Bimetallic composite induced ultra-stable solid electrolyte interphase for dendrite-free lithium metal anode

The NiLi-BC electrode forms regular interfacial electric field near the electrode surface, which is favorable to eliminate the local concentration polarization and induce the generation of the stable and long-term effective SEI during the Li plating and striping processes. As a result, the NiLi-BC electrode exhibits a Li dendrite-free feature and ultra-stable cycling performance with a low overpotential. [Display omitted] •Bimetallic composite induced ultra-stable solid electrolyte interphase on the surface of the electrode.•The bimetallic composite is contributed to uniform Li deposition.•The strategy is facile and effective enough to provide a feasible road for the engineering application of Li metal anode. Lithium metal is the most promising anode materials for the next generation lithium ion battery. However, the electrode polarization leads to the formation of dendrites and “dead lithium”, which degrades the performance of lithium metal batteries and induce a variety of security risk. The electrode polarization and lithium dendrites can be suppressed by lithium metal composite electrode. Herein, a simple and effective strategy is adopted to construct nickel and lithium bimetallic composite (NiLi-BC) electrode by a double roll process. The Ni framework inside the electrode can optimize the electric field and Li+ distribution at the electrode/electrolyte interface and induce the uniform lithium deposition. As a result, the NiLi-BC exhibits a lithium dendrite-free feature and stable cycling performance under a low overpotential (