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Production method of sandwich-like structure solid polymer electrolyte membrane, and application of sandwich-like structure solid polymer electrolyte membrane in solid-state lithium ion battery

A solid polymer and lithium-ion battery technology, applied in electrolytes, secondary batteries, structural parts, etc., can solve problems such as poor mechanical properties, low electrical conductivity, high interface impedance, etc., to increase mechanical properties and improve lithium ion conductivity The effect of reducing the contact internal resistance

Active Publication Date: 2018-02-23
HENAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problems of low conductivity, high interfacial impedance and poor mechanical properties faced by existing solid polymer electrolytes, and provide a method for preparing a sandwich-structured solid polymer electrolyte membrane and its application in solid lithium Applications in Ion Batteries

Method used

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  • Production method of sandwich-like structure solid polymer electrolyte membrane, and application of sandwich-like structure solid polymer electrolyte membrane in solid-state lithium ion battery
  • Production method of sandwich-like structure solid polymer electrolyte membrane, and application of sandwich-like structure solid polymer electrolyte membrane in solid-state lithium ion battery

Examples

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Embodiment 1

[0018] Preparation of positive electrode sheet:

[0019] According to the mass percentage of 80:10:10, the positive electrode active material lithium iron phosphate, the conductive agent acetylene black and the binder PPC are added to an appropriate amount of anhydrous acetonitrile, stirred and mixed evenly to prepare a slurry and coated on an aluminum foil, and then It was dried in an oven at 40° C. for 30 minutes, and then dried in a vacuum oven at 80° C. for 24 hours to obtain a lithium iron phosphate positive electrode sheet.

[0020] Preparation of sandwich-like solid polymer electrolyte membrane:

[0021] Dissolve 1g of PPC and 0.5g of alkali metal salt LiTFSI in an appropriate amount of acetonitrile, stir and mix uniformly to obtain solution A; take half of solution A and add 0.2g plasticizer SN to it, fully stir and mix uniformly to obtain solution B; The two sides were coated with solution A and solution B respectively, and dried in a vacuum oven for 12 hours to obta...

Embodiment 2

[0027] Preparation of positive electrode sheet:

[0028] According to the mass percentage of 70:10:20, the positive electrode active material nickel cobalt manganese, the conductive agent acetylene black and the binder PEO are added to an appropriate amount of anhydrous acetonitrile, stirred and mixed evenly to prepare a slurry and coated on an aluminum foil, and then It was dried in an oven at 40° C. for 30 minutes, and then dried in a vacuum oven at 80° C. for 24 hours to obtain a positive electrode sheet of nickel cobalt lithium manganese oxide.

[0029] Preparation of sandwich-like solid polymer electrolyte membrane:

[0030] Dissolve 1g of PEO and 0.17g of alkali metal salt LiTFSI in an appropriate amount of acetonitrile, stir and mix uniformly to obtain solution A; take half of solution A and add 0.6g plasticizer SN to it, fully stir and mix uniformly to obtain solution B; Both sides of the fiber membrane were coated with solution A and solution B, and dried in a vacuum...

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Abstract

The invention discloses a production method of a sandwich-like structure solid polymer electrolyte membrane, and an application of the sandwich-like structure solid polymer electrolyte membrane in a solid-state lithium ion battery, and belongs to the technical field of solid-state lithium ion batteries. The production method comprises the following steps: taking a polymer and an alkali metal saltaccording to a mass ratio of (2-6):1, dissolving the polymer and the alkali metal salt in acetonitrile, and performing stirring and uniform mixing to obtain a solution A; taking half of the solution A, adding a plasticizer, and performing full stirring and uniform mixing to obtain a solution B; and respectively coating two sides of a support membrane with the solution A and the solution B, and drying the coated support membrane in a vacuum drying box for 12-24 h to produce the sandwich-like structure solid polymer electrolyte membrane. The invention also discloses a production method of a solid-state lithium ion battery using the sandwich-like structure solid polymer electrolyte membrane. The produced sandwich-like structure solid polymer electrolyte membrane has the advantages of high ionconductivity, good mechanical strength, low interface impedance, good interfacial stability, and effective improvement of the cycling stability of the solid-state lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium-ion batteries, and in particular relates to a method for preparing a sandwich-like solid polymer electrolyte membrane and its application in solid-state lithium-ion batteries. Background technique [0002] In recent years, lithium-ion batteries have been widely used in many fields, especially in various portable electronic products, due to their many advantages such as high energy density, long cycle life, and low self-discharge rate. With the development and progress of society, lithium-ion batteries have also become one of the best candidates for the power source of pure electric vehicles and hybrid vehicles. However, most of the current commercial lithium-ion batteries use leaky, volatile, and explosive organic electrolytes, which greatly reduce the safety performance and energy density of lithium-ion batteries. Therefore, using solid electrolytes instead of traditional liquid elec...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0564H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/056H01M10/0564H01M10/0565H01M2300/0091H01M2300/0094Y02E60/10
Inventor 岳红云王秋娴李静娴董红玉尹艳红杨书廷
Owner HENAN NORMAL UNIV
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