Secondary lithium-ion battery with aluminum, nickel, copper and graphite cloth as current collector

Abstract

The present invention relates to a secondary lithium ion battery adopting an aluminum-plated, nickel-plated and copper-plated graphite cloth as a current collector. The secondary lithium ion battery is characterized in that the graphite cloth substrate thickness is 140-300 [mu]m, the aluminum plating layer thickness is 1-8 [mu]m, the nickel plating layer thickness is 2-10 [mu]m, the copper plating layer thickness is 2-10 [mu]m, and the plating sequence is that a carbon layer is coated on a substrate, then a transition carbonization metal layer is coated, and finally a metal layer is coated. The concrete preparation method comprises: uniformly mixing a positive electrode active material, a negative electrode active material, an electric conduction agent and a binder in a suitable solvent, carrying out double-surface coating on an aluminum-plated, nickel-plated, and copper-plated graphite cloth by using a curtain coating manner, completely infiltrating, and finally carrying out vacuum drying and electrode plate pressing. According to the present invention, the utilization efficiencies of the positive electrode active substance and the negative electrode active substance are improved, and the capacity and the rate discharge performance of the lithium ion battery are substantially improved.

Description

technical field [0001] The invention relates to a secondary lithium-ion battery with aluminum, nickel and copper-plated graphite cloth as a current collector. In a single secondary lithium-ion battery, the material of the positive electrode current collector is aluminum-plated graphite cloth, and the material of the negative electrode current collector is nickel-plated Or copper-coated graphite cloth, which can be applied to energy storage, new energy vehicles and portable electronic products, and belongs to the technical field of lithium-ion batteries. Background technique [0002] At present, people's requirements for the energy density of secondary lithium-ion batteries are gradually increasing, and various scientific research institutes and battery manufacturers are constantly seeking new materials to promote the continuous improvement of battery performance. In addition to the continuous development of new cathode materials with higher energy density, the innovative dev...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional positive and negative current collector materials of secondary lithium ion batteries are aluminum foil and copper foil. The main disadvantage is that the positive and negative active materials can only be distributed on the surface of the current collector. The electron conduction rate and electron density and uniformity of the active material vary greatly

In order to improve this situation, the new current collector materials currently proposed mainly include foam metal, burr metal belt, metal mesh and other materials from the perspective of increasing the contact area with the active material; the problems existing in the traditional current collector materials: that is, positive and negative active materials It can only be distributed on the surface of the current collector, and the electron conduction rate, electron density and uniformity of the active material close to the current collector and the active material on the electrode surface are greatly different

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