From ESS News
In a milestone for lithium-free battery technology, the collaborative R&D project INNOBATT, led by the Fraunhofer Institute for Integrated Systems and Device Technology (IISB), has completed a battery system demonstrator based on aluminum-graphite-dual-ion batteries (AGDIB). The demonstrator confirms the stability of this new cell chemistry not only in laboratory conditions but also under realistic operational scenarios.
The rechargeable aluminum-ion battery is a cost-effective, non-flammable energy storage technology that uses easily obtainable active materials – aluminum and graphite. With natural graphite as the cathode material, AGDIB cells can achieve energy densities of 160 Wh/kg and power densities exceeding 9 kW/kg. As a high-power storage device, the aluminium ion batteries can be charged and discharged rapidly at high C-rates, enabling fast-response applications.
According to Fraunhofer IISB, the reversible chemistry allows over 10,000 cycles at 100 % depth of discharge (DoD) in laboratory test cells, with nearly 100 % Coulombic efficiency and energy efficiency above 85 %. The corrosion-resistant multi-layer pouch cells developed for aluminium ion batteries have capacities of up to 200 mAh, achieving more than 1,000 cycles for 4-layer 200 mAh cells at 6 C and over 7,000 cycles for single-layer 30 mAh cells at 30 C.
With such capabilities, aluminium-ion batteries show great potential for stationary and hybrid mobile applications, particularly as USP systems and high-performance storage devices for dynamic grid stabilization, where frequent low-energy micro-cycles demand high power rather than high energy density.
While many new lithium-free battery technologies remain at the lab scale, system-level demonstrators are rare. Within the INNOBATT project, a full battery system demonstrator has now been established after prior scaling of AGDIB technology to small-size pouch cells, Fraunhofer IISB reported in late November. Development focused on the entire value chain: sustainable lithium-free cell chemistry, integration of a wireless battery management system (BMS), bidirectional quantum-based current sensing, and recyclability.
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