In-situ construction of lithium-tin alloy skeleton as a lithiophilic host for lithium metal anode
Guocheng Li, Zhen Han, Yuchen Tan, Qijia Wei, Eryang Mao, Junmou Du, Lin Fu
Abstract
Lithium (Li) metal holds great promise to be the ideal anode for next-generation high-energy-density Li metal battery . However, the catastrophic dendritic Li propagation and the infinite relative volume change during cycling impede the implementation of Li metal anode . Herein, lithiophilic Li 22 Sn 5 with high ionic and electronic conductivity was in-situ implanted into metallic Li matrix via a scalable mechanical kneading operations and the subsequent heat treatment protocol. Homogeneous Li 22 Sn 5 framework in as-fabricated Li/Li 22 Sn 5 composite electrode effectively promoted the even distribution of Li + flux and ions transport kinetics, thus suppressing the formation and growth of dendritic Li. Additionally, robust Li 22 Sn 5 alloy served as the ideal skeleton steadily endured the stress from the expansion and contraction of the electrode upon cycling, enabling an electrode structural integrity. As a result, the assembled full cell with coin-cell con Declaration of Interest Statementuration using high loading LiCoO 2 (16.6 mg cm −2 ) delivered an impressive capacity retention of 91.9 % for 100 cycles at 0.5 C with a low Negative/Positive (N/P) ratio of 3:1. The in-situ construction of lithiophilic alloy skeleton as a stable host provides an alternative approach for achieving long-lifespan Li metal battery .