Copper-copper oxide integrated negative electrode for lithium ion battery based on hollow tubular three-dimensional nanoporous structure and preparation method

Abstract

The invention provides a copper-copper oxide integrated negative electrode for a lithium ion battery based on a hollow tubular three-dimensional nanoporous structure, which is composed of copper and a copper oxide film with a hollow tubular three-dimensional nanoporous structure, and the copper oxide film is CuO film or Cu 2 O film or CuO and Cu 2 A mixed film of O, and the copper and copper oxide films are integrated; the copper oxide film is a continuous integrated film formed in situ by partial oxidation of the three-dimensional nanoporous copper surface, and constitutes a core-shell structure three-dimensional nanoporous copper- Copper oxide precursor, and then partially selectively corrode the pore wall core of the above-mentioned three-dimensional nanoporous copper-copper oxide with a core-shell structure to form a copper-copper oxide integrated negative electrode of a lithium-ion battery with a hollow tubular three-dimensional nanoporous structure. The invention also provides a preparation method of the negative electrode. The method provided by the invention can simplify the production process of the negative electrode of the lithium ion battery and effectively improve the specific capacity and cycle performance of the negative electrode of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of negative electrodes of lithium ion batteries, and relates to a copper-copper oxide integrated negative electrode of lithium ion batteries based on a hollow tubular three-dimensional nanoporous structure and a preparation method. Background technique [0002] Due to the extensive use of non-renewable resources such as oil, coal and natural gas, not only will it cause environmental problems, but it will eventually face the problem of resource depletion. Therefore, in recent years, scholars and experts around the world are committed to finding and developing green renewable energy such as wind energy, solar energy, water energy and tidal energy, so as to promote the development of a green and environment-friendly economy. These clean energies all need the effective support of energy storage / conversion devices to compensate for their poor supply continuity and large fluctuations. As a renewable energy storage device, ...

AI Technical Summary

Problems solved by technology

However, cuprous oxide has two disadvantages as a negative electrode material: (1) copper oxide is a semiconductor material with poor conductivity; (2) copper oxide is a transition metal oxide, and its cycle stability is poor

This method and the lithium-ion battery negative electrode prepared by it have the following disadvantages: (1) the production process is cumbersome, which is not conducive to the reduction of production cost and the realization of large-scale production; (2) the active material is made into powder, and then mixed with conductive agent and adhesive The mixture is made into slurry and coated on the conductive current collector, and then used as an electrode after drying

Among them, the binder itself is not conductive, which will hinder electron transmission, increase electrode polarization and impedance, resulting in poor rate performance; (3) During the charging and discharging process of lithium-ion batteries, the insertion and extraction of lithium ions will cause huge Volume change, the binding force between the active components bonded by the binder, and between the active components and the copper foil is also relatively limited, and the active components will easily fall off and fail during the huge volume change process of charging and discharging.

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