Low temperature polymer electrolyte-based solid-state lithium batteries

Abstract

A Li/LiFePO 4 cell assembled with a 12 μm-thick high-strength PPLD solid electrolyte achieves stable cycling at a temperature as low as −10 °C. An ultrathin and high-strength solid polymer electrolyte (PPLD) is achieved by employing a polyethylene separator as the skeleton and incorporating a quasi-ionic-liquid for rapid lithium ion transport in poly(vinylidene fluoride- co -hexafluoropropene). No significant capacity decay is observed in the LiFePO 4 /PPLD/Li battery even at −10 °C, indicating its promising potential for low-temperature solid-state lithium batteries.