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Free-standing ultrathin lithium metal–graphene oxide host foils with controllable thickness for lithium batteries
Nature Energy  (IF60.858),  Pub Date : 2021-05-20, DOI: 10.1038/s41560-021-00833-6
Hao Chen, Yufei Yang, David T. Boyle, You Kyeong Jeong, Rong Xu, Luize Scalco de Vasconcelos, Zhuojun Huang, Hansen Wang, Hongxia Wang, Wenxiao Huang, Huiqiao Li, Jiangyan Wang, Hanke Gu, Ryuhei Matsumoto, Kazunari Motohashi, Yuri Nakayama, Kejie Zhao, Yi Cui

Thin (≤20 μm) and free-standing Li metal foils would enable precise prelithiation of anode materials and high-energy-density Li batteries. Existing Li metal foils are too thick (typically 50 to 750 μm) or too mechanically fragile for these applications. Here, we developed a facile and scalable process for the synthesis of an ultrathin (0.5 to 20 μm), free-standing and mechanically robust Li metal foil within a graphene oxide host. In addition to low areal capacities of ~0.1 to 3.7 mAh cm−2, this Li foil also has a much-improved mechanical strength over conventional pure Li metal foil. Our Li foil can improve the initial Coulombic efficiency of graphite (93%) and silicon (79.4%) anodes to around 100% without generating excessive Li residue, and increases the capacity of Li-ion full cells by 8%. The cycle life of Li metal full cells is prolonged by nine times using this thin Li composite anode.