Multilayer material based on active lithium, preparation...

Details Multilayer material based on active lithium, preparation... Multilayer material based on active lithium, preparation...

B - Operations, Transporting

32

B

B32B 15/04 (2006.01) B32B 37/00 (2006.01) C23C 14/24 (2006.01) H01M 4/04 (2006.01) H01M 4/40 (2006.01)

Patent

CA 2657492

The invention concerns a method for producing a multilayer material based on active lithium, consisting of the deposition of an active lithium film on a protection layer with a sufficient speed to substantially avoid oxidation of the lithium and/ or over a sufficient period such that the adhesion of the lithium occurs upon contact with the protection layer. A multilayer material of the invention presents excellent impedance stability and absence of dendrite formation after the cycling process, when incorporated into an electrochemical battery as anode. The batteries, the anode of which is composed of a multilayer material of the invention are particularly efficient with respect to their coulombic efficiency.

L'invention concerne un procédé d'élaboration d'un matériau multicouche à base de lithium vif, consistant à déposer un film de lithium vif sur une couche de protection avec une vitesse suffisante pour que substantiellement aucune oxydation du lithium ne se produise, et/ou pendant une durée suffisante pour que l'adhésion du lithium se développe après contact avec la couche de protection. Un matériau multicouche de l'invention, lorsqu'il est incorporé dans une batterie électrochimique comme anode, présente une excellente stabilité de l'impédance et une absence de formation de dendrites lors du cyclage. Les batteries dont l'anode est constituée par un matériau multicouche de l'invention sont particulièrement performantes en ce qui concerne leur efficacité coulombique.

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