Lithium ion battery

A lithium-ion battery and carbon number technology, applied in the field of lithium-ion batteries, can solve problems such as poor performance of lithium-ion batteries, improve capacity retention rate and cycle stability, excellent safety performance, and ensure high temperature and normal temperature cycle performance. Effect

Active Publication Date: 2022-05-10
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium ion battery in order to overcome the poor performance of lithium ion batteries using organic / inorganic coated diaphragms in the prior art. In addition to safety performance, it can also significantly improve the cycle performance and fast charging performance of the battery

Method used

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Examples

Experimental program
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Effect test

preparation example 1-7

[0129] Preparation Examples 1-7: Preparation of Compounds

[0130] Under 25 DEG C, the raw material compound A in Table 1 and the raw material compound B were carried out amidation reaction with the molar ratio of 1:1 respectively for 10 hours, and triethylamine was used as the acid-binding agent (the ratio of triethylamine and raw material compound A) in the reaction The molar ratio is 1.5:1), and compound 1, compound 2, compound 3, compound 4, compound 6, compound 7 and compound 12 were prepared by column chromatography purification after the reaction.

[0131] Table 1

[0132]

[0133]

[0134]

[0135]

preparation example 8

[0136] Preparation Example 8: Preparation of PVDF Coated Separator

[0137] PVDF is added in acetone with respect to the amount of 5% by weight of acetone, and is dissolved at 50 ℃ for 12 hours, prepares PVDF slurry; PVDF slurry is coated on the one side of Celgard2400 separator (thickness is 20 μ m), after Dry in an oven at 60° C. for 12 hours, and the thickness of the dried coating is 2 μm.

preparation example 9

[0138] Preparation Example 9: Al 2 o 3 Preparation of coated separators

[0139] PVDF was added in acetone in an amount of 5% by weight relative to acetone, and dissolved at 50° C. for 12 hours to prepare a PVDF mixed solution; the Al 2 o 3 Particles (with a particle size of 0.2 μm) were added to the PVDF mixture, in which Al 2 o 3 The weight ratio of particles to PVDF is 9:1, and Al 2 o 3 slurry; Al 2 o 3 The slurry was coated on one side of a Celgard 2400 separator (20 μm in thickness), and then dried in an oven at 60° C. for 12 h, and the thickness of the dried coating was 2 μm.

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Abstract

The present invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery, the lithium ion battery comprises a positive electrode, a negative electrode, a separator arranged between the positive electrode and the negative electrode, and a non-aqueous electrolyte, the separator comprises a substrate and a coating, the coating is coated on at least one surface of the substrate, and the coating comprises inorganic particles and/or PVDF, the nonaqueous electrolyte solution contains an organic solvent, a lithium salt, and a compound represented by formula (1). According to the lithium ion battery, the diaphragm with the coating is used, so that the safety performance of the battery is ensured, and meanwhile, the cycle performance and the quick charge performance of the battery are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery. Background technique [0002] Due to the advantages of high working voltage, wide working 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 thinner and thinner 3C digital products, the battery industry has higher and higher requirements for high energy density of lithium-ion batteries. Therefore, there is an urgent need to increase the energy density of lithium-ion batteries. [0003] While improving the energy density of lithium-ion batteries, it often brings serious safety problems. Among them, the separator has an important influence on the safety of the ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/451H01M50/457H01M50/446H01M10/0567H01M10/0525H01M10/42H01M10/44
CPCH01M10/0567H01M10/0525H01M10/4235H01M10/446H01M2220/20H01M2220/30H01M50/457H01M50/446H01M50/451H01M10/44H01M10/42H01M50/409Y02E60/10
Inventor 钱韫娴胡时光王勇刘中波
Owner SHENZHEN CAPCHEM TECH
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