Li⁺ Solvation Mediated Interfacial Kinetic of Alloying Matrix for Stable Li Anodes

Abstract

Severe lithium (Li) dendrite growth caused by the uneven overpotential deposition is a formidable challenge for high energy density Li metal batteries (LMBs). Herein, we investigate a synergetic interfacial kinetic to regulate Li deposition behavior and stabilize Li metal anode. Through constructing Li alloying matrix with a bi‐functional silver (Ag)‐Li3N blended interface, fast Li+ conductivity and high Li affinity can be achieved simultaneously, resulting in both decreased Li nucleation and mass transfer‐controlled overpotentials. Beyond these properties, a more important feature is demonstrated herein; that is, the inward diffusion depth of the Li adatoms inside of the Ag site can be restricted by the Li+ solvation structure in a highly coordinating environment. The latter feature can ensure the durability of the operational Ag sites, thereby elongating the Li protection ability of the Ag‐Li3N interface greatly. This work provides a deep insight into the synergetic effect of functional alloying structure and Li+ solvation mediated interfacial kinetic on Li metal protection.

Stabilization of the Li metal anode through constructing a LiZn alloy/polymer hybrid protective layer towards uniform Li deposition

“…Many strategies have been developed to solve side reactions between metallic Li and the electrolyte and suppress the Li dendrite growth. [9][10][11][12][13] Constructing an artificial SEI layer at the Li anode/electrolyte interface has been certified as an effective and facile method for achieving stable Li metal anodes. [14][15][16][17][18][19][20][21] Inorganic materials are attractive because of their high Li + conductivity and mechanical strength.…”