A metal elemental copper/lithium iron phosphate/carbon composite material and its preparation method and application

Abstract

The present invention discloses a novel metallic single substance copper / lithium iron phosphate / carbon composite material and a preparation method thereof, and applications. Metallic single substance copper and lithium iron phosphate composite materials of different mass ratio are synthesized via a two step method. A crystal phase structure analysis of the metallic single substance copper / lithium iron phosphate / carbon composite material shows that: main peak shapes of obvious lithium iron phosphate and metallic single substance copper are appeared without obvious impurity peak shape(s). Amicroscopic appearance SEM analysis shows that: the granularity of the composite material is obvious, the dispersity is relative good, and the particle size is mainly 400 nm. The hystersis loop at theroom temperature shows that: the introduction of copper allows the magnetization (Ms), the residual magnetization (Mr) and the area of hysteresis loop of the composite material decrease as the amountof copper increases.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and in particular relates to a novel metal elemental copper / lithium iron phosphate / carbon composite material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have been receiving much attention since their introduction in 1991, among which lithium iron phosphate (LiFePO 4 ) As an important component of lithium-ion batteries, the positive electrode material has gradually become the focus of research. Olivine-structured lithium iron phosphate (LiFePO 4 ) is a lithium-ion battery cathode material proposed by J.B.Goodenough et al. in 1997. Because lithium iron phosphate (LiFePO 4 ) has the advantages of long service life, rich and cheap raw material sources, high theoretical battery capacity, non-toxic, non-polluting, environmentally friendly, good cycle performance, and good safety performance, making lithium iron phosp...

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Problems solved by technology

[0003] However, at present, there are few relevant reports on the simple copper lithium iron phosphate carbon composite material. The method for preparing and synthesizing lithium iron phosphate is mainly a solid phase method. The synthesis process of this method is complicated and the cost is high. There is only one patent application for lithium iron phosphate material, which is: CN103779563A (method for preparing copper-carbon-coated lithium iron phosphate) of Chongqing Terui Battery Materials Co., Ltd. This method is mainly synthesized by solid-phase method, and the synthesis process is complicated , the problem of high cost

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