Indexed on: 20 Aug '19Published on: 24 Apr '19Published in: ACS Applied Materials & Interfaces
All solid-state lithium (Li) metal batteries are attractive for next-generation electrochemical energy storage systems due to their high energy densities and good safeties. However, the incompatible interface between Li metal anode and solid-state electrolyte (SSE) limits the performance of all solid-state Li metal batteries. Here, a three dimensional (3D) electronic and ionic mixed conducting interlayer is proposed to improve the interfacial affinity in all solid-state Li metal battery. The electronic and ionic mixed 3D conducting interlayer is composed of Sn/Ni alloy layer coated Cu nanowire (Cu@SnNi) network. The Li plating study demonstrates that the Cu@SnNi network is capable of fast transport of Li+ ions from the Li metal anode to the LiFePO4 cathode, acting as a stable interlayer between Li metal anode and solid polymer electrolyte. Noticeably, all solid-state LiFePO4/Li cell with a Cu@SnNi interlayer exhibits an excellent rate capability (133 and 100 mAh g-1 for 2 and 5 C, respectively) in comparison to low rate performance of the cell without the interlayer (117 and 60 mAh g-1 for 2 and 5 C, respectively). This unique structure design of electronic and ionic mixed conducting interlayer provides an alternative strategy to improve the performance of all solid-state Li metal battery.