Journal of Energy Chemistry ›› 2023, Vol. 79 ›› Issue (4): 192-200.DOI: 10.1016/j.jechem.2022.12.025

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

Peilin Zhanga,b, Chen Huanga, Mingzhen Xiuc, Siyu Zhub, Weiwei Wanga, Bo Zhua, Likang Qina, Yizhong Huangb,*, Luyang Chena,*   

  1. aKey Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;
    bSchool of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore;
    cEnergy Research Institute, Interdisciplinary Graduate Programme, Nanyang Technological University, Singapore
  • Received:2022-10-10 Revised:2022-12-18 Accepted:2022-12-22 Online:2023-04-15 Published:2023-05-30
  • Contact: * E-mail addresses: yzhuang@ntu.edu.sg (Y. Huang), chenly@ecust.edu.cn (L. Chen).

Abstract: Non-graphitized carbon (NGC) has been extensively utilized as carbonaceous anode in sodium-ion bat-teries (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 potential-plateau 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.

Key words: Non-graphitized carbon, Highly disordered microstructure, Heteroatom dopant, Adsorption, Redox reaction