Wang Yingying, Zhang Yue, Ma Huizhen, Tang Yakun, Dai Mengyao, Liu Lang, Cao Yuliang
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830017, Xinjiang, P. R. China.
Engineering Research Center of Organosilicon Compounds & Materials of Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, P. R. China.
Langmuir. 2025 Jul 15;41(27):17914-17923. doi: 10.1021/acs.langmuir.5c01677. Epub 2025 Jul 1.
Semicoke is extensively utilized in the production of carbon-based materials due to its advantages of high carbon yield and low cost. However, as a thermoplastic precursor, it tends to undergo melting and reorganization during thermal decomposition, resulting in the formation of a well-structured graphite lattice, which limits its application in sodium storage. Herein, we introduce an oxidation anchoring cross-linking strategy to synthesize semicoke-based hard carbon (SBHC). This approach effectively incorporates C-O-C and -C(O)-O- functional groups into the semicoke molecules. The introduced oxygen functional groups (OFGs) will enlarge the interlayer spacing and form a more nanoporous structure in the bulk of hard carbon. The optimized SBHC demonstrates a significantly enhanced reversible capacity of 280.84 mAh g, which significantly surpasses the capacity of the raw semicoke-derived hard carbon (134.53 mAh g), with the plateau capacity increase of 2.6 times. This study presents a viable strategy for producing cost-effective, high-performance hard carbon materials for sodium-ion batteries.
半焦因其高碳产率和低成本的优势而被广泛应用于碳基材料的生产。然而，作为一种热塑性前驱体，它在热分解过程中容易发生熔化和重排，导致形成结构良好的石墨晶格，这限制了其在储钠方面的应用。在此，我们引入一种氧化锚定交联策略来合成半焦基硬碳（SBHC）。这种方法有效地将C-O-C和-C(O)-O-官能团引入到半焦分子中。引入的氧官能团（OFGs）将扩大层间距，并在硬碳主体中形成更多的纳米孔结构。优化后的SBHC展现出显著增强的可逆容量，达到280.84 mAh g，这大大超过了由原始半焦衍生的硬碳的容量（134.53 mAh g），平台容量提高了2.6倍。本研究为生产用于钠离子电池的具有成本效益的高性能硬碳材料提供了一种可行的策略。
