Nanowire for anode material of lithium ion cell and method of preparing the same

Abstract

The disclosure describes a nanowire for an anode material of a lithium ion cell and a method of preparing the same. The nanowire includes silicon (Si) and germanium (Ge). The nanowire has a content of the silicon (Si) higher than a content of the germanium (Ge) at a surface thereof, and has the content of germanium (Ge) higher than the content of the silicon (Si) at an inner part thereof.

What is claimed is: 
     
         1 . A nanowire for an anode material of a lithium ion cell, the nanowire comprising silicon (Si) and germanium (Ge), wherein the nanowire has a content of the silicon (Si) higher than a content of the germanium (Ge) at a surface thereof, and has the content of germanium (Ge) higher than the content of the silicon (Si) at an inner part thereof. 
     
     
         2 . The nanowire of  claim 1 , wherein the silicon (Si) has the content in a range of 1 wt % to 10 wt %, and the germanium (Ge) has the content in a range of 90 wt % to 99 wt %. 
     
     
         3 . The nanowire of  claim 1 , wherein a chemical composition of the nanowire is Ge (1-x) Si x  (0.01≦x≦0.1). 
     
     
         4 . A method of fabricating a nanowire for an anode material of a lithium ion cell, the method comprising:
 performing heat treatment with respect to the nanowire including silicon (Si) and germanium (Ge) under a hydrogen atmosphere; and   distributing the silicon (Si) and the germanium (Ge) included in the nanowire to a surface of the nanowire and an inner part of the nanowire, respectively.   
     
     
         5 . The method of  claim 4 , wherein the silicon (Si) has the content in a range of 1 wt % to 10 wt %, and the germanium (Ge) has the content in a range of 90 wt % to 99 wt %. 
     
     
         6 . The method of  claim 4 , wherein the heat treatment is performed at a temperature in a range of 700° C. to 900° C. 
     
     
         7 . A lithium ion cell including an anode including the nanowire for the anode material of the lithium ion cell according to  claim 1 .