Looks like lithium ion battery density has tripled since 2010 from about 100 Wh/kg to 300 Wh/kg: https://cleantechnica.com/2020/02/19/bloombergnef-lithium-ion-

Looks like lithium ion battery density has tripled since 2010 from about 100 Wh/kg to 300 Wh/kg: https://cleantechnica.com/2020/02/19/bloombergnef-lithium-ion-battery-cell-densities-have-almost-tripled-since-2010/ https://cleantechnica.com/2020/02/19/bloombergnef-lithium-io... 160 Wh/kg for sodium ion would be higher than the ~105 Wh/kg LMO cathode and about in line with LCO, LMO/LNO and NMC cathodes up through 2012. I think LMO is lithium manganese oxide, which might be the same type of battery as in my 2013 Nissan Leaf. Mine's 24 kWh, but they're up to 62 kWh now: https://www.batterydesign.net/nissan-leaf/ https://www.batterydesign.net/nissan-leaf/ They use AESC cells, which are 80% nickel with a Ni-Mn-Co mix: https://insideevs.com/news/348513/envision-aesc-ncm-811-batteries/ https://insideevs.com/news/348513/envision-aesc-ncm-811-batt... Perhaps better cathodes could double sodium ion battery density over the next decade?