Garnet-structure lithium lanthanum tantalate-based solid electrolyte material and preparation method thereof

A technology based on lanthanum lithium tantalate and solid electrolyte, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc. It can solve the problems of harsh preparation conditions, poor electrochemical stability, and low conductivity, and achieve mild calcination conditions , stable lithium ion content and short calcination time

Inactive Publication Date: 2014-02-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to provide a garnet structure with good electrochemical stability and high electrical conductivity in view of the defects of low electrical conductivity, poor electrochemical stability and relatively harsh preparation conditions in the lithium inorganic solid electrolyte material in the prior art. Lanthanum Lithium Tantalate Based Solid Electrolyte Material

Method used

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  • Garnet-structure lithium lanthanum tantalate-based solid electrolyte material and preparation method thereof
  • Garnet-structure lithium lanthanum tantalate-based solid electrolyte material and preparation method thereof
  • Garnet-structure lithium lanthanum tantalate-based solid electrolyte material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] The concrete steps of preparation are:

[0037] Step 1, follow Li 5+δ La 3-x A x Ta 2-y B y o 12 The composition ratio, where x=0, y=1.0, first weigh the corresponding amount of tantalum pentoxide, add to the 2 C 2 o 4 If it is insoluble, it can be heated to make it clear, and then add nitrate or acetate of lithium, lanthanum, and tantalum doping compound (B=Nb) to the solution to prepare a solution, and finally add it to the mixed solution Add EDTA, wherein the molar ratio of EDTA to metal ions in the mixed solution is 0.08, place it at 80° C. and stir for 1 h to obtain a transparent and clear sol.

[0038] Step 2, after adding a water-soluble polymer to the sol, place it under stirring at 50°C to form a gel, wherein the mass ratio of the water-soluble polymer to EDTA is 2:30, and the water-soluble polymer The polymer is polyethylene glycol.

[0039]Step 3, firstly dry the gel at 80°C for 24 hours to obtain a fluffy xerogel, then calcinate the xerogel at 700°...

Embodiment 2

[0041] The concrete steps of preparation are:

[0042] Step 1, follow Li 5+δ La 3-x A x Ta 2-y B y o 12 The composition ratio, where x=0.25, y=0.75, first weigh the corresponding amount of tantalum pentoxide, add to the 2 C 2 o 4 If it is insoluble, it can be heated to make it clear, and then add nitrate or acetic acid of lithium, lanthanum, lanthanum doping compound (A=K) ​​and tantalum doping compound (B=Nb) to the solution After the salt was formulated into a solution, EDTA was finally added to the mixed solution, wherein the molar ratio of the added EDTA to the metal ion in the mixed solution was 0.08, and it was placed at 50° C. and stirred for 1.5 h to obtain a transparent and clear sol.

[0043] Step 2, after adding a water-soluble polymer to the sol, place it under stirring at 60°C to form a gel, wherein the mass ratio of the water-soluble polymer to EDTA is 1.5:20, and the water-soluble polymer The polymer is polyethylene glycol.

[0044] Step 3, firstly dry...

Embodiment 3

[0046] The concrete steps of preparation are:

[0047] Step 1, follow Li 5+δ La 3-x A x Ta 2-y B y o 12 The composition ratio, where x=0.25, y=0.25, first weigh the corresponding amount of tantalum pentoxide, add to the 2 C 2 o 4 If it is insoluble, it can be heated to make it clear, and then add the nitrate or acetic acid of lithium, lanthanum, lanthanum doping compound (A=K) ​​and tantalum doping compound (B=In) to the solution After the salt was formulated into a solution, EDTA was finally added to the mixed solution, wherein the molar ratio of the added EDTA to the metal ion in the mixed solution was 0.06, and it was placed at 50° C. and stirred for 1.2 h to obtain a transparent and clear sol.

[0048] Step 2, after adding a water-soluble polymer to the sol, place it under stirring at 70°C to form a gel, wherein the mass ratio of the water-soluble polymer to EDTA is 1.5:15, and the water-soluble polymer The polymer is polyethylene glycol.

[0049] Step 3, firstly...

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Abstract

The invention discloses a garnet-structure lithium lanthanum tantalate-based solid electrolyte material and a preparation method thereof. The lithium lanthanum tantalate-based solid electrolyte material is a compound of Li5La3Ta2O12 doped at the lanthanum site and/or tantalum site; and the preparation method comprises the following steps: dissolving tantalum pentoxide in a H2C2O4 solution; adding lithium salt and lanthanum slat and the salt of a lanthanum site-doped compound and/or the salt of a tantalum site-doped compound, and mixing to obtain a solution; adding EDTA into the obtained mixed solution for reaction until transparent and clear sol appears; adding a water-soluble high-molecular polymer and continuously reacting until gel appears; drying the obtained gel and calcining; performing mould pressing of the calcined particles to obtain a blank; and further calcining the blank to obtain the solid electrolyte material. The preparation method is mild in conditions, simple in process and simple to operate, and can realize industrial production; the prepared solid electrolyte material has good electrochemical stability and relatively high electrical conductivity, and can be used for preparing an all-solid-state lithium ion battery.

Description

technical field [0001] The invention relates to a garnet-structured lanthanum lithium tantalate-based solid electrolyte material and a preparation method thereof, belonging to the field of electrolyte materials. Background technique [0002] Due to the shortage of resources caused by the huge consumption of traditional petrochemical resources, urban air pollution and global greenhouse effect, the development of green and pollution-free renewable energy (such as wind energy, solar energy, tidal energy, geothermal energy) has become a matter of sustainable survival and development of human society. development problems to be solved. How to achieve safe and effective storage and conversion of various energy sources has become a research hotspot at home and abroad. Lithium-ion batteries have the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, and are regarded as the most effective energy storage and conversion system at ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/058
CPCH01M10/0562H01M10/058Y02E60/10Y02P70/50
Inventor 彭红建胡薏冰曹远尼刘素琴
Owner CENT SOUTH UNIV
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