All solid state electrolyte and preparing method and application of the same

An all-solid-state, electrolyte technology, used in batteries with solid electrolytes, non-aqueous electrolyte batteries, batteries with organic electrolytes, etc., can solve the problems of difficult molding, leakage, poor mechanical properties of gel polymer electrolytes, etc., and achieve mechanical properties. Excellent, easy to form, easy to cut effect

Inactive Publication Date: 2008-05-21
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the liquid electrolyte is volatile and leaks in the existing lithium-ion secondary battery, or the gel polymer electrolyte has poor mechanical properties and is difficult to form, and provides a fully Solid electrolyte and its preparation method and application

Method used

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Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0015] Embodiment 1: The all-solid electrolyte of this embodiment is composed of lithium salt, polyethylene oxide (PEO) and superfine powder filler, wherein the EO group (CH 2 -CH 2 The molar ratio of -O) to the lithium salt is 2 to 20:1, and the mass ratio of the superfine powder filler to the lithium salt is 1:1 to 15.

[0016] In the present embodiment, the superfine powder filler is nano hectorite, nano Al 2 o 3 , Nano TiO 2 , Nano ZrO 2 , nano-SiO 2 or nanoclays. The lithium salt is lithium perchlorate (LiClO 4 ), lithium trifluoromethanesulfonate (LiCF 3 SO 3 ), lithium hexafluorophosphate (LiPF 6 ) or a mixture of several of them; when the lithium salt is a mixture, the various lithium salts are mixed in any ratio.

specific Embodiment approach 2

[0017] Embodiment 2: In this embodiment, the particle size of the superfine powder filler is 1 nm to 500 nm. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: In this embodiment, the particle size of the superfine powder filler is 10-400 nm. Others are the same as in the first embodiment.

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Abstract

The invention relates to an all-solid-state electrolyte, the preparation method and the application, which solves the problems that the liquid state electrolytet in the prior lithium ion secondary battery is easy to volatilize and has the leakage potential safety hazard, or the gel polymer electrolyte has a bad mechanical property and molding difficulty. The invention comprises lithium salt, polyethylene oxide, ultra fine powder packing. The invention prepares the all-solid-state electrolyte through the method that: firstly, the lithium salt and the solvent are mixed evenly and then the PEO powder is scattered in and mixed evenly; secondly, the ultra fine powder packing is added into the solvent and mixed evenly, and the mixture is stood; thirdly, the mixed liquids of the first step and the second step are mixed evenly, molded after being cast and dried, and then demoulded to form the product. The invention has the advantages that the all-solid-state electrolyte is used as the electrolyte of the all-solid-state secondary lithium battery and matches with the cathode of the metal lithium; thus the potential safety hazard of the liquid state electrolyte leakage is avoided, the mechanical property is good and the molding is easy.

Description

technical field [0001] The invention relates to an electrolyte, its preparation method and application. Background technique [0002] Currently widely used lithium-ion secondary batteries have the following disadvantages: [0003] 1. Use liquid electrolyte (for example: LiPF 6 -EC-DEC liquid electrolyte) is volatile, and the electrolyte is easy to leak from the battery, posing unsafe risks. At the same time, batteries using liquid electrolytes also have potential safety hazards at high temperatures. [0004] Second, use a gel polymer electrolyte (for example: LiClO 4 / EC-PC-PAN gel polymer electrolyte) has poor mechanical properties and is difficult to mold. Contents of the invention [0005] The purpose of the present invention is to solve the problem that the liquid electrolyte is volatile and leaks in the existing lithium ion secondary battery, or the gel polymer electrolyte has poor mechanical properties and is difficult to form, and provides a fully Solid electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/02H01M10/40H01M4/48H01M4/58H01M4/38H01M6/02H01M6/18H01M6/16H01M10/0525H01M10/056
CPCY02E60/122Y02E60/10
Inventor 顾大明杨柳王淑堂
Owner HARBIN INST OF TECH
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