Understanding the improved performance of sulfur‐doped interconnected carbon microspheres for Na‐ion storage
Xinran Yuan,
Siming Chen,
Jinliang Li,
Junpeng Xie,
Genghua Yan,
Botian Liu,
Xibo Li,
Rui Li,
Likun Pan,
Wenjie Mai
Affiliations
Xinran Yuan
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Siming Chen
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Jinliang Li
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Junpeng Xie
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Genghua Yan
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Botian Liu
Department of Chemistry and Biological Engineering Guilin University of Technology Guilin China
Xibo Li
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
Rui Li
School of Advanced Materials, Shenzhen Graduate School, Peking University Shenzhen Guangdong China
Likun Pan
Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Electronic Science East China Normal University Shanghai China
Wenjie Mai
Department of Physics, Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials Jinan University Guangzhou Guangdong China
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.
