Hierarchical Co2P microspheres assembled from nanorods grown on reduced graphene oxide as anode material for Lithium-ion batteries

Chi Zhang, Guanghua Jiao, Fanjun Kong, Jian Wang, Shi Tao, Lei Zhang, Bin Qian, Yimin Chao

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Abstract

Transition metal phosphides (TMPs) have been studied as promising electrodes for energy storage and conversion due to their large theoretical capacities and high activities. Herein, a hierarchically structured Co2P coupling with the reduced graphene oxide (RGO) composite (Co2P/RGO) was synthesized by a simple solid state method for Li storage. The Co2P/RGO hybrid composite exhibits a high reversible capacity of 61 mAh g−1 at 60 mA g−1, good rate capability of 327 mAh g−1 at 3000 mA g−1 and long cycle life (397 mAh g−1 at 500 mA g−1 for after 1000 cycles). The excellent electrochemical performance can be attributed to the synergistic effect of Co2P micro/nano architecture and graphene modulation, which provide more activity sites for Li+-ions and maintain the structural integrity of active material. This work may provide a new path for preparation of other metal phosphides as potential electrode materials for application in energy storage fields.
Original languageEnglish
Pages (from-to)665-671
Number of pages7
JournalApplied Surface Science
Volume459
Early online date6 Aug 2018
DOIs
Publication statusPublished - 30 Nov 2018

Keywords

  • Cobalt phosphide
  • Graphene
  • Hierarchical structure
  • Anode
  • Lithium-ion batteries

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