Lithium metal (Li) is the most promising anode for high energy density secondary battery system, but the dendrite growth makes it very dangerous for commercial application. An artificial SEI layer with high ionic conductivity and low electronic conductivity has proven to be an effective way to improve the stability of Li anode. Organic layer is introduced on Li surface by in-situ spontaneous reaction between Li and carboxylic acid. The as-formed carboxylate layer can effectively limit the Li deposition under it and suppress the dendrite growth. And the uniformity of the organic layer is the key factor for achieving stable cycling performance. With a homogenous carboxylate layer of 1 μm, the Li electrode can sustain 1000 h of charge-discharge cycling at 0.5 mA cm⁻². DFT calculation demonstrates that the enhanced absorption energy by oxygen atoms in lithium carboxylate contributes to the increased lithiophilicity and decreased depositing overpotential. This research provides a way for practical application of Li metal anode.

金属锂（​​Li）是高能量密度二次电池系统最有希望的阳极，但树枝状晶体的生长使其对于商业应用非常危险。已证明具有高离子电导率和低电子电导率的人造SEI层是提高Li阳极稳定性的有效方法。通过Li和羧酸之间的原位自发反应将有机层引入Li表面。形成的羧酸盐层可以有效地限制其下的Li沉积并抑制枝晶生长。有机层的均匀性是实现稳定循环性能的关键因素。通过1μm的均匀羧酸盐层，Li电极可以在0.5 mA cm ^{-2的条件下}维持1000 h的充放电循环。DFT计算表明，羧酸锂中氧原子增强的吸收能有助于增加亲硫性并减少沉积的超电势。该研究为锂金属阳极的实际应用提供了一种途径。