Heteroatom dopant strategy triggered high-potential plateau to non-graphitized carbon with highly disordered microstructure for high-performance sodium ion storage

作     者：Peilin Zhang Chen Huang Mingzhen Xiu Siyu Zhu Weiwei Wang Bo Zhu Likang Qin Yizhong Huang Luyang Chen Peilin Zhang;Chen Huang;Mingzhen Xiu;Siyu Zhu;Weiwei Wang;Bo Zhu;Likang Qin;Yizhong Huang;Luyang Chen

作者机构：Key Laboratory for Ultrafine Materials of Ministry of EducationSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China School of Materials Science and EngineeringNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Energy Research InstituteInterdisciplinary Graduate ProgrammeNanyang Technological UniversitySingapore 

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

年 卷 期：2023年第79卷第4期

页      面：192-200页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 0823[工学-交通运输工程] 

基　　金：supported by the National Natural Science Foundation of China(52272296,51502092) the Fundamental Research Funds for the Central Universities(JKD01211601,1222201718002) the National Overseas High-Level Talent Youth Program in China the Eastern Scholar Project of Shanghai。 

主　　题：Non-graphitized carbon Highly disordered microstructure Heteroatom dopant Adsorption Redox reaction 

摘      要：Non-graphitized carbon(NGC)has been extensively utilized as carbonaceous anode in sodium-ion batteries(SIBs).However,more optimization to achieve competitive capacity and stability is still challenging for SIBs.In the study,the dopant strategy is utilized to construct nitrogen/sulfur-doped non-graphitized carbon(N-NGC or S-NGC)shell decorated on three-dimensional graphene foam(GF)as a self-support electrode.The highly disordered microstructures of heteroatom doped carbons are produced by applying a low-temperature pyrolysis treatment to precursors containing nitrogen and sulfur.The DFT calculations of Na-ion adsorption energies at diverse heteroatom sites show marginal-S,pyrrolic N and pyridinic N with more intensive Na-ion adsorption ability than middle-S,C=O and pristine carbon.The N-NGC with dominant small graphitic regions delivers adsorption ability to Na-ion,while the S-NGC with significant single carbon lattice stripes demonstrates redox reaction with Na-ion.Evidently,in comparison with only adsorption-driven slope regions at high potential for N-NGC,the redox reaction-generated potentialplateau enables non-graphitized S-NGC superior discharge/charge capacity and cycle-stability in the slope region.This work could provide deep insight into the rational design of non-graphitized carbon with rich microstructure and composition.