Structure and electrochemistry of lithium cobalt oxide synthesised at 400°C
1992; Elsevier BV; Volume: 27; Issue: 3 Linguagem: Inglês
10.1016/0025-5408(92)90062-5
ISSN1873-4227
AutoresRosalind J. Gummow, Michael M. Thackeray, William I. F. David, S. Hull,
Tópico(s)Extraction and Separation Processes
ResumoA novel LiCoO2 compound has been prepared by the reaction of Li2CO3 and CoCO3 at 400°C. Unlike the well-known LiCoO2 structure that is synthesised at higher temperature (900°C) and contains Li+ and Co3+ ions in discrete layers between planes of close-packed oxygen ions, the structure of LiCoO2 (400°C) has approximately 6% cobalt within the lithium layers. The electrochemical properties of LiCoO2 (400°C) differ significantly from LiCoO2 (900°C). Whereas electrochemical extraction from LixCoO2 (900°C) in room-temperature lithium cells takes place as a single-phase reaction above 3.9V for x≤0.9, electrochemical extraction from LixCoO2 (400°C) occurs as a two-phase reaction at an open-circuit voltage of 3.61V for 0.1<x<0.95. Because LixCoO2 (400°C) is a less oxidizing material than its high-temperature analogue, it is expected to be more stable in many of the organic-based electrolytes that are currently employed in lithium cells.
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