Affiliation:
1. Advanced Energy Storage Technology Research Center Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China
2. Department of Chemistry and Biological Engineering Guilin University of Technology Guilin 541004 China
3. Nano Science and Technology Institute University of Science and Technology of China Suzhou 215123 China
4. School of Materials Science and Optoelectronic Technology University of Chinese Academy of Sciences Beijing 100049 China
Abstract
AbstractHeteroatom doping in carbon‐based anode materials is crucial to improve their capacity and promoting the practical application of low‐cost potassium‐ion batteries (KIBs). Herein, the selenium/nitrogen co‐doped amorphous carbon nanocluster (SeN‐ACN) anodes exhibit an ultra‐high reversible capacity of 621 mAh g−1 at 0.75 C (225 mA g−1) and a capacity retention of 93% after 2000 cycles at 5 C, which represent a remarkable achievement in potassium storage in nonmetallic doped carbon materials. This is attributed to the synergistic effects of Se/N co‐doping and their anchoring effects on potassium ions. As a proof of concept, a potassium‐based dual‐ion battery (K‐DIB), which consists of a SeN‐ACN anode and low‐cost graphite cathode, demonstrates a high reversible capacity of 118 mAh g−1 at 150 mA g−1 with a high cut‐off voltage of 5.2 V. Moreover, it presents excellent long‐term cycling performance, with 70% capacity retention after 500 cycles, among the best reported results of K‐DIBs.
Funder
National Key Research and Development Program of China
Natural Science Foundation of Guangdong Province
National Natural Science Foundation of China
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials