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Method for preparing solid electrolyte membrane with high lithium-ion migration number

A technology of solid electrolyte membrane and ion migration number, applied in solid electrolyte, non-aqueous electrolyte, circuit, etc., can solve the problems of poor lithium ion migration number and poor battery performance in polyvinylidene fluoride-based electrolytes, and improve lithium ion migration Difficulty, fast film formation, and good mechanical properties

Active Publication Date: 2019-11-05
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing solid electrolyte membrane with high lithium-ion migration number
  • Method for preparing solid electrolyte membrane with high lithium-ion migration number
  • Method for preparing solid electrolyte membrane with high lithium-ion migration number

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specific Embodiment approach 1

[0028] Specific 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] Heat 0.25g of polyvinylidene fluoride, 0.0278g of hydroxypropyl methylcellulose, 0.0075g of stearic acid, and 0.20g of lithium bistrifluoromethanesulfonimide at a temperature of 80°C for 10h under vacuum, and wait use;

[0031] 2. Preparation of raw material slurry

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

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

[0034] 3. Mix slurry to remove air bubbles

[0035] Mix the two slurries in step ...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment differs from Embodiment 1 in that: the pretreatment method described in Step 1 is to heat at 80° C. for 10 h under vacuum conditions. Others are the same as in 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

The invention provides a method for preparing solid electrolyte membrane with a high lithium-ion migration number and relates to a method for preparing a solid electrolyte of a lithium-ion battery. The problems of low safety and low lithium-ion migration number of a lithium-ion battery prepared by an existing method are solved. The method comprises the steps of (1) the pretreatment of raw materials, (2) the preparation of raw material slurries, (3) the mixing of the slurries to remove bubbles, and (4) the preparation of the solid electrolyte membrane. The solid electrolyte membrane prepared bythe invention has a lithium-ion migration number of 0.77 and an electrochemical stability window of 4.04V, good reversibility and good compatibility with an electrode are exhibited in a cyclic voltammetry test, the safety performance and lithium-ion migration performance are good, the preparation is simple, the cost is low, and the method 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 high lithium ion transfer number. Background technique [0002] At present, most of the lithium batteries used in the market are liquid electrolytes. The liquid electrolyte has high conductivity, the assembled battery has low internal resistance, and the lithium ion transmission resistance is small, which is beneficial for lithium ions to shuttle between the positive and negative electrodes. However, safety issues with liquid electrolytes also frequently arise, such as explosions and liquid leakage, which limit the use of liquid electrolytes. The solid-state 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-state electrolyte membrane, which fundamentally solves the problem of liquid electrolyte leakage, and the electrochemistry of the solid-state ...

Claims

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Application Information

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Patent Type & Authority Applications(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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