TaiSan, a Cambridge-based battery startup developing solid-state sodium-ion cells, has raised £4.65 million in seed funding to move its technology closer to commercial use.

The round was co-led by Eos Advisory and the Midlands Engine Investment Fund II via Mercia Ventures, with participation from AFI Ventures, EverQuest Capital Partners, Adeline Arts & Science, Techmind, angel investor François Badelon, and existing backers InnoEnergy, TSP Ventures, Exergon and Heartfelt. Of the total, £700,000 came through Innovate UK’s Investor Partnerships Programme as grant funding matched to part of the private investment.

TaiSan says the new capital will be used to advance its battery technology, begin pilot tests with leading manufacturers, expand its Cambridge laboratory and establish operations in Coventry.

The company is developing sodium-ion batteries aimed at applications including e-bikes, scooters, vehicles and power tools, targeting a market looking for alternatives to lithium-based systems amid ongoing cost, supply chain and safety concerns.