Biomass Waste, Coffee Grounds-derived Carbon for Lithium Storage

Biomass waste-derived carbon is an attractive alternative with environmental benignity to obtain carbon material.In this study, we prepare carbon from coffee grounds as a biomass precursor using a simple, inexpensive, and environmentally friendly method through physical activation using only steam.The coffee-derived carbon, having a micropore-rich structure and a low extent of graphitization of disordered carbon, is developed and directly applied to lithium-ion battery anode material.Compared with the introduction of the Ketjenblack (KB) conducting agent (i.e., coffee-derived carbon with KB), the coffee-derived carbon itself achieves a reversible capacity of ~200 mAh/g (0.54 lithium per 6 carbons) at a current density of 100 mA/g after 100 cycles, along with excellent cycle stability.The origin of highly reversible lithium storage is attributed to the consistent diffusion-controlled inte…