Bio‐Based Solid Electrolytes Bearing Cyclic Carbonates for Solid‐State Lithium Metal Batteries
Ashish Raj, Satyannarayana Panchireddy, Bruno Grignard, Christophe Detrembleur, Jean‐François Gohy
Abstract
Abstract Green resources for lithium‐based batteries excite many researchers due to their eco‐friendly nature. In this work, a sustainable bio‐based solid‐state electrolyte was developed based on carbonated soybean oil (CSBO), obtained by organocatalyzed coupling of CO 2 to epoxidized soybean oil. CSBO coupled with lithium bis(trifluoromethanesulfonyl)imide salt on a bio‐based cellulose separator resulted in free‐standing membranes. Those membranes on electrochemical measurements exhibited ionic conductivity of around 10 −3 S cm −1 at 100 °C and around 10 −6 S cm −1 at room temperature with wide electrochemical stability window (up to 4.6 V vs. Li/Li + ) and transference number up to 0.39 at RT. Further investigations on the galvanostatic charge‐discharge of LiFePO 4 cathodes with CSBO‐based electrolyte membranes and lithium metal anodes delivered the gravimetric capacity of 112 and 157 mAh g −1 at RT and 60 °C, respectively, providing a promising direction to further develop bio‐based solid electrolytes for sustainable solid‐state lithium batteries.