Lithium iron phosphate anode material and its preparing method

Abstract

The invention relates to ferric phosphate lithium anode material and its preparing method, which relates to a cell anode material, especially to a ferric phosphate lithium anode material used in lithium ion cell second time. It provides a cell anode material and ití»s preparing method which can elevate the LiFePO4 conductivity and tap density at the same time. It is formed by ferric phosphate lithium and calcium boride (by weight rate): ferric phosphate lithium: calcium boride=100í† (1.01- 5.26). It first syntheses pure ferric phosphate lithium: it balls the ferrous salt, microcosmic salt and lithium salt by alcohol grease, heats the mixed material and uses inactive gas as preserving gas. It balls the synthesis ferric phosphate lithium anode and calcium boride, burns the mixed material and adds inactive gas as preserving gas to obtain the object product.

Description

technical field

[0001] The invention relates to a battery cathode material, in particular to a lithium iron phosphate cathode material mainly used in lithium ion secondary batteries. technical background

[0002] LiCoO is currently the mainstream cathode material for commercial lithium-ion secondary batteries on the market. 2 , but due to the increasing shortage of cobalt resources, the price of this material has been high, so people have always hoped to find a substitute for LiCoO 2 electrode material. Lithium iron phosphate (LiFePO 4 ) as a new type of cathode material for lithium-ion secondary batteries has attracted great attention recently. The reason is that it has good cycle performance, non-toxicity, environmental friendliness, and cheap advantages, and it is very hopeful that it can replace LiCoO 2 And become the cathode material of the next generation lithium ion secondary battery. But this material itself has two fatal shortcomings: low tap density and low el...

Images