Re-imagining the daniell cell: ampere-hour-level rechargeable Zn-Cu batteries.

The Daniell cell (Cu Zn), was invented almost two centuries ago, but has been set aside due to its non-rechargeable nature and limited energy density. However, these cells are exceptionally sustainable because they do not require rare earth elements, are aqueous and easy to recycle. This work addresses key challenges in making Daniell cells relevant to our current energy crisis.