Lithium-ion batteries (LIBs) operating at low temperature has always been a significant challenge. In this work, Ethyl fluoroacetate (EFA) was utilized as a single solvent to design a low-temperature electrolyte (LTE). The weak Li⁺-solvent interaction facilitates fast de-solvation process and improved low-temperature performance, while the high oxidation resistance and fluorine-rich electrolyte/electrolyte interface induced by the fluorinated groups enables wide operating voltage and stable cycling of the LIBs. The EFA-based electrolyte endows the high-voltage (4.45 V) Graphite//LiCoO₂ pouch cell with prominent low-temperature adaptability (89.7 % capacity retention retains at −40 °C, and capable of charging at −20 °C) and outstanding cycling performance (87.7 % capacity retention after 400 cycles). This work sheds light on the design of high-voltage and low-temperature electrolytes for lithium-ion batteries.

在低温下运行的锂离子电池（LIB）一直是一个重大挑战。在这项工作中，氟乙酸乙酯（EFA）被用作单一溶剂来设计低温电解质（LTE）。弱的Li ⁺ -溶剂相互作用有利于快速去溶剂化过程并改善低温性能，而氟化基团引起的高抗氧化性和富氟电解质/电解质界面使LIB具有宽工作电压和稳定循环。基于EFA的电解液赋予高电压(4.45 V)石墨//LiCoO ₂软包电池优异的低温适应性（-40 °C时容量保持率为89.7 %，并且能够在-20 °C下充电）出色的循环性能（400 次循环后容量保持率为 87.7%）。这项工作为锂离子电池的高电压和低温电解质的设计提供了线索。