Nonaqueous electrolyte secondary battery

1. A non-aqueous electrolyte secondary battery comprising a positive electrode plate, a negative electrode plate, and a non-aqueous electrolyte comprising a non-aqueous solvent and a solute dissolved in said non-aqueous solvent,

wherein said non-aqueous electrolyte further comprises a chain phosphoric acid ester and at least one imide salt represented by the formula (1):

where R 1 and R 2 each independently represent C n X 2+1 , X represents a hydrogen atom or halogen atom, and n is an integer equal to or greater than 1,

said chain phosphoric acid ester is at least one compound represented by the formula (2):

where R 3 , R 4 and R 5 each independently represent C m Y 2m+1 , C m Y 2m , C 6 H 5 or C m Y 2m+1 —C 6 H 4 , Y represents a hydrogen atom or halogen atom, and m is an integer from 1 to 8,

the amount of said chain phosphoric acid ester is 50 to 1000 ppm relative to the total weight of said non-aqueous electrolyte,

said imide salt in said non-aqueous electrolyte has a concentration of 0.1 to 0.5 mol/L, and

said positive electrode plate comprising an aluminum current collector.

2. The non-aqueous electrolyte secondary battery in accordance with claim 1 ,

wherein R 1 and R 2 in said formula (1) each independently represent C n X 2n+1 , where n is 1 to 6.

3. The non-aqueous electrolyte secondary battery in accordance with claim 1 ,

wherein the concentration of said imide salt in said non-aqueous electrolyte does not exceed the a concentration of said solute in terms of mol/L.