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Lithium-ion battery electrolyte matched with silicon carbon graphite negative electrode and lithium-ion battery

A lithium-ion battery and graphite anode technology, applied in the field of lithium-ion batteries, can solve the problems of unstable SEI film, battery capacity decay, SEI damage, etc., and achieve the effects of reducing side reaction loss, reducing impedance, and inhibiting decomposition.

Active Publication Date: 2020-04-28
ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SEI film formed by the conventional electrolyte system on the surface of the silicon carbon negative electrode is unstable, and it is easy to cause SEI damage and shedding due to the volume effect in the charging and discharging process, resulting in a rapid decline in battery capacity

Method used

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  • Lithium-ion battery electrolyte matched with silicon carbon graphite negative electrode and lithium-ion battery
  • Lithium-ion battery electrolyte matched with silicon carbon graphite negative electrode and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a nitrogen-filled glove box (O2<2ppm, H2O<3ppm), mix dimethyl carbonate, diethyl carbonate, propylene carbonate, and fluoroethylene carbonate in a mass ratio of 3:5:2:1 , to prepare an organic solvent, and then add 1% DTD, 2% PS, 1% TMSP, 0.3% additive A (diethyl pyrocarbonate) and 0.5% additive B (2-methyl maleic anhydride) to obtain a mixed solution. Seal the solution and place it in the freezer (-4°C) for 2 hours, then take it out, and slowly add lithium hexafluorophosphate, bisfluorosulfonyl The mixture of lithium amine and lithium difluorophosphate is prepared into a 1.3mol / L lithium salt solution, and the electrolyte is made after mixing evenly.

[0029] Normal temperature cycle performance test:

[0030] Put the battery in an environment of 25°C, charge it with a constant current of 1C to 4.2V, then charge it with a constant voltage until the current drops to 0.05C, and then discharge it with a constant current of 1C to 3.0V, and cycle like this, record the ...

Embodiment 2

[0047] As shown in Table 1, except that 0.3% of the additive A diethyl pyrocarbonate is replaced by 0.3% of the additive C diallyl pyrocarbonate in the preparation of the electrolyte, the others are the same as in Example 1, and the obtained The data of high temperature performance, low temperature performance and rate performance are shown in Table 2.

Embodiment 3

[0049] As shown in Table 1, except that 0.3% of the additive A diethyl pyrocarbonate is replaced by 0.3% of the additive D di-tert-butyl pyrocarbonate in the preparation of the electrolyte, the others are the same as in Example 1, and the obtained The data of high temperature performance, low temperature performance and rate performance are shown in Table 2.

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Abstract

The invention discloses and provides an electrolyte suitable for a silicon-carbon negative electrode, and the electrolyte can reduce the expansion rate of the silicon-carbon negative electrode and effectively reduce the side reaction loss of the electrolyte. Meanwhile, the invention further provides a lithium-ion battery which is low in battery capacity attenuation speed, stable in performance andgood in actual discharge capacity. The lithium-ion battery electrolyte matched with the silicon-carbon graphite negative electrode comprises a stock solution and an additive added into the stock solution, the additive comprises an anhydride additive and a pyrocarbonate additive, and the anhydride additive and the pyrocarbonate additive are respectively an anhydride organic small molecule compoundand a pyrocarbonate organic small molecule compound. The lithium-ion battery comprises the lithium-ion battery electrolyte matched with the silicon carbon graphite negative electrode. The invention is applied to the technical field of lithium-ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to an electrolyte, in particular to a soft-packed lithium-ion silicon-carbon battery electrolyte and a lithium-ion battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital, electric tools, aerospace, energy storage, power vehicles and other fields due to their advantages such as high specific energy, no memory effect, and long cycle life. The rapid development of electronic information technology and consumer products has a great impact on lithium-ion batteries. Battery energy density performance puts forward higher requirements. At present, commercial lithium-ion batteries mainly use graphite as the negative electrode material, but the maximum theoretical specific capacity of graphite is only 372mAh / g. With the combination of aluminum and other positive electrode materials, the energy density of the battery is limited. To pursue higher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 白晶王霹霹毛冲黄秋洁程梅笑欧霜辉
Owner ZHUHAI SMOOTHWAY ELECTRONICS MATERIALS
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