Umicore

Hailei Zhao

Stijn Put

Jean-Sebastien Bridel

Jing Wang

Kris Driesen

The invention relates to An active material for a rechargeable lithium ion battery, comprising metal (M) based particles and a silicon oxide SiOwith 0&#x3c;x&#x3c;2, wherein said SiOis an intimate mixture of amorphous silicon (Si) and crystalline silicon dioxide (SiO); wherein the metal (M) is preferably selected from the group consisting of Si, Sn, In, Al, Fe and combinations thereof.

Negative electrode material for a rechargeable battery and method for producing the same

The invention relates to a negative electrode powder for a lithium-ion rechargeable battery comprising a mixture comprising carbon and SiO, with 0&#x3c;x&#x3c;1, wherein the SiOconsists of a nanometric composite of crystalline SiOand amorphous Si. The method for preparing the powder comprises the steps of providing an aqueous solution comprising an anti-agglomeration agent, dispersing a silicon comprising organic compound in the aqueous solution, hydrothermally treating the aqueous solution at a temperature between 90 and 180&#xb0; C. for a period of 0.5 to 24 h, preferably between 110 and 140&#xb0; C. for a period of 0.5 to 4 h, thereby forming a suspension of SiOand Si in the aqueous solution, evaporating the solution, thereby obtaining a slurry, subjecting the slurry to a coking process whereby a solid residue is formed, calcining the solid residue at a temperature between 500 and 1300&#xb0; C., preferably between 600 and 1000&#xb0; C., in a non-oxidizing atmosphere.

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Hebei, China

Hailei Zhao