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Carbon nanotube-stabilized Co₉S₈ dual-shell hollow spheres for high-performance K-ion storage
- Zhou, Jie, Zhao, Haoyu, Zhang, Qianliang, Li, Tieqiang, Li, Yang, Lin, Ning, Qian, Yitai
- Chemical communications 2019 v.55 no.10 pp. 1406-1409
- anodes, batteries, carbon, carbon nanotubes, chemical communication, chemical compounds, chemical reactions, electrochemistry, reaction mechanisms
- In this work, carbon nanotube-coated dual-shell Co₉S₈ hollow spheres are studied as anode materials for K-ion batteries. The unique hollow structure and carbon nanotubes synergistically enhance the conductivity and resolve the critical drawbacks of Co₉S₈ electrodes, including large volume variation, structural instability and interfacial changes. Thus, the electrode delivers a stable reversible capacity of 320.5 mA h g⁻¹ at 0.1 A g⁻¹ after 200 cycles with a capacity retention of 91%. At 1.0 A g⁻¹, the capacity is 163.9 mA h g⁻¹ after 1000 cycles with a capacity retention of 73.6%. An investigation of the electrode reaction mechanism indicates that the surface capacity also contributes to the outstanding electrochemical performance.