Preparation method and application of heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material

Abstract

The invention discloses a preparation method and application of a heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material. The heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material can be obtained by dispersing transition metal salts, fructose, cyanamide and the like in a solvent, uniformly mixing, carrying outrotary evaporation treatment, fully drying the obtained powder, carrying out high-temperature sintering in an inert atmosphere, and carrying out hydrothermal vulcanization treatment on the powder subjected to heat treatment by using thioacetamide. According to a composite electrode prepared from the heteroelement-doped carbon nano tube packaging metal sulfide composite negative electrode material, according to the characteristics in the charge-discharge cycle of the negative electrode material of the sodium-ion battery, the uniform carbon layer is packaged and coated outside the active substance, and the one-dimensional structure of the carbon nano tube is beneficial to improving electron conduction, so that the electrochemical performance of the electrode material is effectively improvedand improved. The preparation method is simple in operation process, high in yield, excellent in charge-discharge performance of the material and convenient for industrial production.

Description

technical field

[0001] The invention relates to the technical field of negative electrode materials for sodium ion batteries, in particular to a preparation method and application of heteroelement-doped carbon nanotube-encapsulated metal sulfide composite negative electrode materials. Background technique

[0002] The working principle of sodium-ion batteries is similar to that of lithium-ion batteries, using the intercalation process of sodium ions between the positive and negative electrodes to achieve charge and discharge. Compared with lithium-ion batteries, sodium-ion batteries have the following advantages: (1) Na-salt raw materials are rich in reserves and low in price. Compared with lithium-ion battery ternary cathode materials, the cost of raw materials is reduced by half by using iron-manganese-nickel-based cathode materials; ( 2) Due to the characteristics of sodium salt, it is allowed to use low-concentration electrolyte (with the same concentration electrolyte, ...

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