Room-temperature all-solid-state lithium metal batteries based on ultrathin polymeric electrolytes,Journal of Materials Chemistry A

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Room-temperature all-solid-state lithium metal batteries based on ultrathin polymeric electrolytes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-06-08 , DOI: 10.1039/d2ta02023h
Jianwen Feng ₁ , Jiayi Wang ₁ , Qiao Gu ₁ , Wadeelada Thitisomboon ₁ , Dahua Yao ₂ , Yonghong Deng ₂ , Ping Gao ₁

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Flexible all solid-state batteries that combine polymer electrolytes and lithium metal are required for powering wearable electronic devices as they embody high flexibility, safety and energy density. However, it has been challenging to develop room temperature flexible solid-state batteries because of the low ionic conductivities of polymeric ion conductors. Here, we report a highly conductive polymer electrolyte based on lowly viscous polyethylene oxide ion conductors confined inside an ultrastrong and ultrathin nanofibrous polyethylene membrane. The newly developed solid polymer electrolyte exhibits high room temperature charge transfer conductance (0.07 S) and excellent compatibility with Li metal (cycling time > 3500 hours at 0.1 mA cm⁻²) at 30 °C. Large-scale molecular dynamics simulations show that the high ionic conductivity is because of the enhanced segmental mobility of confined PEO inside the nanomembrane and the strong charge–dipole interactions between the PEO and lithium ions. This work provides a viable solution toward room temperature workable solid-state batteries that meet the requirements for wearable electronic devices.

中文翻译：

基于超薄聚合物电解质的室温全固态锂金属电池

为可穿戴电子设备供电需要结合聚合物电解质和锂金属的柔性全固态电池，因为它们体现了高灵活性、安全性和能量密度。然而，由于聚合物离子导体的离子电导率低，开发室温柔性固态电池一直具有挑战性。在这里，我们报告了一种基于低粘度聚环氧乙烷离子导体的高导电聚合物电解质，该离子导体限制在超强和超薄的纳米纤维聚乙烯膜内。新开发的固体聚合物电解质表现出高室温电荷转移电导（0.07 S）和与锂金属的优异相容性（0.1 mA cm ^{-2下循环时间> 3500小时）}) 在 30 °C。大规模分子动力学模拟表明，高离子电导率是由于纳米膜内受限的 PEO 的分段迁移率增强以及 PEO 和锂离子之间的强电荷-偶极相互作用。这项工作为满足可穿戴电子设备要求的室温可工作固态电池提供了可行的解决方案。

更新日期：2022-06-08

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