Nuclear magnetic resonance (NMR) has been productively employed to investigate ion transport and solvation in standard carbonate-based Li ion battery electrolytes and in solid polymer electrolytes based on poly(ethylene oxide) (PEO). Future electrochemical power sources require new electrolytes to adapt to disruptive changes in the basic working chemistry, such as moving from Li ion to Na ion, or to Li metal electrodes. We discuss research results for a solid polymeric electrolyte based on an inexpensive commercially available polymer, semicrystalline polyphenylene sulfide, and Li salts familiar to the battery and polymer electrolyte communities such as LiTFSI. The ionic transport mechanism is unlike that which characterizes the polyethers – that is ion mobility is completely decoupled from polymer host motion, as verified by differential scanning calorimetry and nuclear magnetic resonance (NMR). This solid polymer can be reliably extruded into thin films, is non-flammable, has attractive mechanical properties for lithium dendrite suppression, is electrochemically stable against Li, and is compatible with a variety of different cathodes, including low-cobalt ones. NMR pulsed gradient measurements reveal Li self-diffusion coefficients at room temperature that are an order of magnitude higher than in the ceramic ion conductors of the LGPS class and thus the highest in any known solid. Furthermore, the Li+ transference number determined electrochemically and by NMR is &gt; 0.5. We will present additional characterization of this revolutionary material through NMR relaxometry.<br/>

Solid state NMR investigation of non-polyether polymer electrolyte for Li metal battery

256th National Meeting (2018)

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