Tohoku University Technology: Realization of 4.7 V class lithium-ion battery: T20-2758
Avoid side reaction and prevent battery performance degradation
Lithium-ion battery (LIB) makes part of our live through a wide range of applications such as smartphone, mobile battery, laptop PC, car, etc. In this context, there are constant requests for performance improvement, such as operation at higher voltage. It is known that operation at high voltage results in a decrease in battery capacity and in cycle retention rate due to side reaction between the electrolyte and the positive-electrode active material. This invention overcomes the conventional issues by coating the positive-electrode active material with a layer. This coating layer reduces side reactions, which results in more stable operation at high voltage than conventional technology. This invention can improve for example the charge/discharge cycle characteristic of high-potential spinel oxide positive electrode, which is a LIB positive electrode material that does not use cobalt metal having a supply chain risk. Therefore, it can create high energy density storage battery which is low cost & risk-free metal resources.
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The revenue generated from technology transfer is reinvested as new research funding for universities and researchers, and is utilized to create further research outcomes. To ensure the smooth operation of this cycle, known as the "Intellectual Creation Cycle," we will vigorously promote technology transfer. The types of seeds we handle include patents, know-how, databases, and programs. We have established a collaborative framework by signing basic technology transfer agreements with the following universities (as of June 1, 2025): Tohoku University, Hirosaki University, Iwate University, Akita University, Fukushima University, Yamagata University, Tohoku Gakuin University, Iwate Medical University, Fukushima Medical University, Aizu University, Miyagi University, Hokkaido University, Muroran Institute of Technology, and Showa Medical University.
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