Lithium ion capacitor and method for charging and discharging same
AssigneeSumitomo Electric Industries, Ltd.
InventorsKazuki OKUNO, Kenji TAKAHASHI, Masatoshi MAJIMA, Masashi ISHIKAWA
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Abstract
A lithium ion capacitor includes a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and a lithium ion conductive electrolyte. The electrolyte contains a lithium salt and an ionic liquid. The lithium salt is a salt of a lithium ion serving as a first cation and a first anion, and the ionic liquid is a molten salt of a second cation and a second anion. The first anion and the second anion are the same.
Claims9
A lithium ion capacitor comprising a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and a lithium ion conductive electrolyte,
- wherein the electrolyte contains a lithium salt and an ionic liquid,
- the lithium salt is a salt of a lithium ion serving as a first cation and a first anion, and the ionic liquid is a molten salt of a second cation and a second anion, and
- the first anion and the second anion are the same.
A method for charging and discharging a lithium ion capacitor,
- the lithium ion capacitor including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, a separator disposed between the positive electrode and the negative electrode, and a lithium ion conductive electrolyte,
- the electrolyte containing a lithium salt and an ionic liquid,
- the lithium salt being a salt of a lithium ion serving as a first cation and a first anion, and the ionic liquid being a molten salt of a second cation and a second anion, and
- the first anion and the second anion being the same,
- the method comprising a step of charging and discharging the lithium ion capacitor at an upper-limit voltage of more than 4.2 V and 5 V or less.
Dependencies are inferred from the claim text.