A preparation method of chromium and silver double metal doped nano-tungsten oxide@porous carbon negative electrode material

Abstract

The invention discloses a preparation method of a chrome and silver dual-metal-doped nanometer tungsten oxide@ porous carbon negative electrode material. The preparation method comprises the steps ofadding sodium tungstate, chromium nitrate, silver nitrate and 1, 2, 4-triazole into deionized water to prepare a mixed solution, then adding porous carbon powder into the mixed solution, performing stirring by a magnetic stirrer, adjusting the pH value by dilute nitric acid to 1-2, next, performing a reaction at a temperature of 150-160 DEG C for 3-5days, naturally cooling to the room temperatureand performing filtering, and performing washing by deionized water and ethyl alcohol, and carrying out drying; performing roasting on the dried powder in a nitrogen environment; and after roasting iscompleted, performing furnace cooling to the room temperature to obtain the roasted product which is the chrome and silver dual-metal-doped nanometer tungsten oxide@ porous carbon material. The chrome and silver dual-metal-doped nanometer tungsten oxide@ porous carbon product prepared in the invention has the advantages of fine and smooth structure, high conductivity and the like.

Description

technical field [0001] The invention relates to a method for preparing a chromium-silver bimetal doped nano-tungsten oxide@porous carbon negative electrode material, which belongs to the technical field of lithium-ion batteries. Background technique [0002] The development of science and technology and the improvement of the quality of human life; the crisis of oil resources and the deteriorating ecological environment of the earth have formed a dual social background for the rapid development of technology and industry in the field of new secondary batteries and related materials. On the one hand, it is the rapid change of information technology and information industry. Mobile phones, laptop computers, and all kinds of portable electrical appliances emerge in an endless stream; on the other hand, air pollution, the lack of oil reserves on the earth, and the support of reserve technologies. The urgent demand of the market has led to the emergence of new secondary batterie...

AI Technical Summary

Problems solved by technology

[0003] Nano-transition metal oxides (MO, M=Co, Ni, Cu, Fe, W) anodes have good lithium storage properties, and many other transition metal oxides such as CuO, Fe 2 o 3 、Co 3 o 4 、WO 3 transformation reaction Lithium storage, compared with carbon materials, transition metal oxides have a higher capacity, but the diffusion coefficient of electrons or ions of these transition metal oxides is small, making their conductivity poor and the reversibility of electrode reactions reduced. , the specific capacity decays rapidly with the charge-discharge cycle

Among them WO 3 It is the most stable oxide of tungsten at room temperature. It has low environmental toxicity, low price, and high theoretical specific capacity (693mAh∙g-1). It is a negative electrode material for lithium-ion batteries with development potential. However, bulk WO 3 The low conductivity and large volume change during charge and discharge lead to poor rate performance and cycle stability.

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