evenly.

[0035] Preparation of lithium-ion battery: stack the prepared positive electrode sheet, separator, and negative electrode sheet in order, so that the separator is in the middle...

Embodiment 2-14

[0036] Embodiment 2-14 and comparative example 1-9

[0037] In Examples 2-14 and Comparative Examples 1-9, except that the proportions of the components of the electrolyte are added as shown in Table 1, the others are the same as in Example 1. In addition, the structural formulas of the additives of formula I and additives of formula II in each embodiment are shown in Table 2.

[0038] Table 1 embodiment 1-14 and the composition ratio of each component of the electrolyte of comparative example 1-9

[0039]

[0040]

[0041] Structural formula Ⅰ and structural formula Ⅱ specific material description in the embodiment of table 2

[0042]

[0043]

[0044] Performance Testing

[0045] Relevant performance tests were carried out on the batteries and their electrolytes prepared in Examples 1-14 and Comparative Examples 1-9.

[0046] (1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.2V at 0.7C constant current and constant volt...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery electrolyte and a lithium ion battery, the lithium ion battery electrolyte comprises a lithium salt, a non-aqueous organic solvent and additives, and the additives comprise a thiophene phosphate ester compound additive A with a structure shown in a formula I, a polyphenol compound additive B with a structure shown in a formula II and a negative electrode film-forming additive C. Compared with the prior art, the invention provides a lithium ion battery electrolyte with both flame retardant property and electrochemical performance. Through the synergistic effect of the thiophene phosphate ester compound additive, the polyphenol compound additive, the negative electrode film-forming additive and the lithium salt type additive, the electrolyte has excellent film forming performance on the surface of the electrode, so that the lithium ion battery has good electrochemicalperformance and safety performance, and the problem that the flame retardant performance and the electrochemical performance of the battery cannot be both considered in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery electrolyte and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. They are widely used in 3C digital products, electric vehicles, aerospace, and energy storage. However, safety performance is the key issue facing the large-scale application of lithium-ion batteries. In recent years, there have been many reports about lithium-ion batteries burning or even exploding, and the safety of lithium-ion batteries has aroused widespread concern. [0003] At present, lithium-ion battery electrolytes are widely based on organic solvents of carbonates, such as ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), etc. These solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 张丽娟熊伟徐宝杨山陈杰李载波
Owner HUIZHOU LIWINON NEW ENERGY TECH CO LTD
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