3 years ago

Core–Shell Aluminum@Carbon Nanospheres for Dual-Ion Batteries with Excellent Cycling Performance under High Rates

Core–Shell Aluminum@Carbon Nanospheres for Dual-Ion Batteries with Excellent Cycling Performance under High Rates
Lin Gu, Xinyu Liu, Yongbing Tang, Guanghai Chen, Fan Zhang, Xuefeng Tong
Dual-ion battery (DIB) has been proposed as a novel energy storage device with the merits of high safety, low cost and environmental friendliness. Herein, we have developed core/shell aluminum@carbon nanospheres (nAl@C) as anode material for DIB. The nanoscale framework is composed of an Al nanosphere and an amorphous carbon outer layer that is conductive and protective, facilitating the formation of a stable SEI film during cycling. Owing to the core-shell structural design, the nAl@C nanospheres demonstrate significantly enhanced electrochemical performance in a nAl@C-graphite DIB. The DIB exhibites high rate performance as well as superior cycling stability with a capacity of 88 mA h g-1 with 94.6% capacity retention and high Coulombic efficiency (> 99.5%) after 1000 cycles at a high current rate of 15 C. In addition, the nAl@C-G DIB deliveres an ultrahigh specific energy of 148 W h kg-1 at a high power density of 3701 W kg-1, which is much better than most commercial lithium-ion batteries. Nanoaluminum@carbon (nAl@C) core–shell nanospheres are developed as a new anode material for dual-ion batteries (DIBs). The DIB exhibits a high rate capability and superior cycling stability with 94.6% capacity retention after 1000 cycles at 15 C, which also achieves a high specific energy of 148 W h kg–1 at 3701 W kg–1, better than most conventional lithium-ion batteries.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201701967

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