Preparation method of lithium ion battery anode material

Abstract

The invention discloses a preparation method of lithium ion battery anode material. The method comprises the following steps: A. mixing Li2CO3, Al2(SO4)3 and Co3O4 in certain mol ratio; B. adding solvent in the obtained mixture for wet-grinding; C. removing solvent and drying; D. porphyrizing; E. roasting at high temperature; and F. cooling to obtain lithium, aluminum and cobalt oxide anode material. In the invention, metallic aluminum ions are doped in the preparation process of lithium ion battery anode material to exert synergistic effect, so as to prepare excellent performance lithium cobaltate doped with aluminum ions. The anode using the material can maintain stable structure after circulating for a long time, thus enhancing capacity retention rate.

Description

technical field

[0001] The invention relates to a lithium ion battery cathode material, in particular to a preparation method of a layered lithium aluminum cobalt oxide cathode material for a lithium ion battery. Background technique

[0002] At present, the positive electrode active materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide and vanadium oxide. LiNiO 2 It is easy to form non-stoichiometric compounds during the preparation process, resulting in unstable electrochemical performance and intolerance to overcharging. LiMn 2 o 4 Overcharge resistance, good safety performance, but poor cycle performance, fast capacity decay at high temperature. V 2 o 5 Lithium and its derivatives can dissolve to a certain extent in organic solvents and have strong oxidizing properties. During the process of lithium deintercalation, it can lead to the decomposition of organic solvents. LiCoO 2 Due to its easy prepara...

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