Development of battery technologies with high operating voltages are needed to meet demands of higher energy and power from future lithium-ion batteries.  Successful advancement of electrolytes for operation at high voltages would enable high voltage cathodes and desirable lithium metal anodes with high specific capacities. <br/>Several electrolyte research thrusts can be explored to meet high voltage, cycle life, and safety demands: use of fluorinated, stabilizing additives; incorporation of ionic liquids; and development of conductive solid state or polymer electrolytes.  In this work, strategic formulations of advanced electrolytes are explored for compatibility and performance improvements with high voltage chlorinated cathode materials. Fluorinated additives, such as fluoroethylene carbonate (FEC) or hydrofluoroethers (HFEs) are explored, as well as chlorinated additives, such as chloroethylene carbonate (CEC), alternative lithium salts like lithium perchlorate, and polymer electrolytes.<br/>Voltage stabilities and electrochemical characterization of the electrolyte formulations are presented.  Structure-performance relationships of the electrolytes and the chlorinated cathode materials are assessed via Scanning Electron Microscope (SEM) and X-Ray Diffractometry (XRD).  Preliminary SEM results indicate sporadic fluorine absorption on the cycled cathodes with standard electrolyte formulations.  Electrolytes with fluorinated additives also produce inconsistent electrode surfaces, while chlorinated additives produce more consistent deposition and cycling results.  XRD analysis will be presented as well as characterization of additional liquid and polymer electrolyte formulations.

Designing next generation electrolytes for improved compatibility with high voltage cathode materials to enable high energy 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.