Biomass-derived carbon fibers modified by Ag/rGO for high-performance Li metal composite anode

Li metal anode has received great attention as an ideal anode to meet the need for high-energy density batteries due to its low electrochemical redox potential and high theoretical capacity. However, the growth of Li dendrites and severe volume change hinder its practical application. In this work, the 3D Li metal composite anode (Ag/rGO-BCFs@Li) is prepared by plating Li metal into the biomass-derived carbon fibers modified by Ag and reduced graphene oxide. The 3D conductive framework of the composite anode effectively restricts the volume expansion by the abundant space of the modified fibers, and the existence of lithophilic Ag nanoparticles homogenize electric field distribution to suppress dendrite growth over cycles and rGO sheets effectively improve the stability of the electrode. So the 3D Ag/rGO-BCFs@Li anode exhibits excellent electrochemical performance of symmetric cells and LiCoO 2 full cells. Compared with the bare Li, the capacity retention rate of Ag/rGO-BCFs@Li|LiCoO 2 full cell is up to 93% after 500 cycles at 2 C, which presents high coulomb efficiency and high stability during the lithium deposition/dissolution process and a stable long cycling performance.