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 

机构地区：[1]Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China [2]School of Materials Science and Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,Singapore [3]Energy Research Institute,Interdisciplinary Graduate Programme,Nanyang Technological University,Singapore

出　　处：《Journal of Energy Chemistry》2023年第4期192-200,共9页能源化学（英文版）

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。

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.

关 键 词：Non-graphitized carbon Highly disordered microstructure Heteroatom dopant Adsorption Redox reaction 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]