广东工业大学学报2024，Vol.41Issue(3)：18-28,11.DOI:10.12052/gdutxb.230118
钒基硫化物-MXene异质催化剂的制备及锂硫电池催化机理对比研究
Preparation of Vanadium-based Sulfide-MXene Hetero-Catalysts and Comparative Study of Catalytic Mechanism of Lithium-sulfur Batteries
摘要
Abstract
Because of high theoretical specific capacity and energy density,lithium-sulfur batteries(LSBs)are regarded as one of the most promising energy storage batteries.However,the low conductivity of the active sulfur and the Li2S discharge product,the shuttle effect of intermediate products produced by the charging and discharging process,and serious capacity degradation caused by the slow sulfur redox kinetics,limits the practical application of LSB.Herein,three different vanadium sulfide@MXene hetero-structure catalysts were synthesized by one-step hydrothermal method and applied to the cathode host in LSBs.Compared with VS4@MXene and V5S8@MXene,VS2@MXene has the largest specific surface area and electrochemical active surface area,which provides more active sites in LSBs,thereby improving the electrochemical reaction kinetics.Meanwhile,the experimental and Density Functional Theory(DFT)theoretical calculation results show that the VS2@MXene has the strongest polysulfide adsorption ability and electronic conductivity,which effectively alleviates the shuttle effect of polysulfides and improves the utilization of sulfur.LSBs with S/VS2@MXene as the cathode achieve an initial discharge specific capacity of 815.4 mAh·g-1 and still maintain a reversible specific capacity of 645.4 mAh·g-1 after 400 cycles at 1 C.This research provides some insights for the selection of vanadium-based sulfide as the catalytic materials and hosts in lithium-sulfur batteries.关键词
锂硫电池/钒基硫化物/催化转化/异质结构Key words
lithium-sulfur batteries/vanadium-based sulfide/catalytic conversion/heterogeneous structure分类
通用工业技术引用本文复制引用
王心英,陈丽,张嘉城,玉耀江,王译,李运勇..钒基硫化物-MXene异质催化剂的制备及锂硫电池催化机理对比研究[J].广东工业大学学报,2024,41(3):18-28,11.基金项目
国家自然科学基金资助面上项目(51972066) （51972066）
广东省自然科学基金资助面上项目(2021A1515011718) （2021A1515011718）
