Electrode material for lithium secondary battery, electrode...

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H01M 4/36 (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 2462168

There are provided an electrode material for a lithium secondary battery which comprises alloy particles comprising silicon as a major component and having an average particle diameter of 0.02 µm to 5 µm, wherein the size of a crystallite of the alloy is not less than 2 nm but no more than 500 nm and an intermetallic compound containing at least tin is dispersed in a silicon phase and an electrode material for a lithium secondary battery which comprises alloy particles comprising silicon as a major component and having an average particle diameter of 0.02 µm to 5 µm, wherein the size of a crystallite of the alloy is not less than 2 nm but no more than 500 nm and an at least one intermetallic compound containing at least one element selected from the group consisting of aluminum, zinc, indium, antimony, bismuth and lead is dispersed in a silicon phase: Thereby, an electrode material for a lithium secondary battery, an electrode structure comprising the electrode material and a secondary battery comprising the electrode structure are provided in which a drop in capacity due to repeated charging/discharging is small, and the charge/discharge cycle life is improved.

La présente concerne un matériau d'électrode pour une pile secondaire au lithium, formée de particules d'alliage, dont le principal élément est le silicium, le diamètre moyen des particules étant de 0,02 µm à 5 µm, tandis que la taille de la cristallite de l'alliage a un diamètre d'au moins 2 nm et d'au plus 500 nm; un composé intermétallique constitutif renfermant au moins de l'étain est dispersé dans une phase de silicium et un matériau d'électrode d'une pile secondaire au lithium formée de particules d'alliage, dont le principal élément est le silicium, le diamètre moyen des particules étant de 0,02 µm à 5 µm, tandis que la taille de la cristallite de l'alliage a un diamètre d'au moins 2 nm et d'au plus 500 nm; un composé intermétallique constitutif renfermant au moins un élément du groupe composé de l'aluminium, du zinc, de l'indium, de l'antimoine, du bismuth et du plomb, et dispersé dans une phase de silicium. Il s'ensuit que cette invention se rapporte à un matériau d'électrode destiné à une pile secondaire au lithium et à une structure d'électrode composée de matériau d'électrode et d'une pile secondaire dont l'affaiblissement de la capacité provoquée par la charge et la décharge successives est faible, tandis que le cycle de charge et de décharge de la pile est amélioré.

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