TSX- and NYSE-listed Platinum Group Metals (PTM) and its subsidiary, Lion Battery Technologies, report that the US Patent and Trademark Office has issued a third patent to Florida International University (FIU) related to platinum group metals (PGMs) being used in lithium batteries.

Specifically, this third patent is related to PGMs being used in the next generation of lithium sulphur batteries.

PTM states that lithium sulphur batteries are well known to have the potential for a significant increase in power-to-weight ratios over traditional lithium-ion batteries, which have been popular in electric vehicle applications, such as those using nickel, manganese and cobalt cathodes.

Under a sponsored research agreement, Lion has exclusive rights to all technology being developed by FIU, including granted patents.

The new patent – titled ‘Battery Cathodes for Improved Stability’, with patent number US 11038 160 B2 – covers a preparation method using PGM catalysts in carbon materials for use as cathodes, with increased emphasis on lithium sulphur batteries.

The new patent broadens protection for US patent 10734 636 B2, issued to FIU on August 4, 2020, covering the composition of carbon cathodes containing PGMs.

However, one of the challenges in lithium sulphur batteries is getting them to charge and discharge hundreds of times, as required in commercial settings.

Lion FIU project leader Dr Bilal El-Zahab says lithium sulphur batteries present twice the capacity retention after 100 cycles using PGMs, compared with the control group without PGMs.

“We have observed lithium sulphur batteries with cycling performance at nearly 300 cycles with greater than 70% capacity retention relative to the first cycle.”

He adds that Lion is still working on enhancing performance and is working towards more than 500 cycles from PGMs-containing lithium sulphur batteries.