Negative electrode active particle and method for manufacturing the same
A negative electrode active material particle and a method for preparing the same are provided. The negative electrode active material particle includes SiO x (0<x≤2) and Li 2 Si 2 O 5 , and includes less than 2 wt % of Li 2 SiO 3 and Li 4 SiO 4 .
1. A negative electrode active material particle, comprising:
SiO x (0<x≤2); and
2-5 wt % of Li 2 Si 2 O 5 ,
wherein the negative electrode active material particle includes less than 2 wt % of Li 2 SiO 3 and Li 4 SiO 4 ,
wherein a carbon coating layer is formed on a surface of the SiO x (0<x≤2), and
wherein the carbon coating layer is included in an amount of 1 wt % to 10 wt % based on a total weight of the negative electrode material particle,
wherein the SiO x (0<x≤2) includes a nanocomposite structure in which Si and SiO 2 are mixed in a 1:1 molar ratio, and
the 1:1 molar ratio mixture of Si and SiO 2 is thermally treated using a two-step process comprising the steps of: performing a first heat treatment at a first temperature followed by performing a second heat treatment at a second temperature, wherein the second temperature is higher than the first temperature.
2. The negative electrode active material particle of claim 1 , wherein the SiO x (0<x≤2) includes SiO.
3. A negative electrode comprising:
a current collector; and
a negative electrode composition including the negative electrode active material particle of claim 1 , formed on at least one surface of the current collector.
4. The negative electrode of claim 3 , wherein the negative electrode composition includes the negative electrode active material particle, a conductive material, and a binder.
5. The negative electrode of claim 4 , wherein the binder includes an aqueous binder.
6. A secondary battery comprising:
a positive electrode; a negative electrode; an electrolyte solution; and selectively, a separator,
wherein the negative electrode includes the negative electrode of claim 3 .