A kind of electrochemical preparation method of solid electrolyte lithium lanthanum titanium oxide compound

Abstract

The invention belongs to the field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium lanthanum titanium oxide compound. In the present invention, firstly, lanthanum oxide is intercalated with an appropriate amount of lithium ions by an electrochemical method, and then titanium salt is added according to the ratio of lithium, lanthanum and titanium to form a uniform mixture, and annealed to obtain perovskite-type LLTO. The invention can precisely control the content of lithium by controlling the discharge electric quantity, so as to obtain high-purity lithium lanthanum titanium oxide compound. The invention can accurately control the ratio of lithium lanthanum to titanium, and solves the problem of low product purity due to the volatilization of lithium salt at high temperature in the usual solid-phase method. At the same time, the raw material is cheap and the process is simple. It can be achieved by two steps of electrochemical and high temperature treatment. Obtain high-purity lithium lanthanum titanium oxide compound.

Description

[0001] (1) Technical field [0002] The invention belongs to the field of lithium ion batteries, in particular to an electrochemical preparation method of a solid electrolyte lithium lanthanum titanium oxide compound. [0003] (2) Background technology [0004] 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. [0005] In the solid electrolyte, the perovskite structure compound lithium lanthanum titanium oxide compound Li 3x La 2 / 3-x TiO 3 (LLTO) room temperature ionic conductivity up...

AI Technical Summary

Problems solved by technology

At present, the common methods for synthesizing lithium lanthanum titanium oxide compounds 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 reduced 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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