Interfacial engineering of lithium-polymer batteries with in situ UV cross-linking

Developing promising solid-state Li batteries with capabilities of high current densities have been a major challenge partly due to large interfacial resistance across the electrode/electrolyte interfaces. This work represents an integrated network of self-standing polymer electrolyte and active electrode materials with in situ UV cross-linking. This method provides a uniform morphology of composite polymer electrolyte with low thickness of 20-40 mu m. This modification leads to promising cycling results with 85% specific capacity retention in Li||LiFePO4 cell over 100 cycles at high current densities of 170 mA g(-1) (similar to 25 mu A cm(-2), 1 C)(.) By applying this method, the interfacial resistance decreases as high as seven folds compared to noncross-linked interfaces. The following work introduce a facile and cost-effective method in developing fast-charging self-standing polymer batteries with enhanced electrochemical properties.

Automated summary

This research successfully developed a solid-state Li battery with high current density capabilities, reducing the interfacial resistance across the electrode/electrolyte interfaces. By using in situ UV cross-linking technology, a uniform thickness of 20-40 μm polymer electrolyte was prepared to achieve promising cycling performance enhancement.