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This report[0] says that battery energy densities have almost tripled since 2010. [0]: https://cleantechnica.com/2020/02/19/bloombergnef-lithium-ion-battery-ce

• _hypx 4y ago
  The report is wrong. It doesn't even make sense since there is clearly a dot above 200 Wh/kg in 2012. Meaning the graph is only claiming a 40-50% improvement in the last decade. But regardless, the report is wrong because we most definitely had reached 250 Wh/kg by 2010. Panasonic mass produced a cell with those specs start in 2009: https://news.panasonic.com/global/press/en091218-2 https://news.panasonic.com/global/press/en091218-2 Furthermore, there is no way of buying that 300 Wh/kg cell shown on the chart. No seems to have ever found one available as a commercial product. Meaning it is likely an experimental cell that never made it to production.