Ceylon Graphite tests the performance of spherical vein graphite anode materials

According to foreign media reports, Ceylon Graphite Company conducted full cell testing on commercial-sized soft-packed cells using spherical vein graphite material in accordance with automotive standards.

(Image source: Ceylon Graphite)

The Ceylon Graphite vein graphite anode material performed significantly better than similar anodes made from industry-standard commercial synthetic graphite and achieved excellent reproducibility in tests conducted in 2021-2023. This is the first full cell test of spherical vein graphite material in a lithium-ion battery.

The tests were carried out at Warwick Manufacturing Group (WMG), part of the University of Warwick's Center for Energy Innovation.

Repeated testing shows that Ceylon Graphite's unique natural vein-like graphite material has a discharge capacity of 161 mAh/g (the published industry standard is 153 mAh/g); after 120 cycles, the capacity loss is very small.

Ceylon Graphite believes that the performance of vein graphite materials is due to the high crystallinity of vein graphite; internal purification technology that does not use any hydrofluoric acid (patent pending); and Ceylon Graphite’s proprietary spheroidization and formulation technology.

In the full-cell system, these cells are tested at a rate of C/5 (i.e., charging and discharging for 5 hours each). Extended cycling exhibits reversible charge-discharge behavior, with a total capacity loss of less than 15% over 120 cycles.

For the best-performing vein graphite material, the average reversible capacity under C/5 stable cycling is 161mAh/g, while the reversible capacity of standard synthetic graphite measured at the same rate is 153mAh/g. The cell shows good stability at different rates, including very high current densities. After low-speed cycling, the battery capacity can be restored, thereby exhibiting high-rate capability.