Lithium secondary battery electrolytic solution and secondary battery including said electrolytic solution
A new electrolytic solution system for lithium secondary batteries. Provided is a lithium secondary battery electrolytic solution containing a nonaqueous solvent and a lithium salt. The nonaqueous solvent is mixed at an amount of not more than 3 mol with respect to 1 mol of the lithium salt.
1. A secondary battery comprising: a positive electrode including a positive electrode active material; a negative electrode including a negative electrode active material capable of occluding and releasing lithium ions; and an electrolytic solution for lithium secondary batteries
wherein the electrolytic solution comprising a nonaqueous solvent and a lithium salt, wherein the nonaqueous solvent is mixed at an amount of not more than 3 mol with respect to 1 mol of the lithium salt; and
the positive electrode active material is oxygen; and
the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, y-butyrolactone, or sulfolane.
2. The secondary battery according to claim 1 , wherein the nonaqueous solvent is mixed at an amount of not less than 1 mol but not more than 3 mol with respect to 1 mol of the lithium salt.
3. The secondary battery according to claim 2 , wherein the nonaqueous solvent is mixed at an amount of not less than 1.5 mol but not more than 2.5 mol with respect to 1 mol of the lithium salt.
4. The secondary battery according to claim 1 , wherein the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ).
5. The secondary battery according to claim 1 , wherein the nonaqueous solvent is an aprotic solvent.
6. The secondary battery according to claim 1 , wherein the negative electrode active material is a carbon material.
7. The secondary battery according to claim 6 , wherein the carbon material is graphite.
8. The secondary battery according to claim 1 , wherein the negative electrode active material is metal lithium or a lithium alloy.
9. The secondary battery according to claim 1 , wherein the negative electrode active material is a carbon material; and the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, γ-butyrolactone, or sulfolane.
10. The secondary battery according to claim 1 , wherein the negative electrode active material is a carbon material; and the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ).
11. The secondary battery according to claim 1 , wherein the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ); and the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, γ-butyrolactone, or sulfolane.
12. The secondary battery according to claim 1 , wherein the negative electrode active material is a carbon material; the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, γ-butyrolactone, or sulfolane; and the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ).
13. The secondary battery according to claim 12 , wherein the carbon material is graphite.
14. The secondary battery according to claim 1 , wherein the negative electrode active material is a metal lithium or a lithium alloy; and the nonaqueous solvent is acetonitrile, tetrahydrofuran, dimethyl sulfoxide, γ-butyrolactone, or sulfolane.
15. The secondary battery according to claim 1 , wherein the negative electrode active material is a metal lithium or a lithium alloy; and the lithium salt is lithium bis(trifluoromethanesulfonyl)amide (Li[N(CF 3 SO 2 ) 2 ]), lithium bis(perfluoroethylsulfonyl)amide (Li[N(C 2 F 5 SO 2 ) 2 ]), or lithium bis(fluorosulfonyl)amide (LiN(SO 2 F) 2 ).