Method for preparing lithium ion battery positive electrode material lithium vanadium oxide LiV3O8

Abstract

The invention discloses a method for preparing a lithium ion battery positive electrode material lithium vanadium oxide LiV3O8. The method comprises the following two steps: (1) carrying out ball milling and complete and uniform mixing on a coordination agent and raw materials for preparing a lithium vanadium oxide LiV3O8 by using a solid phase coordination method, placing in a muffle furnace, carrying out thermal insulation at a temperature of 80 DEG C in an air atmosphere, heating to a temperature of 350 DEG C, sintering, cooling, and crushing to form a mixture; and (2) carrying out pair roller pre-pressing on the mixture prepared in the step (1), sintering at a temperature of 550 DEG C, cooling, and crushing to obtain the product. According to the present invention, the target product is synthesized by combining the solid phase coordination method and the post-sintering process, such that the method of the present invention can overcome the disadvantages of insufficient reaction caused by the insufficient atom contact, not good product particle size and the like of the solid phase direct reaction, has advantages of easy operation and easy industrialization compared with the liquid phase reaction, and can obtain good performance products at a temperature lower than the direct solid phase reaction.

Description

technical field [0001] The invention relates to a lithium vanadium oxide lithium vanadium oxide LiV for preparing lithium ion battery cathode material 3 o 8 method, especially involving a solid-phase coordination method to prepare LiV 3 o 8 The method belongs to the field of lithium ion electrode materials and preparation methods thereof. Background technique [0002] As a cathode material for lithium-ion batteries, layered lithium vanadium oxide LiV 3 o 8 It has excellent lithium intercalation ability, high specific capacity, long cycle life, etc., and largely overcomes the shortcomings of lithium cobalt, lithium nickel, and lithium manganese oxide materials that cannot withstand deep discharge, etc., and has huge potential commercial development potential. However, it also has significant disadvantages. As a cathode material for lithium-ion batteries, the phase transition is complicated during the intercalation and extraction of lithium ions, the voltage platform is ...

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Problems solved by technology

Through the comparison of various synthesis methods, it can be seen that the lithium vanadium material prepared by the liquid phase method has better electrochemical performance, but its synthesis method is relatively cumbersome and the degree of industrialization is difficult; although the preparation process of the solid phase method is relatively simple, it is also very easy for industrialization. However, the sintering temperature is generally above 680°C for more than 24 hours, and the electrochemical performance is not very ideal. This is mainly due to the fact that it is difficult to reach the level of molecular contact in the liquid phase method during the preparation process of the solid phase method, resulting in poor mixing of the reactants. Uniform, insufficient contact

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