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Author Nakai, Izumi ♦ Takahashi, Kouta ♦ Shiraishi, Youhei ♦ Nakagome, Tatsuji ♦ Nishikawa, Fumishige
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ ENERGY STORAGE ♦ CRYSTAL STRUCTURE ♦ LITHIUM OXIDES ♦ NICKEL OXIDES ♦ ELECTRIC BATTERIES ♦ CATHODES ♦ JAHN-TELLER EFFECT ♦ CHEMICAL COMPOSITION ♦ FOURIER ANALYSIS ♦ EXPERIMENTAL DATA
Abstract Structural changes accompanying the electrochemical Li deintercalation of Li{sub 1{minus}x}NiO{sub 2} and Li{sub 1{minus}x}CoO{sub 2} were studied by the transmission X-ray absorption fine structure (XAFS) technique using an in situ X-ray cell of original design. The results revealed that the Jahn-Teller distortion of the Ni-O octahedra found in LiNiO{sub 2} decreased as the Li ion was removed from the cathode. The observed X-ray absorption near-edge structures (XANES) of Li{sub 1{minus}x}NiO{sub 2} and Li{sub 1{minus}x}CoO{sub 2} as a function of x are consistent with the phase transitions found by powder-diffraction studies. The Ni-O, Co-O, and Ni-Ni interatomic distances decreased almost linearly as the Li content decreased to x = 0.8, while the Co-Co distance slightly decreased to x = 0.5 and increased up to x = 0.8. The local distortion of NiO{sub 6} octahedra also decrease with increasing y in a Li(Ni{sub 1{minus}y}, Co{sub y}){sub 2} solid solution.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1998-10-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 140
Issue Number 1


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