Solid electrolyte interphases for high-energy aqueous aluminum electrochemical cells
Solid electrolyte interphases for high-energy aqueous aluminum electrochemical cells
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DOI：
10.1126/sciadv.aau8131
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发表时间：
2018-11
期刊：
影响因子：
13.6
通讯作者：
Qing Zhao;M. Zachman;Wajdi I Al Sadat;Jing Zheng;L. Kourkoutis;L. Archer
中科院分区：
文献类型：
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作者：
Qing Zhao;M. Zachman;Wajdi I Al Sadat;Jing Zheng;L. Kourkoutis;L. Archer
铝上的人工固体电解质界面使水溶液电池具有高比能量和良好的可逆性。基于铝（Al）的电化学电池受到长期关注，因为Al是地球上丰富的、低成本的和化学惰性的。三价Al 3+离子还提供最高的体积比电荷存储容量（8040 mAh cm-3），比Li金属阳极可实现的容量大大约四倍。迄今为止，在Al上快速且不可逆地形成高电气带隙钝化Al 2 O3氧化物膜已经挫败了所有创造具有高可逆性的水性Al基电化学电池的努力。在这里，我们研究了金属铝上形成的界面与离子液体（IL）-共晶电解质接触，并发现人工固体电解质界面（ASEI）上自发形成的金属永久转换其界面化学。所得IL-ASEI进一步显示使水性Al电化学电池具有前所未有的可逆性。为了说明这些界面的潜在好处，我们创建了简单的Al|| MnO 2水溶液电池，并报告说，它们提供高比能（约500 Wh/kg，基于阴极中的MnO 2质量）和应用所需的固有安全特性。
An artificial solid electrolyte interphase on aluminum enables aqueous batteries with high specific energy and good reversibility. Electrochemical cells based on aluminum (Al) are of long-standing interest because Al is earth abundant, low cost, and chemically inert. The trivalent Al3+ ions also offer among the highest volume-specific charge storage capacities (8040 mAh cm−3), approximately four times larger than achievable for Li metal anodes. Rapid and irreversible formation of a high-electrical bandgap passivating Al2O3 oxide film on Al have, to date, frustrated all efforts to create aqueous Al-based electrochemical cells with high reversibility. Here, we investigate the interphases formed on metallic Al in contact with ionic liquid (IL)–eutectic electrolytes and find that artificial solid electrolyte interphases (ASEIs) formed spontaneously on the metal permanently transform its interfacial chemistry. The resultant IL-ASEIs are further shown to enable aqueous Al electrochemical cells with unprecedented reversibility. As an illustration of the potential benefits of these interphases, we create simple Al||MnO2 aqueous cells and report that they provide high specific energy (approximately 500 Wh/kg, based on MnO2 mass in the cathode) and intrinsic safety features required for applications.