Multi-phase, silicon-containing electrode for a lithium-ion...

Details Multi-phase, silicon-containing electrode for a lithium-ion... Multi-phase, silicon-containing electrode for a lithium-ion...

H - Electricity

01

M

H01M 4/40 (2006.01) H01M 4/02 (2006.01) H01M 10/40 (2006.01)

Patent

CA 2535006

An electrode composition for a lithium-ion battery comprising particles having an average particle size ranging from 1 µm to 50 µm. The particles include an electrochemically active phase and an electrochemically inactive phase that share a common phase boundary. The electrochemically active phase includes elemental silicon and the electrochemically inactive phase includes at least two metal elements in the form of an intermetallic compound, a solid solution, or combination thereof. Each of the phases is free of crystallites that are greater than 1000 angstroms prior to cycling. In addition, the electrochemically active phase is amorphous after the electrode has been cycled through one full charge-discharge cycle in a lithium-ion battery.

L'invention concerne une composition électrode destinée à une batterie au lithium-ion et comprenant des particules ayant une taille moyenne de particules de l'ordre de 1 ?m à 50 ?m. Ces particules contiennent une phase électrochimiquement active et une phase électrochimiquement inactive qui partagent une limite de phase commune. La phase électrochimiquement active comprend un silicium élémentaire et la phase électrochimiquement inactive contient au moins deux éléments métaux se présentant sous la forme d'un composé intermétallique, d'une solution solide ou d'une de leurs combinaisons. Chaque phase est exempte de cristallites qui sont supérieures à 1000 angstroms avant le cycle. En outre, la phase électrochimiquement active est amorphe après que l'électrode ait été soumise à un cycle complet de charge-décharge dans une batterie au lithium-ion.

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