Multieffect Preoxidation Strategy to Convert Bituminous Coal into Hard Carbon for Enhancing Sodium Storage Performance

Carbon fibers Bituminous coal
DOI: 10.1021/acsami.4c07654 Publication Date: 2024-08-22T21:51:41Z
ABSTRACT
Preoxidation is an effective strategy to inhibit the graphitization of coals during carbonization. However, single effect traditional preoxidation could barely increase surface-active sites, hindering further enhancement sodium storage. Herein, a multieffect was proposed suppress structural rearrangement and create abundant sites. Mg(NO3)2·6H2O helps introduce oxygen-containing functional groups into bituminous coal at 450 °C, which acted as cross-linking agent carbon layers promote subsequent thermal carbonization process. Besides, residue solid decomposition product MgO would react with The obtained coal-based hard contained more pseudographitic domains storage active optimized sample deliver excellent capacity 287.1 mAh g–1 20 mA g–1, well remarkable cycling stability retention 96.1% after 200 cycles 50 notable 88.9% 1000 300 g–1. This work provides practical convert low-cost advanced anodes for sodium-ion batteries (SIBs).
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