Li (200) with in-situ generated high entropy alloy/oxide fillers and Li2O enabling desirable Li metal anode

The development of Li metal batteries (LMBs) with high-energy density is impeded by the uncontrollable growth of Li dendrites. In this work, the Li foil is cold-pressed with ball-milled high entropy Mg/Ni/Co/Cu/Zn-based oxides (HEO), which can in-situ generate high entropy alloy/oxide and Li2O in the bulk phase and surface of composited Li anode (denoted as HEA/O@Li). During the cold-pressing process, the Li foil with polycrystalline nature transform into (200) textured Li. The in-situ generated Li2O can provide more lithiophilic sites and enrich the inorganic components of solid state interface (SEI), while the HEA/O fillers dispersed in the composited Li anode can strength corresponding mechanical stability and tune the Li+ stripping/plating process. As a result, the HEA/O@Li exhibits outstanding cycle stability for almost 1000 h at 1 mA cm−2 with fixed area capacity of 1 mAh cm−2. Moreover, the full batteries matched with LiFePO4 cathode demonstrate favorable cycling stability (110 mAh g−1 at 0.5C after 700 cycles) and rate capability. [Display omitted] •The HEA/O@Li anode can in-situ generated HEO/A and Li2O fillers.•The in-situ generated Li2O can provide more lithiophilic sites.•The in-situ generated Li2O can enrich the inorganic components of SEI.•The HEA/O@Li anode delivers a long-term cycling stability.