期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 5, 页码 5373-5379出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19613
关键词
cobalt phosphide; graphene aerogel; template-engaged; stability; lithium-ion battery
资金
- Australian Research Council (ARC) [DP170102406, FT150100109]
- ARC CoE Scheme [CE140100012]
An ingeniously designed porous structure can synergistically optimize the desired properties and maximize the advantages of a material as an electrode for a high-performance energy storage system. The active material with a porous nanostructure could reduce the ion diffusion path and buffer the strain caused by the volume changes during cycling. Furthermore, combining the active material with a three-dimensional (3D) graphene aerogel (GA) matrix is an ideal way to maintain the structural integrity, improve the conductivity, and overcome the aggregation problem of the nanomaterials. Herein, we adopted a facile template-based strategy to derive a composite of 3D hierarchically porous cobalt phosphide nanocubes with a graphene aerogel (CoP@GA). The as-prepared CoP@GA features porous cobalt phosphide nanocubes that are firmly encapsulated and uniformly distributed in the well-defined graphene aerogel skeleton. Benefiting from the hierarchical porosity, structural integrity, and conductive network, the CoP@GA electrode manifests an ultrahigh initial Coulombic efficiency (88.6%), outstanding lithium storage performance in terms of excellent cycling performance (805.3 mAh.g(-1) after 200 cycles at 200 mA.g(-1)), superior high-energy performance (351.8 mAh.g(-1) after 4000 cycles at 10 A.g(-1)), and exceptional rate capability. Moreover, this synthesis protocol could be an instructive precedent for fabricating transition-metal-phosphide-based 3D porous composites with excellent electrochemical performances.
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