The stable operation of lithium-based batteries at low temperatures is critical for applications in cold climates. However, low-temperature operations are plagued by insufficient dynamics in the bulk of the electrolyte and at electrode|electrolyte interfaces. Here, we report a quasi-solid-state polymer electrolyte with an ionic conductivity of 2.2 × 10⁻⁴ S cm⁻¹ at −20 °C. The electrolyte is prepared via in situ polymerization using a 1,3,5-trioxane-based precursor. The polymer-based electrolyte enables a dual-layered solid electrolyte interphase formation on the Li metal electrode and stabilizes the LiNi_0.8Co_0.1Mn_0.1O₂-based positive electrode, thus improving interfacial charge-transfer at low temperatures. Consequently, the growth of dendrites at the lithium metal electrode is hindered, thus enabling stable Li||LiNi_0.8Co_0.1Mn_0.1O₂ coin and pouch cell operation even at −30 °C. In particular, we report a Li||LiNi_0.8Co_0.1Mn_0.1O₂ coin cell cycled at −20 °C and 20 mA g⁻¹ capable of retaining more than 75% (i.e., around 151 mAh g⁻¹) of its first discharge capacity cycle at 30 °C and same specific current.

锂基电池在低温下的稳定运行对于寒冷气候下的应用至关重要。然而，低温操作受到大量电解质和电极界面动力学不足的困扰。在这里，我们报告了一种准固态聚合物电解质，其离子电导率在 -20 °C 时为 2.2 × 10 ^-4 S cm ^{-1 。}使用基于 1,3,5-三恶烷的前体通过原位聚合制备电解质。基于聚合物的电解质能够在锂金属电极上形成双层固体电解质界面并稳定 LiNi _0.8 Co _0.1 Mn _0.1 O ₂基于正电极，从而改善低温下的界面电荷转移。因此，枝晶在锂金属电极上的生长受到阻碍，从而即使在 -30 °C 下也能实现稳定的 Li||LiNi _0.8 Co _0.1 Mn _0.1 O ₂纽扣和软包电池操作。特别是，我们报告了一种 Li||LiNi _0.8 Co _0.1 Mn _0.1 O ₂纽扣电池在 -20 °C 和 20 mA g ^-1下循环，能够保留超过 75%（即约 151 mAh g ^-1）的电池电量在 30 °C 和相同比电流下的第一个放电容量循环。