| 摘要 |
<p>The present invention addresses the problem of obtaining porous silicon particles and porous silicon-composite particles that are suitable for use, for example, in a negative-electrode material for a lithium-ion battery that has high capacity and good cycle characteristics. In order to solve said problem, the present invention uses porous silicon particles (1), each of which comprises a plurality of silicon microparticles (3) joined together with a contiguous void and is characterized in that: the mean (x) of the particle diameters or rod diameters of said silicon microparticles is between 2 nm and 2 µm, inclusive; the standard deviation (sigma) of the particle diameters or rod diameters of the silicon microparticles is between 1 and 500 nm, inclusive; and the quotient (sigma/x) of said standard deviation (sigma) and mean (x) is between 0.01 and 0.5, inclusive. Alternatively, porous silicon-composite particles, each of which comprises a plurality of silicon microparticles and a plurality of silicon-compound particles joined together with a contiguous void and is characterized by having characteristics similar to the above, may also be used.</p> |
