Quasi-Solid-State Ion-Conducting Arrays Composite Electrolytes with Fast Ion Transport Vertical-Aligned Interfaces for All-Weather Practical Lithium-Metal Batteries

作者：Xinyang Li, Y. Wang, Kai Xi, Wei Yu, Jie Feng, Guoxin Gao, Hu Wu, Qiu Jiang, A. Abdelkader, Weibo Hua, G. Zhong, Shujiang Ding · 发表于：Nano-Micro Letters · 年份：2022 · DOI：10.1007/s40820-022-00952-z · 被引用次数：74 · 研究领域：Medicine

The composite gel electrolyte with low tortuosity ion-conducting arrays (GPE/ICAs) exhibiting high room-temperature ionic conductivity (1.08 mS cm^−1) was successfully prepared by directionally growing ice crystals and in-situ polymerization. The stable and rapid Li^+ migration through ICAs in the GPE is proved by ^6Li solid-state nuclear magnetic resonance and synchrotron radiation X-ray diffraction combined with computer simulations. Li/LiFePO_4 full cells using GPE/ICAs exhibit excellent cycle performance and high-capacity retention at wide temperature (0–60 °C), which has the potential towards all-weather practical solid-state batteries. The rapid improvement in the gel polymer electrolytes (GPEs) with high ionic conductivity brought it closer to practical applications in solid-state Li-metal batteries. The combination of solvent and polymer enables quasi-liquid fast ion transport in the GPEs. However, different ion transport capacity between solvent and polymer will cause local nonuniform Li^+ distribution, leading to severe dendrite growth. In addition, the poor thermal stability of the solvent also limits the operating-temperature window of the electrolytes. Optimizing the ion transport environment and enhancing the thermal stability are two major challenges that hinder the application of GPEs. Here, a strategy by introducing ion-conducting arrays (ICA) is created by vertical-aligned montmorillonite into GPE. Rapid ion transport on the ICA was demonstrated by ^6Li soli...