Exploration of fluorine-free electrolytes with superior functions

功能优越的无氟电解液的探索

• 批准号: 22KF0115
• 负责人: 山田 淳夫
• 金额: $ 1.86万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2023
• 资助国家: 日本
• 起止时间: 2023-03-08 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22KF0115/
• 关键词: Li-ion batteries; Anode-free batteries; Metallic lithium; LiPF6

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.

进行了一项探索性研究，其中确定了几种合适的碳酸盐和醚溶剂，用于与锂金属阳极相容的LiPF6基电解质。对于通常与LiPF6不相容的醚类化合物，研究了新的电解质制备方法和电池结构。通过增加盐浓度和添加剂对电解质的溶剂化结构进行进一步优化，这可能导致锂阳极上的固体电解质界面得到改善（即薄的，无机的）（有待表征）。所获得的库仑效率和循环寿命与基于昂贵盐（例如LiFSI）的最先进的电解质性能相当，而这些盐（与LiPF6相反）在商业上是不可行的。