Flexible Amalgam Film Enables Stable Lithium Metal Anodes with High Capacities
Flexible Amalgam Film Enables Stable Lithium Metal Anodes with High Capacities
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柔性汞合金薄膜可实现稳定的高容量锂金属阳极
DOI：
10.1002/anie.201911800
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发表时间：
2019-11-06
影响因子：
16.6
通讯作者：
Ding, Yi
中科院分区：
文献类型：
--
作者：
He, Guang;Li, Qingwen;Ding, Yi
枝晶的形成是锂（Li）金属阳极应用的关键挑战。在这项工作中，一个新的战略，证明了解决这个问题，通过制造锂汞合金薄膜在其表面上。该保护膜用作提供重复Li镀覆/剥离的柔性缓冲层。在对称电池中，受保护的Li电极在8 mA cm（-2）和8 mAh cm（-2）的高电镀电流和容量下分别表现出超过750小时的稳定循环。再加上高负载阴极（约。12 mg cm（-2）），如LiFePO 4和LiNi0.6Co0.2Mn0.2O2，被保护的混合阳极表现出显著改善的电池稳定性，表明其对于Li金属电池的实际开发的可靠性。界面分析揭示了一个独特的电镀合金化的协同功能的保护膜，在膜下的Li是积极参与电极反应循环。锂汞齐丰富了合金阳极家族，为无枝晶阳极的合理设计提供了新的视角。
Dendrite formation is a critical challenge for the applications of lithium (Li) metal anodes. In this work a new strategy is demonstrated to address this issue by fabricating an Li amalgam film on its surface. This protective film serves as a flexible buffer that affords repeated Li plating/stripping. In symmetric cells, the protected Li electrodes exhibit stable cycling over 750 hours at a high plating current and capacity of 8 mA cm(-2) and 8 mAh cm(-2), respectively. Coupled with high-loading cathodes (ca. 12 mg cm(-2)) such as LiFePO4 and LiNi0.6Co0.2Mn0.2O2, the protected hybrid anodes demonstrate significantly improved cell stability, indicating its reliability for practical development of Li metal batteries. Interfacial analyses reveal a unique plating-alloying synergistic function of the protective film, where Li beneath the film is actively involved in the electrode reactions upon cycling. Lithium amalgams enrich the alloy anode family and provide new perspectives for the rational design of dendrite-free anodes.