Journal
NANO-MICRO LETTERS
Volume 14, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-022-00952-z
Keywords
Solid-state batteries; Composite electrolytes; Vertical-aligned ion-conducting arrays; Interfacial ion-conduction mechanism; All-weather practical electrolyte design
Funding
- Shanghai Jiao Tong University
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The rapid improvement in gel polymer electrolytes (GPEs) has brought them closer to practical applications in solid-state Li-metal batteries. By introducing ion-conducting arrays (ICA) into GPEs, rapid ion transport and enhanced electrolyte stability have been achieved.
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 Li-6 solid-state nuclear magnetic resonance and synchrotron X-ray diffraction, combined with computer simulations to visualize the transport process. Compared with conventional randomly dispersed fillers, ICA provides continuous interfaces to regulate the ion transport environment and enhances the tolerance of GPEs to extreme temperatures. Therefore, GPE/ICA exhibits high room-temperature ionic conductivity (1.08 mS cm(-1)) and long-term stable Li deposition/stripping cycles (> 1000 h). As a final proof, Li parallel to GPE/ICA parallel to LiFePO4 cells exhibit excellent cycle performance at wide temperature range (from 0 to 60 degrees C), which shows a promising path toward all-weather practical solid-state batteries.
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