Preparation method of LLZO powder

Abstract

The invention provides a preparation method of LLZO powder. The LLZO powder is prepared by adopting soluble lithium acetate as a lithium source, water as a solvent medium and ZrO2 with high specific surface area as a coating template of a lithium salt through simple mechanical ball-milling and drying and calcining methods. According to the method, reduction of the grain size is facilitated, reduction of the calcination temperature is facilitated, the grain size of the prepared LLZO powder is in nanoscale, the phase is single and the energy consumption is low. The problem that the excessive lithium source needs to be added to compensate the loss of a lithium element due to high temperature in synthesis and sintering when the powder is synthesized is solved; and a compact sheet body with good lithium ion conductivity can be further obtained through granulation, compaction and sintering.

Description

Technical field [0001] The invention belongs to the technical field of lithium lanthanum zirconium oxide oxide, and specifically relates to a method for preparing lithium lanthanum zirconium oxide powder. Background technique [0002] Traditional commercial lithium-ion batteries use organic electrolyte, which has potential safety hazards such as electrolyte leakage, combustion, and explosion. Lithium-sulfur, lithium-air batteries, as well as new battery negative electrodes to increase energy density often use metal lithium. The generation of lithium dendrites can cause short circuits in the battery and affect safe use. All-solid-state batteries using solid electrolytes, due to their non-flammable, non-corrosive, non-leakage, and ability to prevent the growth of lithium dendrites, fundamentally solve the battery short-circuit problem, improve safety, and are also beneficial to high Invention and application of energy density batteries. [0003] Inorganic oxide lithium ion conducto...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the above-mentioned technical status of LLZO, the present invention aims to improve the preparation method of LLZO powder, reduce the grain size of LLZO powder on the one hand, and reduce the temperature in the preparation process on the other hand, thereby not only reducing energy consumption, but also avoiding the It is necessary to add an excess lithium source to compensate for the loss of lithium due to high temperature during synthesis and sintering.

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