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Single ion conductor polymer electrolyte and preparation method and application thereof

A conductive polymer, single-ion technology, applied in the field of electrolytes, can solve the problems of low lithium ion migration number, affecting the cycle life of lithium ion batteries, etc., to improve the migration number, solve the problem of concentration polarization, Coulomb efficiency and cycle performance improved effect

Pending Publication Date: 2022-03-18
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most polymer matrices are similar to liquid electrolytes and are dual ion conductors with low lithium ion migration numbers (t Li + <0.5), in the process of charge and discharge, anions gather on the surface of the positive electrode to cause concentration polarization, which affects the cycle life of lithium-ion batteries

Method used

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  • Single ion conductor polymer electrolyte and preparation method and application thereof
  • Single ion conductor polymer electrolyte and preparation method and application thereof
  • Single ion conductor polymer electrolyte and preparation method and application thereof

Examples

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preparation example 1

[0062] A kind of single ion conductor, its preparation method comprises the steps:

[0063] (1) At 70°C, SiO with a mass ratio of 1:5 2 React with methanesulfonyl chloride in toluene for 10h to obtain a schematic diagram such as figure 1 The indicated sulfonyl chloride modified inorganic filler;

[0064] (2) The modified SiO obtained in the step (A1) with a mass ratio of 1:5 2 Reaction in acetonitrile with lithium bistrifluoromethanesulfonylimide for 20h, the schematic diagram is obtained as figure 2 Single-ion conductors of lithium trifluoromethane bissulfonylimide modified inorganic fillers shown.

preparation example 2

[0066] A kind of single ion conductor, its preparation method comprises the steps:

[0067] (1) At 60°C, react halloysite and methanesulfonyl chloride with a mass ratio of 1:2 in toluene for 12 hours to obtain modified halloysite;

[0068] (2) reacting the modified halloysite obtained in the step (A1) with a mass ratio of 1:2 and lithium bistrifluoromethanesulfonimide together in acetonitrile for 24 hours to obtain the single ion conductor.

preparation example 3

[0070] A kind of single ion conductor, its preparation method comprises the steps:

[0071] (1) At 80°C, react kaolinite and methanesulfonyl chloride with a mass ratio of 1:10 in toluene for 8 hours to obtain modified kaolinite;

[0072] (2) reacting the modified kaolinite obtained in the step (A1) with a mass ratio of 1:10 and lithium bistrifluoromethanesulfonimide together in acetonitrile for 12 hours to obtain the single ion conductor.

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Abstract

The invention provides a single-ion conductor polymer electrolyte as well as a preparation method and application thereof. The single-ion conductor polymer electrolyte comprises a combination of a single-ion conductor, an oxide solid electrolyte and a polymer matrix, the single-ion conductor comprises an inorganic filler and lithium bis (trifluoromethane sulfonimide) grafted on the surface of the inorganic filler through sulfonyl chloride; the bistrifluoromethanesulfonimide is grafted on an inorganic filler framework to limit migration of anions in the inorganic filler framework, so that the problem of concentration polarization of the anions can be effectively solved, and further, the migration number of lithium ions in the electrolyte can be increased; and finally, the electrical property of the lithium ion solid-state battery containing the single-ion conductor polymer electrolyte is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of electrolytes, and in particular relates to a single ion conductor polymer electrolyte and its preparation method and application. Background technique [0002] Lithium-ion batteries are widely used due to their environmental friendliness and excellent cycle performance. As a key component of lithium-ion batteries, electrolytes are closely related to their cycle life, safety, and capacity. At present, organic liquid electrolytes are the most widely used in the market, but they are prone to problems such as leakage of organic solvents, combustion and explosion, and there are great safety hazards. Therefore, solid electrolytes have become a hot research topic. [0003] Solid electrolytes mainly include inorganic solid electrolytes, polymer solid electrolytes and organic / inorganic composite solid electrolytes. For the research on all-solid-state lithium secondary batteries, it mainly includes two categories ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0565H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 董洁陈规伟冀亚娟
Owner EVE ENERGY CO LTD
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