Lithium ion battery anode material and preparation method thereof

Abstract

The invention discloses a preparation method of a lithium ion battery anode material. The method is characterized in that the outer surface of the existing lithium ion battery anode material is sequentially coated with an aluminum oxide layer and a carbon layer, wherein the coating condition is liquid-phase coating, in the coating process of the aluminum oxide, the addition sequence of the existing lithium ion battery anode material and aluminum salt is adjusted, and the coating substance organic aluminum salt is added under the continuously stirring condition, so that a hydrolytic product is uniformly adsorbed onto the surface of an active substance. The carbon coating is carried out through a spray drying and rapid sintering way in the inert gas atmosphere, so that the problems that the metal is reduced due to the high-temperature carbon coating and the organic carbon source is difficultly carbonized in low temperature can be avoided. The invention also discloses a lithium ion battery anode material prepared through the method. The energy density and power density of the battery can be remarkably improved, and the cycling performance, the capacity retention rate and the safety performance of the battery can be improved.

Description

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a novel lithium ion battery cathode material and a preparation method thereof. Background technique

[0002] In the 1980s, American scholar J.B.Goodenough and others first discovered lithium cobalt oxide (LiCoO 2 ), lithium nickelate (LiNiO 2 ) and lithium manganate (LiMn 2 o 4 ) can be used as a material for deintercalating lithium ions. In the 1990s, Sony successfully applied lithium cobalt oxide to commercial small electronic products for the first time. Since then, lithium-ion batteries have been widely used in various electronic devices due to their high cycle performance, high operating voltage and low pollution. In recent years, with the continuous development of science and technology, the functions of electronic equipment have been continuously upgraded, so higher requirements have been placed on the energy and rate performance of lithium batteries. At present, c...

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