Growth of hierarchical 3D mesoporous NiSix /NiCo2 O4 core/shell heterostructures on nickel foam for lithium-ion batteries.
We demonstrate the facile and well-controlled design and fabrication of heterostructured and hierarchical 3D mesoporous NiSix /NiCo2 O4 core/shell nanowire arrays on nickel foam through a facile chemical vapor deposition (CVD) technique combined with a simple but powerful chemical bath deposition (CBD) technique. The smart hybridization of NiCo2 O4 and NiSix nanostructures results in an intriguing mesoporous hierarchical core/shell nanowire-array architecture. The nanowire arrays demonstrate enhanced electrochemical performance as binder- and conductive-agent-free electrodes for lithium ion batteries (LIBs) with excellent capacity retention and high rate capability on cycling. The electrodes can maintain a high reversible capacity of 1693 mA h g(-1) after 50 cycles at 20 mA g(-1) . Given the outstanding performance and simple, efficient, cost-effective fabrication, we believe that these 3D NiSix /NiCo2 O4 core/shell heterostructured arrays have great potential application in high-performance LIBs.
Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong.
Qiaobao
Q
Zhang
Huixin
H
Chen
Jiexi
J
Wang
Daguo
D
Xu
Xinhai
X
Li
Yong
Y
Yang
Kaili
K
Zhang
D003035:Cobalt / Q000737:chemistry*; D011211:Electric Power Supplies; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry; D009532:Nickel / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D014835:Volatilization
D010087:Oxides; D003035:Cobalt; D012822:Silicon Dioxide; D009532:Nickel; D008094:Lithium
3d core/shell heterostructures; NiSix/NiCO2O4; anode materials; electrochemistry; lithium-ion batteries