The development of Li-ion batteries (LIBs) has been slowed down to a mere 1-2% per year. The skyrocketing price of Co (&gt;30 $USD kg-1) and Ni (&gt;15 $USD kg-1), their limited resources, and accompanying to that low energy density of intercalation-chemistry batteries make it difficult the pack cost to fall to $90-100 kWh-1 or even below. The improvements in LIB energy density (&gt; 1.0 kWh/L) at a reduced cost (&lt;$50-70 kWh-1) can be sought from conversion metal fluoride cathodes (FeF2(3), CuF2 or MFx), which exhibit 2-3 times higher energy density (in Si-/Li-anodes based cells) and low cost (6-9 USD cents for Fe and 6-7 $USD fro Cu per kg, respectively). To streamline these battery chemistries, intrinsically poor ionic conductivity of MFx, substantial volume (up to 30%) and morphological changes during cycling, active material dissolution, substantial resistance buildup, and irreversible growth of the cathode electrolyte interphase (CEI) need to be minimized. By utilizing strong and tough ionically conducting polymer electrolyte matrix and elevated temperature cycling conditions (50 °C), we demonstrated the formation of thin conformal CEI, substantial mechanical resilience, decreased internal resistance, reducing of active material dissolution, and an overall improvement in the performance of FeF2 to 300 cycles at ~400 mAh g-1.

Long cycle stability of conversion metal fluoride cathodes in polymer electrolytes

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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