2024 AIChE Annual Meeting
Enhancing Composite Polymer Electrolytes for All-Solid-State-Batteries By Ti3C2Tx Mxene Coupled with Anionic Covalent Organic Frameworks
All-solid-state batteries (ASSBs) have emerged as a possible solution to address the challenges faced by conventional batteries. Conventional batteries rely on liquid electrolytes which are susceptible to issues such as electrolyte leakage, dendrite formation, and thermal runaway. The improved safety of ASSBs, make them a suitable candidate for replacing liquid electrolyte-based batteries. However, the poor ionic conductivity of solid electrolytes hinders their deployment and commercialization. In this study, we present a composite polymer electrolyte (CPE) with a two-dimensional transition metal carbide, Ti3C2Tx MXene, coupled with an anionic covalent organic framework (aCOF) to enhance the composite electrolyte ionic conductivity. This novel CPE was synthesized using polyethylene oxide (PEO), lithium bis(triflouromethanesulfonyl)imide (LiTFSI), freeze-dried MXene, and aCOF. This electrolyte’s performance was compared against that of a control CPE consisting of PEO, LiTFSI, and freeze-dried MXene. The addition of aCOF improved the electrolyte thermal stability, and enhanced its ionic conductivity. The aCOF CPE was characterized through thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), and electrochemical impedance spectroscopy (EIS). After heating to 1000 °C, the aCOF CPE’s residual mass increased by 8% through TGA. The electrolyte demonstrated an increase in conductivity by two orders of magnitude due to the decrease in its crystallinity. These results demonstrate the synergy between aCOF and MXenes through enhanced thermal properties as well as improved lithium-ion transportation.