Reference : Carbon xerogels as model materials: toward a relationship between pore texture and el...
Scientific journals : Article
Engineering, computing & technology : Chemical engineering
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/192587
Carbon xerogels as model materials: toward a relationship between pore texture and electrochemical behavior as anodes for lithium-ion batteries
English
Piedboeuf, Marie-Laure mailto [Université de Liège > Department of Chemical Engineering > Ingéniérie électrochimique >]
Léonard, Alexandre mailto [Université de Liège > Department of Chemical Engineering > Ingéniérie électrochimique >]
Deschamps, Fabien mailto [Université de Liège > Department of Chemical Engineering > Ingéniérie électrochimique >]
Job, Nathalie mailto [Université de Liège > Department of Chemical Engineering > Ingéniérie électrochimique >]
May-2016
Journal of Materials Science
Springer Science & Business Media B.V.
51
9
4358-4370
Yes (verified by ORBi)
International
0022-2461
1573-4803
Dordrecht
The Netherlands
[en] Carbon xerogels ; Li-ion battery ; Anode
[en] The mechanisms of Li+ insertion in porous hard carbons used as anodes for Li-ion batteries are still a matter of debate, especially considering the divergence of electrochemical performances observed in literature. Since these materials usually exhibit several levels of porosity, the pore texture vs. electrochemical behavior relationship is difficult to establish. In this paper, we propose to use carbon xerogels, prepared from aqueous resorcinol-formaldehyde mixtures, as model materials for Li-ion battery anodes to study the influence of the pore texture on the overall electrochemical behavior. Indeed, carbon xerogels are described as microporous nodules linked together to form meso- or macroporous voids inside a 3D gel structure; the size of these voids can be tuned by changing the synthesis conditions without affecting other parameters such as the micropore volume. The materials are chosen so as to obtain identical average particle sizes, homogeneous coatings with similar thicknesses and a comparable surface chemistry. The electrochemical behavior of carbon xerogels as Li-ion anodes are correlated with the surface accessible to the electrolyte and are not dependent on the total specific surface area calculated by the BET method from nitrogen adsorption isotherms. The key parameter proposed to understand their behavior is the external surface area of the nodules, which corresponds to the surface of the meso/macropores.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/192587
10.1007/s10853-016-9748-3

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