摘要
Abstract
Lithium metal anodes are regarded as promising candidates for next-generation high-energy-density batteries owing to their ultrahigh theoretical specific capacity.However,their practical application is hindered by lithium dendrite formation and severe volume fluctuations during cycling,leading to poor cycling stability and safety concerns.Three-dimensional(3D)nickel foam,with high surface area and excellent electrical conductivity,has been investigated as a potential current collector to mitigate volume expansion and reduce local current density.Nevertheless,its intrinsic lithiophobicity induces non-uniform lithium deposition and dendrite growth,limiting the effective utilization of the 3D architecture.To overcome this limitation,we propose a facile strategy of decorating nickel foam with Ga2O3 nanosheets.These nanosheets react in situ with lithium during cycling to form Li-Ga alloys,which exhibit excellent lithiophilicity and enhanced electronic and ionic conductivity,thereby promoting uniform Li nucleation and effectively suppressing dendritic growth.Structural characterization and electrochemical measurements confirm that the modified current collector markedly improves the electrochemical performance of lithium metal anodes.Specifically,in half-cell tests with an areal capacity of 1 mAh/cm2 at 1 mA/cm2,the modified electrode achieves stable cycling for over 170 cycles with an average Coulombic efficiency of 97.8%.In symmetric cells,a low polarization voltage of 7 mV is sustained for more than 1200 h at the same current density.Furthermore,when paired with a LiFePO4 cathode in full-cell configuration,the modified anode exhibits excellent rate capability and long-term cycling stability.Overall,this work presents a simple and effective approach to achieving dendrite-free lithium metal anodes,offering new insights for the design of advanced lithium metal battery architectures.关键词
锂金属负极/三维集流体/锂镓合金/亲锂性/无枝晶Key words
lithium metal anode/three-dimensional current collector/Li-Ga alloy/lithiophilicity/dendrite-free分类
信息技术与安全科学
