Lithium battery
Provided is a lithium battery including: a positive electrode, a negative electrode, and an organic electrolytic solution, wherein the negative electrode has a metal/metalloid nanostructure, and the organic electrolytic solution includes a lithium sulfonimide-based compound.
1. A lithium battery comprising:
a positive electrode; a negative electrode; and an organic electrolytic solution, wherein
the positive electrode comprises a positive active material comprising lithium metal oxide,
the negative electrode comprises a negative active material comprising a composite comprising a metal/metalloid nanostructure and a porous carbonaceous material,
the organic electrolytic solution comprises a lithium sulfonimide-based compound and a lithium salt that reacts with the residual water molecules in an organic solvent in the organic electrolytic solution to produce at least one of a protonic acid and a Lewis acid,
wherein the metal/metalloid nanostructure has at least one type of a structure selected from a nanowire, a nanotube, a nanobelt, and a nanorod,
wherein the metal/metalloid nanostructure comprises at least one element selected from Si, Ge and Sn, and
wherein the amount of lithium sulfonimide-based compound is about 0.05M to about 2.0M.
2. The lithium battery of claim 1 , wherein the metal/metalloid nanostructure is a nanowire.
3. The lithium battery of claim 1 , wherein the metal/metalloid nanostructure comprises at least one element selected from a Group 13 element, a Group 14 element, and a Group 15 element.
4. The lithium battery of claim 1 , wherein the nanostructure is a Si nanowire.
5. The lithium battery of claim 1 , wherein the composite comprises:
the carbonaceous material; and
the metal/metalloid nanostructure disposed on the carbonaceous material.
6. The lithium battery of claim 5 , wherein the nanostructure is a nanowire.
7. The lithium battery of claim 5 , wherein the carbonaceous substrate is spherical or tabular.
8. The lithium battery of claim 7 , wherein the carbonaceous substrate is spherical and has a circularity of about 0.7 to about 1.0.
9. The lithium battery of claim 5 , wherein the carbonaceous substrate comprises at least one selected from the group consisting of natural graphite, artificial graphite, expanded graphite, graphene, carbon black, and fullerene soot.
10. The lithium battery of claim 1 , wherein the negative active material comprises at least one selected from the group consisting of natural graphite, artificial graphite, expanded graphite, graphene, carbon black, fullerene soot, carbon nanotube, and carbon fiber.
11. The lithium battery of claim 1 , wherein the lithium sulfonimide-based compound comprises at least one selected from Li(C 6 F 5 SO 2 ) 2 , Li(FSO 2 ) 2 N, Li(CF 3 SO 2 ) 2 N, Li(C 2 F 5 SO 2 ) 2 N, and LiN(C p F 2p+1 SO 2 )(C q F 2q+1 SO 2 ),
wherein p and q are different from each other, p and q are each independently an integer of 1 to 20.
12. The lithium battery of claim 1 , wherein an amount of the lithium sulfonimide-based compound in the organic electrolytic solution is about 0.9M.
13. The lithium battery of claim 1 , wherein the lithium salt comprises at least one lithium salt selected from the group consisting of LiBF 4 , LiPF 6 , LiAsF 6 , LiSbF 6 , and LiPF 3 (CF 2 CF 3 ) 3 .
14. The lithium battery of claim 1 , wherein an amount of the lithium salt that reacts with the residual water molecules in an organic solvent in the organic electrolytic solution to produce at least one of a protonic acid and a Lewis acid is about 0.01M to about 2.0M.
15. The lithium battery of claim 1 , wherein the organic electrolytic solution comprises LiPF 6 and a lithium sulfonimide-based compound.