Synergistic regulating of dynamic trajectory and lithiophilic nucleation by Heusler alloy for dendrite-free Li deposition

Lithium metal has been considered as one of the most promising materials for the next generation commercial anode due to its low potential and high energy density. However, safety issues caused by the growth of lithium dendrites hindered its commercial application. Herein, Heusler alloy of Fe2CoAl wrap around the carbon fibers is developed as Li metal host. The Fe2CoAl/C host promotes the Li-ions deposition uniformly through the synergistic regulating of dynamic trajectory and lithiophilic nucleation. As a result, the symmetrical cell achieves a stable long-term cycling up to 1000 h at 1 mA cm−2/1 mAh cm−2. The full battery with LiFePO4 as cathode achieves a stable average coulombic efficiency of 99.36% after 900 cycles at 1 C. This synergistic force engineering design provide a realizable way for next-generation high-energy-density Li metal host.