Gelion PLC said on Wednesday that its Gen-3 lithium-sulfur technology has reached a milestone for lightweight energy storage, delivering an energy density above 400 watt-hours per kilogram.

The Anglo-American battery innovator said it had now successfully achieved the energy density milestone of 402 watt-hours per kilogram in a 12 ampere-hour cell comprised of Gelion’s Gen-3 semi-solid-state lithium-sulfur technology.

Gelion’s Gen-3 technology exhibits high energy density, avoids reactive additives, uses a cathode prepared from commercially available materials, and is fabricated using a non-toxic, water-based and low energy self-assembly process that can be adapted to existing gigafactory manufacturing equipment.

The achieved density is between 60% and 70% higher than current lithium-ion batteries, which deliver an energy density between approximately 200 and 250 watt-hours per kilogram. This means that a single Gelion Gen-3 lithium-sulfur cell is more than 60% lighter than a typical lithium-ion battery of the same energy.

Chief Executive Officer John Wood said: ‘We are thrilled to deliver on the expectation set out in our August update that our Gen-3 technology would deliver on the energy density milestone of 400 watt-hours per kilogram. This is significant and provides compelling evidence that our innovative Gen-3 approach to lithium-sulfur batteries has the potential to not only engineer batteries with excellent safety capabilities coupled with economical and sustainable manufacture, but also provides the exceptional energy for weight performance that makes lithium-sulfur batteries such an attractive technology.

Shares in Gelion fell 3.0% to 22.80 pence each in London on Wednesday afternoon.

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