Understanding the improved performance of sulfur‐doped interconnected carbon microspheres for Na‐ion storage

Carbon Energy

Botian Liu¹  Siming Chen²  Xibo Li²  Junpeng Xie²  Wenjie Mai²  Jinliang Li²  Xinran Yuan²  Genghua Yan²  Rui Li³  Likun Pan⁴ 

[1] Department of Chemistry and Biological Engineering Guilin University of Technology Guilin China;Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China;School of Advanced Materials, Shenzhen Graduate School, Peking University Shenzhen Guangdong China;Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science East China Normal University Shanghai China;

关键词: electrochemical enhancement mechanism;    electrochemical reaction;    Na‐ion batteries;    sulfur‐doped interconnected carbon microspheres;   

DOI  :  10.1002/cey2.98

来源: DOAJ

【 摘 要 】

Abstract As one of the low‐cost energy storage systems, Na‐ion batteries (NIBs) have received tremendous attention. However, the performance of current anode materials still cannot meet the requirements of NIBs. In our work, we obtain sulfur‐doped interconnected carbon microspheres (S‐CSs) via a simple hydrothermal method and subsequent sulfurizing treatment. Our S‐CSs exhibit an ultrahigh reversible capacity of 520 mAh g–1 at 100 mA g–1 after 50 cycles and an excellent rate capability of 257 mAh g–1, even at a high current density of 2 A g–1. The density functional theory calculations demonstrate that sulfur doping in carbon favors the adsorption of Na atom during the sodiation process, which is accountable for the performance enhancement. Furthermore, we also utilize operando Raman spectroscopy to analyze the electrochemical reaction of our S‐CSs, which further highlights the sulfur doping in improving Na‐ion storage performance.

【 授权许可】

Unknown