Fluorination of ether solvents is an effective strategy to improve the electrochemical stability of non-aqueous electrolyte solutions in lithium metal batteries. However, excessive fluorination detrimentally impacts the ionic conductivity of the electrolyte, thus limiting the battery performance. Here, to maximize the electrolyte ionic conductivity and electrochemical stability, we introduce the targeted trifluoromethylation of 1,2-dimethoxyethane to produce 1,1,1-trifluoro-2,3-dimethoxypropane (TFDMP). TFDMP is used as a solvent to prepare a 2 M non-aqueous electrolyte solution comprising bis(fluorosulfonyl)imide salt. This electrolyte solution shows an ionic conductivity of 7.4 mS cm^–1 at 25 °C, an oxidation stability up to 4.8 V and an efficient suppression of Al corrosion. When tested in a coin cell configuration at 25 °C using a 20 μm Li metal negative electrode, a high mass loading LiNi_0.8Co_0.1Mn_0.1O₂-based positive electrode (20 mg cm^–2) with a negative/positive (N/P) capacity ratio of 1, discharge capacity retentions (calculated excluding the initial formation cycles) of 81% after 200 cycles at 0.1 A g^–1 and 88% after 142 cycles at 0.2 A g^–1 are achieved.

醚类溶剂的氟化是提高锂金属电池非水电解质溶液电化学稳定性的有效策略。然而，过度氟化会对电解质的离子电导率产生不利影响，从而限制电池性能。在这里，为了最大限度地提高电解质的离子电导率和电化学稳定性，我们引入了 1,2-二甲氧基乙烷的靶向三氟甲基化以产生 1,1,1-三氟-2,3-二甲氧基丙烷 (TFDMP)。以TFDMP为溶剂配制2M双(氟磺酰)亚胺盐的非水电解液。该电解质溶液的离子电导率为 7.4 mS cm ^–1在 25 °C 时，氧化稳定性高达 4.8 V，并能有效抑制铝腐蚀。当在 25 °C 下使用 20 μm Li 金属负电极在纽扣电池配置中进行测试时，高质量负载 LiNi _0.8 Co _0.1 Mn _0.1 O ₂基正电极 (20 mg cm ^–2 ) 具有负/正 (N /P) 容量比为 1，在 0.1 A g ^–1下 200 次循环后放电容量保持率（计算不包括初始形成循环）为 81%，在 0.2 A g ^–1下142 次循环后为 88% 。