Electrochemical preparation method of solid electrolyte lithium aluminum titanium phosphate

Abstract

The invention relates to the technical field of lithium ion batteries, in particular to an electrochemical preparation method of solid electrolyte lithium aluminum titanium phosphate. The electrochemical preparation method comprises the following steps of firstly, preparing a mixture of aluminum oxide and titanium dioxide according to the ratio of aluminum to titanium; secondly, embedding the titanium dioxide into lithium ions through an electrochemical method; thirdly, adding phosphor salts according to the ratio of lithium to aluminum to titanium to phosphorus to form a uniform mixture, and annealing to obtain an LATP solid electrolyte. The electrochemical preparation method disclosed by the invention is low-priced in raw materials and is simple in process; high-purity lithium aluminum titanium phosphate can be obtained by an electrochemical step and a high-temperature treatment step; the ratio of the lithium to the aluminum to the titanium to the phosphorus can be accurately controlled, and the problem that the purity of products is lower caused by volatilization of lithium salts at high temperature in a general solid-phase method is solved.

Description

(1) Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium titanium aluminum phosphate. (2) Background technology [0002] The popularity of new energy vehicles can reduce environmental pollution, among which power batteries are the key factor. Power batteries usually use liquid electrolytes, which may cause fire or explosion under abuse, posing safety hazards. All-solid batteries using solid electrolytes do not use flammable liquid electrolytes, and their safety is greatly improved. At the same time, all-solid batteries have more storage capacity and higher output power, but the low ionic conductivity of solid electrolytes hinders all-solid batteries. practical. [0003] In the solid electrolyte, lithium titanium aluminum phosphate Li 1+x Al x Ti 2-x (PO 4 ) 3 (LATP) room temperature ionic conductivity up to 10 -3 S / cm, which is close to the le...

AI Technical Summary

Problems solved by technology

At present, the common methods for synthesizing lithium titanium aluminum phosphate mainly include solid-phase method and sol-gel method. The solid-phase method has a simple process, but long-term high-temperature calcination leads to high energy consumption, and the product purity is low due to the volatilization of lithium salt at high temperature. Low, the sol-gel method uses expensive alkoxide, the cost is very high, only suitable for laboratory research

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