Every October, farmers across north India burn crop residue to clear their fields, and the smoke settles over Delhi for weeks.
The stubble is a waste product with no better use, which is why burning persists despite the fines and the campaigns against it.
It is also carbon.
Heated the right way, biomass turns into hard carbon, the material that serves as the anode in a sodium-ion battery, the layer that sodium ions move in and out of as the cell charges and discharges.
was founded in Roorkee in 2019 to make that connection commercially.
