P doped onion-like carbon layers coated FeP nanoparticles for anode materials in lithium ion batteries

By Zhang, Mingji; Yu, Jieyi; Ying, Tongpan; Yu, Jiahao; Sun, Yuping; Liu, Xianguo
Published in Journal of Alloys and Compounds 2019

Abstract

Except for low conductivity and huge volume expansion, FeP can be considered as a promising anode material for lithium ion batteries (LIBs). For overcoming these issues, P doped onion-like carbon layers coated FeP (FeP@(P, OLC)) nanoparticles have been one-pot prepared by arc discharging the Fe-P powers under the gas mixture of argon, hydrogen and ethanol, which have been designed for achieving excellent performance anode in LIBs. Being applied as anode material for LIBs, FeP@(P, OLC) core-shell structured nanoparticles deliver superior electrochemical performance by means of high initial coulombic efficiency (79.8%), stable cycle life (915 mA h g?1 at 0.1 A g?1 after 500 cycles) and excellent rate capability (averaged capacities of 379 and 237 mA h g?1 at 8.0 and 10.0 A g?1, respectively), which are ascribed to the synergistic effect of microstructure design and the composition optimization. P-doped OLC shells can alleviate the aggregation of FeP nanoparticles, offer the efficient channels for electrons and ions, and buffer the volumetric variety for FeP nanoparticles during the repetitive Li ion insertion/extraction process, avoiding partially the pulverization issue and improving cyclic stability. The facile synthesis strategy is expected to be helpful for designing and preparing transition metal phosphide nanoparticles coated by P doped OLC shell for energy storage applications.

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