Amine borate compound containing nonaqueous electrolytic solution and power storage device
View Patent ↗Provided is a nonaqueous electrolytic solution having an excellent capacity retention rate and an excellent output retention rate during cycles. The nonaqueous electrolytic solution includes a nonaqueous solvent; a hexafluorophosphate (A); a compound (B) represented by the following formula (1) in which an arbitrary hydrogen atom bonded to a carbon atom may be substituted with a fluorine atom; and at least one salt (C) selected from the group consisting of fluorophosphates other than the hexafluorophosphate (A), fluorosulfonates, imide salts represented by MN(SO 2 F) 2 , wherein M represents an alkali metal, and oxalate salts.
1. A nonaqueous electrolytic solution comprising:
a nonaqueous solvent;
a hexafluorophosphate (A);
a compound (B) represented by the following formula (1):
wherein an arbitrary hydrogen atom bonded to a carbon atom may be substituted with a fluorine atom; and
at least one salt (C) selected from the group consisting of fluorophosphates other than the hexafluorophosphate (A), fluorosulfonates, imide salts represented by MN(SO 2 F) 2 , wherein M represents an alkali metal, and oxalate salts.
2. The nonaqueous electrolytic solution according to claim 1 , wherein the content of the hexafluorophosphate (A) in the nonaqueous electrolytic solution is 0.5 mol/L or more and 3.0 mol/L or less.
3. The nonaqueous electrolytic solution according to claim 1 , wherein the content of the compound (B) is 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass in total of the nonaqueous solvent and the hexafluorophosphate (A) in the nonaqueous electrolytic solution.
4. The nonaqueous electrolytic solution according to claim 1 , wherein the content of the salt (C) is 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass in total of the nonaqueous solvent and the hexafluorophosphate (A) in the nonaqueous electrolytic solution.
5. The nonaqueous electrolytic solution according to claim 1 , wherein the salt (C) comprises at least one salt selected from the group consisting of LiPO 2 F 2 , FSO 3 Li, LiN(FSO 2 ) 2 , LiF 2 P(C 2 O 4 ) 2 and LiB(C 2 O 4 ) 2 .
6. The nonaqueous electrolytic solution according to claim 1 , wherein the hexafluorophosphate (A) comprises LiPF 6 salt.
7. A power storage device comprising a negative electrode, a positive electrode, and the nonaqueous electrolytic solution according to claim 1 .
8. A power storage device comprising a nonaqueous electrolytic solution, a positive electrode and a negative electrode,
wherein the nonaqueous electrolytic solution comprises a nonaqueous solvent and a compound represented by the following formula (1):
wherein an arbitrary hydrogen atom bonded to a carbon atom may be substituted with a fluorine atom; and
wherein the positive electrode comprises a composite oxide represented by the following formula (7):
A a Ni x Co y Mn z M′ b O 2 (7)
wherein, 0<a<1.2; x+y+z+b=1; 0<x<1; 0<y<1; 0<z<1; 0≤b<0.3; A is an alkali metal; and M′ is at least one selected from V, Fe, Cu, Nb, Mo, Ta, W, Zn, Ti, Zr, Al, Mg, Li, Na and K.
9. The power storage device according to claim 8 , wherein the content of the compound represented by the above formula (1) is 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the nonaqueous solvent.
10. The power storage device according to claim 8 , wherein the nonaqueous electrolytic solution comprises at least one salt selected from the group consisting of fluorophosphates, fluorosulfonates, imide salts and oxalate salts.
11. The power storage device according to claim 10 , wherein the content of the salt in the nonaqueous electrolytic solution is 0.001 mol/L or more and 3.0 mol/L or less.