In Situ‐Formed Dual‐Conductive Protecting Layer for Dendrite‐Free Li Metal Anodes in All‐Solid‐State Batteries

Abstract

Lithium metal anode is regarded as one of the most promising electrode materials for high energy‐rechargeable batteries. Nevertheless, the utilization of lithium metal anode suffers from the detrimental lithium dendrite growth caused by uneven lithium deposition. Herein, a dual‐conductive protecting layer is formed in situ on a lithium metal surface as an artificial solid electrolyte interface, which is composed of electronic‐conductive lithiophilic lithium–gallium alloy and lithium‐ion‐conductive lithium nitride. The protective layer can not only ensure uniform lithium‐ion diffusion but also act as a nuclear agent to lower the deposition overpotential. With this artificial solid–electrolyte interface, the dendrite growth of lithium is significantly suppressed. Symmetric half cells and full cells with a modified lithium metal anode exhibit significantly improved electrochemical performance compared with the bare lithium metal anode.

Prestoring lithium in a 3D carbon fiber cloth coated with MOF-derived MnO for composite lithium anodes with high areal capacity and current density

“…EIS tests were conducted on the CFC@MnO@Li and bare Li symmetric cells to investigate the interfacial resistance (R int ). 50 Fig. S4 † presents the Nyquist plots of different symmetric cells and Table S3 † provides the simulation results (with an inset showing the equivalent circuit in Fig.…”

Highly Stable Lithium Metal Anode Constructed by Three-Dimensional Lithiophilic Materials

“…The unsupported lithium metal anode is often accompanied by unstable SEI film, uncontrollable dendrite growth, low Coulombic efficiency, short cycle life, and nearly infinite volume expansion in practical application [11,22]. Therefore, researchers developed various kinds of strategies to modify the lithium anode in order to improve its performance, and one of the breakthrough studies is the construction of a lithium alloy anode [43][44][45][46][47][48][49][50][51]. Through alloying, the uniform deposition of lithium metal is induced, which can greatly alleviate and improve the problems of lithium metal anode, thus improving the electrochemical performance and practicability of the battery.…”

“…Since then, more and more lithiophilic 3D lithium alloy anodes, such as Li-Bi [48], Li-Ga [43], Li-Sn [46], Li-Ag [50], Li-In [46], Li-Mg [51], etc., have been reported, and they verify the advantages of the lithium-philic alloying 3D anode. For the negative electrode of lithium metal alloy, we need to note that only the appropriate proportion of metal added can play a positive role.…”

Spontaneous In Situ Formation of Lithium Metal Nitride in the Interface of Garnet-Type Solid-State Electrolyte by Tuning of Molten Lithium

“…Therefore, long-term cycling will lead to lithium dendrite growth at the solid electrolyte grain boundaries and cause electrolyte failure and short-circuit the battery. The most direct way to solve wettability is to use artificial SEI layers or alloys of lithium metal with different metal elements , or composites with polymers to the solid composite electrolyte to change the mechanical properties of the electrolyte. − Most of the artificial SEI layers are modified with Li 3 N, LiCl, LiF, , and other materials for interface layer modification, which improves the wettability between the electrolyte and lithium metal layer. The alloy part is quite broad.…”