Safety-Enhanced Flexible Polypropylene Oxide–ZrO₂ Composite Solid Electrolyte Film with High Room-Temperature Ionic Conductivity
2021
Xu, Hui-min | Jing, Mao-xiang | Li, Jie | Huang, Zhen-hao | Wang, Teng-fei | Yuan, Wei-yong | Ju, Bo-wei | Shen, Xiang-qian
High ionic conductivity, excellent mechanical and thermal properties, and good inhibiting ability for lithium dendrites are essential requirements for polymer solid electrolytes (SEs). In this work, a flexible polypropylene oxide-based SE film was prepared by combining the bis[3-(methyldimethoxysilyl)]-terminated polypropylene oxide (BSPPO) high polymer with ZrO₂ fillers, the succinonitrile (SN) plasticizer, and the cellulose membrane framework. The cross-linking reaction of the BSPPO oligomer initiated by lithium bis(oxalate)borate at the addition of SN and ZrO₂ improves the ionic conductivity of the prepared SE as high as 9.619 × 10–⁴ S cm–¹ at room temperature with a high ion migration number of 0.8 and a high potential window of 5 V. The excellent mechanical strength, thermal stability, and good lithium dendrite inhibition ability greatly enhance the safety of the electrolyte in the use of lithium batteries. The assembled NCM622/SE/Li solid-state batteries can be stably cycled at a current density of 0.1–1 C. This safety-enhanced rigid-flexible BSPPO–ZrO₂ composite SE film with high ionic conductivity is expected to be widely used in high-performance solid-state lithium batteries.
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