Patent ID: 7790316

Claim:
A method for preparing composite particles, comprising: sintering primary fine particles of silicon, silicon alloy, or silicon oxide having a size of 0.8 μm to 10μm together with one or more organosilicon compounds, to obtain a sintered product; and granulating said sintered product into silicon composite particles, wherein each composite particle has a structure in which silicon or silicon alloy fine particles having a size of 0.8 μm to 10 μm are dispersed in a silicon-base inorganic compound resulting from sintering of said one or more organosilicon compound and said silicon-base inorganic compound serves as a binder, and said composite particles have a size of 0.5 to 30 μm and contain 1 to 90% by weight of said silicon or silicon alloy, and wherein voids are present within said composite particles with a void content of 5 to 70% by volume.