Non-aqueous electrolyte of lithium ion battery and battery manufactured by using same

A non-aqueous electrolyte, lithium-ion battery technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of unstable film formation, capacity attenuation, etc., to improve high-temperature storage performance, improve wettability, and improve The effect of safety features

Active Publication Date: 2012-01-04
HUIZHOU CAPCHEM CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Among them, the first route uses γBL with high flash point and high boiling point as the solvent. Although it can improve the safety performance, when i

Method used

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  • Non-aqueous electrolyte of lithium ion battery and battery manufactured by using same
  • Non-aqueous electrolyte of lithium ion battery and battery manufactured by using same
  • Non-aqueous electrolyte of lithium ion battery and battery manufactured by using same

Examples

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preparation example Construction

[0033] One. The preparation method of embodiment electrolyte

[0034] in an argon-filled glove box (H 2 O<10ppm), high flash point, high boiling point cyclic carbonate, cyclic carboxylate and cyclic sulfite organic solvent, linear fluoroether, lithium salt, film-forming additive and fluorocarbon surfactant The electrolyte mass ratios listed in each embodiment and comparative example in Table 1 were 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.

[0035] Two. The manufacture method of embodiment lithium-ion battery

[0036] 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.

[0037] The active material constituting the positive electrode can be LiCoO 2 , LiMn 2 o 4 , L...

Embodiment 1

[0075] The production of the positive electrode: the LiCoO 2 , the conductive agent acetylene black and polyvinylidene fluoride are mixed in a weight ratio of 8:1:1, fully dispersed in N-methylpyrrolidone as a solvent to form a paste, and the paste mixture is uniformly coated on a 20 μm as the positive electrode collector Both sides of the strip-shaped aluminum foil of the electric body. The length of the positive electrode sheet is 413 mm, and then dried to obtain a strip-shaped positive electrode sheet with a thickness of 100 um under a pressure of 0.5-2 MPa.

[0076]Preparation of negative electrode: mix natural graphite and polyvinylidene fluoride at a weight ratio of 9:1, disperse the mixture in deionized water solvent to form a paste, and evenly coat the paste mixture on 15um to serve as the negative electrode collector Both sides of the ribbon copper foil. The length of the negative electrode sheet is 420 mm, and then dried to obtain a strip-shaped negative electrode ...

Embodiment 2

[0083] The same as the process of Example 1, the difference is that the electrolyte ratio is:

[0084] γBL:S 1 :PS=50:30:20, 1.4M LiBF 4 , VC: 1%.

[0085] The obtained electrolyte was used for flammability test and battery performance test. The test results of flammability performance, initial performance and 100 cycle capacity retention at room temperature; 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 non-aqueous electrolyte of a lithium ion battery and a lithium ion secondary battery manufactured by using the same. The non-aqueous electrolyte comprises annular carboxylic ester, annular sulfite, electrolyte salt and isoflurane shown in the following structural formula: Rf1-O-Rf2, wherein Rf1 represents a fluorine-containing alkyl group with 3-4 carbon atoms, and Rf2 represents a fluorine-containing alkyl group with 2-5 carbon atoms. The mass percent of the isoflurane in the electrolyte is 10-50%. The non-aqueous electrolyte also comprises fluorocarbon surfactant so as to further improve the battery performance. The non-aqueous electrolyte can greatly improve the safety performance of the lithium ion battery and obviously improve the electrochemical performance such as cycle performance as well as the high-temperature conservation performance of the lithium ion battery.

Description

technical field [0001] The invention relates to an organic composition, in particular 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. 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 ...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 占孝云石桥毛玉华周艾平
Owner HUIZHOU CAPCHEM CHEM CO LTD
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