The lithium- (Li-) metal anode is crucial for developing high-energy-density batteries, while its dendritic growth and the low charge/discharge Coulombic efficiency in organic electrolytes hinder its practical application. Herein, we employed an in situ optical microscope to investigate the effect of the electrolyte concentration and the working temperature on the Li-plating/-stripping process. It is found that a higher concentration electrolyte can suppress its side reaction to improve the charge/discharge Coulombic efficiency, and a higher temperature can help lithium plate/strip uniformly with less lithium dendritic growth. An average Coulombic efficiency was obtained as high as 99.2% for over 150 cycles with a fixed plating capacity of 2 mAh cm on copper foil in a 3 mol/kg ether-based electrolyte under 60°C, which provides an efficient and facile strategy for developing high-performance Li-metal batteries.
展开▼
机译：锂（Li）金属阳极对于开发高能量密度的电池至关重要，而其树枝状生长和有机电解质中低的库仑效率则阻碍了其实际应用。在这里，我们采用原位光学显微镜研究了电解液浓度和工作温度对镀锂/剥离工艺的影响。发现较高浓度的电解质可以抑制其副反应以提高充电/放电库仑效率，并且较高的温度可以帮助锂板/带均匀地生长而锂枝晶的生长较少。在60°C的3 ethermol / kg醚基电解质中，在150循环中，铜箔上的固定镀层容量为2 mAh cm，在超过150个循环中平均库仑效率高达99.2％，这提供了一种高效且简便的方法开发高性能锂金属电池。
展开▼
