Nonaqueous electrochemical cell with improved energy density

H - Electricity – 01 – M

Patent

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Details

H01M 6/16 (2006.01) H01M 4/00 (2006.01) H01M 4/02 (2006.01) H01M 4/38 (2006.01) H01M 4/40 (2006.01) H01M 4/62 (2006.01) H01M 4/58 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2487539

This invention relates to a nonaqueous cell comprising a lithium metallic foil anode and a cathode coating comprising iron disulfide as the active material wherein the coating is applied to at least one surface of a metallic substrate that functions as the cathode current collector. In particular, the cell of the invention has improved performance on high rate discharge and is achieved, surprisingly, with an anode underbalance. The cell of the invention has an anode to cathode input that is less than or equal to 1Ø We have discovered, unexpectedly, that the energy density for the cell both volumetrically and gravimetrically can be improved by approximately 20 to 25% while only increasing the volume of the cathode coating solids by approximately 10% through a unique and novel cathode coating formulation comprising iron disulfide, graphite and acetelyne black used in conjunction with an alloyed lithium foil.

La présente invention concerne une pile non aqueuse comprenant une anode en feuille métallique au lithium et un revêtement cathodique comprenant du bisulfure de fer en tant que matière active, le revêtement étant appliqué sur au moins une surface d'un substrat métallique qui fait office de collecteur de courant cathodique. En particulier, la pile selon l'invention présente un rendement amélioré lors de la décharge rapide et est obtenue, de manière surprenante, avec un sous-équilibre d'anode. La pile selon l'invention présente un rapport entrée anode-cathode inférieur ou égal à 1,0. On a découvert, étonnament, que la densité d'énergie de la pile peut être améliorée, d'un point de vue volumétrique et gravimétrique, d'approximativement 20 à 25 % tout en augmentant seulement le volume des solides qui recouvrent la cathode d'approximativement 10 % à l'aide d'une formule de revêtement cathodique unique et nouvelle utilisée conjointement avec une feuille de lithium allié.

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