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China connects its largest battery-supercapacitor hybrid storage plant - Energy Storage (www.ess-news.com)

submitted 1 day ago by [email protected] to c/[email protected]

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China has connected to the grid a 100 MW hybrid energy storage facility that integrates supercapacitors and lithium-ion batteries

Touted as the world’s largest supercapacitor-based installation, the facility combines a 58 MW/30-second supercapacitor array with 42 MW/42 MWh of lithium-ion battery storage, spanning a footprint of approximately 16,800 square meters.

Supercapacitors provide ultrafast response times – specified at 0.001 seconds – and maintain over 85% capacity at –40°C, significantly outperforming lithium-ion batteries in extreme cold. By offloading rapid-response tasks to the supercapacitor, the system is expected to extend battery lifespan and reduce lifecycle costs by around 30%

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[-] [email protected] 5 points 1 day ago

Supercapacitors provide ultrafast response times – specified at 0.001 seconds – and maintain over 85% capacity at –40°C, significantly outperforming lithium-ion batteries in extreme cold.

Outperform how? At being a capacitor? That's their whole point.

On the energy side, 85% of 29 MW-min is 0.41 MWh. Even if the batteries lose 99% of their capacity at -40 °F, last I checked .42 MWh > 0.41 MWh.

These are two different tools for two different purposes, I'm not sure how you compare their "performance" under this metric.

[-] [email protected] 1 points 1 day ago

The caps also average charge fluctuating in the batteries, which should significantly enhance the cell lifespan.

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this post was submitted on 19 Sep 2025

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