CRYSTAL STRUCTURE OF γ-Li_xFe_2O_3 WITH ELECTROCHEMICAL INSERTION OF Li

Acta Metall Sin

1992, Vol. 28

Issue (8): 77-83 DOI:

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CRYSTAL STRUCTURE OF γ-Li_xFe_2O_3 WITH ELECTROCHEMICAL INSERTION OF Li

HUANG Jianshun; CHEN Junming (Shanghai Institute of Metallurgy; Academia Sinica)

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HUANG Jianshun; CHEN Junming (Shanghai Institute of Metallurgy; Academia Sinica). CRYSTAL STRUCTURE OF γ-Li_xFe_2O_3 WITH ELECTROCHEMICAL INSERTION OF Li. Acta Metall Sin, 1992, 28(8): 77-83.

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Abstract Crystal structure of γ-Li_xFe_2O_3, inserted Li electrochemically, was studied by Mossbauer spectroscopy together with X-ray diffraction, XPS and electrochemical method. On the insertion of Li with low current density, the crystal structure is keeping original spinel; while with higher current desity or by thermal activation, owing to violent movement of Li~+ ions, part of crystal structure transforms into rock type similar to face—centered cubic structure of ferrous oxide. The transition channel during insertion of Li and limitation of Li~+ ions to be inserted were discussed.

Key words: crystal structure γ-Li_xFe_2O_3 Li cell Mossbauer spectroscopy

Received: 18 August 1992

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