This is actually published in Nature, so not the typical new-battery-of-the-week bullshit.

https://www.nature.com/articles/s41586-025-09867-2

And of course it’s from China now that US has stopped funding smart people.

Discharge capacity of 1,206 mAh g(sulfur+catalyst)−1, contributing to a maximum energy density of 2,021 Wh kg−1 calculated on the basis of the total electrode mass. With an estimated cost of US$5.03 per kWh.

lithium is 250 Wh/Kg and $150 per Kwhr. So 8X more energy dense and 1/50th the price. However, the low discharge rate means only good for grid storage or electronics.