Dae Hyun Kim, Seul Gi Kang, Bo Jung Kim, Heegyoun Lee, Jinmo Kim, Chang-Bun Yoon
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引用次数: 0
摘要
锂金属阳极的实际应用受到枝晶形成、锂损耗和反应不良的限制,导致库仑效率较低。在本研究中,我们研究了岛状银原子对锂金属阳极电化学行为的影响。通过溅射和随后的退火共同沉积了一层银-铜薄膜,从而在铜基底上锚定了岛状的银原子。在银铜合金中,以可控的原子比将银靶与铜共同溅射。溅射厚度设定为 100 nm,并采用了不同的退火条件。在锂的电化学成核过程中,嵌入的岛状银原子为锂沉积提供了有效的成核位点,提高了成核密度和空间均匀性,同时减小了成核尺寸和电位。通过将银铜集流器(CC)在 600 °C 下退火,实现了紧凑无树枝状晶粒的高密度锂沉积。在电流密度为 0.5 mAcm-2 和容量为 1 mAhcm-2 的条件下,重复锂电镀和剥离 110 个循环,库仑效率高达 98.5%。相反,在相同的测试条件下,裸铜 CC 的寿命最长为 67 个周期。
Effect of the Annealing Temperature of Lithiophilic Ag–Cu Co-Deposition on the Cycling Performance of Li-Metal Anodes
Practical applications of Li-metal anodes are limited by dendrite formation, Li loss, and poor reaction, resulting in a low Coulombic efficiency. In this study, we investigated the effects of island-shaped Ag atoms on the electrochemical behavior of Li-metal anodes. A Ag–Cu film was co-deposited through sputtering and subsequent annealing to anchor the Ag atoms with an island shape on a Cu substrate. The Ag target was co-sputtered with Cu with controlled atomic ratios in the Ag–Cu alloy. The sputtering thickness was set to 100 nm, and various annealing conditions were applied. The embedded island-shaped Ag atoms provided effective nucleation sites for Li deposition during the electrochemical nucleation of Li, increasing the nucleation density and spatial uniformity while decreasing the nucleation size and potential. Compact dendrite-free high-density Li deposition was achieved by annealing the Ag–Cu current collector (CC) at 600 °C. Under repetitive Li plating and stripping for 110 cycles at a current density of 0.5 mAcm−2 and capacity of 1 mAhcm−2, a high Coulombic efficiency of 98.5% was achieved. Conversely, the bare Cu CC had a life of up to 67 cycles under the same test conditions.
期刊介绍:
Inorganics is an open access journal that covers all aspects of inorganic chemistry research. Topics include but are not limited to: synthesis and characterization of inorganic compounds, complexes and materials structure and bonding in inorganic molecular and solid state compounds spectroscopic, magnetic, physical and chemical properties of inorganic compounds chemical reactivity, physical properties and applications of inorganic compounds and materials mechanisms of inorganic reactions organometallic compounds inorganic cluster chemistry heterogenous and homogeneous catalytic reactions promoted by inorganic compounds thermodynamics and kinetics of significant new and known inorganic compounds supramolecular systems and coordination polymers bio-inorganic chemistry and applications of inorganic compounds in biological systems and medicine environmental and sustainable energy applications of inorganic compounds and materials MD