Lithium ion battery

A lithium-ion battery and battery positive electrode technology, applied in the field of lithium-ion batteries, can solve the problems of battery formation and gas production

Pending Publication Date: 2021-07-16
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a lithium-ion battery for the problem that the mass fraction of the nickel element in the existing positive electrode active material is greater than or equal to 30%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Preparation of non-aqueous electrolyte

[0077] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=3:5:2, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1 mol / L, then add 1% of compound 1 and 0.5% of compound 10 based on the total mass of the non-aqueous electrolyte shown in Table 1.

[0078] 2) Preparation of positive plate

[0079] Mix positive electrode active material lithium nickel cobalt manganese oxide by the mass ratio of 93:4:3 to obtain the active material that nickel element mass accounts for the total mass percentage of active material is 48%, is recorded as Ni48 (48 represents mass percentage, the same below), conductive Carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then they are mixed and dispersed in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The positive electrode slurry is evenly coated on both si...

Embodiment 2～4

[0089] Identical with the technology of embodiment 1, difference is:

[0090] In the preparation step of the non-aqueous electrolytic solution, the total mass of the non-aqueous electrolytic solution is 100%, and the non-aqueous electrolytic solution is added with the mass percentage content shown in Example 2 to Example 4 in Table 1. components.

Embodiment 5～7

[0092] Identical with the technology of embodiment 1, difference is:

[0093] In the preparation step of the non-aqueous electrolytic solution, the total mass of the non-aqueous electrolytic solution is 100%, and the non-aqueous electrolytic solution is added with the mass percentage content shown in Example 5 to Example 7 in Table 1. components.

[0094] In the preparation step of the positive electrode plate, in the positive electrode active material, the nickel element accounts for 41% of the total mass percentage of the active material, which is recorded as Ni41.

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Abstract

The invention belongs to the technical field of new energy, and particularly relates to a lithium ion battery, which comprises a battery positive electrode, a battery negative electrode, a diaphragm arranged between the battery positive electrode and the battery negative electrode and a non-aqueous electrolytic solution, wherein the battery positive electrode comprises a positive electrode active material, the mass fraction of the nickel element in the active material is greater than or equal to 30%, and the non-aqueous electrolytic solution comprises compounds as shown in a structural formula 1 and a structural formula 2. According to the invention, the compounds represented by the structural formula 1 and the structural formula 2 are added to the non-aqueous electrolytic solution in the embodiment of the invention at the same time and are combined to react in the battery formation process, so that the generation of olefin gases is inhibited, combined products with relatively large impedance are reduced, and the high-temperature storage and high-temperature cycle performance of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of new energy sources, and in particular relates to a lithium ion battery. Background technique [0002] Lithium-ion batteries have become one of the ways to replace fossil fuels such as petroleum to provide energy due to their high operating voltage, long life, no memory effect, and cleanliness. Recently, with the support of policies and the advancement of technology, the new energy vehicle industry with lithium-ion batteries as the power source has developed by leaps and bounds, and with a series of restrictions on fuel vehicles in Europe, lithium-ion batteries have The power supply system for new energy vehicles has great application prospects. The battery system based on the lithium cobalt oxide system has achieved considerable and stable development in the field of portable electronic products such as mobile phones and computers. In the field of new energy power vehicles, lithium-ion power batteries b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235H01M10/42Y02P70/50Y02E60/10
Inventor 钱韫娴员晓刚邓永红胡时光李红梅
Owner SHENZHEN CAPCHEM TECH CO LTD
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