CuO/Cu nanowire negative electrode material in core-shell structure and preparation method and application thereof

Abstract

The invention discloses a CuO / Cu nanowire negative electrode material in a core-shell structure and a preparation method and application of the CuO / Cu nanowire negative electrode material. The CuO / Cu nanowire negative electrode material is mainly composited from CuO and Cu, wherein the Cu is in a nanowire shape, the CuO is flower-like, the Cu serves as an inner core of the nanowire negative electrode material, and the CuO is coated on the outer surface of the Cu to form the core-shell structure. The preparation method comprises the following steps: copper acetate, ethidene diamine and a hydrazine hydrate solution are added in a sodium hydroxide solution, the mixture is sealed and then put into a water bath of 60-80 DEG C to be heated to obtain a copper nanowire suspension liquid, then the copper nanowire is separated, washed, and immersed in hydrogen peroxide, the flower-like CuO grows on site on the surface of the copper nanowire, and is separated, washed and dried to obtain the CuO / Cu nanowire negative electrode material in the core-shell structure. The CuO / Cu nanowire negative electrode material in the core-shell structure can be used to prepare a negative electrode for a high-conductivity lithium ion battery, and has better electrical conductivity and mechanical property.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a CuO / Cu nanowire negative electrode material and a preparation method and application thereof. Background technique [0002] With the increasing demand for lithium-ion batteries to be used as large and medium-power power sources in electric vehicles, hybrid vehicles and electric bicycles, higher requirements are placed on the performance of their positive and negative electrode materials. At present, the anode materials of commercial lithium-ion batteries are mainly carbon materials, but their limited theoretical capacity (372mAh / g) can no longer meet the requirements of the development of a new generation of high-performance lithium-ion batteries. [0003] CuO has a high lithium storage capacity. If it is considered that one CuO molecule intercalates two lithium ions, its theoretical capacity is 670mAh / g, which is more ...

AI Technical Summary

Problems solved by technology

However, in practical applications, it is often found that granular CuO / Cu composite powders are used as negative electrode materials for lithium-ion batteries, and the improvement of conductivity is very limited, because copper particles are distributed in CuO particles and cannot form a conductive network; while thin-film electrodes It is not conducive to the processing and assembly of electrodes, and the preparation process requires high temperature and high pressure equipment, and the process is more complicated

CN102629685A Chinese patent document reports a kind of copper acetate, pyrrole monomer as raw material, under high temperature and high pressure to prepare Cu 2 O / Cu / PPy nanowire lithium ion battery negative electrode material method, but this composite nanowire does not form a core-shell structure, and uses high temperature and high pressure equipment, the cost is high, and it is not easy to expand production

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