Patent US10777836 Energy Storage: Flow Batteries

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Cougar Creek Technologies, Llc

Patent US10777836

Issued 2020-09-15

Fe—cr Redox Flow Battery Systems Including A Balance Arrangement And Methods Of Manufacture And Operation

A system includes a redox flow battery system that includes an anolyte having chromium ions in solution, a catholyte having iron ions in solution, a first half-cell having a first electrode in contact with the anolyte, a second half-cell having a second electrode in contact with the catholyte, and a first separator separating the first half-cell from the second half-cell. The system also includes a balance arrangement that includes a balance electrolyte having vanadium ions in solution, a third half-cell having a third electrode in contact with the anolyte or the catholyte, a fourth half-cell having a fourth electrode in contact with the balance electrolyte, and a reductant in the balance electrolyte or introducible to the balance electrolyte for reducing dioxovanadium ions.

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1 Independent Claim

1. A system, comprising a redox flow battery system comprising an anolyte having chromium ions in solution, a catholyte having iron ions in solution, a first half-cell comprising a first electrode in contact with the anolyte, a second half-cell comprising a second electrode in contact with the catholyte, and a first separator separating the first half-cell from the second half-cell, and a balance arrangement comprising a balance electrolyte comprising vanadium ions in solution, a third half-cell comprising a third electrode in contact with the anolyte or the catholyte, a fourth half-cell comprising a fourth electrode in contact with the balance electrolyte, and a reductant in the balance electrolyte or introducible to the balance electrolyte for reducing dioxovanadium ions.