Redox flow batteries having multiple electroactive elements
AssigneeBattelle Memorial Institute
InventorsWei Wang, Liyu Li, Zhenguo Yang, Zimin Nie
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Abstract
Introducing multiple redox reactions with a suitable voltage range can improve the energy density of redox flow battery (RFB) systems. One example includes RFB systems utilizing multiple redox pairs in the positive half cell, the negative half cell, or in both. Such RFB systems can have a negative electrolyte, a positive electrolyte, and a membrane between the negative electrolyte and the positive electrolyte, in which at least two electrochemically active elements exist in the negative electrolyte, the positive electrolyte, or both.
Claims15
A battery comprising:
- a redox flow battery (RFB) system having an aqueous-based negative electrolyte, an aqueous-based positive electrolyte, and a membrane between the negative electrolyte and the positive electrolyte, the system further comprising:
- at least two electrochemically active elements in the negative electrolyte, the positive electrolyte, or both, thereby employing at least two electrochemically active redox pairs, the at least two electrochemically active redox pairs being present in the RFB negative half cell, positive half cell, or both, during both charging and discharging of the RFB system, wherein the positive electrolyte comprises electrochemically active redox pair ions consisting of electrochemically active V redox ions and electrochemically active Fe redox ions.
A redox flow battery (RFB) system having:
- a membrane separating an aqueous-based negative electrolyte and an aqueous-based positive electrolyte, the positive electrolyte comprises electrochemically active redox pair ions V4+ and V5+ as well as electrochemically active redox pair ions Fe2+ and Fe3+, the negative electrolyte comprises electrochemically active redox pair ions consisting of electrochemically active redox pair ions V2+ and V3+;
- an operational voltage window having a lower limit not greater than 0.6 V and an upper limit not less than 1.5 V;
- and
- a volume of the negative electrolyte that is approximately twice that of the positive electrolyte, the RFB system thereby employing at least two electrochemically active redox pairs in the RFB positive half cell during charging and discharging of the RFB system.
Dependencies are inferred from the claim text.