High-performance polymer electrolyte membrane modified with isocyanate-grafted Ti3+ doped TiO2 nanowires for lithium batteries

The Ti3+ doped TiO2 nanowires were grafted by tolylene-2,4- diisocyanate (TDI) and applied as a modifier for the preparation of organic-inorganic hybrid electrolyte in high performing lithium batteries. The PEO-based polymer electrolyte was optimized at different organic-inorganic ratios and exhibited excellent lithium-ion conductivity of 1 x 10(-4) S.cm(-1) at 30 degrees C when adding 8% TDI-TiO2 nanowires, outstanding electrochemical stability with a wide electrochemical window up to 5.5 V at 60 degrees C and a high lithium-ion transport number of 0.36. The LiFePO4[PTTNW8%]Li cells deliver excellent rate capability and cycling performance, with a high initial discharge capacity up to 151 mAtc g(-1) at 60 degrees C at 0.1 C rate and excellent capacity retention of 91% after 100th cycle. NCM811[PTTNW8%]Li high-voltage lithium batteries were also demonstrated at a 50 degrees C, which displayed a superior cycling performance. Therefore, the prepared PEO-TDI-TiO2 electrolyte is a promising polymer electrolyte for solid- state lithium batteries.

Automated summary

The Ti3+ doped TiO2 nanowires modified with tolylene-2,4- diisocyanate (TDI) showed excellent lithium-ion conductivity and electrochemical stability in PEO-based polymer electrolyte, making it a promising option for solid-state lithium batteries.