Non-aqueous electrolyte and secondary battery containing same

1. A non-aqueous liquid electrolyte comprising an electrolyte containing Al(CF 3 SO 3 ) 3 and a room temperature molten salt of a quaternary ammonium salt,

wherein the quaternary ammonium salt is at least one type of compound represented by the following general formula (1) or (2):

wherein R 1 -R 4 are the same or different and represent an alkyl group, and R 1 and R 2 may form a ring;

wherein R 5 -R 7 are the same or different and represent an alkyl group, and R 5 and R 6 may form a ring.

2. The non-aqueous electrolyte according to claim 1 , wherein the alkyl group has 1 to 6 carbon atoms.

3. The non-aqueous electrolyte according to claim 1 , further containing a non-aqueous organic solvent.

4. The non-aqueous electrolyte according to claim 3 , wherein the non-aqueous organic solvent contains at least one type selected from the group consisting of propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate.

5. A secondary battery comprising an anode, a non-aqueous liquid electrolyte and a cathode, wherein the non-aqueous liquid electrolyte is the non-aqueous liquid electrolyte according to claim 1 .

6. The secondary battery according to claim 5 , wherein the active material in the anode is at least one type of aluminum and aluminum alloy.

7. The secondary battery according to claim 5 , wherein the active material in the cathode is an oxide represented by the following general formula (3):

(Al x M 1-x ) 2 (M′O 4 ) 3   (3)

wherein M represents M 2 a M 3 b M 4 c , M 2 represents at least one type of bivalent metal element selected from Mg, Ca, Sr and Ba, M 3 represents at least one type of trivalent metal element selected from Sc, Y, Ga and In, M 4 represents at least one type of tetravalent metal element selected from Zr and Hf, M′ represents a hexavalent metal element including W or Mo, and 0≦a<1, 0≦b<1, c=a, 0<x≦1 and (2a/(1-x))+(3b/(1-x)) +(4c/(1-x))=3.