1. Heterostructured CoS2/CuCo2S4@N-doped carbon hollow sphere for potassium-ion batteries
- Author
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Zhang Li, Jiaqi Zhang, Ye Xiaohui, Xiaojiang Hou, Feng Lei, Qiyao Yu, Suo Guoquan, Yang Yanling, Yan Cheng, Zongyou Li, and Syed Musab Ahmed
- Subjects
Materials science ,Nanostructure ,Diffusion ,chemistry.chemical_element ,Heterojunction ,Electrolyte ,Conductivity ,Energy storage ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Anode ,Biomaterials ,Colloid and Surface Chemistry ,Chemical engineering ,chemistry ,Carbon - Abstract
Potassium ions batteries (PIBs) have been regarded as a promising choice for electrical energy storage technology due to the wide distribution of potassium resources. However, developing low-cost and robust earth-rich anode materials is still a major challenge for the practical and scalable usage of PIBs. Herein, for the first time, we developed nitrogen doped carbon coating CoS2/CuCo2S4 heterostructure (CoS2/CuCo2S4@NCs) hollow spheres and evaluated as anode for PIBs. The CoS2 and CuCo2S4 heterostructure interface could generate a built-in electric field, which can fasten electrons transportation. The nanostructures could shorten the diffusion length of K+ and provide large surface area to contact with electrolytes. Furthermore, the inner hollow sphere morphology along with the carbon layer could accommodate the volume expansion during cycling. What’s more, the N-doped carbon could increase the conductivity of the anodes. Benefitting from the above features, the CoS2/CuCo2S4@NCs displays an outstanding rate capability (309 mAh g−1 at 500 mA g−1 after 250 cycles) and a long-term cycling life (112 mAh g−1 at 1000 mA g−1 after 1000 cycles) in ether-based electrolyte. Conversion reaction mechanism in CoS2/CuCo2S4@NCs anode is also revealed through ex situ XRD characterizations. This work provides a practical direction for investigating metal sulfides as anode for PIBs.
- Published
- 2022