Gelion PLC on Thursday said it has achieved a milestone with its lithium-sulphur battery development, increasing its energy density by around 60%.

The London-based battery technology company said this was by fabricating a 395 watt-hour per kilogram lithium-sulphur 9.5 ampere-hour pouch cell in a commercial cell format.

Gelion said the energy density increase is compared with current lithium-ion batteries, which provide around 250 watt-hours per kilogram.

Further to its announcement last month, Gelion had produced 1.0 ampere-hour cells using the Oxis Gen2 cell technology that achieved energy density of 245 watt-hours per kilogram.

Gelion said that the latest achievement of 395 watt-hours per kilogram ‘aligns with the independent energy density modelling projections for a larger cell format’.

‘Achievement of this milestone represents a key technology proof point for Gelion. By re-establishing this performance, building on the Oxis Gen 2 technology and [intellectual property] acquired from Johnson Matthey. The company has set a new benchmark against which to compare upcoming ’next generation’ cell which targets further performance improvements upon this announced result,’ Gelion said.

Gelion said it would continue to progress developments in testing its ‘next-generation’ cell technology, alongside the silicon-sulphur cell technology.

It hopes to ‘unlock the potential’ of sulphur batteries for a wide range of global applications including electric vertical-takeoff-and-landing aircraft, drones, electric vehicles, and stationary energy storage.

This is because a high watt-hour per kilogram ‘translates to lighter batteries and opens many advantages for these markets’, Gelion said.

‘This result further validates Gelion’s Li-S technology plan. In 2023 we established a leading Li-S cell technology foundation following the acquisition of OXLiD and the IP acquired from Oxis and Johnson Matthey. Whilst these are still early results, we intend to build on them actively throughout 2024, unveiling and demonstrating the unique core proposition that Gelion is assembling,’ said Chief Executive Officer John Wood.

‘We continue to build on our position within the global battery industry and focus on establishing a strong identity and market presence which is centred on the key metrics of performance, cost, and safety, ready to leverage once our technologies go-to-market.’

Shares in Gelion were up 14% to 17.43 pence each in London on Thursday morning.

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