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[Analysis Case] Electronic Structure and Local Structure Analysis of LIB Cathode Materials

Evaluation of valence, coordination number, and interatomic distance of cathode materials through XAFS analysis.

In recent years, as hybrid and electric vehicles have been becoming more widespread, there is a growing demand for larger and higher-performance lithium-ion secondary batteries for their power supply. To develop high-capacity positive electrode materials, it is crucial to identify the correlation between composition, structure, and electrochemical properties. By clarifying the electronic states of metal elements and their local structures in positive electrode materials through XAFS analysis using synchrotron radiation, it is possible to gain insights into the correlation between composition, structure, and electrochemical properties.

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  • EXAFS振幅.jpg
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  • Contract measurement
  • Battery cathode materials

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Tohoku University Technology: Positive electrode material for magnesium storage battery: T18-490

Realization of over 2x high potential characteristic than conventional one!

Magnesium battery has being researched and developed as a promising candidate for post lithium ion battery due to its abundant reserve and high capacity per volume. Up to now, a material with chevrel structure was almost the only known positive electrode material for practical magnesium battery. However, the electromotive force is about 1 V which is low, and a material that can generate high electromotive force has been searched.  This invention is about a material based on a spinel structure that solves above issues. By employing a defective spinel type oxide that contains defect in the cation site, this invention has succeeded to suppress the crystal structure change due to insertion and desorption of magnesium. As a result, it offers a positive electrode material with higher working potential and improved cycle characteristic than conventional material.

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