Electronic-structure analyses of electrode materials for rechargeable battery by operando soft X-ray absorption/emission spectroscopy

2015 Fiscal Year Final Research Report

• Project/Area Number: 25871186
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry; Analytical chemistry
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: ASAKURA Daisuke 国立研究開発法人産業技術総合研究所, 省エネルギー研究部門, 研究員 (80435619)
• Research Collaborator: HOSONO Eiji ; HARADA Yoshihisa
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: リチウムイオン電池 / 電極材料 / 酸化還元反応 / 軟X線分光 / オペランド解析

Outline of Final Research Achievements

In order to improve the performances of Li-ion-battery electrodes for applications to automobiles, detailed understandings of the charge-discharge reactions are of particular importance. In this study, an in situ cell for operando soft X-ray spectroscopy, which can directly clarify the transition-metal (TM) 3d and oxygen 2p orbitals in the electrode materials, was developed. The TM L3-edge operando soft X-ray emission spectroscopy measurements were performed for several electrode materials. For LiMn2O4, detailed information of the Mn3+ and Mn4+ states was obtained. Furthermore, a contribution of the O 2p orbital to the redox reaction was revealed.

Free Research Field

電子物性