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.

中文翻译：

---

用于双离子电池的核壳铝@碳纳米球，在高倍率下具有出色的循环性能

双离子电池（DIB）已被提出作为一种新颖的储能设备，具有高安全性，低成本和环境友好的优点。在这里，我们已经开发了核/壳铝@碳纳米球（nAl @ C）作为DIB的阳极材料。纳米级框架由Al纳米球和无定形碳外层组成，该碳外层具有导电性和保护性，有助于在循环过程中形成稳定的SEI膜。由于核壳结构设计，nAl @ C纳米球在nAl @ C石墨DIB中显示出显着增强的电化学性能。DIB具有高倍率性能以及出色的循环稳定性，容量为88 mA hg ^-1与在15℃另外的高电流速率1000次循环后94.6％的容量保持率和高的库仑效率（> 99.5％）中，NAL @ C_-G DIB deliveres 148 W时公斤的超高比能量^-1以3701 W kg ^-1的高功率密度，这比大多数商用锂离子电池要好得多。