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Soft package lithium ion silicon carbon battery electrolyte and lithium ion battery

A silicon carbon battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of high temperature storage performance and cycle life reduction of batteries, and achieve the effect of high oxidation stability

Active Publication Date: 2019-07-23
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The improvement of energy density will inevitably lead to the reduction of high-temperature storage performance and cycle life of the battery, as well as the electrolyte compatibility problems caused by the high compaction density of the material and the silicon carbide of the negative electrode.

Method used

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  • Soft package lithium ion silicon carbon battery electrolyte and lithium ion battery
  • Soft package lithium ion silicon carbon battery electrolyte and lithium ion battery
  • Soft package lithium ion silicon carbon battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a soft-packed lithium-ion silicon-carbon battery, the preparation method of which is as follows:

[0029] (1) Positive electrode preparation: The high-voltage positive electrode active material high-voltage 4.43V lithium cobaltate (LiCoO2) (purchased from Xiamen Tungsten New Energy), CNTs (carbon nanotubes) and PVDF (polyvinylidene fluoride) according to the mass ratio of 98.2: 0.8:1.0 mixed evenly, and then dispersed in N-methyl-2-pyrrolidone to obtain the positive electrode slurry; the positive electrode slurry was evenly coated on both sides of the aluminum foil, and the positive electrode sheet was obtained after rolling and cutting, and finally baked Roast and vacuum dry before use.

[0030] (2) Negative electrode preparation: Silicon carbon T3C-500 negative electrode material (purchased from Aminte New Materials), acetylene black, CMC (carboxymethyl cellulose), and LA136D binder (Indile) were used in a mass ratio of 97.0:1.0 : 0.5: 1.5 mi...

Embodiment 2

[0034] This embodiment provides a soft-packed lithium-ion silicon-carbon battery, the preparation method of which except that the organic solvent accounts for 66.5% of the total mass of the electrolyte and additive A and additive B respectively account for 1% and 4% of the total mass of the electrolyte, other conditions All the same as in Example 1.

Embodiment 3

[0036] This embodiment provides a kind of soft pack lithium-ion silicon carbon battery, except adding A is replaced by

[0037] Except, other conditions are all identical with embodiment 1.

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Abstract

The invention provides a soft package lithium ion silicon carbon battery electrolyte and a lithium ion battery. The electrolyte comprises an additive A and an additive B, the structure of the additiveA is shown as a formula I, and the structure of the additive B is shown as a formula II. The electrolyte forms a protective film on the positive electrode and the negative electrode, so that the positive electrode and the negative electrode of the battery have better high-voltage resistance, the expansion rate of the silicon carbon negative electrode is reduced, the side reaction loss of the electrolyte is effectively reduced, the cycle life of the battery is prolonged, the high-temperature storage performance of the battery is improved, and the low-temperature charging and discharging performance of the battery is not influenced.

Description

technical field [0001] The invention belongs to the 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] In recent years, the demand for lithium-ion batteries in electronic products has continued to increase, and lithium-ion batteries have developed rapidly. At the same time, the requirements for high energy density of batteries have also continued to increase. High-voltage lithium cobalt oxide materials have been applied, and the voltage of batteries is constantly increasing. Improve, from the original 4.2V to 4.4V, 4.43V, 4.45V, 4.48V, and there is a possibility of continuous improvement in the future. The improvement of energy density will inevitably lead to the reduction of high-temperature storage performance and cycle life of the battery, as well as the compatibility of the electrolyte caused by the high compaction density of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 高学友朱坤庆夏小勇庞佩佩计阳聂灿陶德瑜刘露陈伟峰楚英张涛
Owner 东莞维科电池有限公司
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