Preparation method of lithium ion battery negative electrode and application thereof in lithium ion battery

Abstract

The invention relates to a preparation method of a lithium ion battery negative electrode material. The preparation method comprises the following steps of (1) preparing a silicon dioxide nanorod on carbon cloth, (2) growing cobalt nickel sulfide on the surface of silicon dioxide through an electrochemical deposition method, (3) putting the carbon cloth obtained in the step (2) into a NaOH solution to etch SiO2 so as to obtain carbon cloth loaded with hollow nanotube nickel sulfide cobalt, (4) putting the carbon cloth in the step (4) into an HAuCl4 solution, performing ultrasonic treatment, and performing microwave radiation to obtain a hollow tube nickel sulfide cobalt / Au nanoparticle composite material. The preparation process is simple and efficient, and the negative electrode materialhas excellent cycle performance and rate capability when applied to the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of battery technology. Background technique [0002] In recent years, with the rapid development of 3C digital products, energy storage, communications and new energy vehicles, people have increasingly stringent requirements on the performance of lithium-ion batteries. Graphite negative electrodes and silicon electrodes are limited in scope of use due to their own defects. Therefore, it is necessary to provide a new high-capacity and high-cycle negative electrode material to promote the development of lithium-ion battery negative electrode materials. Transition metal sulfides, as novel anode materials, have high specific capacity performance, however, their poor conductivity, large volume change and severe capacity fading during charge-discharge cycles as anodes for rechargeable lithium-ion batteries hinder their Use in rechargeable batteries. Therefore, how to further improve its structure to improve its cycle stab...

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Problems solved by technology

[0003] CN111293300A discloses a zinc-cobalt sulfide / carbon nano negative electrode material and its preparation method, first prepares ZIF-8, then hydrothermally prepares ZIF-8@ZIF-67; mixes it with carbon precursor to prepare ZIF-8@ ZIF-67; the product is calcined with S at high temperature to obtain zinc cobalt sulfide / carbon nano negative electrode material; CN109768233A discloses a lithium ion battery NiCo 2 S 4 / The preparation method of graphene composite negative electrode material, resin is joined in catalyst metal salt solution, and this metal salt solution is the mixture of nickel salt solution and cobalt salt solution, stirs, dries, pulverizes; Add pore-forming agent, in inert atmosphere Under the protection of high-temperature treatment, the product and sulfur-containing compound are formulated into a mixed solution, and hydrothermal reaction is carried out. Under the protection of an inert atmosphere, the negative electrode material is obtained by high-temperature treatment; on the one hand, the structure of the sulfide is not easy to control, on the other hand , the whole process is complicated, and the reaction time is very long, which is very unfavorable for industrial production

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