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Graphene Manufacturing Group says G CELLS completed 1,000 charge-and-discharge cycles, with each charge and discharge taking six minutes, without measured performance reduction. The 1.5 Ah cells were tested at 7C; separate 10C results included 58 Wh/kg specific energy and 94% energy efficiency. The reported results are company-released test data, and larger-format performance remains to be shown.
Graphene Manufacturing Group (GMG) says its graphene aluminum-ion G CELLS completed 1,000 charge-and-discharge cycles with each charge and discharge taking six minutes, without measured performance reduction. The 1.5 amp-hour pouch cells were tested at a 7C rate, according to data released by the company, offering an update on battery technology being developed for applications where charging speed and durability matter.
The Battery Innovation Center in Indiana built the pouch cells and collected the test data. GMG says it developed, manufactured and supplied the graphene materials used in the cells at its Brisbane Battery Development Centre. The company describes G CELLS as graphene aluminum-ion cells that use no lithium or rare-earth materials.
The 1,000-cycle result is for cells tested at 7C. GMG says that count is double the total in its previous update, which covered cells cycled at 10C. The latest report also gives separate measurements from six-minute charging and discharging tests at 10C: specific energy was 58 watt-hours per kilogram, and energy efficiency was 94%.
GMG compared the 10C results with a lithium titanate oxide (LTO) cell tested in the same six-minute charge-and-discharge interval. The company reports that the LTO cell reached 80% of its original capacity after 82 cycles, a level commonly treated as end of life, while the G CELL tested at 10C had a 10% performance reduction after 393 cycles. These are distinct test results from the 1,000-cycle, 7C data.
Fast Charging Meets Cycle Durability
Battery makers and vehicle manufacturers need cells that can charge quickly without losing capacity or wasting too much energy. GMG’s reported 1,000 cycles at 7C provide a durability data point for its developing chemistry, while the separate 10C efficiency result speaks to energy lost during rapid charging and discharging.
The figures may be relevant to electric vehicles and energy storage, but they do not establish how a commercial battery pack would perform. The reported cells are 1.5 Ah pouch cells, and cell-level results do not by themselves establish pack-level charging time, useful range, safety, cost, or service life. GMG says it is continuing work on energy density, 10C cycle life and larger cell formats.
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Earlier Tests and 10C Comparisons
GMG is developing G CELLS under a joint development agreement with Rio Tinto. The company’s report distinguishes the current 7C cycle count from earlier and parallel 10C testing. At 10C, the company reports that a G CELL’s specific energy reached 58 Wh/kg, up from 39 Wh/kg in its previous update, which GMG describes as a 48% increase.
The same six-minute test interval was used for the company’s LTO comparison, but the reported cycle-life figures are not a single head-to-head test at one rate: the 1,000-cycle G CELL result was at 7C, while the LTO result and the second G CELL result were at 10C. That distinction matters when interpreting the company’s comparison of durability.
“Energy that isn’t lost as heat is what makes fast charging practical at the system level.”
— Bob Galyen, GMG director and former chief technology officer of CATL
Limits of the Published Test Data
The release does not provide the full test protocol, the number of cells tested, or detailed operating conditions such as temperature. It is also not clear from the supplied report how the company defined or measured “no performance reduction” across the 1,000 cycles. The figures should be understood as GMG-reported test results, not independently established commercial performance.
No larger-format results, production timetable, pricing, pack-level performance or independent validation are provided in the source material. The comparison also involves different C-rates for the main 1,000-cycle result and the cited LTO result, so the reported cycle counts should not be treated as a like-for-like comparison at one test rate.
Scaling Beyond Pouch Cells
GMG says its next work will focus on improving energy density and 10C cycle life and scaling the technology to larger cell formats. The company has not provided a timetable or specific milestones for those steps in the source material.
Further test results would help show whether the reported performance can be repeated across more cells and maintained at larger sizes. Until then, the 1,000-cycle result is a laboratory-scale data point rather than evidence of a production-ready battery or a defined launch schedule.
Key Questions
What did GMG report about its G CELLS?
GMG says its cells completed 1,000 six-minute charge-and-discharge cycles without measured performance reduction in testing at 7C.
Who tested the cells?
The Battery Innovation Center in Indiana built the 1.5 Ah pouch cells and collected the data. GMG supplied the graphene materials and reports the results.
Were the 1,000 cycles completed at 10C?
No. GMG reports the 1,000-cycle result at 7C. The company gives separate 10C results, including 58 Wh/kg specific energy and a 10% performance reduction after 393 cycles for another G CELL.
Are G CELLS ready for commercial use?
The source material does not establish commercial readiness. It describes 1.5 Ah pouch-cell testing and says GMG is still working on larger formats, energy density and 10C cycle life.
What remains unknown about the test?
The supplied report does not give the full protocol, sample size, detailed test conditions, independent validation or a production timetable. Those details are needed to judge how the results may translate to larger batteries.
Source: rss
