Showing papers by "Dominique Larcher published in 2010"
TL;DR: This Progress Report highlights the recent developments and the future prospects of the use of phases that react through conversion reactions as both positive and negative electrode materials in Li-ion batteries.
Abstract: Despite the imminent commercial introduction of Li-ion batteries in electric drive vehicles and their proposed use as enablers of smart grids based on renewable energy technologies, an intensive quest for new electrode materials that bring about improvements in energy density, cycle life, cost, and safety is still underway. This Progress Report highlights the recent developments and the future prospects of the use of phases that react through conversion reactions as both positive and negative electrode materials in Li-ion batteries. By moving beyond classical intercalation reactions, a variety of low cost compounds with gravimetric specific capacities that are two-to-five times larger than those attained with currently used materials, such as graphite and LiCoO(2), can be achieved. Nonetheless, several factors currently handicap the applicability of electrode materials entailing conversion reactions. These factors, together with the scientific breakthroughs that are necessary to fully assess the practicality of this concept, are reviewed in this report.
2,108 citations
TL;DR: In this paper, a self-healing process of the Si−CMC hydrogen bonding which can accommodate textural stresses and can evolve during cycling is proposed to be critical for Si-based electrode performances.
Abstract: Various Si/carbon/polymer composite electrodes were prepared to better understand the influence of the Si−polymer interactions on the stability of the Li−Si reaction and especially the superior performances of CMC-based (carboxy−methyl−cellulose) composites despite the large volume changes of the Si particles upon cycling. Via the modification of the composites formulation, the nature of the polymer, the nature and the amount of the substituting groups and the surface chemistry of the Si particles, together with the use of various characterization techniques (TEM, SEM, NMR−MAS, infrared spectroscopy, TGA, etc.) we could propose that the performances of the Si/Csp/CMC composite electrodes are nested in both the porous texture of the electrode and in the nature of the Si−polymer chemical bonding. A self-healing process of the rather strong Si−CMC hydrogen bonding which can accommodate textural stresses and can evolve during cycling is proposed to be critical for Si-based electrode performances. This better ...
455 citations
TL;DR: In this paper, an inverse linear relationship between the rate constant for the H 2 O 2 decomposition and the charging voltage has been found, despite differences in media and possible mechanistic differences.
Abstract: The decomposition reaction of H 2 O 2 aqueous solutions (H 2 O 2 → H 2 O + 1/2O 2 ) catalyzed by transition metal oxide powders has been compared with the charging voltage of nonaqueous Li-O 2 cells containing the same catalyst. An inverse linear relationship between Ln k (rate constant for the H 2 O 2 decomposition) and the charging voltage has been found, despite differences in media and possible mechanistic differences. The results suggest that the H 2 O 2 decomposition may be a reliable, useful, and fast screening tool for materials that promote the charging process of the Li-O 2 battery and may ultimately give insight into the charging mechanism.
104 citations
TL;DR: In this article, the authors highlight the recent developments and future prospects of the use of phases that react through conversion reactions as both positive and negative electrode materials in Li-ion batteries, and present a variety of low cost compounds with gravimetric specific capacities that are two-to-five times larger than those attained with currently used materials, such as graphite and LiCoO2.
Abstract: Despite the imminent commercial introduction of Li-ion batteries in electric drive vehicles and their proposed use as enablers of smart grids based on renewable energy technologies, an intensive quest for new electrode materials that bring about improvements in energy density, cycle life, cost, and safety is still underway. This Progress Report highlights the recent developments and the future prospects of the use of phases that react through conversion reactions as both positive and negative electrode materials in Li-ion batteries. By moving beyond classical intercalation reactions, a variety of low cost compounds with gravimetric specific capacities that are two-to-five times larger than those attained with currently used materials, such as graphite and LiCoO2, can be achieved. Nonetheless, several factors currently handicap the applicability of electrode materials entailing conversion reactions. These factors, together with the scientific breakthroughs that are necessary to fully assess the practicality of this concept, are reviewed in this report.
60 citations
TL;DR: The formation/evolution of precipitates in alcoholic media containing Co(II+) and Li(+) species, together with the evolution of the composition and structure/texture of the resulting solid phases during the aging process at controlled constant temperature are detailed.
Abstract: In this paper, we detailed the formation/evolution of precipitates in alcoholic media containing CoII+ and Li+ species, together with the evolution of the composition and structure/texture of the r...
8 citations
TL;DR: In this article, a new synthesis route for the direct and controlled precipitation of monodispersed nanometric LiMO 2 powders in alcoholic media tackling the difficulty to simultaneously hydrolyze lithium and transition metal ions in aqueous medium.
6 citations