[rsfern]

The uni press release sort of buried the lede, but if you read the methods section of the paper they are doing these measurements in a coin cell with a sodium anode.

This is early stage cathode optimization research, everyone reports current density and charge-discharge curves because the power density requires both high current density and stable operating voltage. Also you want minimal degradation with charging cycles. You can integrate those discharge curves to get power density if you want, but I’m not sure what it’s supposed to really add at this point in the research pipeline. You need to scale up from the lab form factor anyway to get something reasonable to work with

https://www.nature.com/articles/s41586-021-03757-z