Synthesis, characterization, and Li-electrochemical performance of highly porous Co3O4 powders

Binotto, G. ; Larcher, D. ; Prakash, A. S. ; Herrera Urbina, R. ; Hegde, M. S. ; Tarascon, J. -M. (2007) Synthesis, characterization, and Li-electrochemical performance of highly porous Co3O4 powders Chemistry of Materials, 19 (12). pp. 3032-3040. ISSN 0897-4756

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm070048c

Related URL: http://dx.doi.org/10.1021/cm070048c

Abstract

Oxidative precipitation in an aqueous medium of highly self-compacted crystallized Co3O4 dense nanoparticles (4-5 nm) leads to the formation of porous micrometric agglomerates exhibiting a well-defined porosity distribution. Postannealing of these powders induces drastic reorganizations first because of the fast removal of trapped water and then because of the particles sintering, resulting in larger inter-particle voids. Electrochemical behavior of this nanometric material precipitated at moderate temperature is found to be extremely dependent on the way the mixing with the SP conducting carbon is performed; the better performances being obtained by a soft mixing in an organic solvent. This textural effect provides a stable capacity over the first cycles (800 mA·h/g) and reveals a first cycle capacity loss of the same extent as for bulk Co3O4, implying that the nanotexturation undergone by bulk oxide particles during their first formatting cycle is not responsible for the corresponding initial loss. Through chemical analysis of the electrolyte we found that the long-term capacity fading of our materials can be mainly attributed to the dissolution of the active material within the organic electrolyte.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:16245
Deposited On:15 Nov 2010 13:59
Last Modified:03 Jun 2011 07:23

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