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Cotton-derived oxygen/sulfur co-doped hard carbon as advanced anode material for potassium-ion batteries
Authors:Baolin Xu  Shihan Qi  Fang Li  Xiaoxin Peng  Jinfeng Cai  Jiaojiao Liang  Jianmin Ma
Affiliation:School of Physics and Electronics, Hunan University, Changsha 410082, China; Yiyang Wanjingyuan Electronics Co., Ltd., Yiyang 413000, China; College of Traffic Engineering, Hunan University of Technology, Zhuzhou 412008, China; Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou 450002, China; State Key Lab of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072 China
Abstract:
Hard carbon is regarded as promising anode materials for potassium-ion batteries (KIBs) owing to their low price and easy availability. However, the limited rate capability still needs to be improved. Herein, we demonstrate the fabrication of oxygen/sulfur co-doped hard carbon through a facile hydrolyzationsulfuration process of skimmed cotton. The simultaneous dopants significantly improve potassium ion diffusion rate. When served as the anode for KIBs, this hydrolyzed hard carbon delivered a high reversible capacity (409 mAh/g at 0.1 A/g), superior rate capability (135 mAh/g at 2 A/g) and excellent cyclability (about 120 mAh/g overt 500 cycles at 2 A/g). This work provides a facile strategy to prepare low-cost doped-hard carbon with superior potassium storage property.
Keywords:Carbon  Doping  Anode  Potassium-ion battery  Biomass  
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