Rechargeable electrochemical cell having a liquid electrolyte, and a lithium/carbon anode
AssigneeAlcatel Alsthom Compagnie Generale d'Electricite
InventorsBernard Simon, Jean-Pierre Boeuve
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Abstract
A rechargeable electrochemical cell comprising a cathode, a liquid electrolyte with a solute and at least one solvent, an anode containing a highly crystallized carbon-containing material capable of intercalating lithium ions, said electrochemical cell being characterized by the fact that the surface of said carbon-containing material is provided with a thin layer which is impermeable to said electrolyte solvent, but which allows lithium to be diffused.
Claims17
A rechargeable electrochemical cell comprising a cathode, a liquid electrolyte with a solute and at least one solvent, and an anode containing a highly crystallized carbon-containing material with a degree of crystallinity dg greater than 0.8 and capable of intercalating lithium ions, wherein said carbon-containing anode material is made up of single-phase grains, the surface of each grain being provided with a thin layer which is impermeable to said electrolyte solvent, but which allows lithium to be diffused, the impermeability being either intrinsic, or caused by passivation of said layer as a result of the reactivity of said electrolyte, said thin layer of the anode material having a composition different from that of said carbon-containing material, and where the degree of crystallinity dg of the carbon-containing material is defined as
- dg=(3.44-d.sub.002)/0.086
- where d.sub.002 is the distance between graphite planes, which distance is measured by X-ray spectroscopy.
Dependencies are inferred from the claim text.