Japanese companies and universities developing materials for solid-state batteries

Japan-based Idemitsu Kosan and NGK Spar Plug, along with Shinshu University and Toyohashi University of Technology are developing materials used in solid-state lithium (Li) batteries, according to Japan-based media. .

Japanese power producer Idemitsu has cooperated with Belgian materials technology developer Umicore to develop a high-efficiency cathode in combination with solid-state electrolyte materials for use in solid-state Li batteries. , according to the Japanese company NHK and Nikan Kogyō Shimbun.

Idemitsu uses in-house petrochemical technology to produce lithium sulfide as a material for manufacturing solid-state sulfide electrolytes of solid-state Li batteries and holds several patents relating to the electrolyte.

As the solid state particle compactness of solid state Li batteries is related to the performance of these batteries, the cathode materials are fused with solid state electrolytes to increase the operating efficiency of these batteries.

Shinshu University’s Faculty of Textile Science and Technology collaborated with Japan-based Tentok Paper and LG Japan Lab to develop a nanofiber and non-woven fabric material for use as an electrolyte carrier in the solid state. Li batteries. The ultra-thin film carrier has high strength and heat resistance, which solves the problems of insufficient resistance and poor thermal stability encountered by solid-state electrolytes. All-solid-state Li batteries composed of solid-state electrolytes with such support can be used in electric vehicles to increase endurance running distance.

Toyohashi University has developed the technology which, through high polarity solvent molecules, can stably resolve Li2SX to shorten the chemical reaction time from the original 24 hours to two minutes and thus reduce the cost and time of producing solid-state electrolytes.

Japanese ceramic spark plug manufacturer NGK has developed solid-state oxide-based Li-batteries for use in aerospace equipment, electric vehicles, medical devices as well as related battery materials, and aims to commercialize these batteries in 2025.

Currently, all-solid Li battery R&D is mainly focused on oxide and sulfide models. All-sulfide solid-state Li batteries have better Li-ion conductivity and therefore greater power capacities and higher power output, while oxide models produce almost no toxic substances and are safer .

NGK uses in-house thin ceramic sheet stacking technology to manufacture solid-oxide Li-batteries with sizes from 30 to 110 mm, power capacities from 0.5 to 10 Wh, density of volumetric energy of 300 Wh/litre and extended operating temperatures from -30 to 105 degrees Celsius. Although the batteries have the highest Li ion conductivity compared to other models of oxide-based semiconductor batteries, the corresponding energy density is lower than that of high-quality Li-ion batteries. For now, the batteries can be used as backup power sources for electric vehicles.

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