Method for preparing anode material carbon coated lithium titanate for lithium ion power batteries

Abstract

The invention provides a method for preparing anode material carbon coated lithium titanate for lithium ion power batteries, and belongs to the technical field of electrochemical energy materials. According to the invention, titanium dioxides are coated with carbon firstly, and then technological processes of lithiation and calcining are performed, so that a carbon layer coated on the surface of the titanium dioxides both can effectively suppress the size increasing of particles in the process of sintering, and improves the electrical conductivity of lithium titanate materials; and in the process of lithiation, a small amount of lithium oxalate is added in lithium salts, thereby reducing the alkalinity of a solution, and facilitating the melting of TiO2 / C. The invention aims to overcome the defects of poor battery rate performance difference and the like caused by the fact that lithium titanate materials prepared by using the traditional solid phase method is large in particle size and poor in electronic conductivity, and provides a method for preparing carbon coated lithium titanate materials which can improve the battery rate performance. The method is simple in process operation, and suitable for large-scale production.

Description

Technical field

[0001] The invention relates to a preparation method of carbon-coated lithium titanate as a negative electrode material for a lithium ion power battery, and belongs to the technical field of electrochemical energy materials. Background technique

[0002] Lithium titanate is a promising anode material for lithium-ion batteries. Compared with traditional carbon anode materials, lithium titanate has obvious advantages as anode materials for lithium-ion batteries: Li 4 Ti 5 O 12 It has an obvious charging and discharging platform, and there is an obvious voltage mutation at the end of charging and discharging, and has good overcharge resistance and overdischarge resistance; the voltage platform is located at 1.55V (vs.Li / Li + ) Nearby, it is not easy to cause metal lithium to precipitate or produce dendrites, and there is no thermal runaway and short circuit in the battery cell; during the charge and discharge cycle, the cell volume changes 0.1%-0.3%, which is called "z...

Images