氢锰液流电池性能和稳定性的系统研究.pdf

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1、A Systematic Study on the Performanceand Stability of Hydrogen-ManganeseFlow BatteryErlantz Villar1*,Rakel Wreland Lindstrm1,Amirreza Khataee11Applied Electrochemistry,KTH Royal Institute of Technology,Stockholm,SwedenEmail:erlantzkth.se Why Hydrogen-Manganese?2025-06-252E0=1.51 VE0=0 V2H+2e H2Mn2+M

2、n3+eChargeDischargeChargeDischargeAdvantages:High cell voltage of 1.51 VManganese is abundant and low-cost(2/kg Mn vs 12/kg V)Fast kinetics of the hydrogen reactionThe crossover can be collected on the anode side and pumped backChargeDischarge+-J.Rubio-Garcia,A.Kucernak,D.Zhao,D.Li,K.Fahy,V.Yufit,N.

3、Brandon,and M.Gomez-Gonzalez,Journal of Physics:Energy,1,015006(2018).Hydrogen-manganese challengeE0=1.51 VMn2+Mn3+eChargeDisproportionation reaction:2Mn3+2H2OMn2+MnO2(s)+4H+Challenges:Precipitation(Clogging)Mn3+loss(Capacity loss)Additive(TiO2+)Partial solutionoMnO2(s)smalleroCan be reducedoNo clog

4、gingDisproportionation still takes place2025-06-253Purpouse of the study2025-06-254 Particles in the bottom of the tank Suspension of particles in the electrolyteBefore cyclingAfter cyclingGoalsHow do operational parameters affect:o Performanceo DisproportionationMotivationCan we suppress disproport

5、ionationby optimizing operational parameters?o Voltage windowo Current densityo Rest timeEven with TiO2+Electrode is“damaged”Disproportionation must be controlled!Cutoff voltage effectUpper cutoff voltaje1.8 V:Lower VE&CEHigher capacity1.6 VHigher VE&CENo particles after dischargeLower cutoff voltaj

6、eSmall effect0.6 V slightly better1.8 V1.6 VVECEQDischarge(0.6 V vs 0.2 V&1.8 V vs 1.6 V)1.6 V 0.6 V optimalMnO2 Efficiency Lifetime 2025-06-255Current density effect Stable performance at 20-100 mA cm-2 Reversible reaction Some activation cycles needed at=100