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In situ XAFS study on cathode materials for lithium-ion batteries

Published online by Cambridge University Press:  18 March 2011

Takamasa Nonaka ,
Chikaaki Okuda ,
Yoshio Ukyo  and
Tokuhiko Okamoto
Takamasa Nonaka
Affiliation:
TOYOTA Central Research & Development Laboratories., Inc., Nagakute, Aichi, 480-1192, Japan
Chikaaki Okuda
Affiliation:
TOYOTA Central Research & Development Laboratories., Inc., Nagakute, Aichi, 480-1192, Japan
Yoshio Ukyo
Affiliation:
TOYOTA Central Research & Development Laboratories., Inc., Nagakute, Aichi, 480-1192, Japan
Tokuhiko Okamoto
Affiliation:
TOYOTA Central Research & Development Laboratories., Inc., Nagakute, Aichi, 480-1192, Japan
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Abstract

Ni and Co K-edge X-ray absorption spectra of LiNi0.8Co0.2O2 have been collected using in situ coin cells. To investigate the electronic and structural changes accompanied by the capacity fading during electrochemical cycling and keeping batteries at high temperatures, the cells with different cycling states and keeping conditions (temperature, time) were prepared. Upon charging the cell, the Ni and Co K absorption edge shifted towards higher energy, and the good correlation between the range of chemical shifts upon charging and the capacity of the cell was observed. From quantitative analysis of EXAFS data, it was revealed that the capacity fading is closely related to the Jahn-Teller distortion of the NiO6 octahedron.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG9.6
Copyright
Copyright © Materials Research Society 2001

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References

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