Heteroatom doped graphene coated composite electrode material and preparation method thereof

Abstract

The invention discloses a heteroatom doped graphene coated composite electrode material and a preparation method thereof, firstly an electrode material and a catalyst are mixed to obtain a mixed precursor for catalytic chemical vapor deposition in the presence of both a compound containing a carbon source and a compound containing a doping source to obtain the heteroatom doped graphene coated composite electrode material. The composite electrode material comprises the electrode material and doped graphene coating the surface of the electrode material, and the doped atom is any one or a combination of at least two of boron, sulfur or phosphorus, in the heteroatom doped graphene coated composite electrode material, a heteroatom doped graphene coating layer has good uniformity and less lamination, the heteroatom doped graphene coating layer is uniformly and tightly combined with an electrode material matrix, is not easy to fall off, not easy to agglomerate and wrinkle, and conducive to improvement of the performance of electrical contact with the electrode material matrix, can protect the surface of the electrode material from erosion, can significantly improve the properties of the electrode material, and enhances the electrical conductivity and the cycle life of the electrode material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and relates to a heteroatom-doped graphene-coated composite electrode material and a preparation method thereof, in particular to a heteroatom-doped graphene-coated composite electrode material and its use of catalytic chemistry. Catalytic Chemical Vapor Deposition (CCVD) realizes the in-situ growth of heteroatom-doped graphene and coats the surface of electrode materials to prepare composite electrode materials. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have many advantages, such as high operating voltage, high energy density, high power density, long cycle life, low self-discharge rate, no memory effect, and environmental friendliness. Therefore, since the commercial application of lithium-ion batteries in the 1990s, they have been widely used in digital 3C products, electronic medical instruments, aerospace and mili...

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Problems solved by technology

[0005] At present, the application of graphene in battery cathode materials is simply dispersed coating, which is difficult to greatly improve the electrochemical performance of the battery; and the doped graphene currently used in the modification of lithium-ion battery cathode materials is only nitrogen-doped. Doped graphene, this kind of doped graphene has limited performance improvement of the battery, and the preparation method is roughly: mix graphene oxide, lithium-ion battery positive electrode materials and doping sources through solid phase or liquid phase, in the During the high-temperature reduction process, heteroatoms are doped into graphene and coated on the surface of lithium-ion battery cathode materials, and the preparation process is cumbersome

So far, there are no documents and patents related to the in-situ growth of doped graphene-coated lithium-ion battery cathode materials

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