Battery electrolyte additive, electrolyte containing additive and application of electrolyte

An electrolyte additive and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve the problems of poor performance at room temperature and high temperature, and achieve the effects of reducing reactivity, preventing decomposition process, and good stability

Active Publication Date: 2019-04-16
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the solvent content with low melting point and low viscosity is increased, the low temperature performance of the battery

Method used

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  • Battery electrolyte additive, electrolyte containing additive and application of electrolyte
  • Battery electrolyte additive, electrolyte containing additive and application of electrolyte
  • Battery electrolyte additive, electrolyte containing additive and application of electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 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 2.5wt% lithium bisfluorosulfonimide based on the total weight of the electrolyte (LiFSI), finally add 1.0wt% of the compound with the structure shown in formula I based on the total weight of the electrolyte, 0.1wt% of the cyclic anhydride compound shown in the formula II, 2.0wt% vinyl sulfate (DTD) and 1.0 wt% fluoroethylene carbonate (FEC), and stir to obtain the lithium-ion battery electrolyte of Example 1.

[0057] Preparation of lithium-ion battery: stack the prepared positive electrode sheet, separator, and negative electrode sheet in order, so that the separator is in ...

Embodiment 2-12

[0058] Embodiment 2-12 and comparative example 1-9

[0059] In Examples 2-12 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.

[0060] Table 1 embodiment 1-12 and the composition ratio of each component of the electrolyte of comparative example 1-9

[0061]

[0062]

[0063]

[0064] Structural formula Ⅰ and structural formula Ⅱ specific material description in the embodiment of table 2

[0065]

[0066]

[0067] Performance Testing

[0068] Performance tests were performed on the batteries prepared in Examples 1-12 and Comparative Examples 1-9.

[0069] (1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.35V at 1C constant current and constant voltage, with a cut-off cur...

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a battery electrolyte additive, an electrolyte containing the additive and application of the electrolyte. The lithium ion battery electrolyte additive provided by the invention consists of a fluorosulfonic acid compound with a structural formula I and a cyclic acid anhydride compound with a structural formula II, and the electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and the additive, wherein the additive contains a negative electrode film-forming additive, thefluorosulfonic acid compound with the structural formula I and an acid anhydride compound with the structural formula II. The fluorosulfonic acid compound with the structural formula I and the acid anhydride compound with the structural formula II can form a stable and compact interface protection film on the surface of a positive electrode material; dissolution of metal ions in the positive electrode material under the high-temperature condition is inhibited, the high and low temperature performance, the rate capability, the cycle performance and the service life of the lithium ion battery are effectively improved, and the problem that the temperature performance of the battery cannot be considered in the prior art is well solved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a battery electrolyte additive, an electrolyte containing the additive and applications thereof. Background technique [0002] Due to the advantages of high operating voltage, high energy density, long cycle life and environmental friendliness, lithium-ion batteries are widely used in 3C digital, power tools, aerospace, energy storage, power vehicles and other fields. With the rapid development of electronic information technology and consumer products, higher requirements are put forward for the performance of lithium-ion batteries in all aspects, and the development of electrolytes with excellent comprehensive properties such as high rate, long cycle life, high capacity and high retention rate The system is one of the important goals of developing high-performance lithium-ion batteries, and it is also one of the important ways to improve the energy density of lith...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 张丽娟朱学全潘立宁郭力大浦靖
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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