Here, we describe the synthesis of a CO2-based polycarbonate with pendent alkene groups and its functionalization by grafting methoxypolyethylene glycol in view of its application possibility in gel polymer electrolyte lithium-ion batteries. The gel polymer electrolyte is prepared by an in-situ thiol-ene click reaction between polycarbonate with pendent alkene groups and thiolated methoxypolyethylene glycol in liquid lithium hexafluorophosphate electrolyte and exhibits conductivity as remarkably high as at ambient temperature. To the best of our knowledge, this gel polymer electrolyte possesses the highest conductivity in all relevant literatures. A free-standing composite gel polymer electrolyte membrane is obtained by incorporating the gel polymer electrolyte with electrospun polyvinylidene fluoride as a skeleton. The as-prepared composite membrane is used to assemble a prototype lithium iron phosphate cell and evaluated accordingly. The battery delivers a good reversible charge-discharge capacity close to 140 mAh g-1 at 1 C rate and 25°C with only 0.022% per cycle decay after 200 cycles. This work provides an interesting molecular design for polycarbonate application in gel electrolyte lithium-ion batteries.

中文翻译：

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用于锂离子电池的 CO2 基聚碳酸酯通过硫醇-烯点击反应制备的新型凝胶聚合物电解质

在这里，鉴于其在凝胶聚合物电解质锂离子电池中的应用可能性，我们描述了具有侧链烯烃基团的 CO2 基聚碳酸酯的合成及其通过接枝甲氧基聚乙二醇进行的功能化。该凝胶聚合物电解质是通过具有侧链烯烃基团的聚碳酸酯与硫醇化甲氧基聚乙二醇在液态六氟磷酸锂电解质中通过原位硫醇-烯点击反应制备的，其电导率与环境温度一样高。据我们所知，这种凝胶聚合物电解质在所有相关文献中具有最高的电导率。该凝胶聚合物电解质以电纺聚偏二氟乙烯为骨架，得到自支撑复合凝胶聚合物电解质膜。所制备的复合膜用于组装原型磷酸铁锂电池并进行相应评估。该电池在 1 C 倍率和 25°C 下提供接近 140 mAh g-1 的良好可逆充放电容量，200 次循环后每个循环衰减仅为 0.022%。这项工作为聚碳酸酯在凝胶电解质锂离子电池中的应用提供了一个有趣的分子设计。