Poly(ethylene oxide)-based electrolytes are well known candidates to replace the long-developed organic carbonates thanks to their improved safety and processability. Decades of research has brought about many promising versions of polymer electrolytes, where most either incorporate fillers of all natures or copolymerize with other materials to enhance the polymers’ notoriously inferior ionic transport properties and electrode compatibility. On another note, fluoroethylene carbonate (FEC), a fluorinated counterpart of ethylene carbonate commonly used in the conventional electrolyte for lithium-ion batteries (LIB), has been consistently shown to establish very stable electrode-electrolyte interface in liquid electrolytes, but hardly is its effect discussed in polymer electrolytes. In this study, an FEC-contained PEO electrolyte induced a multi-fold capacity boost thanks to the stable solid electrolyte interphase (SEI) formed by FEC. The achieved all-solid lithium-ion polymer battery was found to reach maximal performance with 10wt% FEC added due to the optimal (de)lithiation across polymer-graphite interface where desolvation of lithium-ions was key.

All-solid fluoroethylene carbonate-based polymer electrolyte lithium-ion batteries

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ACS Fall 2022

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