Supercapacitor degradation assesment by power cycling and calendar life tests

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F16%3APU119952" target="_blank" >RIV/00216305:26220/16:PU119952 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1515/mms-2016-0038" target="_blank" >http://dx.doi.org/10.1515/mms-2016-0038</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1515/mms-2016-0038" target="_blank" >10.1515/mms-2016-0038</a>

Result language

angličtina

Original language name

Supercapacitor degradation assesment by power cycling and calendar life tests

Original language description

Degradation of Supercapacitors (SC) is quantified by accelerated ageing tests. Energy cycling tests and calendar life tests are used since they address the real operating modes. The periodic characterization is used to analyse evolution of the SC parameters as a whole, and its Helmholtz and diffusion capacitances. These parameters are determined before the ageing tests and during 3 x 105 cycles of both 75% and 100% energy cycling, respectively. Precise evaluation of the capacitance and Equivalent Series Resistance (ESR) is based on fitting the experimental data by an exponential function of voltage vs. time. The ESR increases linearly with the number (No) of cycles for both 75% and 100% energy cycling, whereas a super-linear increase of ESR vs. time of cycling is observed for the 100% energy cycling. A decrease of capacitance in time had been evaluated for 2000 hours of ageing of SC. A relative change of capacitance is ΔC/C0 = 16% for the 75% energy cycling test and ΔC/C0 = 20% for the 100% energy cycling test at temperature 25°C, while ΔC/C0 = 6% for the calendar test at temperature 22°C for a voltage bias V = 1.0 Vop. The energy cycling causes a greater decrease of capacitance in comparison with the calendar test; such results may be a consequence of increasing the temperature due to the Joule heat created in the SC structure. The charge/discharge current value is the same for both 75% and 100% energy cycling tests, so it is the Joule heat created on both the equivalent series resistance and time-dependent diffuse resistance that should be the source of degradation of the SC structure. The diffuse resistance reaches a value of up to 30 Ω within each 75% energy cycle and up to about 43 Ω within each 100% energy cycle.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20201 - Electrical and electronic engineering

Project

<a href="/en/project/LQ1601" target="_blank" >LQ1601: CEITEC 2020</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

METROL MEAS SYST

ISSN

0860-8229

e-ISSN

2300-1941

Volume of the periodical

23

Issue of the periodical within the volume

3

Country of publishing house

PL - POLAND

Number of pages

14

Pages from-to

345-358

UT code for WoS article

000382041400003

EID of the result in the Scopus database

2-s2.0-84979289480