Patent ID: 8980428
Filing Date: 2015-03-17
Classification: H01M,Y02E,Y10T

Abstract:
1. A porous silicon particle comprises two or more silicon microparticles that are joined together, wherein an average particle diameter of said porous silicon particle is 0.1 micrometers to 1000 micrometers; said porous silicon particle has a three-dimensional network structure having a continuous void; an average porosity of said porous silicon particle is 15 to 93%; Xs/Xi which is a ratio of a porosity Xs of a surface neighborhood domain of more than 50% of a radial direction to a porosity Xi of a particle interior domain of less than 50% of a radial direction is 0.5 to 1.5; and silicon is included more than 80 atomic % in a ratio of elements except oxygen.