Capacitor
First Claim
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1. A capacitor comprising:
- a positive electrode composed of a polarizable electrode containing activated carbon;
a negative electrode containing as an anode active material a carbon material capable of inserting or extracting lithium ion; and
a nonaqueous electrolyte containing lithium ion, wherein a charge cutoff potential for said negative electrode is within a range of approximately 0.15 to 0.25 V (vs. Li/Li+).
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Abstract
The present invention is characterized by obtaining a high charge/discharge capacity upon high rate charging/discharging in a hybrid capacitor having characteristics of both an electric double layer capacitor and a lithium-ion secondary battery. Specifically, the present invention is a capacitor comprising: a positive electrode 1 composed of a polarizable electrode containing activated carbon; a negative electrode 2 containing as an anode active material a carbon material capable of inserting/extracting lithium ion; and a nonaqueous electrolyte containing lithium ion, wherein a charge cutoff potential for the negative electrode 2 is within the range of 0.15 to 0.25 V (vs. Li/Li+).
79 Citations
21 Claims
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1. A capacitor comprising:
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a positive electrode composed of a polarizable electrode containing activated carbon; a negative electrode containing as an anode active material a carbon material capable of inserting or extracting lithium ion; and a nonaqueous electrolyte containing lithium ion, wherein a charge cutoff potential for said negative electrode is within a range of approximately 0.15 to 0.25 V (vs. Li/Li+). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for manufacturing a capacitor including a positive electrode composed of a polarizable electrode containing activated carbon, a negative electrode containing a carbon material and a nonaqueous electrolyte containing lithium ion, the method comprising the steps of:
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immersing the negative electrode and lithium metal in an electrolyte, the negative electrode and the lithium metal being brought into contact with each other; and applying heat to the negative electrode and the lithium metal having been immersed in the electrolyte before assembly of the capacitor. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for manufacturing a capacitor including a positive electrode composed of a polarizable electrode containing activated carbon, a negative electrode containing a carbon material, and a nonaqueous electrolyte containing lithium ion, the method comprising the steps of:
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making the negative electrode and lithium metal face to each other via a separator; and providing a constant current charge between the negative electrode and the lithium metal in an electrolyte before assembly of the capacitor. - View Dependent Claims (18, 19, 20, 21)
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Specification