Dual-defect engineering of catalytic cathode materials for advanced lithium-sulfur batteries  

作　　者：Na Li Wenxue Wang Peng Wang Zhanying Sun Xinlong Tian Xiaodong Shi 

机构地区：[1]Hebei Key Laboratory of Flexible Functional Materials,School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China [2]School of Marine Science and Engineering,State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,China

出　　处：《Chinese Chemical Letters》2025年第3期476-482,共7页中国化学快报(英文版)

基　　金：financial support from National Natural Science Foundation of China(No.52101250);Hebei Provincial Natural Science Foundation(Nos.E2021208031 and B2021208069);S&T program of Hebei(Nos.215A4401D and 225A4404D);Research Fund of the Innovation Platform for Academicians of Hainan Province(No.YSPTZX202315);Collaborative Innovation Center of Marine Science and Technology of Hainan University(No.XTCX2022HYC14);partially supported by the Pico Election Microscopy Center of Hainan University;Fundamental Research Funds for the Hebei University(No.2021YWF11);Science Research Project of Hebei Education Department(No.QN2024087);Xingtai City Natural Science Foundation(No.2023ZZ027)

摘　　要：Sluggish conversion reaction kinetics and spontaneous shuttle effect of lithium polysulfides(LiPSs)are deemed as the two big mountains that hinder the practical application of lithium-sulfur batteries(LSBs).Herein,dual-defect engineering strategy is implemented by introducing boron-doping and phosphorusvacancy sites with MoP@NC composite as the precursor.Based on the experimental characterizations and theoretical calculations,B-MoP_(1-x)@NC-based electrode presents low oxidation potential,high lithium diffusivity,small Tafel slope and strong adsorption capability for polysulfides,which is beneficial to enhance the adsorption capability for LiPSs,reduce the lithium diffusion energy barriers and Gibbs free energy for the conversion reactions of LiPSs.As demonstrated,the corresponding Li-S/B-MoP1-x@NC batteries can remain high reversible capacity of 753 mAh/g at 0.5 C after 300 cycles,and keep a stable capacity of 520 mAh/g at 0.5 C after 100 cycles even at the high-loading content of 5.1mg/cm^(2).According to the results of in-situ UV–vis spectra,the satisfactory battery performance majorly originates from the existence of dual-defect characteristics in B-MoP1-x@NC catalyst,which effectively promotes the conversion reaction kinetics of LiPSs,and restrains the shuttle behavior of LiPSs.The key ideas of this work will enlighten the development of catalytic cathode materials for sulfur-based secondary batteries.

关 键 词：Dual-defect engineering Boron doping Phosphorus vacancy Catalytic cathode materials Lithium-sulfur batteries 

分 类 号：TM912[电气工程—电力电子与电力传动]