Vanadium Redox Flow Battery
SECONDARY BATTERIES – FLOW SYSTEMS Overview
los ntawm MJ Watt-Smith, … FC Walsh, hauv Encyclopedia ntawm Electrochemical Power Sources
Lub vanadium-vanadium redox flow roj teeb (VRB)tau pioneer los ntawm M. Skyllas-Kazacos thiab cov neeg ua hauj lwm hauv 1983 hauv University of New South Wales, Australia. Lub tshuab tam sim no tau tsim los ntawm ntau lub koom haum suav nrog E-Fuel Technology Ltd hauv tebchaws United Kingdom thiab VRB Power Systems Inc. hauv Canada. Ib qho tshwj xeeb ntawm VRB yog tias nws ua haujlwm tib yam tshuaj hauv ob qho tib sianode thiab cathode electrolytes. VRB siv plaub lub xeev oxidation ntawm vanadium, thiab qhov zoo tshaj plaws muaj ib qho redox ob peb ntawm vanadium hauv txhua ib nrab ntawm tes. Cov khub niam txiv V(II)–(III) thiab V(IV)–(V) yog siv nyob rau hauv qhov tsis zoo thiab zoo ib nrab-hlwb, feem. Feem ntau, kev txhawb nqa electrolyte yog sulfuric acid (∼2-4 mol dm-3) thiab vanadium concentration yog nyob rau hauv thaj tsam ntawm 1-2 mol dm-3.
Cov kev tawm tsam them-tso tawm hauv VRB tau pom hauv cov tshuaj tiv thaiv [I]–[III]. Thaum lub sijhawm ua haujlwm, qhov qhib-circuit voltage feem ntau yog 1.4 V ntawm 50% lub xeev-ntawm-tus nqi thiab 1.6 V ntawm 100% lub xeev-ntawm-tus nqi. Cov electrodes siv hauv VRBs feem ntau yogcarbon hlaulos yog lwm yam ntxeem tau, peb-dimensional daim ntawv ntawm carbon. Cov roj teeb ntawm lub zog qis dua tau ua haujlwm carbon-polymer composite electrodes.
Ib qho txiaj ntsig tseem ceeb ntawm VRB yog tias kev siv tib lub ntsiab lus hauv ob lub cev ib nrab pab kom tsis txhob muaj teeb meem cuam tshuam nrog kev sib kis ntawm ob nrab ntawm tes electrolytes thaum siv mus ntev. Cov electrolyte muaj lub neej ntev thiab cov teeb meem pov tseg tau raug txo kom tsawg. VRB kuj tseem muaj kev ua haujlwm siab zog (<90% hauv kev teeb tsa loj), tus nqi qis rau lub peev xwm loj, kev kho dua tshiab ntawm cov tshuab uas twb muaj lawm, thiab lub neej voj voog ntev. Cov kev txwv muaj peev xwm suav nrog tus nqi peev ntawm vanadium-raws li electrolytes nrog rau cov nqi thiab kev txwv lub neej ntawm cov ion pauv membrane.
Post lub sij hawm: May-31-2021