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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/49777513:23640/25:43977854

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

21100 - Other engineering and technologies

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Results in Engineering

ISSN

2590-1230

e-ISSN

2590-1230

Svazek periodika

27

Číslo periodika v rámci svazku

September

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

15

Strana od-do

106285

Kód UT WoS článku

001554629500001

EID výsledku v databázi Scopus

2-s2.0-105010942467