Flow Batteries vs Lithium-Ion: Choosing the Right Tool for Long-Duration Storage

Lithium-ion dominates energy storage, so why do flow batteries keep coming up for long-duration needs? The answer is one structural difference in how each stores energy, and it decides which technology wins as discharge times lengthen.

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Flow battery electrolyte tanks beside lithium-ion battery containers at a grid storage site
Image: AI-generated illustration.

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