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As the global energy transition accelerates, the share of renewable energy sources such as wind power and photovoltaics in the Power System continues to increase. However, the intermittent and unstable nature of renewable energy generation increasingly poses challenges to grid balance and reliable operation. Lithium-ion batteries, the current mainstream energy storage solution, typically only provide 4-6 hours of energy storage and are costly, making them unable to meet multi-day energy storage needs (such as during extreme weather conditions with consecutive days of no wind and no sun). The power grid requires a new energy storage technology that can be adjusted across hours, days, and even seasons to ensure the stable integration of a high proportion of renewable energy.