Per the article: "the energy density of M3P batteries is about 15% higher than that of lithium iron phosphate batteries, reaching 210 Wh/kg....." Is this a typo? 210 Wh/kg is nothing special. Color me unimpressed.
The mysterious new Tesla order to the world's largest electric vehicle battery manufacturer CATL turned out to be not of its novel Kirin batteries, but of LFP packs. Not your regular LFP battery, though, rather a greatly improved chemistry with higher density slated for the Model Y.