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CSCD
Potassium-ion batteries (PIBs) are of academic and economic significance, but still limited by the lack of highly active electrode materials for de-/intercalation of large-radius K ions. Herein, an interconnected nitrogen/sulfur co-doped carbon nanosheep bundle (N/S-CSB) was proposed as the potassium ions storage material. The rich co-doping of nitrogen/sulfur of N/S-CNB with three-dimensional hierarchical bundled array structure yields distensible interlayer spaces to buffer the volume expansion during K+ insertion/extraction, offers more electrochemical active sites to obtain a high specific capacity, and provides efficient channels for fast ion/electron transports. Therefore, the N/S-CSB anode achieved high reversible specific capacity of 365 mAh/g obtained at 50 mA/g after 200 cycles with a coulombic efficiency (CE) close to 100%, high rate performance and long cycle stability. Moreover, the in-situ Raman spectra indicated outstanding reaction kinetics of as-prepared N/S-CSB anode.
Jian Zhu acknowledges support by the National Natural Science Foundation of China (Nos. 52074113 and 22005091), the Fundamental Research Funds of the Central Universities (No. 531107051048). Xidong Duan acknowledges support by the National Natural Science Foundation of China (No. 51872086), and the Hunan Key Laboratory of Two-Dimensional Materials (No. 2018TP1010) and the Innovative Research Groups of Hunan Province (No. 2020JJ1001)