Highly active CoP-CO_(2)N confined in nanocarbon enabling efficient electrocatalytic immobilizing-conversion of polysulfide targeting high-rate lithium-sulfur batteries

作     者：Xiaojun Zhao Tianqi Gao Wenhao Ren Chuan Zhao Zhi-Hong Liu Linbo Li Xiaojun Zhao;Tianqi Gao;Wenhao Ren;Chuan Zhao;Zhi-Hong Liu;Linbo Li

作者机构：School of Metallurgical EngineeringXi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an 710062ShaanxiChina School of ChemistryUniversity of New South WalesSydneyNSW 2052Australia 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第75卷第12期

页      面：250-259,I0006页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：supported by the National Natural Science Foundation of China(21903051 and 22073061)) the award of Future Fellowship from the Australian Research Council(FT170100224) 

主　　题：CoP-CO_(2)N@NC/CG Trapping-diffusion-conversion High-rate DFT calculation Li-S battery 

摘      要：Lithium-sulfur batteries suffer from poor cycling stability because of the intrinsic shuttling effect of intermediate polysulfides and sluggish reaction kinetics,especially at high rates and high sulfur ***,we report the construction of a CoP-CO_(2)N@N-doped carbon polyhedron uniformly anchored on three-dimensional carbon nanotubes/graphene(CoP-CO_(2)N@NC/CG)scaffold as a sulfur reservoir to achieve the trapping-diffusion-conversion of *** active CoP-CO_(2)N shows marvelous catalytic effects by effectively accelerating the reduction of sulfur and the oxidation of Li_(2)S during the discharging and charging process,respectively,while the conductive NC/CG network with massive mesoporous channels ensures fast and continuous long-distance electron/ion *** calculations demonstrate that the CoP-CO_(2)N with excellent intrinsic conductivity serves as job-synergistic immobilizing-conversion sites for polysulfides through the formation of P…Li/N…Li and Co…S *** a result,the S@CoP-CO_(2)N@NC/CG cathode(sulfur content 1.7 mg cm^(-2))exhibits a high capacity of988 mAh g^(-1)at 2 C after 500 cycles,which is superior to most of the electrochemical performance *** under high sulfur content(4.3 mg cm^(-2)),it also shows excellent cyclability with high capacity at 1 C.