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Preparation and application of block polymer electrolyte

A block polymer and electrolyte technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of affecting lithium ion transmission, low electrochemical stability window, etc., achieve shape diversification, improve interface performance, The effect of small product shrinkage

Inactive Publication Date: 2018-11-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the porous support material is an inert inorganic material, which will affect the transport of lithium ions, and has a low electrochemical stability window.

Method used

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  • Preparation and application of block polymer electrolyte
  • Preparation and application of block polymer electrolyte
  • Preparation and application of block polymer electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to the ratio of R to 1.2, mix and stir 1mmol HDI trimer, 1.25mmol PEG (Mw=800), 4ml acetonitrile and tetraethylene glycol dimethyl ether (TEGDME) (V:V=1:1); add 1g lithium hexafluorophosphate (LiPF 6 ) were mixed evenly to prepare a transparent and clear electrolyte; 0.1 g of dibutyltin dilaurate was added dropwise and stirred evenly; the evenly stirred composite polymer electrolyte was scraped onto a polytetrafluoroethylene mold, and heated to 60°C in a glove box, Cured for 12 hours to form a film.

Embodiment 2

[0030] According to the ratio of R to 0.8, mix 1mmol HDI trimer, 1.875mmol PEG (Mw=1500), 4ml tetraethylene glycol dimethyl ether (TEGDME) and 1-methyl-2 pyrrolidone (V:V=1:1) Mix and stir; add 2g LiN(C 2 f 5 SO 2 ) 2 Mix evenly to prepare a transparent and clear electrolyte; add 0.15g of dibutyltin dilaurate dropwise and stir evenly; scrape the evenly stirred composite polymer electrolyte onto a polytetrafluoroethylene mold, heat it to 60°C in a glove box, and cure 12 hours film formation.

Embodiment 3

[0032] According to the ratio of R to 1, mix and stir 1mmol HDI, 1mmol EG and 4ml tetraethylene glycol dimethyl ether evenly; add 2g LiBOB and mix evenly to prepare a transparent and clear electrolyte; dropwise add 0.08g bis(acetylacetonate) dibutyltin Stir evenly; scrape-coat the evenly stirred composite polymer electrolyte onto a polytetrafluoroethylene mold, heat to 60°C in a glove box, and cure for 12 hours to form a film.

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Abstract

The invention discloses preparation and application of a block polymer electrolyte and relates to the technical field of electrolytes for lithium-ion batteries. Block polymerization is carried out through a chemical method to prepare the block polymer electrolyte with different soft-hard segment ratios. A rigid isocyanate group molecular chain compound is built to improve the mechanical property and the thermal stability of the block polymer electrolyte as a skeleton and to provide certain ion channels; and a flexible hydroxyl group molecular chain compound is capable of improving the ion conductivity and the ion migration number of the polymer electrolyte to improve the charge-discharge performance of a solid-state lithium-ion battery as a main ion channel of the block polymer electrolyte, and is also capable of improving the interface property of the solid-state lithium-ion battery. The block polymer electrolyte has the advantages of high interface stability, a wide electrochemical window, a wide operating temperature range and high room-temperature ion conductivity; and a product is small in shrinkage rate, diverse in shape and suitable for a lithium-ion polymer battery.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to the preparation of a block polymer electrolyte and its application in solid-state lithium ions. Background technique [0002] In recent years, the application of commercial lithium-ion battery systems has become more extensive and in-depth. However, most commercial batteries use conventional organic liquid electrolytes. Because organic electrolytes usually have defects such as high chemical activity, volatility, and flammability, a series of safety problems such as corrosion, pollution, and explosion occur in batteries. In addition, when metal lithium is used as the negative electrode, lithium dendrites will be formed on the surface of the metal electrode as the lithium ions are intercalated and extracted during the operation of the battery in the liquid electrolyte. On the one hand, the formation of lithium dendrites will cause the appearance of dead li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/058C08G18/76C08G18/73C08G18/64C08G18/48C08G18/32
CPCC08G18/3206C08G18/4825C08G18/6438C08G18/73C08G18/7614C08G18/7671H01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 尉海军林志远郭现伟侯文茹
Owner BEIJING UNIV OF TECH
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