Exploration of fluorine-free electrolytes with superior functions

进行了一项探索性研究，确定了几种适合LiPF6基电解液与锂金属阳极兼容的碳酸盐和乙醚溶剂。对于通常与LiPF6不相容的醚，开发了新的电解液制备方法和电池配置。通过增加盐浓度和添加剂来调节溶剂化结构，进一步优化了电解液，这可能会改善锂负极上(即薄的、无机的)固体电解质界面(尚未表征)。获得的库仑效率和循环寿命与基于昂贵盐(例如LiFSI)的电解液的最先进性能相当，而昂贵的盐(与LiPF6相反)在商业上是不可行的。

An exploratory study was performed in which several suitable carbonate and ether solvents were identified for a LiPF6 based electrolyte compatible with a lithium metal anode. For the ethers, which are generally incompatible with LiPF6, new electrolyte preparation methods and cell configurations were developed. The electrolytes were further optimized through solvation structure regulation by increasing the salt concentration and additives, which presumably leads to an improved (i.e. thin, inorganic) solid electrolyte interphase on the lithium anode (yet to be characterized). The obtained Coulombic efficiencies and cycle lifetimes are comparable with the state-of-the-art performance for electrolytes based on expensive salts (e.g. LiFSI) that are (contrary to LiPF6) not commercially viable.