A simple method for preparing polymer electrolyte thin films for lithium-ion batteries

A technology of electrolyte film and solid polymer, applied in the direction of non-aqueous electrolyte storage battery, electrolyte storage battery manufacturing, final product manufacturing, etc. Ideal chemical properties, simple and convenient preparation method, and good physical appearance

Inactive Publication Date: 2018-05-15
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of lithium-ion battery electrolyte leakage and the unsatisfactory conductivity of the solid electrolyte film. The present invention provides a method for preparing PVdF / PVA / MMT solid polymer electrolyte film

Method used

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  • A simple method for preparing polymer electrolyte thin films for lithium-ion batteries
  • A simple method for preparing polymer electrolyte thin films for lithium-ion batteries
  • A simple method for preparing polymer electrolyte thin films for lithium-ion batteries

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specific Embodiment approach 1

[0025] Specific embodiment one: the method for preparing PVdF / PVA / MMT solid polymer electrolyte film described in this embodiment, the method for preparing PVdF / PVA / MMT solid polymer electrolyte film,

[0026] It includes the following steps.

[0027] Step 1: Place the PVdF and PVA to be used in a drying oven for drying.

[0028] Step 2: Dissolve 0.5g PVdF in 2-3ml DMF solvent for 15 hours, dissolve 2wt%-6wt% MMT in 1-2ml THF solvent for 15 hours, mix the two and continue stirring for 15 hours to ensure that the polymer solution is uniform and stable.

[0029] Step 3: Sonicate the stirred solution for 5-10 minutes.

[0030] Step 4: Dissolve 0.1g PVA in 1-2ml DMF solvent for 2 hours in advance, continue mixing with the solution mixed with PVdF and MMT, add appropriate amount of lithium salt and continue stirring for 6 hours until the solution is uniform and stable.

[0031] Step 5: Repeat step 3, then go to step 6.

[0032] Step 6: Pour the stirred polymer solution on a clea...

specific Embodiment approach 2

[0042] Embodiment 2: This embodiment is a further description of the method for preparing PVdF / PVA / MMT solid polymer electrolyte film described in Embodiment 1. The second step is: combine the dried PVdF and MMT in step 1 Dissolve in appropriate amount of DMF and THF solution respectively and stir for 15 hours, then mix and stir for 15 hours to ensure uniform and stable solution.

specific Embodiment approach 3

[0043] Specific embodiment three: this embodiment is a further description of the method for preparing PVdF / PVA / MMT solid polymer electrolyte film described in specific embodiment one,

[0044] The third step is: put the polymer solution stirred in the second step in an ultrasonic wave for 5-10 minutes to ensure the homogeneity of the solution.

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Abstract

A method for conveniently preparing polymer electrolyte thin films for large-scale lithium-ion batteries. It relates to a preparation method of a lithium ion battery polymer electrolyte film. The invention mainly solves the problem of electrolyte leakage and potential safety hazards in existing commercial batteries and the problem of low electrical conductivity of the all-solid electrolyte film. The preparation method of the present invention is as follows: dissolve 0.5g PVdF in 2-3ml DMF solvent for 15 hours, dissolve 2wt%-6wt%MMT in 1-2ml THF solvent for 15 hours, and continue stirring for 15 hours after the two are mixed; The good solution was sonicated for 5-10 minutes, then 0.1g PVA was dissolved in 1-2ml DMF solvent for 2 hours, and mixed with the solution mixed with PVdF and MMT, and an appropriate amount of lithium salt was added and stirred for 6 hours, and the stirred The polymer solution was poured on a clean glass plate, and the glass plate was put into a vacuum drying oven for drying treatment at a heating temperature of 120°C for 60 minutes and then taken out for use. The invention is applied to the field of lithium ion batteries.

Description

technical field [0001] The invention relates to a method for conveniently preparing a large-scale lithium ion battery polymer electrolyte film. Background technique [0002] With the development of the economy and the progress of civilization, human beings' dependence on energy is increasingly inclined to a sustainable and environmentally friendly new energy system. Lithium-ion battery was born at the end of the 20th century. It is a green, high-energy and environment-friendly battery. It stands out among many chemical power sources due to its high working voltage, high specific energy, long cycle life, and low pollution. Since its commercialization in the 1990s It has attracted much attention because of its superior performance, and has become one of the mainstream power sources for pure electric EVs and hybrid HEVs. However, the existence of organic electrolyte will cause many safety problems, and then restrict its development. Under the conditions of high temperature, sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058
CPCH01M10/058Y02E60/10Y02P70/50
Inventor 李丽波马月
Owner HARBIN UNIV OF SCI & TECH
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