Non-aqueous electrolyte secondary battery
View Patent ↗A non-aqueous electrolyte secondary battery according to the present invention is characterized by including a non-aqueous electrolyte which contains at least one of vinylene carbonate derivatives at a concentration of 1 wt % or less and at least one of cyclic sulfates at a concentration of 2 wt % or less. According to the present invention, a non-aqueous electrolyte secondary battery having excellent discharge characteristics at a low temperature can be obtained.
1. A non-aqueous electrolyte secondary battery comprising a non-aqueous electrolyte which contains at least one of vinylene carbonate derivatives represented by Chemical Formula 1 at a concentration of 0.25 to 1 wt % and at least one of cyclic sulfates represented by Chemical Formula 2 at a concentration of 0.25 to 2 wt %, wherein said concentrations are expressed with ratios to a total amount of said non-aqueous electrolyte, wherein each of R1 to R8 is any one of a hydrogen atom, alkyl groups, alkoxy groups, halogens, haloalkyl groups, and aryl groups and n is 0 or 1, wherein Chemical Formula 1 is:
and Chemical Formula 2 is:
2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said non-aqueous electrolyte comprises ethylene carbonate.
3. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said vinylene carbonate derivative is vinylene carbonate.
4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said cyclic sulfate of Chemical Formula 2 is ethylene glycol cyclic sulfate.
5. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said cyclic sulfate of Chemical Formula 2 is 1,2-propanediol cyclic sulfate.
6. The non-aqueous electrolyte secondary battery according to claim 1 , principally comprising a carbonaceous material as a negative active material.
7. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said non-aqueous electrolyte comprises LiPF 6 .
8. The non-aqueous electrolyte secondary battery according to claim 1 , wherein said non-aqueous electrolyte comprises a chain carbonate.
9. A method for producing a non-aqueous electrolyte secondary battery, wherein an electrode is brought into contact with a non-aqueous electrolyte which contains at least one of vinylene carbonate derivatives represented by Chemical Formula 1 at a concentration of 0.25 to 1 wt % and at least one of cyclic sulfates represented by Chemical Formula 2 at a concentration of 0.25 to 2 wt %, at least at a certain time during a period from when the electrolyte is initially brought into contact with the electrode to when the electrolyte can not be added because the battery case is completely sealed, wherein said concentrations are expressed with ratios to a total amount of said non-aqueous electrolyte, wherein each of R1 to R8 is any one of a hydrogen atom, alkyl groups, alkoxy groups, halogens, haloalkyl groups, and aryl groups and n is 0 or 1, wherein Chemical Formula 1 is:
and Chemical Formula 2 is:
10. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said non-aqueous electrolyte comprises ethylene carbonate.
11. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said vinylene carbonate derivative is vinylene carbonate.
12. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said cyclic sulfate of Chemical Formula 2 is ethylene glycol cyclic sulfate.
13. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said cyclic sulfate of Chemical Formula 2 is 1,2-propanediol cyclic sulfate.
14. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said non-aqueous electrolyte secondary battery principally comprises a carbonaceous material as a negative active material.
15. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said non-aqueous electrolyte comprises LiPF 6 .
16. The method for producing a non-aqueous electrolyte secondary battery according to claim 9 , wherein said non-aqueous electrolyte comprises a chain carbonate.