Negative electrode of battery

Abstract

A method for manufacturing silicon flakes includes steps as follows. A silicon material is contacted with a machining tool which includes at least one abrasive particle fixedly disposed thereon. The silicon material is scraped along a displacement path with respect to the machining tool to generate the silicon flakes having various particle sizes.

What is claimed is: 
     
         1 . A negative electrode of a battery, comprising:
 a plurality of silicon scraps with a flake shape; and   an active material, wherein the silicon scraps are dispersed among the active material, and the active material comprises silicon carbide.   
     
     
         2 . The negative electrode of the battery of  claim 1 , wherein a thickness of the silicon scrap is between 50 nm to 200 nm. 
     
     
         3 . The negative electrode of the battery of  claim 1 , wherein a particle size of the silicon scrap is in a range of 50 nm to 9 μm. 
     
     
         4 . The negative electrode of the battery of  claim 3 , wherein the particle size of the silicon scrap is in a range of 50 nm to 300 nm. 
     
     
         5 . The negative electrode of the battery of  claim 1 , wherein a thickness of the silicon scrap is between 50 nm to 200 nm, and a particle size of the silicon scrap is in a range of 50 nm to 300 nm. 
     
     
         6 . The negative electrode of the battery of  claim 1 , wherein an amount of the silicon scraps is equal to or greater than 5 parts by weight based on 100 parts by weight of the negative electrode. 
     
     
         7 . The negative electrode of the battery of  claim 1 , wherein the active material comprises a carbon material. 
     
     
         8 . The negative electrode of the battery of  claim 7 , wherein the active material comprises a binder. 
     
     
         9 . The negative electrode of the battery of  claim 1 , wherein the active material comprises a plurality of kinds of carbon materials. 
     
     
         10 . The negative electrode of the battery of  claim 7 , wherein the active material comprises graphite. 
     
     
         11 . The negative electrode of the battery of  claim 1 , wherein the active material comprises metal. 
     
     
         12 . The negative electrode of the battery of  claim 11 , wherein the metal is nickel. 
     
     
         13 . The negative electrode of the battery of  claim 8 , wherein the silicon scrap has a first surface along a long axis direction, and the first surface of the silicon scrap is bonding with the binder. 
     
     
         14 . The negative electrode of the battery of  claim 13 , further comprising a conductive agent mixing with the silicon scraps and the binder. 
     
     
         15 . The negative electrode of the battery of  claim 1 , wherein the active material comprises a binder. 
     
     
         16 . The negative electrode of the battery of  claim 15 , wherein the silicon scrap has a first surface along a long axis direction, and the first surface of the silicon scrap is bonding with the binder. 
     
     
         17 . The negative electrode of the battery of  claim 16 , further comprising a conductive agent mixing with the silicon scraps and the binder. 
     
     
         18 . The negative electrode of the battery of  claim 15 , wherein the active material comprises a plurality of kinds of carbon materials. 
     
     
         19 . The negative electrode of the battery of  claim 18 , wherein the active material comprises graphite. 
     
     
         20 . The negative electrode of the battery of  claim 18 , wherein the active material comprises nickel.