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High-ionic-conductivity composite solid electrolyte and preparation method thereof

A solid electrolyte and ionic conductivity technology, which is applied in the manufacture of solid electrolytes, composite electrolytes, electrolyte batteries, etc., can solve the problem of work efficiency and cost that cannot meet the needs of large-scale production, poor crystallinity of LLZO ceramic phase, and low conductivity of the composite system and other problems, to achieve the effects of large-scale promotion and application, improvement of ionic conductivity, and good crystallinity

Pending Publication Date: 2019-11-22
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The LLZO ceramic phase prepared by impregnating the precursor solution has poor crystallinity, and the content of the ceramic bulk phase is low, and the electrical conductivity of the composite system is relatively low; at the same time, the work efficiency and cost obviously cannot meet the needs of large-scale production

Method used

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  • High-ionic-conductivity composite solid electrolyte and preparation method thereof
  • High-ionic-conductivity composite solid electrolyte and preparation method thereof

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Embodiment 1

[0029] A method for preparing a composite solid electrolyte with high ionic conductivity, specifically comprising the following steps:

[0030] Step 1. Preparation of LLZO ceramic powder by solid phase sintering method: after mixing lithium hydroxide, lanthanum oxide and zirconia by ball milling, calcining at 900°C for 12 hours; then wet ball milling the calcined powder for 12 hours, the ball milling medium is ethanol, Drying to obtain LLZO ceramic powder with uniform particle size, the average particle size of the obtained powder is about 0.5 μm;

[0031] Step 2. Add 0.1 g of water-soluble isobutylene polymer with a short molecular chain of 5000 to 6000 in 10 g of deionized water as a dispersant, and stir for 10 minutes to mix evenly; Mix ball milling in a type ball mill for 60 minutes; then add 0.3 g of water-soluble isobutylene polymers with molecular chains of 45,000 to 65,000 and 0.3 g of molecular chains of 85,000 to 100,000 respectively, and obtain uniform water-based c...

Embodiment 2

[0039] A method for preparing a composite solid electrolyte with high ionic conductivity, specifically comprising the following steps:

[0040] Step 1. Add 0.4g ammonium polyacrylate in 10g deionized water as a dispersant, stir for 10min to mix evenly; then add 15g LAGP ceramic powder to it, mix and ball mill in a planetary ball mill for 60min; then add 0.8g epoxy Resin and 0.2g tetraethylenepentamine are mixed by ball milling to obtain a uniform water-based ceramic slurry;

[0041] Step 2, immerse the cellulose and polyester template into the water-based ceramic slurry obtained in step 1 to fully infiltrate, then take out the template, solidify and dry at room temperature (25°C);

[0042] Step 3. Calcining the sample obtained in step 2 to discharge the cellulose template. The calcination temperature is 550°C for 6 hours to obtain the calcined green body; then continue to heat up to 850°C and sinter for 8 hours to obtain a three-dimensional porous ceramic with a dense skeleton...

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Abstract

The invention discloses a preparation method of a high-ionic-conductivity composite solid electrolyte, and belongs to the field of ionic conductor electrolytes. The preparation method comprises the following steps: firstly, adding ceramic powder and a dispersing agent into deionized water to obtain slurry through ball-milling and mixing, dispersing the ceramic powder under the steric hindrance action of an organic chain of the dispersing agent adsorbed on the surfaces of ceramic particles, then adding a binder and a cross-linking agent, and continuously ball-milling to prepare water-based ceramic slurry; and before in-situ curing of the slurry, putting the template into the slurry, fully infiltrating, taking out, curing, drying, calcining to remove the template, carrying out high-temperature sintering to obtain a porous ceramic structure, and finally compounding with a polymer to obtain the solid electrolyte. Compared with other technologies, the method has the advantages that the structure of the porous ceramic electrolyte can be flexibly designed according to the selection of the template; meanwhile, the porous ceramic skeleton is compact, the crystallinity is good, the volume ratio is high, and the ionic conductivity of the composite electrolyte is greatly improved; the porous ceramic skeleton is environment-friendly, low in cost and beneficial to large-scale popularizationand application.

Description

technical field [0001] The invention belongs to the field of ion conductor electrolytes, in particular to a composite solid electrolyte with high ion conductivity and a preparation method thereof. Background technique [0002] Inorganic ceramic solid electrolytes have the advantages of good electrochemical performance, high ionic conductivity, and stable contact with lithium anodes, and are expected to be used to prepare solid-state lithium batteries with high safety and high energy density. However, the hard and brittle nature of the ceramic solid electrolyte limits the contact with the electrodes, resulting in excessive internal resistance at the battery interface. Therefore, the preparation of composite solid electrolytes from lightweight and flexible polymer electrolytes and inorganic ceramic electrolytes has become one of the hotspots in the research of solid-state lithium batteries. [0003] At present, the main work of composite solid electrolytes focuses on improvin...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058C04B38/06C04B35/447C04B35/462C04B35/48C04B35/622C04B35/634H01M10/052
CPCH01M10/056H01M10/058C04B38/0615C04B35/48C04B35/462C04B35/447C04B35/622C04B35/63408C04B2235/3203C04B2235/3227C04B2235/3232C04B2235/3217C04B2235/3287H01M10/052H01M2300/0065H01M2300/0088Y02E60/10Y02P70/50
Inventor 向勇彭翔张晓琨黄楷
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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