Solid electrolyte containing ionic liquid

1. A gel-type solid electrolyte, comprising:

an ionic liquid in a porous metal oxide prepared from a silane compound represented by the following Chemical Formula 1:

Si(R 1 ) x (OR 2 ) y (CR 3 ═CR 4 R 5 ) (4-x-y)   [Chemical Formula 1]

wherein R 1 and R 2 are each independently an alkyl group having 1 to 3 carbon atoms; R 3 , R 4 and R 5 are each independently hydrogen, a halogen element or an alkyl group having 1 to 5 carbon atoms; and x is an integer in the range of 0≦x≦3, y is an integer in the range of 1≦y≦4 and x+y is an integer in the range of 2≦x+y≦4, and

wherein the porous metal oxide comprises 30 to 50 wt % of the silane compound in which 2≦x+y≦3 in Chemical Formula 1.

2. The gel-type solid electrolyte of claim 1 , wherein the porous metal oxide is formed from a hydrolysis reaction of the silane compound of Chemical Formula 1 in the presence of an acid.

3. The gel-type solid electrolyte of claim 2 , wherein the acid is used in a range of 1 to 50 parts by volume based on the entire silane compound of Chemical Formula 1.

4. The gel-type solid electrolyte of claim 1 , wherein the porous metal oxide comprises a structure represented by the following Chemical Formula:

wherein R 3 , R 4 and R 5 are each independently hydrogen, a halogen element or an alkyl group having 1 to 5 carbon atoms.

5. The gel-type solid electrolyte of claim 1 , wherein the ionic liquid comprises one or more selected from imidazolium, ammonium, pyrrolidinium, and piperidinium as a positive ion, and one or more selected from the group consisting of bis(fluorosulfonyl)imide, bis(fluorosulfonyl)amide, fluoroborate, and fluorophosphate as a negative ion.

6. The gel-type solid electrolyte of claim 1 , wherein the ionic liquid is comprised in a range of 100 to 200 parts by weight based on 100 parts by weight of the porous metal oxide.

7. The gel-type solid electrolyte of claim 1 , further comprising: one or more lithium salts selected from LiPF 6 , LiBF 4 , LiAsF 6 , LiSbF 6 , LiCF 3 SO 3 , LiC 2 F 5 SO 3 , LiC 4 F 9 SO 3 , LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiC(CF 3 SO 2 ) 3 , and LiPF 2 {(COO) 2 } 2 .

8. The gel-type solid electrolyte of claim 7 , wherein the lithium salt is comprised in an amount of 5 to 40 wt % based on the entire solid electrolyte.

9. A lithium secondary battery comprising the solid electrolyte of claim 1 .

10. An electrochemical double layer capacitor, comprising:

a gel-type solid electrolyte that includes an ionic liquid in a porous metal oxide, the porous metal oxide being prepared from a silane compound represented by the following Chemical Formula 1:

Si(R 1 ) x (OR 2 ) y (CR 3 ═CR 4 R 5 ) (4-x-y)   [Chemical Formula 1]

wherein R 1 and R 2 are each independently an alkyl group having 1 to 3 carbon atoms; R 3 , R 4 and R 5 are each independently hydrogen, a halogen element or an alkyl group having 1 to 5 carbon atoms; and x is an integer in the range of 0≦x≦3, y is an integer in the range of 1≦y≦4 and x+y is an integer in the range of 2≦x+y≦4, and

wherein the porous metal oxide comprises 30 to 50 wt % of the silane compound in which 2≦x+y≦3 in Chemical Formula 1.

11. A gel-type solid electrolyte, comprising:

an ionic liquid in a porous metal oxide prepared from a silane compound represented by the following Chemical Formula 1:

Si(R 1 ) x (OR 2 ) y (CR 3 ═CR 4 R 5 ) (4-x-y)   [Chemical Formula 1]

wherein R 1 and R 2 are each independently an alkyl group having 1 to 3 carbon atoms; R 3 , R 4 and R 5 are each independently hydrogen, a halogen element or an alkyl group having 1 to 5 carbon atoms; and x is an integer in the range of 0≦x≦3, y is an integer in the range of 1≦y≦4 and x+y is an integer in the range of 2≦x+y≦4, and

wherein the ionic liquid is comprised in a range of 100 to 200 parts by weight based on 100 parts by weight of the porous metal oxide.

12. A lithium secondary battery comprising the solid electrolyte of claim 11 .

13. An electrochemical double layer capacitor comprising the solid electrolyte of claim 11 .