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Structural and morphological control of manganese oxide nanoparticles by aqueous precipitation. Toward improved electrochemical behavior versus lithium.
|David Portehault 1, Sophie Cassaignon 1, Emmanuel Baudrin 2, Jean-Pierre Jolivet 1|
1. Chimie de la Matiere Condensee de Paris UPMC (CMCP-UPMC), 4 place jussieu, Paris 75252, France
Recent researchs in the field of lithium batteries and their performance improvement involve nanoscaled electrode materials . Among them many oxides have been proved to present better behavior upon Li reaction in terms of rate capabilities  and reversibility [2, 3] when divided at the nanoscale. Manganese oxide nanomaterials are of particular interest from a fundamental point of view to investigate structure and size effects on the electrochemical behavior owing to their numerous phases. However, tailoring the properties of such electrodes remains a challenge since it is closely related to the control of the structure and texture. Our group thus develops the synthesis of oxide nanoparticles by precipitation in aqueous medium at low temperature .
This contribution addresses a low temperature one-step aqueous route for precipitation of manganese oxides by two different methods: reduction of MnVII and MnVII/MnII reaction. Pure Mn3O4 nanoparticles or γ-MnOOH manganite nanowires are synthesized by the first route. The second method leads to morphology control of MnO2 type oxides. On one hand the morphology of the lamellar oxide birnessite K0.19MnO2.(H2O)0.75 can be modified. On the other hand, the growth of microporous cryptomelane K0.11MnO1.85.(H2O)0.75 nanowires is proved to proceed by coarsening or oriented attachment depending on the growth direction, providing new means to control morphology via the growth conditions. Finally, well defined nanoparticles are used to investigate structure and size effects on the electrochemical behavior versus lithium.
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Presentation: Oral at E-MRS Fall Meeting 2007, Symposium A, by David Portehault
See On-line Journal of E-MRS Fall Meeting 2007
Submitted: 2007-05-21 11:39 Revised: 2009-06-07 00:44