Electrode material of lithium-ion battery and preparation method thereof

Abstract

The invention belongs to the technical field of electrochemistry, material chemistry and chemical power products, and more particularly, relates to an electrode material of a lithium-ion battery and apreparation method thereof. The chemical formula of the electrode material provided by the invention is MNb11O29, wherein M is Al, Ga or Cr. As a negative-electrode material of the lithium-ion battery, the electrode material provided by the invention has the advantages of high theoretical specific capacity, high safety performance, high reversible specific capacity, high coulombic efficiency, excellent cycling performance and the like. The preparation method provided by the invention is simple in synthesis process, is applicable to charging and discharging of high-power devices such as electric vehicles, and has a wide application prospect in the field of the lithium-ion battery. The electrode material and the preparation method thereof have the advantages that more selections are provided for using the M-Nb-O material in the negative-electrode material of the lithium-ion battery, the application prospect is wide in the field of electric vehicles using the lithium-ion battery, and thepromotion of the electric vehicles is accelerated.

Description

technical field [0001] The invention belongs to the technical fields of electrochemistry, material chemistry and chemical power supply products, and more specifically relates to an electrode material of a secondary lithium ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high energy output, high conversion efficiency, and long storage life, lithium-ion batteries are recognized as a very promising energy source for electric vehicles. As a traditional commercial anode material, graphite has a high specific capacity (theoretical 372 mAh g -1 ), In addition, low cost, long cycle life, etc. are also its advantages. However, its working potential is very low, and after the first discharge below 1V, the electrolyte begins to decompose, forming a solid electrolyte interfacial film on the surface of the negative electrode. When charging and discharging at a high rate, the solid electrolyte interfacial film easily leads to the prec...

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Problems solved by technology

[0005] In view of the fact that very few M-Nb-O materials are used in lithium-ion batteries in the prior art, the purpose of the present invention is to provide a new electrode material for secondary lithium-ion batteries, aiming at solving the problem of only a few M-Nb-O materials. The material can be selected as the negative electrode material of lithium-ion battery, which leads to the problem that electric vehicles cannot be promoted

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