MACROPOROUS SI-METAL ALLOY PARTICLES FOR HIGH-CAPACITY LITHIUM STORAGE MATERIAL AND PREPARATION METHOD THEREOF

摘要

The present invention relates to macroporous Si-metal alloy particles for a high-capacity lithium storage material and a method for preparing the same and, more particularly, to a technique for preparing porous Si-metal alloy particles as a high-capacity lithium storage material that is capable of ensuring macroporosity by elution of a part of a metal other than silicon from a Si-metal alloy through selective etching and applying this to a cathode of a lithium ion battery. The macroporous Si-metal alloy particles for a lithium storage material according to the present invention are high in capacity and are excellent in capacity maintenance property. In addition, according to the preparation method of the present invention, no expensive noble metal catalyst is used during the etching process and no additional facility cost is required for operator safety and environmental pollution prevention. Accordingly, a porous Si-metal alloy cathode material for a high-capacity lithium ion battery can be manufactured at a low production cost, and thus the present invention can be applied to capacitors, lithium secondary batteries, electric vehicles, flexible electronic equipment, etc.