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Hierarchical Microcables Constructed by CoP@C⊂Carbon Framework Intertwined with Carbon Nanotubes for Efficient Lithium Storage
Author(s) -
Guo Kangkang,
Xi Baojuan,
Wei Ruchao,
Li Haibo,
Feng Jinkui,
Xiong Shenglin
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902913
Subject(s) - materials science , anode , carbon nanotube , nanotechnology , electrolyte , lithium (medication) , carbon fibers , nanoparticle , electrical conductor , chemical engineering , electrode , composite material , composite number , medicine , chemistry , endocrinology , engineering
Transition‐metal phosphides (TMPs)‐based electrode materials with high capacity have attracted considerable interest as a promising anode material for lithium−ion batteries (LIBs). Herein, a hierarchical cable‐like structure composed of CoP@C core−shell nanoparticles (NPs) encapsulated in one‐dimensional (1D) porous carbon framework intertwined with N‐doped carbon nanotubes (CoP@C⊂PCF/NCNTs) is synthesized by a self‐templating, self‐catalytic, and subsequent vapor‐phase phosphorization strategy. The unique nanoarchitecture regime provides multiple advantages. The 1D carbon framework allows for quick ion and electron access, maintaining the integrity and accommodating the volume change of the structure during repeated discharging/charging. The internal carbon shell can prevent the direct aggregation of CoP NPs on cycling. The external NCNTs on the surface supply a staggered conductive network to promote electrolyte penetration and charge transportation. Impressively, the as‐fabricated hybrid nanocables deliver a reversible capacity of 712 mAh g −1 at 0.5 A g −1 for over 700 cycles with excellent rate capability as an anode material for LIBs. The significantly improved lithium storage properties of CoP@C⊂PCF/NCNTs reveal the importance of reasonable design and engineering of novel hierarchical structures with higher complexity.