Correction to: Nature Energy https://doi.org/10.1038/s41560-021-00782-0, published online 1 March 2021.

In the version of this Article originally published, the following reference should have been included: “Ofer, D., Pullen, A. W. & Sriramulu, S. Polycrystalline metal oxide, methods of manufacture thereof, and articles comprising the same. US patent 9,391,317 (2016)”. It has now been added as ref. 9 and cited in the sentence beginning “Much effort has been spent on exploring new cathode chemistry...” Subsequent references have been renumbered. All versions of the Article have been amended.