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Lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of power drop of lithium iron phosphate battery

Pending Publication Date: 2022-05-06
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of power drop in the long-term cycle of the existing lithium iron phosphate battery, the invention provides a lithium ion battery

Method used

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Examples

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Embodiment 1

[0135] This embodiment is used to illustrate the lithium-ion battery disclosed in the present invention and its preparation method, including the following steps:

[0136] 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, and then add the additives in Table 1 respectively. The amount of the additive is calculated based on the percentage of the total mass of the electrolyte.

[0137] 2) Preparation of positive plate

[0138] Mix the positive electrode active material carbon-coated lithium iron phosphate, conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain the positive electrode The slurry, wherein the amount of carbon-coated lithium iron phosphate added and the carbon content of the positive electrode material layer are ...

Embodiment 2～34

[0146] Examples 2-34 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:

[0147] The electrolyte solution shown in Table 1 was used to add the components and the positive electrode material layer.

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Abstract

In order to solve the problem of power reduction in long-term circulation of the existing lithium iron phosphate battery, the invention provides a lithium ion battery which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, and the negative electrode comprises a negative electrode material layer containing a negative electrode active material; the positive electrode active material comprises a lithium iron phosphate composite material consisting of lithium iron phosphate and a carbon coating layer coated on the surface of the lithium iron phosphate, 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 vinylene carbonate; and the lithium ion battery meets the following condition: (W1 / W2) * (Ma + Mb) / 100 is more than or equal to 0.1 and less than or equal to 4. According to the lithium ion battery provided by the invention, a relatively stable passive film is formed on the positive electrode material layer, so that the side reaction of the non-aqueous electrolyte on the surface of the positive electrode active material with strong oxidizing property can be inhibited, and the cycle performance is 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 popularization of new energy vehicles and 3C consumer goods on a larger scale, people have higher and higher requirements for lithium-ion batteries in terms of high energy density, high rate charge and discharge, long life, and high safety. Compared with the ternary battery system, the lithium iron phosphate battery has obvious advantages in terms of safety, manufacturing cost, and cycle life. However, in the actual use of lithium iron phosphate, there are problems of low conductivity and ion mobility, which limit the further improvement of its performance. In recent years, in order to improve the electrical properties of lithium iron phosphate materials, carbon is placed on the surface of lithium iron phosphate active particles Coating is considered as a modificatio...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525H01M10/0567
CPCH01M4/366H01M4/5825H01M4/583H01M10/0567H01M10/0525H01M2004/028H01M2300/0025Y02E60/10
Inventor 钱韫娴胡时光邓永红李红梅向晓霞
Owner SHENZHEN CAPCHEM TECH
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