Patent ID: 7803290
Filing Date: 2010-09-28
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. An electrode material for a rechargeable lithium battery, comprising a fine powder of a silicon-based material whose principal component is silicon element, wherein the fine powder has an average particle size (R) in a range of 0.1 μm≦R<0.5 μm, the fine powder has an oxidation preventive surface coat film which covers the surface of the fine powder, the oxidation preventive surface coat film comprises an oxide film, the fine powder contains oxygen element (O) in an amount in a range of 0.8 wt. %≦[O]≦4.6 wt. %, and the fine powder contains silicon element (Si) in an amount in a range of 95.0 wt. %≦[Si]≦98.8 wt. %.