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Self-Templated Formation of Fluffy Graphene-Wrapped Ni5P4 Hollow Spheres for Li-Ion Battery Anodes with High Cycling Stability

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journal contribution
posted on 14.05.2021, 15:06 by Chunfei Zhang, Gisang Park, Byong-June Lee, Lan Xia, He Miao, Jinliang Yuan, Jong-Sung Yu
Transition-metal phosphides have gained great importance in the field of energy conversion and storage such as electrochemical water splitting, fuel cells, and Li-ion batteries. In this study, a rationally designed novel fluffy graphene (FG)-wrapped monophasic Ni5P4 (Ni5P4@FG) is in-situ-synthesized using a chemical vapor deposition method as a Li-ion battery anode material. The porous and hollow structure of Ni5P4 core is greatly helpful for lithium-ion diffusion, and at the same time, the cilia-like graphene nanosheet shell provides an electron-conducting layer and stabilizes the solid electrolyte interface formed on the Ni5P4 surface. The Ni5P4@FG sample shows a high reversible capacity of 739 mAh g–1 after 300 cycles at a specific current density of 500 mA g–1. The high capacity, superior cycling stability, and improved rate capability of Ni5P4@FG are ascribed to its unique hierarchical structure. Moreover, the present efficient fabrication methodology of Ni5P4@FG has potential to be developed as a general method for the synthesis of other transition-metal phosphides.