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Garnet-structured ceramic electrolyte material, preparation method and application therefor

A ceramic electrolyte and garnet technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of difficult accurate control of lithium content, complex synthesis process, and reduction of ceramic density and ion conductivity

Inactive Publication Date: 2015-12-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process equipment required by this method is relatively simple, the preparation conditions are easy to control, and it is beneficial to industrial production, but the disadvantage is that Li 2 The O component volatilizes in large quantities, making the Li 7 La 3 Zr 2 o 12 Lithium deficiency in ceramics generates pyrochlore heterophase, which reduces the density and ionic conductivity of ceramics, so it has not been widely used in the field of lithium-ion batteries
Patent CN201210067219.4 discloses Sb-doped Li 7-x La 3 Zr 2-x Sb x o 12 (0<x≤0.5) crystalline ceramic solid electrolyte material and its solid-phase synthesis, although Sb doping can provide ionic conductivity, but the synthesis process is relatively complicated, and the lithium content is difficult to achieve accurate control after repeated high-temperature sintering

Method used

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  • Garnet-structured ceramic electrolyte material, preparation method and application therefor
  • Garnet-structured ceramic electrolyte material, preparation method and application therefor
  • Garnet-structured ceramic electrolyte material, preparation method and application therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The chemical composition is 94wt% Li prepared by high-temperature solid-phase method 7.50 La 3.00 Zr 1.75 W 0.25 o 12.50 +6wt%Al 2 o 3 The ceramic electrolyte: LiOH·H 2 O powder, La(OH) 3 Powder, ZrO 2 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, dried in an alcoholic medium for 12 hours, then calcined at 900°C for 12 hours and cooled to room temperature at a heating rate of 3°C / min and a cooling rate of 2°C / min to obtain Li 7.50 La 3 Zr 1.75 W 0.25 o 12.50 Ceramic powder. Then with 94wt% Li 7.50 La 3 Zr 1.75 W 0.25 o 12.50 +6wt%Al 2 o 3 As a ceramic component, add 6wt.% Al to the ceramic powder 2 o 3 The powder is ball milled in an alcohol medium for 24 hours and then dried to obtain the mother powder. Weigh a certain amount of mother powder and dry press it under a pressure of 200Mpa, then put the molded body into an alumina crucible with a lid, surround the molded body with mother powder, raise the temperature t...

Embodiment 2

[0041] The chemical composition is 96wt% Li prepared by high-temperature solid-state method 7.30 La 3.00 Zr 1.65 W 0.35 o 12.50 +4wt%Y 2 o 3 The ceramic electrolyte: LiOH·H 2 O powder, La(OH) 3 Powder, ZrO 2 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, dried in an alcoholic medium for 12 hours, then calcined at 900°C for 12 hours and cooled to room temperature at a heating rate of 3°C / min and a cooling rate of 2°C / min to obtain Li 7.30 La 3.00 Zr 1.65 W 0.35 o 12.50 Ceramic powder. Then with 96wt% Li 7.30 La 3.00 Zr 1.65 W 0.35 o 12.50 +4wt%Y 2 o 3 As a ceramic component, add 4wt.% of Y to the ceramic powder 2 o 3 The powder is ball milled in an alcohol medium for 24 hours and then dried to obtain the mother powder. Weigh a certain amount of mother powder and dry press it under a pressure of 200Mpa, then put the molded body into an alumina crucible with a lid, surround the molded body with mother powder, raise the tempera...

Embodiment 3

[0043] The chemical composition is 97wt% Li prepared by high-temperature solid-phase method 7.10 La 3.00 Zr 1.65 W 0.45 o 12.50 +3wt%B 2 o 3 The ceramic electrolyte: LiOH·H 2 O powder, La(OH) 3 Powder, ZrO 2 Powder and WO 3 The powder was weighed according to the stoichiometric ratio, dried in an alcoholic medium for 12 hours, then calcined at 900°C for 12 hours and cooled to room temperature at a heating rate of 3°C / min and a cooling rate of 2°C / min to obtain Li 7.10 La 3.00 Zr 1.65 W 0.45 o 12.50 Ceramic powder. Then with 97wt% Li 7.10 La 3.00 Zr 1.65 W 0.45 o 12.50 +3wt%B 2 o 3 As a ceramic component, add 3wt.% B in the ceramic powder 2 o 3 The powder is ball milled in an alcohol medium for 24 hours and then dried to obtain the mother powder. Weigh a certain amount of mother powder and dry press it under a pressure of 200Mpa, then put the molded body into an alumina crucible with a lid, surround the molded body with mother powder, raise the temperatur...

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Abstract

The invention relates to a garnet-structured ceramic electrolyte material, a preparation method and an application therefor. The chemical composition of the garnet-structured ceramic electrolyte material is (1-z) Li (7-2x+2y) La3Zr (2-x) WxO (12+y)+ zA, wherein x is more than 0 and less than or equal to 1.00; y is more than 0 and less than or equal to 2.00; z is more than or equal to 0 and less than or equal to 10 wt.%; and A is any one of Li2O, MgO, CaO, SrO, BaO, Y2O3, B2O3, SiO2, WO3, CuO or Al2O3. According to the cubic garnet-structured lanthanum zirconate lithium crystal doped with W element provided by the invention, by doping W ion (+6 valence), which is higher than zirconium ions Zr4+ in valence, in the lanthanum zirconate lithium crystal to replace part of zirconium ions Zr4+ in crystal lattices, the number of lithium ions Li+ in the crystal is reduced, the vacancy of the lithium ions Li+ is increased, and the formation of an migration channel for the lithium ions Li+ is facilitated, so that the garnet-structured ceramic electrolyte material is higher in volume phase ionic conductivity.

Description

technical field [0001] The invention relates to a garnet structure ceramic electrolyte material and a preparation method thereof, belonging to the field of lithium ion batteries. Background technique [0002] With the development of the automobile industry, the increasing depletion of non-renewable fossil fuels such as oil and natural gas, as well as the air pollution and room temperature effects caused by the use of these fuels have gradually become global problems. In order to solve these energy and environmental problems, electric vehicles have gradually become the key direction of global economic development. The United States, Japan, Germany, China and other countries have vigorously developed electric vehicles one after another. As the core component of electric vehicles, power batteries require the following performances: high specific energy and energy density; high specific power and power density; fast charging and deep discharging capabilities; long service life; ...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0525H01M10/0562Y02E60/10
Inventor 郭向欣陈骋李忆秋曹阳
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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