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Low inner resistance manganese dioxide electrode for water system supercapacitor and preparation method thereof

A manganese dioxide electrode and supercapacitor technology, applied in the field of electronics, can solve problems such as production scale limitation, and achieve the effects of improving bonding strength, low equipment cost, and improving performance

Active Publication Date: 2012-07-04
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of the present invention can improve the performance of manganese dioxide, but its preparation process is the way of physical ball milling, and its production scale will be greatly limited

Method used

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  • Low inner resistance manganese dioxide electrode for water system supercapacitor and preparation method thereof
  • Low inner resistance manganese dioxide electrode for water system supercapacitor and preparation method thereof
  • Low inner resistance manganese dioxide electrode for water system supercapacitor and preparation method thereof

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preparation example Construction

[0060] The composition of the low internal resistance manganese dioxide electrode for water system supercapacitor of the present invention is calculated by weight fraction: A 二氧化锰 +B 乙炔黑 +C 碳纳米管 +D 聚四氟乙烯 = 100%, A 二氧化锰 +B 乙炔黑 +C 碳纳米管 = 95%, D 聚四氟乙烯 =5%, 2%≤B 乙炔黑 ≤15%, 2%≤C 碳纳米 管 ≤15%, 4%≤B 乙炔黑 +C 碳纳米管 ≤30%, the preparation method comprises the following steps: (1) preparing manganese dioxide powder; (2) mixing; (3) stirring; (4) coating; (5) rolling; (6) drying; (7) ) clipping.

[0061] Manganese dioxide powder is prepared: firstly, bulk manganese dioxide is prepared by electrochemical deposition, and then ultrafine manganese dioxide powder is obtained by ball milling.

[0062] The mixing process is as follows: put a certain proportion of manganese dioxide powder, acetylene black, and carbon nanotubes in a ball mill tank for mixing, wherein the ball milling speed is 50-200 rpm, and the ball milling time is 1-5 hours .

[0063] The mixing process is as follows: di...

Embodiment 1

[0070] 1. Preparation of manganese dioxide powder: first prepare massive manganese dioxide by electrochemical deposition, and then obtain ultrafine manganese dioxide powder by ball milling;

[0071] 2. Mixing: put manganese dioxide powder: acetylene black: carbon nanotubes in a ball milling tank at a ratio of 85:5:5 for ball milling and mixing. Ball milling parameters are: ball milling speed: 50 rpm, ball milling time: 5 hours;

[0072] 3. Stirring: Disperse polytetrafluoroethylene in deionized water, weigh an appropriate amount of mixed powder and disperse in it, mechanically stir while ultrasonically vibrating until the powder is evenly dispersed. Powder: polytetrafluoroethylene is stirred in a ratio of 95:5;

[0073] 4. Coating: The slurry is coated on the collector using an automatic continuous coating machine, with a coating width of 50mm and a thickness of 200um. The coating process can be dried by circulating hot air, and the temperature of the hot air is controlled at...

Embodiment 2

[0078] 1. Preparation of manganese dioxide powder: first prepare massive manganese dioxide by electrochemical deposition, and then obtain ultrafine manganese dioxide powder by ball milling;

[0079] 2. Mixing materials: put manganese dioxide powder: acetylene black: carbon nanotubes in a ball milling tank at a ratio of 75:10:10 for ball milling and mixing. The ball milling parameters are: ball milling speed 100 rpm, ball milling time 3 hours;

[0080] 3. Stirring: Disperse polytetrafluoroethylene in deionized water, weigh an appropriate amount of mixed powder and disperse in it, mechanically stir while ultrasonically vibrating until the powder is evenly dispersed. Powder: polytetrafluoroethylene is stirred in a ratio of 95:5;

[0081] 4. Coating: The slurry is coated on the current collector using an automatic continuous coating machine, with a coating width of 50mm and a thickness of 100um. The coating process can be dried by circulating hot air, and the temperature of the h...

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Abstract

The invention provides a low inner resistance manganese dioxide electrode for a water system supercapacitor and a preparation method thereof, solving the problem that inner resistance of a manganese dioxide electrode is high. The manganese dioxide electrode comprises the following components in parts by weight: 65-91 parts of manganese dioxide, 2-15 parts of acetylene black, 2-15 parts of carbon nano tube and 4-6 parts of polytetrafluoroethylene. The preparation method comprises mixing, stirring, coating, rolling, drying and cutting, wherein multiple variable-step rolling is adopted in the rolling process, the total compression amount is controlled in each rolling process, and the step is gradually reduced. The low inner resistance manganese dioxide electrode for the water system supercapacitor provided by the invention has the advantages of low inner resistance, good electrochemical stability, high specific capacitance and the like, has a work window with high specific energy sum in solution such as Na2SO4, K2SO4, Li2SO4 and the like and can be applied to a power supply occasion with high power density. By adopting the low inner resistance manganese dioxide electrode provided by the invention, production process is simple, production period is short, equipment cost is low, and industrialization is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of electronics, and relates to a supercapacitor, in particular to a low internal resistance manganese dioxide electrode for a water system supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device that combines the characteristics of traditional capacitors and batteries. It has the advantages of high energy density, high power density and good cycle life. According to different energy storage mechanisms, supercapacitors are mainly divided into two categories, one is the supercapacitor based on the interface electric double layer; the other is the supercapacitor based on the Faraday quasi-capacitance. [0003] The electrode materials currently used for supercapacitors mainly include: carbon materials, conductive polymer materials and metal oxide materials. Carbon materials are cheap, and their electrodes have high specific capacitance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/042
CPCY02E60/13
Inventor 马光叶志国韩钰陈新聂京凯
Owner CHINA ELECTRIC POWER RES INST
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