Department of NanoEngineering, University of California San Diego , La Jolla, California 92093, United States.
ACS Appl Mater Interfaces. 2017 Sep 13;9(36):30635-30642. doi: 10.1021/acsami.7b08198. Epub 2017 Aug 31.
A single-component coating was formed on lithium (Li) metal in a lithium iodide/organic carbonate [dimethyl carbonate (DMC) and ethylene carbonate (EC)] electrolyte. LiI chemically reacts with DMC to form lithium methyl carbonate (LMC), which precipitates and forms the chemically homogeneous coating layer on the Li surface. This coating layer is shown to enable dendrite-free Li cycling in a symmetric Li∥Li cell even at a current density of 3 mA cm. Adding EC to DMC modulates the formation of LMC, resulting in a stable coating layer that is essential for long-term Li cycling stability. Furthermore, the coating can enable dendrite-free cycling after being transferred to common LiPF/carbonate electrolytes, which are compatible with metal oxide cathodes.
在碘化锂/有机碳酸盐（碳酸二甲酯（DMC）和碳酸乙烯酯（EC））电解质中，在锂（Li）金属上形成了单一组分的涂层。DMC 与 LiI 发生化学反应，生成碳酸甲乙酯（LMC），后者沉淀并在 Li 表面形成化学均匀的涂层。该涂层可使对称 Li∥Li 电池中的 Li 无枝晶循环，即使在 3 mA cm 的电流密度下也是如此。向 DMC 中添加 EC 可调节 LMC 的形成，从而形成稳定的涂层，这对于长期 Li 循环稳定性至关重要。此外，该涂层在转移到与金属氧化物正极兼容的普通 LiPF/碳酸盐电解质后，仍可实现无枝晶循环。
