Abstract
Fluorinated carbons (CFx)/Li primary batteries with high theoretical energy density have been applied as indispensable energy storage devices with no need for rechargeability, yet plagued by poor rate capability and narrow temperature adaptability in actual scenarios. Herein, benefiting from precise solvation engineering for synergistic coordination of anions and low-affinity solvents, the optimized cyclic ether-based electrolyte is elaborated to significantly facilitate overall reaction dynamics closely correlated to lower desolvation barrier. As a result, the excellent rate (15 C, 650 mAh g−1) at room-temperature and ultra-low-temperature performance dropping to −80 °C (495 mAh g−1 at average output voltage of 2.11 V) is delivered by the end of 1.5 V cut-off voltage, far superior to other organic liquid electrolytes. Furthermore, the CFx/Li cell employing the high-loading electrode (18–22 mg cm−2) still yields 1,683 and 1,395 Wh kg−1 in the case of −40 °C and −60 °C, respectively. In short, the novel design strategy for cyclic ethers as basic solvents is proposed to enable the CFx/Li battery with superb subzero performances, which shows great potential in practical application for extreme environments.
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This work is financially supported from the Natural Science Foundation of Jilin Province (20220508141RC).
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Liang, HJ., Su, MY., Zhao, XX. et al. Weakly-solvating electrolytes enable ultralow-temperature (−80 °C) and high-power CFx/Li primary batteries. Sci. China Chem. 66, 1982–1988 (2023). https://doi.org/10.1007/s11426-023-1638-0
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DOI: https://doi.org/10.1007/s11426-023-1638-0