首页|From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries
From waste to wealth:Coal tar residue derived carbon materials as low-cost anodes for potassium-ion batteries
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Carbon materials are widely recognized as highly promising electrode materials for various energy storage system applications.Coal tar residues(CTR),as a type of carbon-rich solid waste with high value-added utilization,are crucially important for the develop-ment of a more sustainable world.In this study,we employed a straightforward direct carbonization method within the temperature range of 700-1000℃ to convert the worthless solid waste CTR into economically valuable carbon materials as anodes for potassium-ion batter-ies(PIBs).The effect of carbonization temperature on the microstructure and the potassium ions storage properties of CTR-derived car-bons(CTRCs)were systematically explored by structural and morphological characterization,alongside electrochemical performances as-sessment.Based on the co-regulation between the turbine layers,crystal structure,pore structure,functional groups,and electrical con-ductivity of CTR-derived carbon carbonized at 900℃(CTRC-900H),the electrode material with high reversible capacity of 265.6 mAh•g-1 at 50 mA•g-1,a desirable cycling stability with 93.8％capacity retention even after 100 cycles,and the remarkable rate perform-ance for PIBs were obtained.Furthermore,cyclic voltammetry(CV)at different scan rates and galvanostatic intermittent titration tech-nique(GITT)have been employed to explore the potassium ions storage mechanism and electrochemical kinetics of CTRCs.Results in-dicate that the electrode behavior is predominantly governed by surface-induced capacitive processes,particularly under high current densities,with the potassium storage mechanism characterized by an"adsorption-weak intercalation"mechanism.This work highlights the potential of CTR-based carbon as a promising electrode material category suitable for high-performance PIBs electrodes,while also provides valuable insights into the new avenues for the high value-added utilization of CTR.
coal tar residuecarbon materialsanodepotassium-ion batterieshigh value-added
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