Solid polymer electrolyte is alternative electrolyte for replacing traditional liquid electrolyte in Li-ion battery. Its explosion and leaking problems make a battery issue. However, solid polymer electrolyte still has a quite low ion conductivity. Here, we report the self assembled Nano-structure based bicontinuous solid polymer electrolyte. Where the one phase transport lithium ions and the other impart the mechanical strength. Surfactant, ionic liquid and oil crosslinker make a long-term stable ternary water-free microemulsion. After crosslinking by photo iniatior, obtained a free standing ion gels. SAXS analyzing shows a bicontinuous Nano-structure shape and nano-scale ion channel size and exhibits high ion conductivity and lithium transference number [t+] (1.4mS/cm , t+=0.56 at room temperature). Also, half cell assembled with LFP (LiFePO4) exhibits good cycle capacity (140.49mAh/g over 100 cycles and retention was 94% at R.T, 0.1C). Bicontinuous structure demonstrates that ion channel can accelates Li ion mobility and crosslinking domain for free-standing.

Free-standing ion-conductive gels with bicontinuous transfer channels as solid polymer electrolytes for lithium-ion batteries

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.