| Abstract Scope |
Enabling stable lithium metal anodes is significant for developing electrochemical energy storage systems with higher energy density. However, safety hazards, infinite volume expansion, and low coulombic efficiency of lithium metal anodes hinder their practical application. We synthesized nano-thickness lithiophilic Cu-Ni bimetallic coating to prepare dendrite-free lithium metal anodes. The electron cloud migration effect caused by different electronegativities of Cu and Ni can achieve lithiophobicity/lithiophilicity transformation and promote uniform Li deposition/dissolution. By changing the ratio of Cu to Ni, the electron cloud migration can be reasonably adjusted for obtaining dendrite-free lithium anodes. As a result, the as-obtained Cu-Ni bimetallic coating can guarantee dendrite-free anodes with a stable long cycling time (>1500 hours) and a small voltage hysteresis (~26 mV). Additionally, full cells present excellent cycling stability and high coulombic efficiency. This research can open a new avenue for optimizing the lithiophilicity of materials and realizing dendrite-free anodes. |