Titanium carbide-loaded stannous sulfide composite anode material

Abstract

The invention relates to a titanium carbide-loaded stannous sulfide composite anode material. The composite anode material is a stannous sulfide anode material loaded with titanium carbide, wherein the loading capacity of titanium carbide is 3-9% of the mass of stannous sulfide. The composite anode material is prepared by the following specific method: mixing a sulfur source and a tin source, adding a solvent and stirring until the above substances are completely dissolved so as to obtain a sulfur-tin mixed solution; taking titanium carbide, adding a surfactant and deionized water, and carrying out ultrasonic oscillation until the substances are completely dissolved so as to obtain a titanium carbide dispersion; adding the titanium carbide dispersion into the sulfur-tin mixed solution, andtransferring the mixed solution into a reaction kettle to carry out a hydrothermal reaction; successively centrifuging, washing and drying the product after the reaction, and finally grinding to obtain a powder product; calcining the powder product in an inert gas atmosphere, cooling to room temperature with a furnace, and grinding the powder to obtain a product. This material shows better cycleperformance and rate performance than pure-phase stannous sulfide.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a composite negative electrode material loaded with titanium carbide and tin sulfide. Background technique [0002] As we all know, the electrochemical performance of lithium-ion batteries is mainly determined by its electrode materials, and the positive electrode materials of lithium-ion batteries have been relatively mature, so negative electrode materials have become a hot research topic at present. To become the negative electrode material of lithium-ion batteries, there must be some basic requirements for the performance of the material: first, the potential of the alloying process of lithium should be low, as close as possible to the potential of metal lithium, so that the output voltage of the battery is high, and the charge and discharge The voltage is stable during the process. Secondly, the specific capacity is high and the volume expansion is small dur...

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Problems solved by technology

[0004] The problem with the prior art is that the volume expansion of the stannous sulfide material results in poor cycle stability and poor rate performance

Aiming at the disadvantages of poor cycle performance and poor rate performance caused by the huge volume change of tin-based anode material SnS during charge and discharge, there are currently many studies on its modification, and the use of two-dimensional transition metal carbide Ti 3 C 2 The interlayer structure can effectively limit the volume effect of stannous sulfide loading to achieve the purpose of improving its cycle stability and rate performance

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