Solid electrolyte membrane as well as preparation process and application thereof

A solid electrolyte membrane and polymer technology, applied in the manufacture of electrolyte batteries, electrolytes, non-aqueous electrolyte batteries, etc., can solve the problems of easy agglomeration of inorganic fillers, poor contact wettability, weak interaction, etc., to reduce the agglomeration effect and interface. The effect of low impedance and strong mechanical properties

Inactive Publication Date: 2019-09-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high crystallinity of the polymer matrix, the conductivity at room temperature is very low (about 10 -6 ~10 -7 S/cm) limits its practical application
Inorganic solid electrolyte has high room temp

Method used

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  • Solid electrolyte membrane as well as preparation process and application thereof
  • Solid electrolyte membrane as well as preparation process and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a method for preparing a solid electrolyte membrane, and the specific preparation steps are as follows:

[0027] (1) 2g nano-SiO 2 Disperse into a three-necked flask filled with a mixed solution of absolute ethanol and distilled water with a volume ratio of 3:1, and disperse ultrasonically for 0.5 h; place the three-necked flask in a constant temperature oil bath, keep magnetic stirring in a nitrogen protective atmosphere, and heat up to After 80°C, add 0.2g of KH-560, and continue magnetic stirring at reflux temperature to make it fully react; after the reaction solution is centrifuged at high speed, use ethanol / distilled water to wash alternately for 2~3 times, and vacuum dry at 50°C for 8h to obtain the mass percentage 10% modified nano-SiO 2 , denoted as SiO 2 -KH560.

[0028] (2) Dissolve 3gPEO and 0.9gLITFSI in 40~70g of acetonitrile solvent, stir magnetically for 10h to obtain a mixed solution; add 0.18g of modified nano-SiO to the mix...

Embodiment 2

[0032] In this embodiment, a polymer solid electrolyte is used as the electrolyte of a high-performance all-solid-state lithium-ion secondary battery, and graphite is used as the positive electrode to prepare the battery. The specific preparation steps are as follows:

[0033] (1) Add 2gAl 2 o 3 Disperse into a three-necked flask filled with anhydrous ethanol and distilled water at a volume ratio of 3:1, and disperse ultrasonically for 0.5h; place the three-necked flask in a constant temperature oil bath, keep magnetic stirring in a nitrogen protective atmosphere, and heat up to 80°C Finally, add 0.4g of KH-570, and continue magnetic stirring at the reflux temperature to make it fully react; after the reaction solution is centrifuged at high speed, use ethanol / distilled water to wash alternately for 2~3 times, and vacuum dry at 50°C for 8h to obtain a mass percentage of 20 % modified Al 2 o 3 , denoted as Al 2 o 3 -KH570.

[0034] (2) Dissolve 3gPEO and 0.9gLiBOB in 40~7...

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Abstract

The invention discloses a solid electrolyte membrane as well as a preparation process and an application thereof. The solid electrolyte membrane is prepared from a polymer matrix, a modified inorganicfiller and a lithium salt. The inorganic filler is modified, so that the agglomeration effect of the inorganic filler in an organic solvent can be effectively reduced, and the inorganic solid polymerelectrolyte membrane with high dispersibility is obtained. The surface of the inorganic filler is grafted with a silane coupling agent through covalent bonds, so that the interaction between the polymer matrix and the inorganic filler can be enhanced, the interface affinity between the polymer electrolyte thin film and the electrode material is improved, and the inorganic solid polymer electrolyte membrane which is high in electrical conductivity, low in interface impedance, strong in mechanical property and the like can be obtained. The preparation method has the advantages that materials are easy to obtain, the preparation process is simple, the obtained inorganic solid state polymer electrolyte membrane is excellent in performance, and large-scale preparation is facilitated.

Description

technical field [0001] The invention belongs to the technical field of all-solid lithium batteries, and relates to a solid polymer electrolyte film and its preparation process and application. Background technique [0002] As a key material of lithium-ion batteries, electrolyte affects and even determines various macroscopic electrochemical properties such as specific energy, life, safety performance, charge and discharge performance, and high and low temperature performance of the battery. The current electrolyte has developed from the previous liquid electrolyte to the solid electrolyte. Replacing liquid electrolyte with solid electrolyte is a major progress in the development of lithium-ion batteries. Its notable feature is that it improves the safety performance of the battery, is easy to process into a film, and can be made into an all-plastic structure, so that ultra-thin and various shapes can be manufactured. Battery: It can well adapt to the volume change of the el...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0091Y02E60/10Y02P70/50
Inventor 高云智付会珍付传凯吴李斌赵伟徐延铭
Owner HARBIN INST OF TECH
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