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Lithium Ion Battery

A lithium-ion battery and non-aqueous electrolyte technology, applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc., can solve problems such as high temperature storage and rate performance are difficult to balance

Active Publication Date: 2022-05-03
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that existing lithium-ion batteries have difficulty in balancing high-temperature storage and rate performance, the present invention provides a lithium-ion battery

Method used

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Examples

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Embodiment 1

[0156] This embodiment is used to illustrate the lithium-ion battery disclosed in the present invention and its preparation method, including the following steps:

[0157] 1) Preparation of electrolyte: Mix ethylene carbonate (EC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC: EMC=3:7, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L. The contents of the additives in the electrolyte are shown in Table 2, and the contents are calculated as a percentage of the total mass of the electrolyte.

[0158] 2) Preparation of positive plate

[0159] Mix positive electrode active material, conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry, in which the positive electrode The active material is selected from LiCoO doped with structure-stabilizing elements and oxygen-fixing elements 2 , the doping amounts of stable e...

Embodiment 2~40

[0167] Examples 2-40 are used to illustrate the battery disclosed in the present invention and its preparation method, including most of the operation steps in Example 1, the differences are:

[0168] The electrolyte solution shown in Table 2 was used to add the components and the positive electrode material layer.

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Abstract

In order to overcome the problem that existing lithium-ion batteries have difficulty in balancing high-temperature storage and rate performance, the invention provides a lithium-ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, and the positive electrode material layer includes a positive electrode Active material, the positive electrode active material is doped or coated with one or more structurally stable elements of Mg, Al, Zr, W, F, B and one or more of Ti, Cr, Mo and rare earth elements A variety of solid oxygen elements; the non-aqueous electrolyte includes solvents, electrolyte salts and additives, and the additives include compounds shown in structural formula 1: the lithium ion battery described in structural formula 1 satisfies the following conditions: 0.01≤a×b / ( c+d)≤60. The lithium-ion battery provided by the present invention can effectively take into account the improvement of the rate performance and high-temperature storage performance of the battery.

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] In recent years, with the development of new energy vehicles, 3C products and smart mobile terminal products, higher performance requirements have been put forward for lithium-ion batteries. [0003] Nickel-cobalt-manganese cathode material is currently one of the most ideal cathode active materials for lithium-ion batteries for high specific energy batteries. However, the performance of nickel-cobalt-manganese cathode materials cannot meet the requirements of high voltage resistance, long life and high safety, especially in high-temperature environments, rapid charging and discharging, and other working conditions that easily lead to high polarization of battery electrodes. The electrochemical dissolution or structural collapse of the positive electrode material in the liquid contact part wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/42
CPCH01M4/628H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/4235H01M2004/028H01M2004/021Y02E60/10
Inventor 钱韫娴胡时光邓永红王勇向晓霞
Owner SHENZHEN CAPCHEM TECH CO LTD
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