Graphene Manufacturing Group battery cells complete 1,000 cycles with no performance loss Proactive uses images sourced from Shutterstock

Graphene Manufacturing Group Ltd (TSX-V:GMG, OTCQX:GMGMF)'s fast-charging graphene battery cells have completed 1,000 cycles with no performance reduction, doubling the cycle life reported in the company's previous update, the company said on Thursday. 

The G CELLS, which are 1.5 Ah cells, were charged and discharged in six minutes at a 7C rate, GMG said.  

The data was collected by the Battery Innovation Center of Indiana on cells made with GMG materials from its Brisbane Battery Development Centre. The work is part of a joint development agreement with Rio Tinto. 

In the same six-minute charge and discharge time, at a 10C rate, a well-known lithium titanate oxide (LTO) battery fell to 80% of its original capacity within 82 cycles. Another G CELL cycled at 10C showed only a 10% reduction after 393 cycles. GMG said its cells effectively last 10 times longer than the LTO cell. 

Energy density rose 48% to 58 Wh/kg at 10C, up from 39 Wh/kg previously reported. The G CELLS also delivered 94% energy efficiency, compared with 64% for the LTO cell. 

"The cycling stability we are seeing from these G®CELLS is genuinely exceptional," said Bob Galyen, GMG director and former chief technology officer of CATL. 

CEO Craig Nicol said the results were "an important proof point for our graphene battery program." 

"Fast charging is one of the biggest barriers to broader electric vehicle and energy storage adoption," Nicol said. "Our focus now is on continuing to improve energy density and 10C cycle life, and on scaling to larger cell formats." 

Chairman Jack Perkowski said the Board has "real confidence in the direction of this program," noting that the Battery Innovation Center has more than 10 years of experience and over 500 battery development projects behind it. 

Shares of GMG added over 6% in Toronto and over the counter in the US on Thursday morning.