Lithium ion battery

A lithium-ion battery, carbon number technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor performance of lithium-ion batteries

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

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor performance of lithium-ion batteries with high-nickel ternary positive electrode active materials in the prior art, and to provide a lithium-ion battery that can significantly improve the chemical performance of the lithium-ion battery during cycling and storage at high temperatures. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-7

[0120] 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 in the reaction (triethylamine and the raw material compound A 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.

[0121] Table 1

[0122]

[0123]

[0124]

Embodiment 1

[0135] 1) Preparation of electrolyte

[0136] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, and then adding compound 1 of 0.001% by weight of the total mass of the electrolyte;

[0137] 2) Preparation of positive electrode

[0138] The cathode active material LiNi 0.8 co 0.1 mn0.1 o 2 , the conductive agent conductive carbon black Super-P, carbon nanotubes (CNT) and the binder polyvinylidene fluoride (PVDF) are uniformly mixed according to the weight ratio of 96.5:1.5:0.5:1.5, and then they are dispersed in N-formaldehyde base-2-pyrrolidone (NMP) to obtain the positive electrode slurry; apply the positive electrode slurry evenly on both sides of the aluminum foil, dry, calender and vacuum dry, and use an ultrasonic welder to weld the aluminum lead wire to obtain the positive electrode , the thickness o...

Embodiment 2-19 and comparative example 1-3

[0147] Carry out according to the method for embodiment 1, difference is:

[0148] The types of positive active materials in the positive electrode of lithium-ion batteries are different;

[0149] The content of PVDF is different (when the content of PVDF in the positive electrode material increases, the amount of positive electrode active material is reduced in a corresponding proportion, and when the content of PVDF decreases, the amount of positive electrode active material is increased in a corresponding proportion);

[0150] The type and content of the compound represented by the formula (1) added to the electrolytic solution differ.

[0151] The details are shown in Table 2-4.

[0152] The results of Examples 1-19 and Comparative Examples 1-3 are shown in Table 2-4.

[0153] Table 2

[0154]

[0155] Note: % of compound content and PVDF content are all weight %; / means no corresponding substance added.

[0156] According to the comparison of the results of Exampl...

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Abstract

The 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 diaphragm arranged between the positive electrode and the negative electrode and a non-aqueous electrolyte, a positive electrode material of the positive electrode contains a positive electrode active material LiNixCoyMzO2, M is selected from Mn and / or Al, 0.5 < = x < = 1, 0 < = y < = 0.5, 0 < = z < = 0.5, and x + y + z < = 1; 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 chemical performance during circulation and storage at high temperature can be 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] Since the first commercialization of lithium-ion batteries (LIBs) in 1991, lithium-ion batteries have rapidly occupied the mainstream market, become an integral part of modern society, and greatly affect our lives. In order to design a lithium-ion battery with higher energy density, increasing the nickel content of the ternary cathode is one of the important ways to increase the energy density of the battery. High-nickel ternary batteries have great advantages in energy density, and are currently one of the most mature application materials for high-energy-density industrialization. In addition, the content of cobalt in high-nickel ternary active materials is low, which can alleviate the dependence of power batteries on cobalt to a certain extent. Therefore, high-nickel ternary active materials with high energy d...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025H01M10/42Y02E60/10
Inventor 钱韫娴胡时光刘伟新员晓刚林木崇
Owner SHENZHEN CAPCHEM TECH
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