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US 10,947,376 B2Granted
Polyanion copolymers for use with conducting polymers in solid electrolytic capacitors
AssigneeKemet Electronics Corporation
InventorsAjaykumar Bunha, Antony P. Chacko, Yaru Shi, Qingping Chen, Philip M. Lessner
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Abstract
A capacitor and a method of making a capacitor, is provided with improved reliability performance. The capacitor comprises an anode; a dielectric on the anode; and a cathode on the dielectric wherein the cathode comprises a conductive polymer and a polyanion wherein the polyanion is a copolymer comprising groups A, B and C represented by Formula AxByCz as described herein.
Claims14
A slurry comprising:
- a conductive polymer;
- and
- a polyanion wherein said polyanion is a copolymer comprising groups A, B and C represented the ratio of Formula A:
- wherein:
- A is polystyrenesulfonic acid or salt of polystyrenesulfonate;
- B and C separately represent polymerized units substituted by a group selected from:
- —C(O)OR6 wherein R6 is selected from the group consisting of:
- —(CHR17)b—R18 wherein:
- R17 is selected from a hydrogen or an alkyl of 1 to 7 carbons;
- b is an integer from 1 to 10;
- and
- R18 is selected from the group consisting of phosphate, acrylate, hydroxyl, epoxy, thiol, alkene, alkyne, azide and anhydride;
- —(CHR7CH2O)b—R8 wherein:
- R7 is selected from a hydrogen or an alkyl of 1 to 7 carbons;
- b is an integer from 1 to the number sufficient to provide a molecular weight of up to 200,000 for the —CHR7CH2O— group;
- and
- R8 is selected from the group consisting of hydrogen, silane, phosphate, acrylate, an alkyl of 1 to 9 carbons optionally substituted with a functional group selected from the group consisting of hydroxyl carboxyl, amine, epoxy, silane, amide, phosphate, imide, thiol, alkene, alkyne, azide, acrylate and anhydride;
- —C(O)—NHR9 wherein:
- R9 is a hydrogen or an alkyl of 1 to 20 carbons optionally substituted with a functional group selected from the group consisting of hydroxyl, carboxyl, amine, epoxy, silane, amide, phosphate, imide, thiols, alkene, alkyne, azide, acrylate and anhydride;
- x, y and z, taken together are sufficient to form a polyanion with a molecular weight of at least 100 to no more than 500,000 and y/x is 0.01 to 100;
- z is 0 to a ratio z/x of no more than 100;
- and
- with the proviso that C is not same as B and z is not zero when B is substituted with a group selected from:
- C6H4—R10 wherein:
- R10 is hydrogen or an alkyl of 1-30 carbon.
22 more elements
A slurry comprising:
- a conductive polymer;
- and
- a polyanion wherein said polyanion is selected from the group consisting of:
- wherein each x, y and z, independently taken together for each said polyanion, are sufficient to form a polyanion with a molecular weight of at least 100 to no more than 500,000 and y/x is 0.01 to 100;
- z is 0 to a ratio z/x of no more than 100;
- and
- each b is independently an integer from 1 to 10.
4 more elements
Dependencies are inferred from the claim text.