Multi-channel FeP@C octahedra anchored on reduced graphene oxide nanosheet with efficient performance for lithium-ion batteries

Iron phosphide (FeP) is a promising anode material for Li-ion batteries (LIBs) due to its low cost and high theoretical capacity. To design FeP anode materials with multi-channels for both ions and electrons will greatly help to realize fast ion and electron diffusion and high-rate capability of LIB...

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Bibliographic Details
Published in:Carbon (New York) 2018-11, Vol.139, p.477-485
Main Authors: Zhu, Peipei, Zhang, Ze, Hao, Shiji, Zhang, Bowei, Zhao, Pengfei, Yu, Ji, Cai, Jianxin, Huang, Yizhong, Yang, Zhenyu
Format: Article
Language:English
Subjects:
Anodes
Batteries
Carbonization
Channels
Decay rate
Diffusion rate
Electrochemical analysis
Electrode materials
Electron diffusion
Electron transfer
Graphene
Graphite
Ions
Iron
Iron phosphide
Lithium ion batteries
Low conductivity
Multi-ion-and-electron-channel
N/P co-doping
Nanoparticles
Nanosheets
Octahedral framework
Phosphating (coating)
Phosphides
Rechargeable batteries
rGO
Semiconductor doping
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Summary:Iron phosphide (FeP) is a promising anode material for Li-ion batteries (LIBs) due to its low cost and high theoretical capacity. To design FeP anode materials with multi-channels for both ions and electrons will greatly help to realize fast ion and electron diffusion and high-rate capability of LIBs, and effectively overcome its intrinsic shortcomings of low conductivity and large volume expansion. Herein, a novel octahedral multi-channel FeP@C/rGO composite has been fabricated by a simple solvothermal process followed by carbonization and phosphorization. The as-prepared FeP@C/rGO composite displays an excellent rate capacity (497 mAh g−1 at 5 A g−1), as well as a high reversible capacity (1080 mAh g−1 at 0.1 A g−1) and superior cyclability with a capacity decay rate of 0.04% per cycle upon 500 cycles. The outstanding electrochemical performance of FeP@C/rGO composite can be attributed to the unique stable carbon octahedral multi-channel frameworks and N/P co-doping interconnect graphene conductive network, which significantly facilitate the Li-ion and electron transfer and accommodate the large volume change during cycling. This work shows a feasible strategy to fabricate FeP-based composites with multi-channels structure as a high-performance anode for lithium-ion batteries. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2018.07.029