Lithium-ion battery anode material structure, lithium-ion battery and preparation method thereof

Abstract

The invention provides a lithium ion battery anode material structure, a lithium ion battery and a preparation method of the lithium ion battery anode material structure. The preparation method comprises the steps of: (1), putting a silicon nano-material, a carbon nano-material and an additive in an organic solvent to prepare dispersion liquid; (2), providing a metal catalytic substrate, and coating the dispersion liquid on the upper surface of the metal catalytic substrate; and (3), forming a graphene film on the upper surface of the structure obtained in the step (2). According to the battery anode material structure provided by the invention, the inherent characteristics of the silicon anode material and graphene are reserved; furthermore, the synergistic effect between the silicon anode material and graphene can be played; simultaneously, effective contact between a silicon nano-material / carbon nano-material composite film and a metal catalytic substrate current collector can be realized; high-efficiency lithium storage capability can be provided; furthermore, great volume change of the silicon nano-material in a charging and discharging process can be relieved; and generation of the internal stress of the anode material can be effectively inhibited and improved, so that pulverization of the anode material can be avoided.

Description

technical field [0001] The invention belongs to the technical field of material preparation and processing, and in particular relates to a negative electrode material structure of a lithium ion battery, a lithium ion battery and a preparation method thereof. Background technique [0002] Since Japan's Sony Corporation successfully developed the first generation of lithium-ion batteries, due to its high energy density, long cycle life and low environmental pollution, it has become the preferred battery for most portable electronic devices. A lithium-ion battery consists of a positive electrode, a negative electrode, an electrolyte, and a separator. Usually, the positive electrode of lithium ion is made of lithium-containing metal compound (such as lithium cobalt oxide (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) and lithium manganate (LiMn 2 o 4 )constitute. The negative electrode is composed of materials that can store lithium ions, such as carbon, transition metals, ...

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Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a lithium-ion battery negative electrode material structure, a lithium-ion battery and a preparation method thereof, for solving the existing theory of graphite in the prior art as a lithium-ion battery negative electrode. The problems of low specific capacity and poor charge and discharge ability, and the problems of large changes in temperature and poor cycle stability of silicon as the negative electrode of lithium-ion batteries

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