Tokyo University of Science researchers demonstrated unprecedented control of response speed by over two orders of magnitude in a solid state battery. This is a major steppingstone towards realization of commercial all-solid-state batteries.
‘s high surface resistance causes these batteries to have low output, limiting their applications. The researchers have employed a novel technique to investigate and modulate electric double layer dynamics at the solid/solid electrolyte interface. The achievement is carrier modulation and improved switching response speed control in these batteries.The search for clean energy and carbon neutrality, all-solid-state lithium-ion batteries offers considerable promise.
Dr. Tohru Higuchi, Associate Professor at Tokyo University of Science explained, “This occurs at the solid/solid electrolyte interface, posing a problem in all-solid-state lithium batteries.” The researchers employed an all-solid-state hydrogen-terminated diamond -based EDL transistor to conduct Hall measurements and pulse response measurements that determined EDL charging characteristics. By inserting a nanometer-thick lithium niobate or lithium phosphate interlayer between the H-diamond and lithium solid electrolyte, the team could investigate the electrical response of the EDL effect at the interface between these two layers.
The team’s article also explains how they improved the switching response time for charging ASS-EDLs. Dr. Higuchi noted, “The EDL has been shown to influence switching properties, so we considered that the switching response time for charging ASS-EDLs could be greatly improved by controlling the capacitance of the EDL. We used the non-ion-permeable property of diamond in the electron layer of the field-effect transistor and combined it with various lithium conductors.
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