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

• Published in: Energy & environmental materials (Hoboken, N.J.) N.J.), 2023-03, Vol.6 (2), p.154-n/a
• Main Authors: Wang, Xingyi, Luo, Kailin, Xiong, Lixin, Xiong, Tengpeng, Li, Zhendong, Sun, Jie, He, Haiyong, Ouyang, Chuying, Peng, Zhe
• Format: Article
• Language: English
• Subjects: Alloying; Anodes; Batteries; Deposition; Durability; Li+ solvation structure; Lithium; Lithium batteries; lithium metal anode; lithium metal batteries; Li‐Ag alloy; Mass transfer; Nucleation; SEI; Silver; Solvation
• ISSN: 2575-0356; 2575-0348; 2575-0356
• DOI: 10.1002/eem2.12317

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. A bi‐functional Ag‐Li3N blended interface is employed for producing Li alloying matrix with simultaneously decreased Li nucleation and mass transfer‐controlled overpotentials. In parallel, the durability of the operational Ag sites is enhanced profoundly by restricting the inward diffusion depth of the Li adatoms through Li+ solvation structure manipulation, resulting in much elongated protection ability for high energy density Li metal anodes.