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Core–Shell Aluminum@Carbon Nanospheres for Dual‐Ion Batteries with Excellent Cycling Performance under High Rates
Author(s) -
Tong Xuefeng,
Zhang Fan,
Chen Guanghai,
Liu Xinyu,
Gu Lin,
Tang Yongbing
Publication year - 2018
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.201701967
Subject(s) - materials science , faraday efficiency , anode , carbon fibers , cycling , electrochemistry , chemical engineering , amorphous carbon , battery (electricity) , graphite , lithium (medication) , amorphous solid , nanotechnology , ion , energy storage , electrode , composite material , power (physics) , composite number , organic chemistry , physics , archaeology , quantum mechanics , history , engineering , medicine , chemistry , endocrinology
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.