Article
Open Access
Coal-derived porous carbon anodes for Na-ion batteries
College of Engineering and Mines Research Institute, University of North Dakota, Grand Forks, ND, 58202, USA
Abstract

Developing low-cost and eco-friendly electrode active materials for sodium-ion battery technologies may increase their competency, allowing them to become the next generation of energy storage systems. Low-cost anode materials are urgently required to address this increasing demand. We propose using earth-abundant coal extracted porous carbon anodes prepared via a facile hydro/solvothermal method followed by carbonization at high temperatures. The surface morphology analysis reveals that the hydrothermal carbon (HTC) and solvothermal carbon (STC) samples are randomly aggregated particles with a hierarchical porous structure. Sodium-ion battery tests indicate that the coal-derived anode exhibits stable cycling and high-rate capabilities. The discharge capacity holds 176 mAh/g and 172 mA/g after the 200th cycle at a current density of 100 mA/g, corresponding to the HTC and STC samples, respectively. Voluble products from coal waste-based anodes exhibit remarkable capacities that reduce anode cost and allow us to produce waste to energy for future secondary battery energy storage.

Keywords

coal; hydrothermal; solvothermal; porous carbon; Na-ion battery

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