TIN COMPOUND BASED NEGATIVE ACTIVE MATERIAL, MANUFACTURING METHOD THEREOF AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME

摘要

The present invention relates to a method for manufacturing a tin-based anodal active material electrode spotlighted as an anodal active material for a large lithium secondary battery used for an electric vehicle etc. and, in particular, to a lithium secondary battery comprising a Sn-Co-Fe-C anodal active material which is a tin-based composite having an excellent battery property by solving an initial irreversible capacity in the process of controlling the kind and content of a tin-based metal ion material composite, applying an SBR-CMC water mixed binder, and adding lithium to the surface of the anodal active material electrode after producing the tin-based anodal active material with a uniform chemical composite using a Sol-Gel method. The manufacturing method according to the present invention can manufacture by a simple method the Sn-Co-Fe-C anodal active material which is a tin-based composite having a quantitative initial Ah efficiency, and facilitates mass production. The lithium secondary battery having the Sn-Co-Fe-C anodal active material according to the present invention applied thereto has properties of high output, high energy and long lifetime. [Reference numerals] (AA) First discharge specific capacity (mAh/g);(BB) First discharge specific capacity;(CC) First Ah efficiency;(DD) First Ah efficiency (%);(EE) Lithium intake amount (%)