Electrolytic capacitor
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsYuichiro TSUBAKI, Tatsuji AOYAMA, Kazuyo SAITO, Yuji OTSUKA
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Abstract
An electrolytic capacitor includes a capacitor element and an electrolytic solution. The capacitor element includes: an anode body including a dielectric layer; a cathode body; and a solid electrolyte in contact with the dielectric layer. The electrolytic solution includes a solvent, a solute, and a polymer component. The solvent includes an ethylene glycol compound. The polymer component includes polyalkylene glycol. The polyalkylene glycol includes at least one of (i) a mixture of polyoxyethylene and polyoxypropylene and (ii) an oxyethylene-oxypropylene copolymer. In the polyalkylene glycol, a molar ratio m/n of oxyethylene units to oxypropylene units is greater than 1.
Claims7
An electrolytic capacitor comprising a capacitor element and an electrolytic solution, the capacitor element including:
- an anode body including a dielectric layer;
- a cathode body;
- and a solid electrolyte in contact with the dielectric layer, wherein:
- the electrolytic solution includes a solvent, a solute, and a polymer component,
- the solvent includes an ethylene glycol compound,
- the polymer component includes polyalkylene glycol,
- the polyalkylene glycol includes an oxyethylene-oxypropylene copolymer,
- a molar ratio m/n of oxyethylene units to oxypropylene units in the polyalkylene glycol is greater than 1 and less than or equal to 5, and
- a number-average molecular weight of the oxyethylene-oxypropylene copolymer ranges from 1,000 to 5,000, inclusive.
Dependencies are inferred from the claim text.