Preparation method of porous nickel current collector for lithium ion battery

Abstract

The invention relates to a preparation method of a porous nickle current collector of a lithium ion battery and relates to the field of materials of lithium ion batteries. The preparation method comprises the following steps: granulating to obtain mixed powder by adopting nickle oxide and graphite as initial materials; pressing into a green blank body and calcining to obtain a blank body; reducing the blank body to obtain a porous nickle current collector of the lithium ion battery; mixing and grinding a transition-metal-oxide negative material with a nano structure, a bonding agent and a pore forming agent, then uniformly coating the surface of the porous nickle current collector of the lithium ion battery with the mixture I, and sintering to obtain an electrode of the lithium ion battery; uniformly mixing a lithium source, an iron source, phosphate radical solution and an organic complexing agent, coating the surface of the porous nickle current collector of the lithium ion battery with the mixture II; and ageing and calcining to obtain a thin-film electrode made of lithium iron phosphate. The porous nickle current collector of the lithium ion battery has the advantages that due to good communicating characteristics, electrons can be relatively well transferred; due to a relatively high three-phase interface, electrolyte and a negative electrode can be relatively well infiltrated mutually; the thin-film electrode made of the lithium iron phosphate has the communicated three-phase interface, so that the convenience is brought for improving the electro-chemical dynamic characteristics of the material.

Description

technical field [0001] The invention relates to the field of lithium-ion battery materials, in particular to a preparation method of a porous nickel current collector for a lithium-ion battery. Background technique [0002] As the application fields of lithium-ion batteries become wider and wider, lithium-ion batteries are developing in the direction of high energy density, high power density and high safety. This requires lithium storage materials to have higher operating voltage or higher reversible capacity. Traditional lithium-ion batteries use two compounds that can intercalate / deintercalate lithium ions as the positive and negative materials of the lithium-ion battery, respectively. For example: In 1990, Sony Corp. developed a graphite / lithium cobalt oxide system battery and successfully commercialized it. Subsequently, with the further deepening of the concept of electric vehicles, graphite / lithium iron phosphate batteries have also developed rapidly worldwide. [...

AI Technical Summary

Problems solved by technology

[0005] However, there is a high-temperature calcination process in the process of preparing electrode materials mentioned above to improve the structural stability of the material, so the use of a 3D structure current collector such as foamed nickel will inevitably cause collection problems due to insufficient mechanical strength of the current collector. The problem of fluid pulverization