Battery makers have long heated their materials to drive out every trace of water, assuming moisture is the enemy of battery chemistry. University of Surrey researchers tested that assumption on nanostructured sodium vanadate hydrate (NVOH) — and found it spectacularly wrong: leaving the water in place nearly doubled charge storage versus typical sodium-ion materials, sped up charging and stayed reliable for more than 400 cycles, putting it among the strongest cathodes reported for this battery type. That matters because sodium is abundant in seawater and minerals, while lithium is costly and environmentally heavy — performance was always sodium's weak point.

The material also kept working in salt water, drawing sodium ions to itself while a graphite electrode removed chloride — electrochemical desalination. "Our results were completely unexpected," said lead author Dr. Daniel Commandeur. Future devices could store solar or wind power while turning seawater into fresh water, a double benefit for coastal regions. The research, published in the Journal of Materials Chemistry A, is early-stage; more testing is needed before commercial batteries or desalination systems.

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