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Non-aqueous electrolyte for lithium ion battery and lithium ion secondary battery

A non-aqueous electrolyte and lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of γBL-based electrolyte capacity attenuation, high-temperature storage performance degradation, etc., achieve excellent high-temperature storage performance and reduce reaction properties, and the effect of improving high-temperature storage performance

Active Publication Date: 2012-07-11
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After a lot of experiments, the inventor found that by adding cyclic sulfuric acid ester and linear fluoroether, the problems of capacity fading and high-temperature storage performance degradation of γBL-based electrolyte can be successfully solved.

Method used

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  • Non-aqueous electrolyte for lithium ion battery and lithium ion secondary battery
  • Non-aqueous electrolyte for lithium ion battery and lithium ion secondary battery
  • Non-aqueous electrolyte for lithium ion battery and lithium ion secondary battery

Examples

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preparation example Construction

[0040] One. The preparation method of embodiment electrolyte

[0041] in an argon-filled glove box (H 2 (0<10ppm), cyclic carbonate, cyclic carboxylate, linear fluoroether, lithium salt, cyclic sulfuric acid ester, film-forming additive and fluorocarbon surfactant are listed according to each embodiment and comparative example of table 1 The electrolyte mass ratio is prepared. 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.

[0042] Two. The manufacture method of embodiment lithium-ion battery

[0043] 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.

[0044] 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-...

Embodiment 1

[0089] in an argon-filled glove box (H 2 O1 = 1:1:1 mixed with lithium hexafluorophosphate (1.2M), the additive is cyclic sulfate A 1 , accounting for 1% of the total weight of the electrolyte. 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 at the 100th cycle of normal temperature cycle; the capacity retention rate, capacity recovery rate and thickness expansion rate after storage at 60°C for 30 days are shown in Table 1.

Embodiment 2

[0091] The same as the process of Example 1, the difference is that the fluoroether is S 2 , the cyclic sulfate is A 2 .

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Abstract

The invention provides non-aqueous electrolyte for a lithium ion battery and a lithium ion secondary battery prepared from the non-aqueous electrolyte. The non-aqueous electrolyte for the lithium ion battery comprises cyclic carboxylic ester and / or cyclic carbonate ester, cyclic sulfate, an electrolyte salt, fluoroether with the following structural formula: Rf1-O-Rf2, and a fluorocarbon surfactant, wherein the Rf1 is a fluorine-containing alkyl group of which the carbon atom number is 3 to 4; the Rf2 is a fluorine-containing alkyl group of which the carbon atom number is 2 to 5; the mass percentage of the fluoroether in the electrolyte is 10 to 50 percent; and the fluorocarbon surfactant is used for further improving the performances of the battery. The high temperature performance and the safety of the lithium ion secondary battery prepared from the non-aqueous electrolyte can be kept at a higher level as a whole, and the cycling performance is improved.

Description

technical field [0001] The invention relates to a lithium-ion battery non-aqueous electrolyte and a lithium-ion secondary 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. Lithium-ion battery electrolyte system, as an important part of lithium-ion batteries, is a key material necessary for lithium-ion batteries, and its performance is a great constraint on the development of lithium-ion batteries. At present, the electrolyte of lithium-ion batteries is composed of flammable organic solvents and lithium...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 石桥占孝云毛玉华周艾平
Owner SHENZHEN CAPCHEM TECH
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