Charge compensation mechanisms in Li1.16Ni0.15Co 0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure

Masatsugu Oishi, Takahiro Fujimoto, Yu Takanashi, Yuki Orikasa, Atsushi Kawamura, Toshiaki Ina, Hisao Yamashige, Daiko Takamatsu, Kenji Sato, Haruno Murayama, Hajime Tanida, Hajime Arai, Hideshi Ishii, Chihiro Yogi, Iwao Watanabe, Toshiaki Ohta, Atsushi Mineshige, Yoshiharu Uchimoto, Zempachi Ogumi

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Abstract

The redox reaction of Li1.16Ni0.15Co 0.19Mn0.50O2 positive electrode material during the charging and discharging processes was investigated by using spectroscopic methods, i.e. in situ hard X-ray absorption near edge structure (XANES) at transition metal K-edges and ex situ soft XANES at oxygen K- and transition metal L-edges. The spectral changes of constituent elements during the initial charging to 4.5 V vs. Li/Li+ are quite similar to those of conventional layer-structured positive materials, such as LiNi 1/3Mn1/3Co1/3O2. Ni2+ and Co3+ ions are fully oxidized to Ni4+ and Co4+, while Mn4+ remains unchanged. Ligand oxygen ions also take part in charge compensation. In the process of charging to 4.8 V via the plateau voltage region, no significant spectral change appears except partial reduction of Ni and Co ions in spite of lithium extraction. By discharging to 2.0 V the spectra of each element return to those of the pristine material.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalJournal of Power Sources
Volume222
DOIs
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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    Oishi, M., Fujimoto, T., Takanashi, Y., Orikasa, Y., Kawamura, A., Ina, T., Yamashige, H., Takamatsu, D., Sato, K., Murayama, H., Tanida, H., Arai, H., Ishii, H., Yogi, C., Watanabe, I., Ohta, T., Mineshige, A., Uchimoto, Y., & Ogumi, Z. (2013). Charge compensation mechanisms in Li1.16Ni0.15Co 0.19Mn0.50O2 positive electrode material for Li-ion batteries analyzed by a combination of hard and soft X-ray absorption near edge structure. Journal of Power Sources, 222, 45-51. https://doi.org/10.1016/j.jpowsour.2012.08.023