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Flame retardant type non-aqueous electrolyte solution and battery thereof

A non-aqueous electrolyte and flame-retardant technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems such as the flammability of lithium-ion batteries that have not been effectively solved, achieve excellent battery characteristics, improve safety performance, and improve The effect of battery safety

Inactive Publication Date: 2012-01-04
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the above-mentioned technical solutions have not effectively solved the flammability problem of lithium-ion batteries

Method used

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  • Flame retardant type non-aqueous electrolyte solution and battery thereof
  • Flame retardant type non-aqueous electrolyte solution and battery thereof
  • Flame retardant type non-aqueous electrolyte solution and battery thereof

Examples

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Effect test

preparation example Construction

[0029] One. The preparation method of embodiment electrolyte

[0030] in an argon-filled glove box (H 2 (0<10ppm), with cyclic carbonate, cyclic carboxylate, linear fluoroether, lithium salt, film-forming additive and fluorocarbon surfactant according to the electrolyte mass ratio listed in each embodiment and comparative example of table 1 Prepare. The above-mentioned raw materials are added in sequence and fully stirred evenly to obtain the lithium-ion battery electrolyte of the present invention, which is used for flammability test and battery performance test.

[0031] Two. The manufacture method of embodiment lithium-ion battery

[0032] The non-aqueous electrolyte secondary battery of the present invention is composed of the above-mentioned non-aqueous electrolyte, a negative electrode and a positive electrode.

[0033] The active material constituting the positive electrode can be LiCoO 2 , LiMn 2 o 4 , LiNi 1-x-y co x mn y o 2 (01-x co x o 2 (04 Wait.

[0...

Embodiment 1

[0094] in an argon-filled glove box (H 2 O1 = 1:1:1 mixed with lithium hexafluorophosphate (1.2M), the additive is fluorocarbon surfactant A 1.1 , accounting for 0.5% of the total weight. The above-mentioned raw materials are added in sequence, fully stirred evenly, and the lithium-ion battery electrolyte solution (free acid<30ppm, moisture<10ppm) of the present invention is obtained. Electrolyte is used for flammability test and battery performance test. The test results of flammability and the capacity retention rate after 150 cycles of normal temperature cycle; the capacity retention rate, capacity recovery rate and thickness expansion rate after high temperature storage are shown in Table 1.

Embodiment 2

[0096] The same as the process of Example 1, the difference is that the electrolyte ratio is: EC: PC: S 1 =1:1:1, 1.2M LiPF 6 , A 1.1 : 0.5%. The test results of flammability and the capacity retention rate after 150 cycles of normal temperature cycle; the capacity retention rate, capacity recovery rate and thickness expansion rate after high temperature storage are shown in Table 1.

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Abstract

The invention relates to an organic composition, in particular to a flame retardant type non-aqueous electrolyte solution and a lithium ion battery prepared by the electrolyte solution. The flame retardant type non-aqueous electrolyte solution comprises electrolyte salt, a non-aqueous solvent, 10 to 50 mass percent of flame retardant and 0.001 to 2 mass percent of surfactant, wherein the non-aqueous solvent comprises cyclic carbonic ester and / or cyclic carboxylic ester; the flame retardant comprises an isoflurane organic matter; and the surfactant comprises fluorocarbon surfactant. The electrolyte solution can greatly improve the safety performance of the lithium ion battery; simultaneously, the electrochemistry performance such as cycle performance and high-temperature preservation performance of the lithium ion battery can be obviously improved.

Description

technical field [0001] The invention relates to an organic composition, in particular to a flame-retardant non-aqueous electrolyte and a lithium ion battery made thereof. Background technique [0002] Lithium-ion battery is the most competitive battery of the new generation, known as "green energy", and is the preferred technology to solve contemporary environmental pollution and energy problems. In recent years, lithium-ion batteries have achieved great success in the field of high-energy batteries, but consumers still expect batteries with higher comprehensive performance, which depends on the research and development of new electrode materials and electrolyte systems. As an important part of lithium-ion batteries, the electrolyte system of lithium-ion batteries is a key material necessary for lithium-ion batteries. Its performance greatly restricts the development of lithium-ion batteries. At present, the electrolyte of lithium-ion batteries is composed of flammable orga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 占孝云石桥毛玉华孙先保王希敏
Owner SHENZHEN CAPCHEM TECH CO LTD
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