Modelling specific capacitance of D.C. etched aluminium foil for aluminium electrolytic capacitor

Zhu, Shuqin; Ban, Chaolei; Tao, Xuquan; Chen, W. Y.; Jiang, Luxia

doi:10.1007/s10854-015-3280-0

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…Peng et al further established row-merged and cluster-merged model models on the basis of cylindrical model and the maximum of specific capacitance and the corresponding optimum values for tunnel sizes at different anodization voltages were predicted (Peng et al, 2014). In our former work, a cubic tunnel etch model and a trench etch model were explored in detail (Zhu et al, 2015b). However, little attention was paid to the cubic tunnel model with branches.…”

Section: Introductionmentioning

confidence: 97%

D.C. etching anode aluminum foil to form branch tunnels by electroless depositing Cu

Liu

Wang

Chen

et al. 2019

ACMM

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Purpose The purpose of this study is to explore the mechanism of branch pits and tunnels formation and increase the specific surface area and capacitance of anode Al foil for high voltage electrolytic capacitor by D.C. etching in acidic solution and neutral. Design/methodology/approach Al foil was first D.C. etched in HCl-H2SO4 mixed acidic solution to form main tunnels perpendicular to the Al surface, and then D.C. etched in neutral NaCl solution including 0.5 per cent C6H8O7 and Cu(NO3)2 with different concentration to form branch tunnels normal to Al surface. Between two etching, Cu nuclei were electroless deposited on the interior surface of main tunnels by natural occluded corrosion cell effect to form micro Cu-Al galvanic local cells. The effects of electroless deposited Cu nuclei on cross-section etching morphologies and electrochemical behavior of Al foil was investigated with SEM, polarization curve and electrochemical impedance spectroscopy (EIS). Findings The results show that sub branch tunnels can form along the main tunnels owing to the formation of Cu-Al micro-batteries, in which Cu is cathode and Al is anode. With increase in Cu(NO3)2 concentration, more Cu nuclei can be electroless deposited and serve as the favorable sites for branch tunnel initiation along the whole length of main tunnels, leading to enhancement in specific capacitance of anode Al foil. Originality/value Cu nuclei were electroless deposited on the interior surface of main tunnels by natural occluded corrosion cell effect to form micro Cu-Al galvanic local cells, which can serve as the favorable sites for branch tunnel initiation along the main tunnels to enhance specific capacitance of anode Al foil.

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Section: Introductionmentioning

confidence: 97%

D.C. etching anode aluminum foil to form branch tunnels by electroless depositing Cu

Liu

Wang

Chen

et al. 2019

ACMM

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“…The tunnels in aluminum foils are typically 1–2 μm wide, 40–50 μm long, and present at a density on the order of 10 7 cm −2. 2 The average length of tunnels determines the capacity of the anodic electrode. In addition to this method, scholars have prepared branch tunnels for capacity enhancement by depositing impurity elements 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Effects of the solution flow rate on the growth of aluminum etch tunnels

You

Chen

et al. 2022

Engineering Reports

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Increasing the specific surface area of the anode foil of aluminum electrolytic capacitors is a research direction to improve the performance of capacitors. Industrial mass‐produced anode foil increases the specific surface area by electrochemical etching of the aluminum foil. However, the tunnels created by corrosion stop growing midway through this process. In this study, the effect of the solution flow rate on tunnel growth is investigated, and the growth of tunnels is analyzed using a new method of preparing oblique sections. Neater tunnels can be grown by increasing the solution flow rate to facilitate active tunnels.

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“…As the key material of aluminum electrolytic capacitors, cube texture volume fraction of the electrolytic capacitor aluminum foil has a great influence on its electrical properties. So it needs enough strong cube texture [1][2][3][4][5][6]. In order to meet the needs of electronic aluminum foil production, it is necessary to adjust and control the product process better, to increase the {100} cube texture proportion of the electronic aluminum foil [7,8].…”

Section: Introductionmentioning

confidence: 99%

Texture Detection of Aluminum Foil Based on Top‐Hat Transformation and Connected Region Segmentation

Wang

2020

Advances in Materials Science and Engineering

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A new method of texture detection for aluminum foil based on digital image processing technology is proposed. Top-hat transformation and image segmentation technology based on the connected domain are used to change the method of determining texture fraction by using human experience. Compared with the brightness method, pit detection method, and EBSD technology, this method can complete quantitative detection efficiently, automatically, and accurately, and reduce the detection time and manpower. It eliminates the instability of manual detection and ensures the accuracy of detection. By this method, the error of test results can be controlled within 1.6%, which is much better than 7.3% of the brightness method and 4% of the pitting method. It provides more accurate test results for the production process control of aluminum foil.

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Modelling specific capacitance of D.C. etched aluminium foil for aluminium electrolytic capacitor

Cited by 12 publications

References 18 publications

D.C. etching anode aluminum foil to form branch tunnels by electroless depositing Cu

D.C. etching anode aluminum foil to form branch tunnels by electroless depositing Cu

Effects of the solution flow rate on the growth of aluminum etch tunnels

Texture Detection of Aluminum Foil Based on Top‐Hat Transformation and Connected Region Segmentation

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