Preparation method of low-temperature flexible polymer solid electrolyte membrane and application of electrolyte membrane to low-temperature solid lithium ion battery

A technology of solid electrolyte membrane and lithium ion battery, applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, solid electrolyte, etc., can solve the problems of low low temperature conductivity and poor flexibility, and achieve good conductivity and flexibility, excellent low temperature Effects of Toughness and Conductivity

Inactive Publication Date: 2019-03-01
河南电池研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to solve the problems of low-temperature low-temperature conductivity and poor flexibility of the current solid-state electrolyte membrane, and provide a method for preparing a low-temperature flexible polymer solid-state electrolyte membrane and its application in low-temperature solid-state lithium-ion batteries

Method used

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  • Preparation method of low-temperature flexible polymer solid electrolyte membrane and application of electrolyte membrane to low-temperature solid lithium ion battery
  • Preparation method of low-temperature flexible polymer solid electrolyte membrane and application of electrolyte membrane to low-temperature solid lithium ion battery

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Embodiment 1

[0028] Preparation of positive electrode sheet:

[0029] According to the mass percentage of 80:3:7:10, add the positive electrode active material lithium iron phosphate, conductive agent acetylene black, lithium salt lithium perchlorate and binder modified polyvinyl chloride TPE into an appropriate amount of solvent NMP to make a slurry The material was uniformly ball-milled and coated on an aluminum foil, then dried in an oven at 80°C for 30 minutes, and then dried in a vacuum oven at 110°C for 24 hours to obtain a positive electrode sheet.

[0030] The preparation method of the low-temperature flexible polymer solid-state electrolyte membrane comprises the following steps:

[0031] Step S1: Dissolve 2 g of modified polyvinyl chloride TPE and 1 g of lithium salt LiTFSI in an appropriate amount of solvent tetrahydrofuran and stir evenly to obtain a clear viscous solution;

[0032] Step S2: Add 1 g of plasticizer diethyl phthalate DEP to the viscous solution obtained in Step ...

Embodiment 2

[0039] Preparation of positive electrode sheet:

[0040] According to the mass percentage of 80:3:7:10, the positive electrode active material lithium cobaltate, conductive agent acetylene black, lithium salt lithium perchlorate and binder modified polyvinyl chloride TPE are added to an appropriate amount of solvent NMP, and adjusted to The slurry was uniformly ball-milled and coated on an aluminum foil, then dried in an oven at 80°C for 30 minutes, and then dried in a vacuum oven at 110°C for 24 hours to obtain a positive electrode sheet.

[0041] The preparation method of the low-temperature flexible polymer solid-state electrolyte membrane comprises the following steps:

[0042] Step S1: Dissolve 2 g of modified polyvinyl chloride TPE / polyvinyl fluoride PVF mixture and 0.2 g of lithium salt LiTFSI in an appropriate amount of solvent acetonitrile and stir evenly to obtain a clear viscous solution;

[0043] Step S2: Add 0.6 g of plasticizer ethylene carbonate EC to the viscous...

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Abstract

The invention discloses a preparation method of a low-temperature flexible polymer solid electrolyte membrane and application of the electrolyte membrane to a low-temperature solid lithium ion battery, and belongs to the technical field of solid lithium ion batteries. The preparation method is characterized by comprising the following steps: mixing lithium salt with 5 to 20 percent by mass of polymer and a plasticizer with 10 to 50 percent by mass of polymer, and adding the mixture into a solvent for fully dissolving; mixing inorganic particles with 10 to 90 percent by mass of polymer and thesolvent, performing ball milling, and adding the mixture into the solution; coating a carrier with the prepared solution in a scraping or curtain coating manner; drying at a temperature of 60 to 120 DEGC to obtain the low-temperature flexible polymer solid electrolyte membrane with the thickness of 20 to 100 mu m. The invention further discloses the application of the low-temperature flexible polymer solid electrolyte membrane to the low-temperature solid lithium ion battery. The prepared polymer solid electrolyte membrane used in the low-temperature solid liquid ion battery has high conductivity and flexibility at a low temperature, so that the preparation of the solid lithium ion battery which can cycle in an efficient, stable and safe manner becomes possible.

Description

technical field [0001] The invention belongs to the technical field of solid lithium-ion batteries, and in particular relates to a preparation method of a low-temperature flexible polymer solid-state electrolyte membrane and its application in low-temperature solid lithium-ion batteries. Background technique [0002] With the development and progress of society, the demand for electric vehicles and grid energy storage is becoming more and more urgent. It is an inevitable trend to develop batteries with wide operating temperature, good safety, high energy density and high power. Among various commercialized secondary charging and discharging devices, lithium-ion batteries have the greatest potential. At present, commercial lithium-ion batteries are mainly based on liquid electrolytes, and their main components include LiPF 6 , LiFSI and other lithium salts and organic solvents mainly composed of cyclic carbonates (EC, PC), chain carbonates (DEC, DMC, EDC), carboxylates (MF, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 杨书廷王秋娴李凯岳红云
Owner 河南电池研究院有限公司
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