# US 8,771,381 B2 · Process for producing electrolytic capacitors and capacitors made thereby > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,381 B2 - Document ID: US8771381B2 - Status: Granted - Kind: B2 - Application number: 13/396,793 - Filed: 2012-02-15 - Published: 2012-08-16 - Granted: 2014-07-08 - Earliest claimed: 2011-02-15 - Assignees: Kemet Electronics Corporation - Applicants: Qingping Chen; Hong Zhang; Antony P. Chacko; Philip M. Lessner; Randolph S. Hahn; Yongjian Qiu; Keith R. Brenneman - Inventors: Qingping Chen; Hong Zhang; Antony P. Chacko; Philip M. Lessner; Randolph S. Hahn; Yongjian Qiu; Keith R. Brenneman - Web page: https://patentgrep.com/patent/US8771381B2 ## CPC - H01G 9/0032: {formation of the dielectric layer} - B05D 1/185: {applying monomolecular layers (B05D1/204 takes precedence)} - H01G 9/0036: {Formation of the solid electrolyte layer} - H01G 9/028: Organic semiconducting electrolytes, e.g. TCNQ - H01G 9/0425: {specially adapted for cathode} - H01G 9/052: Sintered electrodes - H01G 9/15: Solid electrolytic capacitors (H01G11/00 takes precedence) - B82Y 99/00: Subject matter not provided for in other groups of this subclass - Y10S 977/948: Energy storage/generating using nanostructure, e.g. fuel cell, battery - Y10T 29/43: Electric condenser making - H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A process for preparing a solid electrolytic capacitor comprising application of a non-ionic polyol prior to application of a conducting polymer layer. ## Claims ### Claim 1 A method of forming an electrolytic capacitor comprising: providing an anode with an anode lead extending therefrom; forming a dielectric on said anode; forming a conductive polymer layer on said layer of dielectric; forming a layer of non-ionic polyol on said conductive polymer layer; and forming a second conductive polymer layer on said layer of non-ionic polyol. ### Claim 2 (depends on 1) The method for forming an electrolytic capacitor of claim 1 comprising: forming a subsequent layer of non-ionic polyol. ### Claim 3 (depends on 2) The method of forming an electrolytic capacitor of claim 2 comprising forming a subsequent layer of conductive polymer on said subsequent layer of non-ionic polyol. ### Claim 4 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein said forming a conductive polymer layer on said layer of dielectric comprises in-situ polymerization. ### Claim 5 (depends on 1) The method for forming an electrolytic capacitor of claim 1 further comprising dipping in a slurry of conductive polymer prior to said forming a layer of non-ionic polyol. ### Claim 6 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein non-ionic polyol has a melting point of at least 50° C. to no more than 250° C. ### Claim 7 (depends on 6) The method for forming an electrolytic capacitor of claim 6 wherein non-ionic polyol has a melting point of at least 75° C. to no more than 200° C. ### Claim 8 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein said non-ionic polyol comprises an alkyl of 3-20 carbons with at least two carbons each comprising at least one hydroxyl group. ### Claim 9 (depends on 8) The method for forming an electrolytic capacitor of claim 8 wherein at least one carbon is substituted with an alkyl group. ### Claim 10 (depends on 9) The method for forming an electrolytic capacitor of claim 9 wherein said alkyl group has 1 to 5 carbons. ### Claim 11 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein said non-ionic polyol is selected from the group consisting of CH2OH(CHOH)2CH2OH, CH2OH(CHOH)3CH2OH, CH2OHC(CH2OH)2CH2OH, CH2OHC(CH3)2CH2OH, CH2OH(CHOH)4CH2OH, CH2OH(CHOH)4CH2OH, CH3C(CH2OH)3, O(CH2C(C2H5)CH2OH)2)2, CH2OH(CHOH)4COH, CH2OH(CHOH)3COCH2OH, sucrose and lactose. ### Claim 12 (depends on 1) The method for forming an electrolytic capacitor of claim 1 further comprising drying said conductive polymer layer. ### Claim 13 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein said anode comprises a valve metal. ### Claim 14 (depends on 13) The method for forming an electrolytic capacitor of claim 13 wherein said anode is selected from a group consisting of a valve metal and a conductive oxide of a valve metal. ### Claim 15 (depends on 13) The method for forming an electrolytic capacitor of claim 13 wherein said anode comprises a material selected from the group consisting of tantalum, aluminum, niobium and niobium oxide. ### Claim 16 (depends on 1) The method for forming an electrolytic capacitor of claim 1 wherein said conductive polymer is selected from the group consisting of polyaniline, polythiophene and polypyrole and their derivatives. ### Claim 17 (depends on 16) The method for forming an electrolytic capacitor of claim 16 wherein said conductive polymer is poly-3,4-ethylenedioxythiophene. ### Claim 18 (depends on 1) The method for forming an electrolytic capacitor of claim 1 further comprising forming a layer of nanoparticles on said conductive polymer layer. ### Claim 19 (depends on 18) The method for forming an electrolytic capacitor of claim 18 wherein said nanoparticles have an average particle size of no more than 100 nm. ### Claim 20 (depends on 19) The method for forming an electrolytic capacitor of claim 19 wherein said nanoparticles have an average particle size of no more than 50 nm. ### Claim 21 (depends on 18) The method for forming an electrolytic capacitor of claim 18 wherein said nanoparticles are selected from the group consisting of aluminum oxide, cerium oxide silicon oxide and zinc oxide.