An AFM cell that allows the control of the atmosphere over the glassy carbon substrate was built by Virwani et al. They used 1 M LiNO 3 1 M in TEGDME as electrolyte, with different water contents, and analyzed the topography of the deposits during the ORR and OER. A remarkable effect of the water content was observed on the deposit morphology and the discharge capacity of the cell. For instance, the cell capacity increases 11 times when the water content increase from 20 ppm to 4600 ppm. The Li 2 O 2 deposits formed with small water contents exhibit spherical or bar shape in the range between 200 and 400 nm, and they appear at the final of the discharge. With high water content, large toroidal particles (~400 nm) are observed at the beginning of the discharge, while smaller ones are formed later.