Solid-state batteries are of wide interest owing to their high energy density and safety. Their stability with high voltage cathodes is not new to researchers and are advantageous in various terms. Polyethylene glycol and its derivatives are the most studied system in polymer electrolyte research but it also suffers from the serious setbacks with its prime backbone. Here in our work, we studied the effect of terminal group of polyethylene glycol by converting it to carbonate-ketone terminal from hydroxyl. We synthesized the polyethylene carbonate-ketone terminated by ring-opening reaction. The carbonate-ketone functionality at the chain end not only increase the electrochemical stability window &gt;5 V but also limits the parasitic reactions with lithium metal stabilising SEI at the interface. The latter demonstrated the superior galvanostatic charge-discharge of LiFePO<sub>4</sub> using as-synthesized electrolyte loaded with LiTFSI salts. This makes a vast impact on controlling the undesired decomposed products at the interface to facilitate high coulombic efficiency and capacity retention. Our study would aid with the major step on improving the higher voltage cathode with superior performance in the lithium batteries.

Determining the effect of ring-opened carbonate-ketone moieties on short-chain polyethylene glycol derivative

ACS Spring 2022

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