Original Research ARTICLE
Graphene-Modified 3D Copper Foam Current Collector for Dendrite-Free Lithium Deposition
- 1School of Metallurgical Engineering, Xi’an University of Architecture and Technology, China
- 2Shaanxi Provincial Machinery Research Institute, China
- 3School of Metallurgy and Environment, Central South University, China
Lithium (Li) metal has been regarded as the ideal anode for the rechargeable Li-metal batteries such as Li-S and Li-air batteries. A series of problems caused by Li dendrites, such as low Coulombic efficiency (CE) and short circuit, have limited the application of Li-metal batteries. In this study, a graphene-modified three-dimensional (3D) Copper (Cu) current collector is addressed to enable dendrite-free Li deposition. After Cu foam is immersed into graphene oxide (GO) suspension, a spontaneous reduction of GO induced by Cu generates reduced graphene oxide on 3D Cu (rGO@Cu) substrate. The rGO@Cu foam not only provides large surface area to accommodate Li deposition for lowering the local effective current density, but also forms a rGO protective layer to effectively control the growth of Li dendrites. As current collector, the rGO@Cu foam shows superior properties than commercial Cu foam and planar Cu foil in terms of cycling stability and CE. The rGO@Cu foam delivers a CE as high as 98.5% for over 350 cycles at the current density of 1 mA cm−2. Furthermore, the full cell using LiFePO4 as cathode and Li metal as anode with rGO@Cu foam as current collector (LiFePO4/rGO@Cu-Li) is assembled to prove the admirable capacities and indicates commercialization of Li-metal batteries.
Keywords: ： Li metal anode1, rGO@Cu foam2, Li dendrite3, current collector4, LiFePO4 cathode5
Received: 21 Aug 2019;
Accepted: 21 Oct 2019.
Copyright: © 2019 Yu, Dang, Bai, Peng, Zheng, Zhao, Li and Fang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: PhD. Zhao Fang, School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an, China, firstname.lastname@example.org