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Published on: February 5, 2019
Urchin-Type Architecture Assembled by Cobalt Phosphide Nanorods Encapsulated in Graphene Framework as an Advanced
Jiamei Wang1,2, Gang Zhu3, Zelei Zhang1,2
1State Key Laboratory of Photoelectric Technology and Functional Materials, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi'an, 710127, China.
Abstract:
Urchin-type cobalt phosphide microparticles assembled by nanorod were encapsulated in a graphene framework membrane (CoP@GF), and used as a binder-free electrode for alkali metal ion batteries. Electrochemical measurements indicate that this membrane exhibits enhanced reversible lithium, sodium, and potassium storage capabilities. Moreover, the energy storage properties of CoP@GF electrodes in alkali metal ion batteries display an order of Li>Na>K. DFT calculations on adsorption energy of CoP surfaces for Li, Na, and K indicated that CoP surfaces were more favorable to transfer electrons to Li atoms than Na and K, and the surface reactivity can be ordered as Li-CoP>Na-CoP>K-CoP; thus, CoP@GF exhibits better storage capacity for lithium. This work provides experimental and theoretical basis for understanding the electrochemical performance of cobalt phosphide-based membranes for alkali metal ion batteries.
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