The electrochemical behaviour of Co3O4 and CoO cathodes in high-temperature cells
1982; Elsevier BV; Volume: 17; Issue: 3 Linguagem: Inglês
10.1016/0025-5408(82)90092-7
ISSN1873-4227
AutoresMichael M. Thackeray, Steven Baker, J. Coetzer,
Tópico(s)Advancements in Battery Materials
ResumoPreliminary investigations of the electrochemical behaviour of LiAlLiCl, KClCo3O4 and LiAlLiCl, KClCoO cells are reported. At an operating temperature of 420°C, maximum discharge capacities of up to 546 mA-h per gram of cobalt oxide were recorded during the early charge/discharge cycles. Cell performance deteriorated with further cycling due to (a) an instability of the cobalt oxides in the electrolyte, and (b) dispersion of the discharge product Li2O into the electrolyte. During discharge, Co3O4 was reduced via CoO to Co metal. If excess Li2O was added to the cathodes, CoO was oxidized to Co3O4 on charging, and further oxidation of Co3O4 gave rise to an unstable compound with postulated formula Li2xCo2O3+x for x ≧ 0. CoO was the most stable cobalt-oxide phase in the molten LiCl, KCl electrolyte.
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