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Single-Ion-Conducting Gel Polymer Electrolyte Based on Lithiated Nafion
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-05-15 , DOI: 10.1021/acsapm.3c00455
Shuohao Wu 1 , Mengjun Wu 1 , Haining Zhang 1, 2 , Haolin Tang 1, 2
Affiliation  

The use of gel polymer electrolytes (GPEs) is recognized as a promising strategy to improve the safety characteristics of current lithium-ion batteries (LIBs) due to the incorporation of polymer matrix and immobilization of the liquid phase. To achieve high performance and efficient Li+ transport in GPEs, the selection of polymer is critically important. Herein, a single-ion-conducting GPE with a high lithium-ion transference number is proposed with lithiated Nafion (Li-Nafion) and polyacrylonitrile (PAN) polymers. We found that the interactions between electron-withdrawing C≡N groups Li+ facilitate fast Li+ transport and reduce the Li+ migration barrier of Li+ on the −SO3 groups. As a consequence, the designed GPE shows a high lithium-ion transference number of 0.93, an admirable ionic conductivity of 1.93 × 10–4 S cm–1, and a wide electrochemical stability window up to 5.0 V at 30 °C. Further validation of the Li|LiFePO4 cell shows a decent cycling performance with an initial discharge specific capacity of 126.1 mAh g–1 and a high capacity retention of 90.1% after 200 charge/discharge cycles at 1C. This study provides a strategy of Li-Nafion and a “decoupling” polymer to enhance the GPE performance and its applications on LIBs.

中文翻译:

基于锂化Nafion的单离子导电凝胶聚合物电解质

由于聚合物基质的结合和液相的固定,凝胶聚合物电解质(GPE)的使用被认为是提高当前锂离子电池(LIB)安全特性的有前途的策略。为了在 GPE 中实现高性能和高效的 Li +传输,聚合物的选择至关重要。在此,提出了一种具有高锂离子转移数的单离子导电 GPE,采用锂化 Nafion (Li-Nafion) 和聚丙烯腈 (PAN) 聚合物。我们发现吸电子C≡N基团Li +之间的相互作用促进了Li + 的快速传输并降低了Li +在−SO 3 –上的Li +迁移势垒。团体。因此,设计的 GPE 显示出 0.93 的高锂离子迁移数、1.93 × 10 –4 S cm –1的出色离子电导率以及在 30 °C 时高达 5.0 V 的宽电化学稳定性窗口。Li|LiFePO 4电池的进一步验证显示出良好的循环性能,初始放电比容量为 126.1 mAh g –1,在 1C 下进行 200 次充放电循环后容量保持率高达 90.1%。本研究提供了一种 Li-Nafion 和“解偶联”聚合物的策略,以提高 GPE 性能及其在 LIB 上的应用。
更新日期:2023-05-15
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