Abstract
Current and future demands for increasing the energy density of batteries without sacrificing safety has led to intensive worldwide research on all solid state Li-based batteries. Given the physical limitations on inorganic ceramic or glassy solid electrolytes, development of polymer electrolytes continues to be a high priority. This brief review covers several recent alternative approaches to polymer electrolytes based solely on poly(ethylene oxide) (PEO) and the use of nuclear magnetic resonance (NMR) to elucidate structure and ion transport properties in these materials.
Highlights
There is an ongoing quest to exploit the full potential energy embodied in the metallic Li+ /Li electrochemical couple in practical and safe battery systems
The purpose of this review is to examine several recent developments in the literature related to nuclear magnetic resonance (NMR)-based investigations of ion transport in selected families of polymer electrolytes, most involving some modification of polyethylene oxide (PEO)
The linewidth in the lithium bis(trifluoromethanesulfonyl)imide (LiTFSI)−PEO system is heavily dependent on temperature, a consequence of the fact that the mobility of the fluorine in the LiTFSI molecules is coupled to the mobility of the PEO matrix
Summary
There is an ongoing quest to exploit the full potential energy embodied in the metallic Li+ /Li electrochemical couple in practical and safe battery systems. Using a pure lithium anode material will increase volumetric and mass specific energy density by up to a factor of two while reducing battery cell manufacturing complexity—both key steps for electrified transportation and consumer electronics [1] To this end, solid state electrolyte materials have been under investigation for many decades, and the history of polymer-based systems has been with us since the 1970’s when polyethylene oxide (PEO) containing alkali metal salts was discovered to be an ionic conductor [2].
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