Ultrahigh-Capacity and Long-Life Lithium-Metal Batteries Enabled by Engineering Carbon Nanofiber-Stabilized Graphene Aerogel Film Host.
A safe, high-capacity, and long-life Li metal anode is highly desired due to recent developments in high-energy-density Li-metal batteries. However, there are still rigorous challenges associated with the undesirable formation of Li dendrites, lack of suitable host materials, and unstable chemical interfaces. Herein, a carbon nanofiber-stabilized graphene aerogel film (G-CNF film), inspired by constructional engineering, is constructed. As the host material for Li deposition, the G-CNF film features a large surface area, porous structure, and a robust skeleton that can render low local current density. This allows for dendrite-free Li deposition and mitigation of problems associated with large volume change. Importantly, the G-CNF film can keep high Li plating/stripping efficiency at nearly 99% for over 700 h with an areal capacity of 10 mA h cm-2 (the specific capacity up to 2588 mA h g-1 based on the total mass of carbon host and Li metal). The symmetric cells can stably run for more than 1000 h with low voltage hysteresis. The full cell with the LiFePO4 cathode also delivers enhanced capacity and lowered overpotential. As two-in-one host materials for both cathodes and anodes in Li-O2 batteries, the battery exhibits a capacity of 1.2 mA h cm-2 .
['Zhao|Changtai|C|', 'Yu|Chang|C|', 'Li|Shaofeng|S|', 'Guo|Wei|W|', 'Zhao|Yang|Y|', 'Dong|Qiang|Q|', 'Lin|Xiaoting|X|', 'Song|Zhongxin|Z|', 'Tan|Xinyi|X|', 'Wang|Changhong|C|', 'Zheng|Matthew|M|', 'Sun|Xueliang|X|', 'Qiu|Jieshan|J|']
graphene Li-metal batteries Li dendrite host materials high capacity