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

• DOI: 10.1021/acsami.4c07654
• Publication Date: 2024-08-22T21:51:41Z
• Authors: Guokan Liu; Jialiang Yuan; Haoyu Li; Zhuangzhi Li; Changyan Hu; Xianyan Qiao; Mingpei Wang; Bo Yuan; Peng Zhang; Zhenguo Wu
• Keywords: Carbon fibers; Bituminous coal

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).