Antimony trisulfide nanodot/sulfur-doped carbon composite material, preparation method thereof and application of antimony trisulfide nanodot/sulfur-doped carbon composite material to sodium/potassium ion battery

Abstract

The invention discloses an antimony trisulfide nanodot / sulfur-doped carbon composite material, a preparation method thereof and application of the antimony trisulfide nanodot / sulfur-doped carbon composite material to a sodium / potassium ion battery. Sb2S3 nanodots are uniformly distributed in pores and on the surface of sulfur-doped carbon, so that the composite material can be formed. According tothe preparation method, an organic antimony salt is placed in a reducing atmosphere so as to be subjected to reduction treatment, so that an antimony nanodot / carbon composite material can be obtained; the antimony nanodot / carbon composite material and a sulfur source are arranged in a protective atmosphere so as to undergo a solid-phase reaction, so that the antimony trisulfide nanodot / sulfur-doped carbon composite material can be formed. The Sb2S3 of the composite material is a nano point material; the nano point material has a unique volume effect, a surface effect, a quantum size effect, amacroscopic quantum tunnel effect and the like and can effectively enhance the electrochemical properties of the composite material; the sulfur-doped carbon carrier can enhance the conductivity of the composite material and can relieve the large volume expansion of the antimony trisulfide material in a charging / discharging process. The antimony trisulfide nanodot / sulfur-doped carbon composite material presents characteristics such as high capacity and favorable cycle stability when being used for sodium-ion and potassium-ion batteries.

Description

technical field [0001] The invention relates to a negative electrode material for a sodium / potassium ion battery, in particular to a Sb 2 S 3 The nano-dot / sulfur-doped carbon composite material also relates to its preparation method and its application as a negative electrode material for sodium-ion or potassium-ion batteries, belonging to the fields of new energy storage materials and electrochemistry. Background technique [0002] The need for green energy conversion and storage in various applications such as portable electronic devices, electric vehicles, and large-scale power stations drives the exploration of advanced energy storage technologies. A variety of energy storage devices have been designed and studied for different energy storage requirements. Among them, lithium-ion batteries have penetrated into many aspects of daily life since their commercialization in the 1990s due to their advantages such as high specific capacity, long cycle life, high working volta...

AI Technical Summary

Problems solved by technology

[0003] The metal sulfide nanomaterial antimony trisulfide has high capacity characteristics and has attracted widespread attention in recent years. Studies have shown that antimony trisulfide can exhibit excellent performance in lithium-ion batteries and sodium-ion batteries, but the research on its potassium ion performance still in the preliminary stages of exploration

The performance results of lithium-ion and sodium-ion batteries of antimony trisulfide show that there is a large volume expansion of antimony trisulfide materials during charge and discharge, and the cycle stability of the materials is generally insufficient.

Aiming at the serious volume expansion problem of antimony trisulfide material in bulk phase transformation reaction and alloying reaction

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