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Water-based solid electrolyte membrane, preparation method thereof, and secondary battery

A technology of solid electrolyte membrane and solid electrolyte, applied in secondary batteries, electrolyte immobilization/gelation, circuits, etc., can solve the problems of high cost and poor safety, achieve uniform thickness, good high temperature resistance, liquid absorption good sex effect

Active Publication Date: 2018-09-28
LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the slurry of solid electrolyte material coating film mainly uses oil-based slurry, which has hidden dangers such as high cost and poor safety. Therefore, it is urgent to propose a solid electrolyte membrane and a preparation method to make up for the current technical defects.

Method used

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  • Water-based solid electrolyte membrane, preparation method thereof, and secondary battery
  • Water-based solid electrolyte membrane, preparation method thereof, and secondary battery
  • Water-based solid electrolyte membrane, preparation method thereof, and secondary battery

Examples

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Embodiment 1

[0055] This embodiment provides a water-based solid electrolyte membrane, comprising a base film and a water-based solid electrolyte layer composed of a coating slurry coated on one side of the base film, wherein the base film is a polypropylene porous film with a thickness of 10um, and a single The surface coating method, the coating thickness is 2um, and the coating slurry used to form the water-based solid electrolyte layer is according to the mass ratio: 20% of the composition, 80% of deionized water; wherein, the preparation of the composition is according to the mass ratio: nano Lithium Titanium Aluminum Phosphate Lithium Solid Electrolyte 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 Powder 97%, particle size D50 is 200nm, binder sodium carboxymethyl cellulose 1%, binder styrene-butadiene latex 1%, dispersant sodium polyacrylate 1%, additive octylphenol polyoxyethylene 1% .

[0056] The aqueous solid electrolyte membrane in this example is prepared by the following method, which spe...

Embodiment 2

[0064] This embodiment provides a water-based solid electrolyte ceramic membrane, which includes a base membrane and a water-based solid electrolyte layer composed of a coating slurry coated on one side of the base membrane. The base film is a polypropylene porous film with a thickness of 7um. It is coated on one side with a thickness of 2um. The coating slurry used to form the water-based solid electrolyte layer is: 20% composition, 80% deionized water %; wherein, the preparation of the composition is according to the mass ratio: nanometer solid electrolyte lithium titanium aluminum phosphate Li 1.5 al 0.5 Ti 1.5 (PO 4 ) 3 Powder 96%, particle size D50 is 200nm, binder sodium carboxymethyl cellulose 1%, binder styrene-butadiene latex 1%, dispersant 1% sodium dodecyl sulfate, additive octylphenol polyoxygen Ethylene 0.5%, polyvinyl alcohol 0.5%.

[0065] The method for preparing the water-based solid electrolyte membrane is the same as in Example 1, except that the coatin...

Embodiment 3

[0067] This embodiment provides a water-based solid electrolyte membrane, comprising a base membrane and a water-based solid electrolyte coating composed of a coating slurry coated on one side of the base membrane, wherein the base membrane is a polypropylene porous membrane with a thickness of 7um. Single-sided coating method, the coating thickness is 2um, and the coating slurry used to form the water-based solid electrolyte layer is according to the mass ratio: 20% of the composition, 80% of deionized water; wherein, the preparation of the composition is according to the mass ratio: Nano-solid electrolyte lithium titanium aluminum phosphate Li 1.2 al 0.2 Ti 1.8 (PO 4 ) 3Powder 97%, particle size D50 is 200nm, binder sodium carboxymethyl cellulose 1%, binder styrene-butadiene latex 1%, dispersant polyethylene glycol 0.2%, dispersant sodium lignosulfonate 0.6%, Auxiliary fluorocarbon surfactant 0.2%.

[0068] The method for preparing the water-based solid electrolyte memb...

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Abstract

The invention discloses a water-based solid electrolyte membrane, a preparation method thereof, and a secondary battery. The water-based solid electrolyte membrane comprises: a base film of 1 um-50 um, and a water-based solid electrolyte layer of 0.5 um-10um composed of a coating slurry coated on the base film or a coating slurry coated on the base film and permeating into the base film, wherein the coating slurry comprises: 1-40 parts of composition and 60-99 parts of deionized water in parts by mass; the composition comprises: 94 wt%-99.97 wt% of solid electrolyte powder, 0.01 wt%-2 wt% of water soluble binder, 0.01 wt%-2 wt% of water soluble dispersant, and 0.01 wt%-2 wt% of water soluble adjuvant. The water-based solid electrolyte membrane has good liquid absorption, uniform thickness,high temperature resistance and high ion conductivity, and may be used in liquid, semi-solid, quasi-solid, all-solid lithium batteries and metal lithium batteries.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to an aqueous solid electrolyte membrane, a preparation method thereof and a secondary battery. Background technique [0002] The main components of a traditional liquid lithium-ion battery are positive electrode, negative electrode, electrolyte and membrane. The membrane plays the role of insulating electrons and transferring them to ions. Most commercialized membranes are mainly coated with nano-alumina, and the surface of the base membrane is coated with a layer of alumina ceramics, which can effectively improve the heat resistance, safety, thermal stability and mechanical strength of the membrane, thereby Extend the life of the membrane. [0003] However, oxide, as an inactive material, reduces the energy density of the battery. At the same time, aluminum oxide does not have the ability to conduct lithium. It is coated on the surface of the film, which increases the ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562H01M2300/0085Y02E60/10
Inventor 闫昭罗飞郑峰李泓
Owner LIYANG TIANMU PILOT BATTERY MATERIAL TECH CO LTD
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