Free-standing ultrathin lithium metal–graphene oxide host foils with controllable thickness for lithium batteries

Hao Chen, Yufei Yang, David T. Boyle, You Kyeong Jeong, Rong Xu, Luize Scalco Vasconcelos, Zhuojun Huang, Hansen Wang, Hongxia Wang, Wenxiao Huang, Huiqiao Li, Jiangyan Wang, Hanke Gu, Ryuhei Matsumoto, Kazunari Motohashi, Yuri Nakayama, Kejie Zhao and Yi Cui ()
Additional contact information
Hao Chen: Stanford University
Yufei Yang: Stanford University
David T. Boyle: Stanford University
You Kyeong Jeong: Stanford University
Rong Xu: Stanford University
Luize Scalco Vasconcelos: Purdue University
Zhuojun Huang: Stanford University
Hansen Wang: Stanford University
Hongxia Wang: Stanford University
Wenxiao Huang: Stanford University
Huiqiao Li: Stanford University
Jiangyan Wang: Stanford University
Hanke Gu: Stanford University
Ryuhei Matsumoto: Murata Manufacturing
Kazunari Motohashi: Murata Manufacturing
Yuri Nakayama: Murata Manufacturing
Kejie Zhao: Purdue University
Yi Cui: Stanford University

Nature Energy, 2021, vol. 6, issue 8, 790-798

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41560-021-00833-6

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