法拉第效率
阳极
材料科学
阴极
储能
锂(药物)
电池(电)
电解质
电化学
枝晶(数学)
化学工程
比能量
镁
冶金
化学
电极
内分泌学
医学
功率(物理)
物理
几何学
数学
工程类
物理化学
量子力学
作者
Hyun Deog Yoo,Yanliang Liang,Yifei Li,Yan Yao
标识
DOI:10.1021/acsami.5b01206
摘要
Hybrid magnesium–lithium-ion batteries (MLIBs) featuring dendrite-free deposition of Mg anode and Li-intercalation cathode are safe alternatives to Li-ion batteries for large-scale energy storage. Here we report for the first time the excellent stability of a high areal capacity MLIB cell and dendrite-free deposition behavior of Mg under high current density (2 mA cm–2). The hybrid cell showed no capacity loss for 100 cycles with Coulombic efficiency as high as 99.9%, whereas the control cell with a Li-metal anode only retained 30% of its original capacity with Coulombic efficiency well below 90%. The use of TiS2 as a cathode enabled the highest specific capacity and one of the best rate performances among reported MLIBs. Postmortem analysis of the cycled cells revealed dendrite-free Mg deposition on a Mg anode surface, while mossy Li dendrites were observed covering the Li surface and penetrated into separators in the Li cell. The energy density of a MLIB could be further improved by developing electrolytes with higher salt concentration and wider electrochemical window, leading to new opportunities for its application in large-scale energy storage.
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