ANODE ACTIVE MATERIAL, METHOD OF PREPARING THE SAME, ANODE AND LITHIUM BATTERY CONTAINING THE MATERIAL

摘要

A negative electrode active material is provided to comprise silicon oxide having a low oxygen content, and to improve charge and discharge capacity and capacity holding ratio of a negative electrode active material. A method for preparing a silicon oxide-based composite negative electrode active material includes the steps of: reacting a silane compound represented by the following formula 1 of SiX_nY_(4-n) with a lithium metal to prepare a silicon oxide precursor; and firing the silicon oxide precursor at a temperature range between 400 and 1300 °C under an inert atmosphere. In the formula 1, n is an integer between 2 and 4, X is halogen, and Y is hydrogen, a phenyl group, or a C1-10 alkoxy group.