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Method for reducing grain boundary impedance and interface impedance of oxide electrolyte

An interface impedance and electrolyte technology, applied in electrolytes, circuits, electrical components, etc., can solve the problems of high electrode/electrolyte interface impedance, poor contact of oxide solid electrolyte high temperature sintered electrodes, etc. simple effect

Active Publication Date: 2020-08-07
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of high temperature sintering of the oxide solid electrolyte and the poor contact with the electrode, resulting in extremely high electrode / electrolyte interface impedance, the present invention provides a method that uses a halide solid electrolyte to reduce the oxide electrolyte grain boundary impedance and interface. Impedance method

Method used

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  • Method for reducing grain boundary impedance and interface impedance of oxide electrolyte
  • Method for reducing grain boundary impedance and interface impedance of oxide electrolyte
  • Method for reducing grain boundary impedance and interface impedance of oxide electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Example 1 Composite 5% Li 3 InCl 6 -LLZO solid electrolyte powder / sheet

[0052] This embodiment provides a composite 5% Li 3 InCl 6 -Preparation of LLZO solid electrolyte powder / sheet, the steps are as follows:

[0053] (1) 52.6mg of Li 3 InCl 6 Dissolve in 5mL of ethanol:water mixed solution with a volume ratio of 1:3; take 1000mg of garnet-type solid electrolyte LLZO particles and mix in the solution;

[0054] (2) Place the mixed solution in a vacuum oven, and remove the solvent by vacuuming at room temperature; set the oven to 80°C for 12h; then set the temperature to 200°C for 5h to obtain a composite 5% Li 3 InCl 6 -LLZO solid electrolyte powder.

[0055] (3) the composite Li obtained above 3 InCl 6 -The LLZO solid electrolyte powder is transferred to an argon-protected glove box, and pressed into a battery mold with a pressure of 370MPa to obtain the composite 5% Li obtained above. 3 InCl 6 - LLZO solid electrolyte sheet.

Embodiment 2

[0056] Example 2 Composite 10% Li 3 InCl 6 -LLZO solid electrolyte powder / sheet

[0057] This embodiment provides a composite 5% Li 3 InCl 6 -Preparation of LLZO solid electrolyte powder / sheet, the steps are as follows:

[0058] (1) 111.1 mg of Li 3 InCl 6 Dissolve in 5mL of ethanol with a volume ratio of 1:3: water mixed solution; take commercially available garnet-type solid electrolyte LLZO particles 1000mg and mix with the solution;

[0059] (2) Place the mixed solution in a vacuum oven, and remove the solvent by vacuuming at room temperature; then set the oven to 80°C for 12h, and then set the temperature to 200°C for 5h to obtain a composite 10% Li 3 InCl 6 - LLZO solid electrolyte powder;

[0060] (3) adopt the compression molding method of embodiment 1, obtain composite 10% Li 3 InCl 6 - LLZO solid electrolyte sheet.

Embodiment 3

[0061] Example 3 Composite 15% Li 3 InCl 6 -LLZO solid electrolyte powder / sheet

[0062] This embodiment provides a composite 5% Li 3 InCl 6 -Preparation of LLZO solid electrolyte powder / sheet, the steps are as follows:

[0063] (1) 176.5mg of Li 3 InCl 6 Dissolve in 5mL of ethanol with a volume ratio of 1:3: water mixed solution; take commercially available garnet-type solid electrolyte LLZO particles 1000mg and mix with the solution;

[0064] (2) Place the mixed solution in a vacuum oven, and remove the solvent by vacuuming at room temperature; then set the oven to 80°C for 12h; then set the temperature to 200°C for 5h to obtain a composite 15% Li 3 InCl 6 -LLZO solid electrolyte powder.

[0065] (3) adopt the compression molding method of embodiment 1, obtain composite 15% Li 3 InCl 6 - LLZO solid electrolyte sheet.

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Abstract

The invention belongs to the technical field of solid-state battery materials, and particularly relates to a method for reducing grain boundary impedance and interface impedance of an oxide electrolyte. The method is characterized in that a halide electrolyte membrane is formed on the surfaces of oxide electrolyte particles or the surfaces of electrode particles. The crystal grain interface of theoxide electrolyte particles is modified by the halide electrolyte, so that the grain boundary impedance can be effectively reduced, and the aim of preparing the oxide solid electrolyte sheet by adopting a room-temperature cold pressing technology is fulfilled; the halide electrolyte membrane plays a role in bonding grain boundaries of particles and providing ionic conductance, so that the oxide solid electrolyte sheet can be prevented from being prepared by high-temperature sintering, and the obtained oxide-halide composite electrolyte sheet has very high ionic conductance. Similarly, the halide electrolyte is used for modifying the electrode particles so as to modify the interface of the active electrode material and the oxide solid electrolyte sheet, so that the active electrode material and the oxide solid electrolyte sheet are in close contact, the interface impedance is effectively reduced, and the obtained solid-state battery can normally work at room temperature and release good electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of solid-state battery materials, and in particular relates to a method for reducing the grain boundary impedance and interface impedance of an oxide electrolyte. Background technique [0002] As the energy crisis and environmental pollution problems become more and more serious, lithium-ion batteries have received more and more attention as green energy to replace fossil fuels. At present, lithium-ion batteries are mainly used in small devices such as Bluetooth headsets, mobile phones, cameras, and laptop computers. In order to further increase the energy density of lithium-ion batteries and apply them to the field of electric vehicles for long-distance driving, the safety issues and energy density issues of batteries need to be addressed. [0003] Based on this purpose, the development of solid-state lithium batteries is a good choice. Solid-state lithium batteries have higher energy density than traditi...

Claims

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Application Information

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IPC IPC(8): H01M10/0562H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M10/0525H01M10/0562H01M2300/0071Y02E60/10
Inventor 孙学良梁健能梁剑文孙乾王建涛赵尚骞张立黄欢卢世刚黄倬
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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