Boron doped silicon oxide based anode active material and Method of preparing for the same and Lithium secondary battery using the same

摘要

The present invention relates to a silicon oxide-based anode active material doped with a boron, a manufacturing method thereof, and a lithium secondary battery using the same. The invention provides a manufacturing method for a silicon oxide-based anode active material doped with a boron comprising the following steps: coating a dopant, which contains a boron compound, on a dummy substrate (step 1); and disposing the dummy substrate and the silicon oxide-based mixture prepared in step 1 to be positioned separated from each other and performing heat treatment (step 2). When the boron-doped silicon oxide-based material produced by the present invention is used as a negative electrode active material for a secondary battery, the specific capacity of the material is increased compared to the existing technology, and the produced material does not contain a boron compound which is an impurity, and only boron element is doped. In addition, electrochemical properties of the battery can be improved due to the increased diffusion rate of lithium ions and formation of partial silicon crystal, by allowing the boron element to be diffused into the silicon oxide-based material. Furthermore, the capacity and cycle properties of the battery are improved, and thus, the battery can be used as a secondary battery for electric vehicles and large energy storage devices in the future.