Nonaqueous electrolyte secondary battery including lithium fluorosulfonate
Provided is a nonaqueous electrolyte secondary battery in which lithium fluorosulfonate is added to a nonaqueous electrolytic solution and which demonstrates excellent low-temperature performance. The nonaqueous electrolyte secondary battery disclosed herein includes a positive electrode, a negative electrode, and a nonaqueous electrolytic solution. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes, as a positive electrode active material, a lithium transition metal composite oxide including at least lithium, nickel, manganese, and cobalt. The nonaqueous electrolytic solution includes lithium fluorosulfonate. A dibutyl phthalate absorption amount of the positive electrode active material is 28 mL/100 g or more and 45 mL/100 g or less. A content of lithium fluorosulfonate in the nonaqueous electrolytic solution is 0.15% by mass or more and 1.0% by mass or less.
1. A nonaqueous electrolyte secondary battery comprising:
a positive electrode;
a negative electrode; and
a nonaqueous electrolytic solution, wherein
the positive electrode includes a positive electrode active material layer,
the positive electrode active material layer includes, as a positive electrode active material, hollow particles having a shell portion composed of a lithium-nickel-manganese-cobalt-based composite oxide having a layered rock salt type structure, a hollow portion formed inside the shell portion, and a through hole penetrating the shell portion,
the nonaqueous electrolytic solution includes lithium fluorosulfonate,
a dibutyl phthalate absorption amount of the positive electrode active material is 28 mL/100 g or more and 45 mL/100 g or less, and
a content of lithium fluorosulfonate in the nonaqueous electrolytic solution is 0.15% by mass or more and 1.0% by mass or less.
2. The nonaqueous electrolyte secondary battery according to claim 1 , wherein a content of nickel with respect to a total content of nickel, manganese, and cobalt in the lithium-nickel-manganese-cobalt-based composite oxide is 34 mol % or more.
3. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the nonaqueous electrolytic solution further includes lithium bis(oxalato)borate.
4. The nonaqueous electrolyte secondary battery according to claim 3 , wherein a content of lithium bis(oxalato)borate in the nonaqueous electrolytic solution is 0.1% by mass or more.
5. The nonaqueous electrolyte secondary battery according to claim 3 , wherein a content of lithium bis(oxalato)borate in the nonaqueous electrolytic solution is 0.5% by mass or more.
6. The nonaqueous electrolyte secondary battery according to claim 1 , wherein the nonaqueous electrolytic solution further includes lithium difluorophosphate.
7. The nonaqueous electrolyte secondary battery according to claim 6 , wherein a content of lithium difluorophosphate in the nonaqueous electrolytic solution is 0.1% by mass or more.
8. The nonaqueous electrolyte secondary battery according to claim 6 , wherein a content of lithium difluorophosphate in the nonaqueous electrolytic solution is 0.5% by mass or more.