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题名: Air-stable and freestanding lithium alloy/graphene foil as an alternative to lithium metal anodes
作者: Zhao, Jie;  Zhou, Guangmin;  Yan, Kai;  Xie, Jin;  Li, Yuzhang;  Liao, Lei;  Jin, Yang;  Liu, Kai;  Hsu, Po-Chun;  Wang, Jiangyan;  Cheng, Hui-Ming;  Cui, Yi
发表日期: 2017-10-1
摘要: Developing high-capacity anodes is a must to improve the energy density of lithium batteries for electric vehicle applications. Alloy anodes are one promising option, but without pre-stored lithium, the overall energy density is limited by the low-capacity lithium metal oxide cathodes. Recently, lithium metal has been revived as a high-capacity anode, but faces several challenges owing to its high reactivity and uncontrolled dendrite growth. Here, we show a series of Li-containing foils inheriting the desirable properties of alloy anodes and pure metal anodes. They consist of densely packed LixM (M= Si, Sn, or Al) nanoparticles encapsulated by large graphene sheets. With the protection of graphene sheets, the large and freestanding LixM/graphene foils are stable in different air conditions. With fully expanded LixSi confined in the highly conductive and chemically stable graphene matrix, this LixSi/graphene foil maintains a stable structure and cyclability in half cells (400 cycles with 98% capacity retention). This foil is also paired with high-capacity Li-free V2O5 and sulfur cathodes to achieve stable full-cell cycling.
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Recommended Citation:
Zhao, Jie,Zhou, Guangmin,Yan, Kai,et al. Air-stable And Freestanding Lithium Alloy/graphene Foil As An Alternative To Lithium Metal Anodes[J]. Nature Publishing Group,2017,12(10):993-999.

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