GMG Doubles Energy Density of 6 Minute Charging Graphene Aluminium-Ion Battery
BRISBANE, AUS, Apr 15, 2026 – (ACN Newswire) – Graphene Manufacturing Group Ltd. (TSXV: GMG) (OTCQX: GMGMF) (“GMG” or the “Company“) is pleased to provide the latest progress update on the Graphene Aluminium-Ion Battery technology (“G+A CELLS“) being developed by GMG and the University of Queensland (“UQ“) under a Joint Development Agreement with Rio Tinto, one of the world’s largest metals and mining groups, and with the support of the Battery Innovation Center of Indiana (“BIC”) in the United States of America.
The GMG G+A CELLS have now demonstrated superior performance characteristics when compared to a representative market leading ultra-fast charging batteries, the Lithium Titanate Oxide (“LTO”) batteries, which can be sold at a premium price of up to US$1200/kWh.1
Figure 1 shows the current energy density of G+A CELLS, based on BIC testing, and shows the doubling in performance (26 to 49 Wh/kg) since the previous announcement in December 20252 and in comparison, to a representative market leading fast charging high power LTO batteries.
Figure 2 shows the charge and discharge curves for the G+A CELLS when charged in 6 minutes (10C) and 60 minutes (1C). The energy density of the cells for the G+A CELLS when charged in 60 minutes (1C) is now 101 Wh/kg when charging to 100% State of Charge (SOC) which is an increase from 58 Wh/kg from the previous update. This shows the G+A CELLS have a nominal voltage of approximately 3.2 Volts (an increase from 3.0 Volts in the previous update). The G+A CELLS maintained performance over hundreds of cycles at 6-minute fast charging rate (10C).
Bob Galyen, GMG Non-Executive Director and former CTO of CATL – the largest battery manufacturer in the world, commented:
With the possibility of charging from empty to full in around six minutes, this chemistry fundamentally changes how designers can think about electric vehicles, consumer electronics, and stationary storage.
” Instead of planning around long charge stops with large packs, engineers can optimise for rapid energy turnaround, with higher power, and safer, with GMG’s battery made from abundant raw materials. Lithium-ion will remain a key part of the energy landscape for years to come, but its limitations in fast charging, temperature tolerance, and critical-mineral supply are increasingly evident. By leveraging aluminium and graphene, the GMG team is demonstrating a pathway to reduce reliance on traditional lithium-based systems and or combinatorial systems with multiple battery technologies while delivering step-change improvements in charge time and power density. This is not an incremental tweak to existing cells – it is a new platform that can open markets and use cases that were previously uneconomic or impractical. The companies that adapt quickest to this shift will lead the next wave of electrification, and GMG intends to be at the centre of that transition with graphene aluminium-ion technology.”
Standard commercial Lithium Nickel Manganese Cobalt (“LNMC”) and Lithium Iron Phosphate (“LFP”) battery cells for electric vehicles and stationary storage are NOT designed for continuous 6-minute charging (10C); typical recommended charge rates are ≤1 hour (1C), often 2 hours (0.5C), with only limited fast charge operation. Only specialized high-power cell designs like LTO battery cells can tolerate charge rates of 6 minutes (10C).3
GMG has now developed a completely new hybrid electrolyte that is chloride free and non-corrosive, unlike common aluminium battery electrolytes, along with a complex cathode and anode technology that enables very stable fast charging over hundreds of cycles. The substrate for both the cathode and anode in the G+A CELLS is aluminium foil – which provides significant cost and weight savings compared with copper, the substrate material used in most lithium and sodium-ion batteries. GMG’s technology does not include the use of lithium or copper. The Company has submitted an additional patent application covering these new developments.
GMG believes that it has significantly met the key target specification requirements for use in heavy mobile equipment, as shown in Figure 3, its main targeted use case, including:
– Charging in under 6 minutes;
– Energy density > 100 Wh/kg after 1 hour of charging; and
– Safe (no Lithium).
The next battery development steps include the following activities:
– Test and show cycle life up to 10,000 cycles
– Test and show ambient temperature impacts
– Test and show standard safety testing
– Test and show no thermal battery management system needed
Craig Nicol, GMG Managing Director and CEO, commented:
This is a significant step up from where we were at with battery performance in December 2025 and we see the required performance for our targeted use case being largely met – which means we can start to put together the next stages of the battery maturation program – including partnerships and manufacturing plans.
GMG management believes that the G+A CELLS can eventually achieve over 160 Wh/kg when charged in 1 hour, and over 80 Wh/kg when charged in 6 minutes with further development of the cathode, anode, electrolyte and component weights.
Battery Technology Readiness Level
The battery technology readiness level (“BTRL”) of the G+A CELLS remains at Level 4, whilst significantly progressed through this level as shown in Figure 5. GMG is currently in the process of completing the optimization of the electrochemical behaviour for the pouch cells via ongoing laboratory experimentation. Through collaboration with BIC, it is anticipated that the battery technology readiness will ultimately progress to BTRL 7 and 8 since the equipment and processes needed to produce the G+A CELLS are the same as those employed to make Lithium-Ion Batteries, though no definitive timeline for achievement can be provided at this time.
The Company is confident it can meet the overall timeline, as seen in Figure 6, of its battery cell roadmap that calls for testing of cells with customers in 2026 and small commercial production with support of various partners, including BIC, in 2027.
READ the latest Batteries News shaping the battery market
GMG Doubles Energy Density of 6 Minute Charging Graphene Aluminium-Ion Battery, source
