Waste Sawdust-Derived Nanoporous Carbon as a Positive Electrode for Lithium-Ion Storage

Sustainable resources, particularly those induced from bio-derived waste materials, can be transformed into useful nanocarbon materials with high functionality. In this study, nanoporous carbon materials (N-CMs) were fabricated from waste sawdust using a simple heating process and a carefully controlled activation process. The waste-induced N-CMs had a high specific surface area of ∼3044.6 m 2 g −1 , a nanoporous structure, and > 6 at.% heteroatoms. These properties led to high electrochemical performance with a specific capacity of ∼298 mAh g −1 and excellent cycling stability over 2,000 cycles as a cathode in lithium-ion storage. Moreover, when the N-CMs were assembled with a nanostructured carbon-based anode, all full carbon-based cells could deliver high specific energy and specific power of ∼377 Wh kg −1 and ∼20,247 W kg −1 , respectively, with a long-term cycle life of more than 1,000 cycles.