具有硼酸酯酯交换作用的自修复和可回收聚合物电解质用于稳定离子沉积,Advanced Functional Materials

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具有硼酸酯酯交换作用的自修复和可回收聚合物电解质用于稳定离子沉积
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-01-15 , DOI: 10.1002/adfm.202212005
Binghua Zhou ₁ , Tingzhi Deng ₁ , Chaolong Yang ₁ , Mingxi Wang ₂ , Huan Yan ₁ , Zhen Yang ₁ , Zhipeng Wang ₁ , Zhigang Xue ₃

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固体聚合物电解质的损坏会导致机械性能下降、短路或功能故障。因此，在固体聚合物电解质中引入自愈功能是提高电解质系统安全性和可靠性的理想策略。在此，通过硫醇和环氧基团之间的热引发开环反应，开发了具有优异机械性能和界面稳定性的动态硼酸酯基自修复聚合物电解质（DB-SHPEs）。含有硼酸酯键的 DB-SHPEs 不仅可以通过硼酸酯酯交换改变拓扑结构并表现出良好的自修复能力，而且还可以通过硼原子和盐阴离子之间的路易斯酸碱相互作用使锂离子均匀沉积在锂金属上. 此外，硼酸酯键可以利用缔合酯交换反应赋予DB-SHPE可再加工性和可回收性。更重要的是，Li/DB-SHPE/Li 对称电池在循环 1200 小时后表现出稳定的电压平台，而 LiFePO₄ /DB-SHPE/Li电池表现出优异的循环性能，表明具有多种功能的高性能自修复聚合物电解质是很有前途的下一代锂金属电池材料。

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Self-Healing and Recyclable Polymer Electrolyte Enabled with Boronic Ester Transesterification for Stabilizing Ion Deposition

Damage to solid polymer electrolytes can lead to mechanical degradation, short circuits, or functional failures. Therefore, introducing a self-healing function to solid polymer electrolytes is an ideal strategy to improve the safety and reliability of electrolyte systems. Herein, dynamic boronic ester-based self-healing polymer electrolytes (DB-SHPEs) with excellent mechanical properties and interfacial stability are developed via a thermally initiated ring-opening reaction between thiol and epoxy groups. The DB-SHPEs containing boronic ester bonds can not only alter the topologies via boronic ester transesterification and exhibit good self-healing capability but also enable homogeneous deposition of Li ions on the Li metal through the Lewis acid–base interactions between boron atoms and salt anions. Furthermore, the boronic ester bonds can endow the DB-SHPE with reprocessability and recyclability taking advantage of associative transesterification reaction. More significantly, the Li/DB-SHPE/Li symmetric cells exhibit a stable voltage plateau after cycling for 1200 h and the LiFePO₄/DB-SHPE/Li batteries present excellent cycling performance, suggesting that high-performance self-healing polymer electrolytes with multiple functions are promising materials for the next-generation lithium metal batteries.

更新日期：2023-01-15

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