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A kind of preparation method of solid electrolyte membrane with high lithium ion migration number

A technology of solid electrolyte membrane and ion transfer number, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve the problems of poor battery performance, poor lithium ion transfer number of polyvinylidene fluoride-based electrolyte, etc., and achieve fast film formation , Improving the difficulty of lithium ion migration and improving the effect of thermal stability

Active Publication Date: 2022-07-12
HARBIN UNIV OF SCI & TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of poor lithium ion migration number and poor battery performance of the polyvinylidene fluoride based electrolyte prepared by the existing method, and propose a method for preparing a solid electrolyte membrane with a high lithium ion migration number

Method used

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  • A kind of preparation method of solid electrolyte membrane with high lithium ion migration number
  • A kind of preparation method of solid electrolyte membrane with high lithium ion migration number
  • A kind of preparation method of solid electrolyte membrane with high lithium ion migration number

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specific Embodiment approach 1

[0028] Embodiment 1: The preparation method of a solid electrolyte membrane with a high lithium ion migration number in this embodiment is carried out according to the following steps:

[0029] 1. Pretreatment of raw materials

[0030] 0.25g of polyvinylidene fluoride, 0.0278g of hydroxypropyl methylcellulose, 0.0075g of stearic acid and 0.20g of lithium bis-trifluoromethanesulfonimide were heated at a temperature of 80 ° C for 10 h under vacuum conditions. use;

[0031] 2. Preparation of raw material slurry

[0032] a. Add the polyvinylidene fluoride and hydroxypropyl methylcellulose pretreated in step 1 into the weighing bottle, add 3ml N,N-dimethylformamide, heat and stir in a water bath at 60°C for 3h to make them fully dissolve;

[0033] b. Add the pretreated stearic acid in step 1 into a weighing bottle, add 1 ml of N,N-dimethylformamide, ultrasonicate for 15 minutes, and continue stirring for 3 hours;

[0034] 3. Mix slurry to remove air bubbles

[0035] Mix the tw...

specific Embodiment approach 2

[0042] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the pretreatment method described in step 1 is heating at a temperature of 80° C. for 10 hours under vacuum conditions. Others are the same as the first embodiment.

specific Embodiment approach 3

[0043] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the solvent used in Step 2 is N,N-dimethylacetamide. Others are the same as in the first or second embodiment.

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Abstract

A preparation method of a solid electrolyte membrane with high lithium ion migration number relates to a method for preparing a solid electrolyte of a lithium ion battery. The invention aims to solve the problems of low safety and low lithium ion migration number for preparing a lithium ion battery by the existing method. The method of the invention is as follows: 1. pretreatment of raw materials; 2. preparation of raw material slurry; 3. removal of bubbles by mixing slurry; 4. preparation of solid electrolyte membrane. The lithium ion migration number of the solid electrolyte membrane prepared by the invention reaches 0.77, the electrochemical stability window reaches 4.04V, the cyclic voltammetry test shows good reversibility and good compatibility with electrodes, and has good safety and lithium ion migration performance, and also has the characteristics of simple preparation and low cost. The invention is applied to the field of lithium ion batteries.

Description

technical field [0001] The invention relates to a method for preparing a solid electrolyte membrane with a high lithium ion migration number. Background technique [0002] At present, most of the lithium batteries used in the market are liquid electrolytes, which have high electrical conductivity, low internal resistance of the assembled batteries, and low lithium ion transmission resistance, which is conducive to the shuttle of lithium ions between the positive and negative electrodes. However, the safety problems of liquid electrolytes also occur frequently, and the use of liquid electrolytes is limited by explosion and leakage. The solid electrolyte is composed of a matrix, additives and conductive salts. The solvent is all removed during the preparation process. There is no liquid substance in the formed solid electrolyte membrane, which fundamentally solves the problem of liquid electrolyte leakage. The stability window is much higher than the electrochemical stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082Y02P70/50
Inventor 李丽波杜金田翟墨单宇航周达
Owner HARBIN UNIV OF SCI & TECH
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