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Lithium ion battery

A lithium-ion battery, lithium salt technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as insufficient safety performance

Pending Publication Date: 2022-06-03
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of insufficient safety performance in existing high-voltage and high-pressure lithium-ion batteries, the invention provides a lithium-ion battery

Method used

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Examples

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Embodiment 1

[0118] This embodiment is used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including the following operation steps:

[0119] 1) Preparation of positive electrode sheet

[0120] The cathode active material LiCoO 2 , conductive carbon black and binder PVDF are dispersed in non-aqueous organic solvent NMP (N-methyl-2-pyrrolidone) and mixed evenly to obtain positive electrode slurry; the positive electrode slurry is uniformly coated on the positive electrode current collector aluminum foil, After drying, rolling and cutting, a positive electrode sheet is obtained, and the weight ratio of the positive electrode active material, the conductive carbon black and the binder PVDF is 96:2:2.

[0121] 2) Preparation of negative pole piece

[0122] Disperse the negative electrode active material graphite, conductive agent, CMC and SBR in deionized water in a weight ratio of 96:1:1:2 and stir to obtain a negative electrode s...

Embodiment 2～37

[0130] Examples 2 to 37 are used to illustrate the lithium ion battery disclosed in the present invention and the preparation method thereof, including most of the operation steps in Example 1, and the differences are:

[0131] The compaction density of the negative electrode, the added components of the electrolyte and the injection ratio of the electrolyte shown in Table 1 were used.

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Abstract

In order to solve the problem that an existing high-voltage and high-compaction lithium ion battery is insufficient in safety performance, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the negative electrode comprises a negative electrode material layer, the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the non-aqueous electrolyte comprises a negative electrode active material and a negative electrode active material. The positive electrode active material comprises LiCoO2, the non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, the additive comprises a compound represented by a structural formula 1, n is 0 or 1, A is selected from C or O, X is selected from R1 and R2, or R1 and R2 are independently selected from H, or R1 and R2 are not simultaneously selected from H, and X, R1 and R2 at least contain one sulfur atom; the lithium ion battery meets the following conditions: 8% < = a < = 58%, 0.05% < = m < = 5%, and 1.55 g / cm < 3 > < = n < = 1.9 g / cm < 3 >. According to the lithium ion battery provided by the invention, the safety performance of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage battery devices, and in particular relates to a lithium ion battery. Background technique [0002] Due to the advantages of high operating voltage, wide operating temperature range, high energy density and power density, no memory effect and long cycle life, lithium-ion batteries have been widely used in the field of 3C digital products such as mobile phones and notebook computers, as well as in the field of new energy vehicles. Applications. In recent years, with the continuous development of thin and light 3C digital products, the battery industry has higher and higher requirements for high energy density of lithium-ion batteries. At the same time, for the consideration of users, good safety performance has become the basic requirement of batteries. [0003] On the cathode side, LiCoO 2 Among many cathode materials, LiCoO has the highest volumetric energy density and good rate performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235Y02E60/10
Inventor 邓永红钱韫娴刘中波胡时光王勇黄雄
Owner SHENZHEN CAPCHEM TECH CO LTD
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