Presentation Title: Niobium Titanium Oxide Cylindrical Cells: A Promising Solution for Low-Resistance and Long-Life High-Power Batteries

Abstract: 

    Niobium titanium oxide is a promising anode material for high-power lithium-ion batteries because of its excellent fast-charging capability and long cycle life. In this study, 21700 cylindrical cells employing NTO anodes were fabricated and evaluated for high-load power tool applications. Prototype cells were successfully manufactured through optimization of electrode alignment and winding processes, demonstrating the feasibility of cylindrical NTO cell production. The cylindrical NTO cells exhibited low polarization characteristics and excellent durability. Under 45°C high-rate cycling conditions (5C discharge and 2C charge), the NTO system achieved approximately 2,200 cycles, compared with about 700 cycles for a benchmark high-power 21700 cell. Analysis also indicated that cylindrical NTO cells offer significant potential for further resistance reduction, making them attractive for applications requiring high power, rapid charging, and extended service life. These results demonstrate that NTO-based cylindrical cells are a promising solution for next-generation high-power battery systems.

Biography: 

      Yasuhiro Harada is currently a senior fellow at Toshiba corporate laboratory. He received his Ph.D. in inorganic chemistry from Tokyo University of Science in 2001. He joined Toshiba in 2002. He has been working on new battery materials for 24 years. He was awarded the Commendation for Science and Technology by Japan Minister of Education, Culture, Sports, Science and Technology, 2020. His current work is focused on the development of new battery technologies.