Kazuhiko Matsumoto received his PhD degree in 2004 at Kyoto University. His current research interests are focused on new electrode materials and electrolytes for Li- and Na secondary batteries and investigation on their electrochemical and physical properties. After that, he is currently an Assistant Professor in the Graduate School of Energy Science at Kyoto University. He was the recipient of research fellowships for young scientist from the Japan Society for the Promotion of Science (JSPS) from 2019. Jinkwang Hwang received Master and PhD degrees in Energy Science from Kyoto University, Japan under the supervision of Prof.
The realistic prospects and future challenges associated with developing pseudo-solid-state electrolyte materials present an insight into their properties to inspire far-reaching exploration into their material characteristics and functionalities. This minireview paper summarizes recent progress in pseudo-solid-state electrolytes utilizing ionic liquids, highlighting their fundamental properties while elaborating expedient design strategies. This class of electrolytes encompassing materials such as ionogel using ionic liquids and ionic plastic crystals has been gaining rekindled interest for their unique properties that promise great strides in battery performance and diversified utility. Recent studies have reported several novel approaches, such as modifying solid-state electrolytes using ionic liquids to form the so-called “pseudo-solid-state electrolytes”. However, the actual performance of solid-state electrolytes is heavily encumbered by unexpected metal dendrite formation and typically manifests high resistances between the metal electrodes/solid-state electrolytes or grain boundaries, thereby restricting their practical applications.
Amongst them, Li-stuffed garnet type oxides, sulfides, and NASICON type solid-state electrolytes have emerged with fascinating ionic conductivity, electrochemical stability, and high safety standards, besides creating an avenue for using metal anodes to maximize energy density. The advent of solid-state electrolytes has unearthed a new paradigm of next-generation batteries endowed with improved electrochemical properties and exceptional safety.
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