Stanford OnlineCourse Preview: Next-Generation Energy Storage
Stanford Online
How Redox Flow Batteries Work 0:00
Redox flow batteries use soluble redox molecules dissolved in liquid electrolyte, called anolyte and catholyte, which flow in and out of tanks. Tank size and solubility set the total energy, while a separate electrochemical stack sets the power, decoupling the two and potentially lowering cost.
Why Size Matters Less Here 1:32
Unlike mobile devices, stationary storage does not need high energy density, so larger tanks are fine as long as real estate costs stay reasonable.
Key Design Challenges 2:03
Solubility is often only about one molar, far below lithium systems, so raising it matters a lot. Redox molecules must stay stable through repeated cycling, and membranes must selectively pass only the balancing ion, since current ion-selective membranes remain expensive.
Common Redox Molecule Examples 4:30
Inorganic options include hydrogen, zinc, sulfur, iron, chromium, and vanadium, each with different potentials, paired to build complete battery cells.
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