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Solid electrolyte LLZO powder and preparation method thereof

A solid electrolyte, solid electrolyte technology, applied in electrolytes, circuits, electrical components and other directions, can solve the problems of easy generation of lithium carbonate layer, high cost, complex process, etc., and achieve simple and easy methods, reduced production costs, and stable surfaces. Effect

Pending Publication Date: 2021-08-31
王伟东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the defects in the prior art, the present invention provides a solid electrolyte LLZO powder and a preparation method thereof, aiming at solving the problem that lithium carbonate layer is easily produced on the surface of the material prepared by the existing LLZO preparation method, and the process is complicated and the cost is relatively high. high problem

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  • Solid electrolyte LLZO powder and preparation method thereof
  • Solid electrolyte LLZO powder and preparation method thereof
  • Solid electrolyte LLZO powder and preparation method thereof

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preparation example Construction

[0033] Another aspect of the present invention provides a method for preparing the above-mentioned solid electrolyte LLZO powder, comprising the following steps:

[0034] Step 1, preparing inner core powder; In some embodiments, the titanium source can be nano titanium dioxide; the aluminum source can be nano aluminum oxide; the phosphorus source can be ammonium dihydrogen phosphate, ammonium phosphate one or several;

[0035] Specifically, the method for preparing inner core powder comprises the following steps:

[0036] Step a, weigh the lithium source, lanthanum source, and zirconium source according to the stoichiometric ratio, and put them into a mixer to mix uniformly to obtain mixture 2; in some embodiments, the lithium source can be lithium hydroxide, and the lanthanum The source can be nano-lanthanum trioxide; the zirconium source can be nano-zirconium dioxide;

[0037] Step b, put the mixture 2 into a sagger, and place it in a sealed roller kiln at 900-1000°C for 1...

Embodiment 1

[0043] Weigh 175kg of lithium hydroxide, 291kg of nanometer lanthanum trioxide and 147kg of nanometer zirconium dioxide, put them into a high-speed mixer and mix them evenly to obtain a mixture. Put the mixture into a sagger, enter the sealed roller kiln for sintering, the sintering temperature is 1000℃, and the sintering time is 16h. During the sintering process, an appropriate amount of air to remove carbon dioxide is introduced to keep the kiln at a slightly positive pressure. The sintered material was crushed, crushed, classified and sieved to obtain 490 kg of uncoated LLZO powder. Detect the surface lithium carbonate content of the powder to be: 1000ppm. Put 490kg of the above-mentioned LLZO powder, 3.51kg of ammonium dihydrogen phosphate, 0.16kg of nano-aluminum oxide, and 1.38kg of nano-titanium dioxide into a high-speed mixer and mix evenly, then put it into a sagger, and enter a sealed roller kiln for sintering. The temperature is 900℃, and the sintering time is 6h....

Embodiment 2

[0045]Weigh 175kg of lithium hydroxide, 291kg of nanometer lanthanum trioxide and 147kg of nanometer zirconium dioxide, put them into a high-speed mixer and mix them evenly to obtain a mixture. Put the mixture into a sagger, enter the sealed roller kiln for sintering, the sintering temperature is 900°C, and the sintering time is 16h. During the sintering process, an appropriate amount of nitrogen gas is introduced to keep the kiln at a slightly positive pressure. The sintered material was crushed, crushed, classified and sieved to obtain 492 kg of uncoated LLZO powder. The surface lithium carbonate content of the powder detected is: 1300ppm. Put 490kg of the above-mentioned LLZO powder, 4.59kg of ammonium dihydrogen phosphate, 0.2kg of nano-alumina, and 1.81kg of nano-titanium dioxide into a high-speed mixer and mix evenly, then put it into a sagger, and enter a sealed roller kiln for sintering. It is 1000℃, and the sintering time is 6h. During the sintering process, an app...

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Abstract

The invention discloses solid electrolyte LLZO powder and a preparation method thereof. The solid electrolyte LLZO powder comprises an inner core and a coating layer coating the inner core, specifically; the inner core is solid electrolyte LLZO, and the coating layer is solid electrolyte LATP. According to the preparation method of the solid electrolyte LLZO powder, gas capable of removing carbon dioxide is used in the high-temperature treatment process, so that the lithium carbonate content on the surface of the LLZO is reduced; by using a solid electrolyte material LATP as a coating material, the surface of the LLZO is uniformly coated with another solid electrolyte material LATP as the coating material, and the LATP is stable in air, so that the LLZO coated with the LATP is also stable in air; compared with the prior art, the method is simple and easy to implement, the production cost can be effectively reduced, negative effects on materials are avoided, and large-scale production can be achieved.

Description

technical field [0001] The invention relates to the technical field of solid electrolyte materials, in particular to a solid electrolyte LLZO powder and a preparation method thereof. Background technique [0002] With the promotion of national policies and the large-scale application of lithium-ion batteries in digital and electric vehicles, lithium-ion batteries are favored. However, the safety of liquid electrolytes currently used in lithium-ion batteries is very poor, which often leads to safety issues for lithium-ion batteries. The future trend is to use solid electrolytes instead of liquid electrolytes, and LLZO solid electrolytes have higher conductivity and simpler preparation processes, and are currently the most used solid electrolytes. However, the surface properties of LLZO are unstable, and it is easy to react with carbon dioxide in the air to form a lithium carbonate layer, which is not conducive to material application. [0003] At present, there are mainly c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M2300/0071H01M2300/0094Y02E60/10
Inventor 王伟东
Owner 王伟东
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