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Lithium ion battery

A lithium-ion battery, non-aqueous electrolyte technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high temperature storage and rate performance difficult to balance

Active Publication Date: 2022-02-18
SHENZHEN CAPCHEM TECH
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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

[0147] This embodiment is used to illustrate the lithium-ion battery disclosed in the present invention and its preparation method, including the following steps:

[0148] 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.

[0149] 2) Preparation of positive plate

[0150] 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

[0158] 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:

[0159] 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 solve the problem that a high-temperature storage and rate capability of an existing lithium ion battery is difficult to consider at the same time, the invention provides a lithium ion battery which comprises a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte. The positive electrode material layer comprises 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 and B and one or more solid oxygen elements of Ti, Cr, Mo and rare earth elements; and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound as shown in a structural formula 1, and the lithium ion battery with the structural formula 1 meets the following condition: a * b / (c + d) is greater than or equal to 0.01 and less than or equal to 60. According to the lithium ion battery provided by the invention, the rate capability and the high-temperature storage performance of the battery can be 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] 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, etc. The electrochemical dissolution or structural collapse of the positive electrode material in the liquid contact part will eventually lead to the loss of charge and discharge activity of the positive elect...

Claims

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Application Information

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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
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