Fig. 5. Morphology and electrochemical performance of lightweight nickel-coated melamine foam.

Optical images of (A) melamine foam and (B) nickel-coated melamine foam. (C) SEM image of the nickel-coated melamine foam. (D) Optical images of nickel-coated melamine foam in lithium polysulfide electrolyte during charging and discharging. (E) Charge/discharge voltage profiles of the nickel-coated melamine foam electrode at 0.2C within a potential window of 1.5 to ∼2.8 V versus Li⁺/Li⁰. (F) Rate performance of the nickel-coated melamine foam electrode at different current densities. (G) Cycling performance and Coulombic efficiency of the nickel-coated melamine foam electrode at 0.5C for 200 cycles.