- Methods for manufacturing composite including transition metal germanide and carbon anode material for secondary battery including composite manufactured thereby and Li-ion secondary battery comprising the same

摘要

The present invention relates to a method for preparing a transition metal germanium compound, comprising the steps of: (a) mixing a transition metal powder, a germanium (Ge) powder and a carbon (C) powder; and (b) germanium compound / carbon composite, which comprises the steps of: preparing a composite containing metal germanide and carbon (C) According to the method for producing a composite according to the present invention, a complex containing a transition metal-germanium compound and carbon can be produced simply and efficiently by using a ball milling method, which is a simple solid synthesis method, without going through a complicated and ineffective process such as a chemical method However, In addition, when the transition metal-germanium compound and the carbon-containing composite prepared by the above method are used as an electrode active material of a secondary battery, it is possible to reduce the lifetime degradation characteristics due to volume expansion, which is a disadvantage of conventional lithium alloy electrode materials for lithium secondary batteries And it is possible to realize a lithium secondary battery system having a high capacity and an excellent initial efficiency and a high capacity and an excellent cycle life.