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Lithium ion battery and preparation method thereof

A lithium-ion battery and electrolyte technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve problems such as volume expansion, achieve the effects of suppressing thickness growth, improving cycle safety, and simple and easy preparation methods

Active Publication Date: 2022-07-29
天鹏锂能技术(淮安)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a lithium-ion battery, which is used to solve the technical problems caused by volume expansion and contraction due to the crystal structure characteristics of silicon materials in the prior art, thereby affecting the cycle life and safety of the battery; The types of negative electrode binders and electrolyte additives are limited, which improves the storage performance of batteries while ensuring the safety performance of silicon-containing batteries

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0090] (1) Preparation of electrolyte: according to the mass percentage, 16% ethylene carbonate, 8% ethyl methyl carbonate, 53.5% dimethyl carbonate, 1% vinylene carbonate, 4% fluoroethylene carbonate, 17% lithium hexafluorophosphate and 0.5% cyano compound B2 are mixed and stirred to obtain an electrolyte.

[0091] (2) Preparation of negative pole piece: Mix and stir 1.8% CMC (carboxymethyl cellulose) with water to obtain a glue solution, followed by 90.7% graphite, 5% silicon oxide material (SiO 2 ), 0.5% conductive agent carbon black and 2% acrylate binder A1 are added to the glue solution and mixed and stirred to obtain a negative electrode slurry, which is coated, baked, rolled and cut to obtain a negative electrode pole piece;

[0092] (3) Preparation of positive electrode sheet: Mix 1.5% PVDF (polyvinylidene fluoride) with water to obtain a glue solution, and then mix 96% LiNi 0.8 Co 0.1 Mn 0.1 O 2 , 2.5% of the conductive agent carbon black is added to the glue sol...

Embodiment 2~9

[0095] Basically the same as Example 1, the only difference is:

[0096] In Examples 2 to 9, the additives were selected from acrylate adhesives A2, A3, A4, A5, A6, A7, A8, and A9, respectively.

Embodiment 10~20

[0098] Basically the same as Example 6, the only difference is:

[0099] In Examples 10-20, 0.5% cyano compounds B1, B3, B4, B5, B6, B7, B8, B9, B10, B11, B12 were selected as the additives respectively.

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Abstract

The invention provides a lithium ion battery and a preparation method thereof, and relates to the technical field of lithium ion batteries. Specifically, the lithium ion battery mainly comprises a positive electrode, a negative electrode, electrolyte and a diaphragm, wherein the negative electrode comprises graphite, a silica material and a binder, and the binder comprises an acrylate compound; the electrolyte comprises a cyano compound. According to the invention, the short-circuit safety problem of the silicon-containing negative electrode is solved by adding the olefine acid ester binder, and the olefine acid ester binder has strong binding force on the expansion of the negative electrode, and can well inhibit the thickness increase of the negative electrode piece in the circulation process, thereby reducing the safety risk caused by the expansion of the negative electrode piece; meanwhile, a cyano additive is used in the electrolyte, so that the negative effect caused by an acrylate binder is solved, and the overall circulation and storage safety performance of the battery is greatly improved at the same time.

Description

technical field [0001] The present invention relates to the technical field of lithium ion batteries, in particular, to a lithium ion battery and a preparation method thereof. Background technique [0002] In recent years, lithium-ion secondary batteries have become more and more widely used in mobile phones, computers, energy storage, power tools, and electric vehicles. In the process of use, having higher energy density and cycle life has always been one of the goals pursued by people. In order to achieve higher energy density, silicon-containing anode materials have been gradually developed and applied to lithium-ion batteries. This is due to the higher gram capacity of silicon-containing anodes, which can achieve higher battery capacity under the same design volume. Significantly increase the energy density of the battery. [0003] However, due to its own crystal structure characteristics, silicon material will bring about 300% volume expansion during the charging proc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0567H01M10/0525H01M10/058
CPCH01M4/621H01M10/0567H01M10/0525H01M10/058H01M2004/027H01M2200/00Y02E60/10
Inventor 马娟卞亚娟姜鹏程许淑义郑春龙
Owner 天鹏锂能技术(淮安)有限公司
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