Material for negative electrode and nonaqueous-electrolyte...

H - Electricity – 01 – M

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H01M 4/24 (2006.01) C01B 31/00 (2006.01) H01M 4/36 (2006.01) H01M 10/26 (2006.01) H01M 4/58 (2006.01) H01M 10/36 (2006.01)

Patent

CA 2305837

A material for a negative electrode capable of preventing change in the volume of an active material occurring when lithium is doped/dedoped to improve resistance against cycle operations. A material for a negative electrode contains a mixture of a non-carbon material and a carbon material, wherein when an assumption is made that the average particle size of the non-carbon material is R M and the average particle size of the carbon material is R C, the ratio R M/R C is not higher than one, and when an assumption is made that the weight of the non-carbon material is W M and the weight of the carbon is W C, the ratio W M/W C is not higher than one or a mixture of a silicon compound and a carbon material, wherein, when an assumption is made that the average particle size of the silicon compound is R S; and the average particle size of the carbon material is R C, the ratio R Si/R C is not higher than one.

Matériau pour électrode négative capable d'empêcher toute variation du volume d'un matériau actif qui pourrait se produire lorsque du lithium est dopé/dédopé pour en améliorer la résistance contre des fonctionnements en cycles. Ce matériau pour une électrode négative contient un mélange d'une substance non carbonée et une substance carbonée, où on suppose que la grosseur moyenne des particules de la substance non carbonée est R M et que celle de la substance carbonée et R C, le rapport R M/R C ne dépassant pas la valeur unitaire (1), et où on suppose que le poids de la substance non carbonée est W M, et que celui de la substance carbonée est W C, le rapport W M/W C n'étant pas supérieur à la valeur unitaire (1), ou à celui d'un mélange d'un composé au silicium et d'une substance carbonée, où on suppose que la grosseur moyenne des particule du composé au silicium est R Si, que celle de la substance carbonée est R C, le rapport R Si/R C ne dépasse pas la valeur unitaire (1).

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