In this work, a multifunctional 2m dual-salt sulfolane (TMS)/ethyl acetate (EA)-based localized high-concentration electrolyte (LHCE) with 10 wt% fluorocarbonate (FEC) is reported. Its incorporation into a Li||Ni_0.5Co_0.2Mn_0.3O₂ battery enables it to maintain nearly 89% capacity retention after 200 cycles with 1 C (200 mA g⁻¹) charge/discharge current density charged to 4.6 V at 25 °C, showing good high-voltage cyclic stability. A superior 10 C high-rate performance with 65% (≈130 mAh g⁻¹) specific capacity is also achieved. Furthermore, it still remains a liquid and exhibits good ionic conductivity even at −80 °C, and enables Li||Ni_0.5Co_0.2Mn_0.3O₂ batteries to deliver more than 50% of their room-temperature capacity at −40 °C and remains stable for over 200 cycles under the same condition as before, realizing outstanding low-temperature fast-charging/discharging performance. It also demonstrates compatibility with both lithium metal and graphite anode. All in all, this work provides a new idea for the design of a fast-dynamic, high-voltage, and low-temperature lithium battery electrolyte. The findings of this work indicate that LHCEs made directly from the optimal high-concentration electrolyte are not the most suitable approach, combining the diluent with an additive is necessary and effective.

中文翻译：

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一种用于宽温度范围快速动态高压锂电池的多功能双盐局部高浓度电解质

在这项工作中，报道了一种多功能 2m 双盐环丁砜 (TMS)/乙酸乙酯 (EA) 基局部高浓度电解质 (LHCE)，具有 10 wt% 的碳氟酸盐 (FEC)。将其结合到 Li||Ni _0.5 Co _0.2 Mn _0.3 O ₂电池中，使其在 25° 、1 C (200 mA g ^-1 ) 充电/放电电流密度下充电至 4.6 V循环 200 次后仍能保持近 89% 的容量保持率C、显示出良好的高压循环稳定性。还实现了具有 65% (≈130 mAh g ^-1 ) 比容量的卓越 10 C 高倍率性能。此外，即使在 -80 °C 下，它仍保持液体状态并表现出良好的离子导电性，并使 Li||Ni _0.5 Co _0.2Mn _0.3 O ₂电池在-40°C时可提供50%以上的室温容量，并在与以前相同的条件下保持稳定超过200次循环，实现出色的低温快速充电/放电性能。它还证明了与锂金属和石墨阳极的兼容性。总而言之，这项工作为快速动态、高电压、低温锂电池电解液的设计提供了新思路。这项工作的结果表明，直接由最佳高浓度电解质制成的 LHCE 不是最合适的方法，将稀释剂与添加剂结合使用是必要且有效的。