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Alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, preparation method and application thereof in all-solid-state lithium battery

A technology of alkylsilyllithium and alkylsilyl, which is applied in the field of solid polymer electrolytes, can solve the problems of electrolyte film formation and mechanical properties, high ionic conductivity, and difficulty in commercial application, etc., and achieve excellent long cycle performance, improved safety performance, and low-cost effects

Active Publication Date: 2018-07-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte film formation and mechanical properties are slightly insufficient
[0005] In summary, although all-solid polymer electrolytes have superior advantages and great application prospects, most of the currently reported all-solid polymer electrolytes are difficult to withstand high voltage, high ionic conductivity, good film-forming properties and high mechanical strength. requirements, it is difficult to apply commercially

Method used

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  • Alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, preparation method and application thereof in all-solid-state lithium battery
  • Alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, preparation method and application thereof in all-solid-state lithium battery
  • Alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, preparation method and application thereof in all-solid-state lithium battery

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Effect test

Embodiment 1

[0047] In a glove box, under an inert atmosphere, configure (P1) / LiTFSI in DMSO solution, the polymer accounted for about 15% of the solution mass fraction. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the glass fiber non-woven membrane, set it at 60 o Dry in a C oven for 12 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 12 h, and then placed in a glove box for use.

[0048]

Embodiment 2

[0050] In a glove box, under an inert atmosphere, configure (P2) / LiDFOB in DMF solution, the polymer accounted for about 15% of the solution mass fraction. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the seaweed fiber non-woven membrane, set it at 70 o Dry in a C oven for 10 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 10 h, and then placed in a glove box for use.

[0051]

Embodiment 3

[0053] In a glove box, under an inert atmosphere, configure (P3) / LiDFOB in DMSO solution, the polymer accounted for about 15% of the solution mass fraction. The solution was thoroughly stirred to obtain a clear and transparent viscous liquid. Scrape the above solution evenly on the glass fiber, set it at 80 o Dry in a C oven for 12 h to form a film. After punching, the electrolyte membrane was dried in a vacuum oven for 12 h, and then placed in a glove box for use.

[0054]

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Abstract

The invention relates to an alkyl silicyl lithium battery polymer electrolyte resistant to high voltage, a preparation method and application of the electrolyte in a lithium battery. The electrolyte comprises alkyl silicyl polymers, lithium salt, a porous supporting material and additives. Experiments show that the alkyl silicyl polymer electrolyte material has good film forming property and the mechanical strength is 0.5-300MPa; an electrochemical window of the electrolyte material is higher than 4.3V, and the electrolyte material has good compatibility with a high voltage cathode material; ionic conductivity at room temperature is 1*10<-5>S*cm<-1>-10<-3> S*cm<-1>, and a battery assembled by adopting the electrolyte material has excellent long cycle performance. The alkyl silicyl lithiumbattery polymer provided by the invention can be taken as a high-voltage-resistant electrolyte material. The invention also provides a preparation method of the polymer electrolyte and electrochemicalproperties of an all-solid-state lithium battery assembled by adopting the electrolyte provided by the invention.

Description

technical field [0001] The invention relates to a solid polymer electrolyte, in particular to a high-voltage-resistant alkylsilyl lithium battery polymer electrolyte, a preparation method and its application in an all-solid lithium battery. Background technique [0002] Due to the advantages of high energy density, low cost, and long cycle life, lithium batteries have always been the focus of scientific researchers and entrepreneurs. At present, lithium batteries have been widely used in people's daily life, such as power supply for mobile devices, notebook computers, electric and hybrid vehicles, and smart grids. [0003] At the same time, the development of lithium batteries is also facing huge challenges: First, the current commercial lithium batteries are not safe enough. As we all know, there are two main types of electrolytes used in commercial lithium batteries: one is liquid electrolyte and the other is gel electrolyte. The above two electrolytes have high ionic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/056H01M10/052
CPCH01M10/052H01M10/056H01M10/0565H01M2300/0091H01M2300/0094Y02E60/10
Inventor 崔光磊张焕瑞柴敬超王鹏马君张建军
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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