Nonaqueous electrolyte secondary battery
AssigneeSeiko Instruments Inc.
InventorKen Miura
Life of this patent
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Abstract
A nonaqueous electrolyte secondary battery is provided, including: a positive electrode (10) that includes a lithium-manganese oxide as a positive electrode active material; a negative electrode (20) that includes SiOX (0≤X<2) in which at least a part of a surface is covered with carbon, or a Li—Al alloy as the negative electrode active material; and an electrolytic solution (50) that contains propylene carbonate (PC), ethylene carbonate (EC), and dimethoxy ethane (DME) as an organic solvent in a range of {PC:EC:DME}={0.5 to 1.5:0.5 to 1.5:1 to 3} in terms of a volume ratio, and at least one of lithium bis(fluorosulfonyl)imide (LiFSI) and lithium bis(trifluoromethane sulfonyl) imide (LiTFSI) as a supporting salt in a total amount of 0.6 to 1.4 (mol/L).
Claims4
A nonaqueous electrolyte secondary battery, comprising:
- a positive electrode that includes a lithium-manganese oxide as a positive electrode active material;
- a negative electrode that includes SiOX (0≤X<2) in which at least a part of a surface is covered with carbon, or a Li—Al alloy as a negative electrode active material;
- and
- a low viscosity electrolytic solution that contains propylene carbonate (PC), ethylene carbonate (EC), and dimethoxy ethane (DME) as an organic solvent in a range of {PC:EC:DME}={0.5 to 1.5:0.5 to 1.5:1 to 3} in terms of a volume ratio, and lithium bis(fluorosulfonyl)imide (LiFSI) as a supporting salt in an individual amount of 0.6 to 1.2 (mol/L), where a viscosity of the electrolytic solution is constant at −30° C. to −40° C.
Dependencies are inferred from the claim text.