Development of high-performance and cost-effective electrode assembly for redox flow batteries

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F25%3A43931864" target="_blank" >RIV/60461373:22340/25:43931864 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/25:43977854

Result on the web

<a href="https://doi.org/10.1016/j.rineng.2025.106285" target="_blank" >https://doi.org/10.1016/j.rineng.2025.106285</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.rineng.2025.106285" target="_blank" >10.1016/j.rineng.2025.106285</a>

Result language

angličtina

Original language name

Development of high-performance and cost-effective electrode assembly for redox flow batteries

Original language description

Redox flow batteries (RFBs) offer promising solutions for safe and durable stationary energy storage; however, high capital expenditures (CAPEX) hinder their commercialization. We developed a method for low-contact resistance welding of carbon-polymer composite plates to graphite felt electrodes and copper current collectors. Using our own extruded carbon-polymer composite plate with low carbon filling, we optimized two manufacturing methods: traditional hot-press and novel microwave welding. Electrode assembly samples were characterized by dry electric resistance measurements at compression ratios (CR) of 5–45 %, complex microstructural analysis via X-ray micro-computed tomography and scanning electron microscopy, and electrochemical characterization in a lab-scale vanadium RFB using voltammetry techniques, electrochemical impedance spectroscopy, and galvanostatic charge-discharge cycling both in a single-cell and two-cell stacks. Hot-press welding significantly improved overall battery performance by reducing contact resistance up to 2.5 times compared to non-welded assemblies. At 10 % CR, the performance of developed assemblies matched commercial unbonded materials at 20 % CR, using a carbon-polymer composite plate with higher conductive filler content. Achieved stack parameters included area-specific resistance of 2.1 Ω cm2 per cell and energy efficiency of 86.9 % at 40 mA cm–2. Developed electrode assemblies remained stable after 800 cycles. Microwave welding enabled faster production of electrode assemblies with similar performance to hot-press welded ones. The developed electrode assemblies, based on low-filled carbon-polymer composite plate may substantially reduce battery stack costs and assembly complexity, leading to lower levelized cost of storage and more reproducible RFB fabrication.

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

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OECD FORD branch

21100 - Other engineering and technologies

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2025

Confidentiality

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

Name of the periodical

Results in Engineering

ISSN

2590-1230

e-ISSN

2590-1230

Volume of the periodical

27

Issue of the periodical within the volume

September

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

15

Pages from-to

106285

UT code for WoS article

001554629500001

EID of the result in the Scopus database

2-s2.0-105010942467