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Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of unsatisfactory high-temperature storage performance and cycle performance of batteries, electrolyte gas swelling, and potential safety hazards, and achieve improvement Effects of high temperature storage performance and cycle performance

Inactive Publication Date: 2013-06-12
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the batteries in the above-mentioned patents are still not ideal in terms of high-temperature storage performance and cycle performance, and the decomposition of the electrolyte will still occur at higher temperatures, resulting in gas swelling, which will bring serious safety hazards. Therefore, it is necessary to develop new batteries. Additives to further improve high-temperature storage performance of lithium-ion batteries

Method used

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  • Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery
  • Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery
  • Non-aqueous electrolyte solution for lithium ion battery and corresponding lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Preparation of electrolyte

[0036] Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=1:1:1, and then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1mol / L, and then add 0.5% of compound 1 based on the total mass of the electrolyte (compound 1, compound 2 referred to in the specific embodiment refers to the corresponding numbers listed in Table 1 Compound, the phosphate ester compound shown in the following examples).

[0037] 2) Preparation of positive plate

[0038] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 , 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. The slurry is uniformly coated on both sides of the aluminum foil, dried, calendered a...

Embodiment 2

[0055] Except that 0.5% of compound 1 was replaced by 0.5% of compound 2 in the preparation of the electrolyte, the others were the same as in Example 1. The data of normal temperature cycle, high temperature cycle and high temperature storage obtained from the test are shown in Table 2.

Embodiment 3

[0057] Except that 0.5% of compound 1 was replaced by 0.5% of compound 5 in the preparation of the electrolyte, the others were the same as in Example 1, and the data of normal temperature cycle, high temperature cycle and high temperature storage obtained from the test are shown in Table 2.

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Abstract

The invention aims to provide a high performance non-aqueous electrolyte solution used for a lithium ion battery. The non-aqueous electrolyte solution includes: a lithium salt; an organic solvent; and an unsaturated phosphate compound. The unsaturated phosphate compound is in favor of forming a stable and compact passivation film (SEI (solid electrolyte interface)) on an electrode surface so as to prevent further decomposition of solvent molecules. The electrolyte solution obtained according to the scheme involved in the invention can improve the high-temperature storage performance and cycle performance of the battery.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to the field of lithium ion secondary batteries. Background technique [0002] Portable electronic products such as cameras, digital video cameras, mobile phones, notebook computers, etc. are widely used in people's daily life. With the development of science and technology and market demand, higher requirements are put forward for the volume, weight, function and service life of portable electronic products. Therefore, it is an urgent need for the development of the industry to develop power supply products that are compatible with portable electronic products, especially to develop secondary batteries with high energy density, long life and high safety. [0003] Compared with lead-acid batteries, nickel-cadmium batteries, and nickel-metal hydride batteries, lithium-ion batteries are widely used in portable electronic products because of their high energy density, high operating vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/10
Inventor 石桥胡时光
Owner SHENZHEN CAPCHEM TECH CO LTD
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