Mechanically Stable UV‐Crosslinked Polyester‐Polycarbonate Solid Polymer Electrolyte for High‐Temperature Batteries,Batteries & Supercaps

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Mechanically Stable UV‐Crosslinked Polyester‐Polycarbonate Solid Polymer Electrolyte for High‐Temperature Batteries
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-03-06 , DOI: 10.1002/batt.201900228
Isabell L. Johansson ₁ , Daniel Brandell ₁ , Jonas Mindemark ₁

Affiliation

Due to the mechanism with which solid polymer electrolytes use to conduct ions, these materials are generally more suitable for high‐temperature applications where the ionic conductivity is sufficient and where liquid electrolytes show insufficient stability. To enable high‐temperature cycling of polymer electrolytes, the mechanical stability has to be improved. Herein, we report successful long‐term cycling of a solid polyester‐polycarbonate – poly(ϵ‐caprolactone‐co‐trimethylene carbonate) (poly(CL‐co‐TMC)) – electrolyte cross‐linked through the addition of multifunctional acrylates and the use of UV‐irradiation, allowing stable cycling of cells for more than 100 cycles at 80 °C, with good rate capabilities (0.2 mA cm⁻²) and Coulombic efficiencies exceeding 99 %. Both the mechanical properties and the ionic conductivity of the mechanically stabilized poly(CL‐co‐TMC) were investigated and optimized to reduce the frequency dependence of the moduli while still achieving an acceptable ionic conductivity at elevated temperature. These results indicate that the poly(CL‐co‐TMC) system can straight‐forwardly be modified to allow for higher‐temperature applications.

中文翻译：

机械稳定的用于高温电池的UV交联聚酯聚碳酸酯固体聚合物电解质

由于固态聚合物电解质用于传导离子的机制，这些材料通常更适合于离子电导率足够且液体电解质稳定性不足的高温应用。为了实现聚合物电解质的高温循环，必须提高机械稳定性。在此，我们报道了通过添加多功能丙烯酸酯和丙烯酸酯交联的固体聚酯-聚碳酸酯-聚（ε-己内酯-碳酸三亚甲基酯）（poly（CL-co-TMC））–电解质交联的成功长期循环。使用紫外线辐射，可在80°C的温度下使细胞稳定循环100多个循环，并具有良好的速率能力（0.2 mA cm ^-2），库仑效率超过99％。对机械稳定的聚（CL-co-TMC）的机械性能和离子电导率进行了研究和优化，以降低模量的频率依赖性，同时在高温下仍能获得可接受的离子电导率。这些结果表明可以直接修改poly（CL-co-TMC）系统，以允许更高温度的应用。

更新日期：2020-03-06

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