Preparation method for self-active lithium titanate material

Abstract

The invention discloses a preparation method for a self-active lithium titanate material. The preparation method comprises the following steps: step 1, adding lithium acetate into absolute ethyl alcohol, and carrying out uniform stirring for 1-3 hours so as to obtain a lithium alcohol solution; step 2, adding titanium monoxide powder into the lithium alcohol solution, and carrying out low-temperature ultrasonic treatment for 2-4 hours so as to obtain a mixed turbid liquid; step 3, uniformly spraying the mixed turbid liquid into a sealed reaction kettle, carrying out standing for 1-2 hours at aconstant temperature, and carrying out decompressing and cooling so as to obtain coated titanium monoxide particles; step 4, adding the coated titanium monoxide particles into a mold, and carrying out a constant-temperature and constant-pressure reaction for 2-4 hours so as to obtain a primary lithium titanate plate; and step 5, soaking the primary lithium titanate plate into tetrabutyl titanate,carrying out low-temperature ultrasonic treatment for 3-5 hours, then carrying out an extrusion reaction for 2-4 hours in a humid environment, and carrying out sintering so as to obtain the self-active lithium titanate material. According to the invention, the problem of poor conductivity of lithium titanate is solved; and titanium monoxide is used as an inner core, and lithium titanate is endowed with oxygen deficiency by utilizing the oxygen deficiency of the titanium monoxide, so an electron-hole structure of the lithium titanate is realized, and the overall conductivity and activity are greatly improved.

Description

technical field [0001] The invention belongs to lithium battery materials, in particular to a preparation method of a self-active lithium titanate material. Background technique [0002] Lithium titanate "zero-strain material" is being increasingly used in lithium-ion batteries due to its superior cycle performance, good rate and reliable safety. Lithium titanate has a three-dimensional lithium ion diffusion channel unique to the spinel structure, Li + The diffusion coefficient is 2*10 -8 cm 2 / S, which is more than 10 times that of graphite, makes it have obvious advantages of fast charging and good high and low temperature performance; in addition, it has good safety, long life, and environmental protection, making it suitable for electric buses, energy storage, and high-power Equipment and other fields have broad application space. Especially in the field of energy storage, with the continuous deepening of my country's power system reform and the rise of the energy In...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems in the prior art, the present invention provides a preparation method of self-active lithium titanate material, which solves the problem of poor conductivity of lithium titanate, uses titanium monoxide as the core, and uses its oxygen deficiency to endow titanium Oxygen deficiency of lithium titanate, thus realizing the electron-hole structure of lithium titanate, greatly improving the overall conductivity and activity