Wang Lanhao, Yu Xiaodong, Jiang Zhendong, Li Xusheng, Zhang Chuanxiang
State Key Laboratory of Coking Coal Resources Green Exploitation, China University of Mining and Technology Xuzhou 221116 China.
School of Chemical Engineering and Technology, China University of Mining and Technology Xuzhou 221116 China.
RSC Adv. 2024 Oct 4;14(43):31587-31597. doi: 10.1039/d4ra05104a. eCollection 2024 Oct 1.
Coal is a premium carbon material precursor as anode materials for sodium-ion batteries (SIBs). Additionally, developing anode materials with large capacity and rapid charging performance is essential for the advancement of SIBs. Consequently, in this work, coal-based reduced graphene oxide (CrGO) was prepared as an anode materials for SIBs by a modified Hummers-high temperature thermal reduction method with different ranks of coal (coal-based graphite, CG) as a precursor. The CG prepared from higher-rank coal exhibits a higher degree of graphitization, and its graphene layers are easier to exfoliate. The unique microstructure of CrGO provides stability during the sodium storage process and exhibits fast ion capacitive adsorption behavior, enhancing reaction kinetics. CrGO, with an initial reversible capacity of up to 331 mA h g at a current density of 0.03 A g, achieves a specific capacity of 75 mA h g, even at a high current density of 10 A g. Notably, CrGO also maintains a good specific capacity of 123 mA h g after 1000 cycles at a current density of 1 A g, with a capacity retention rate of 91.8%. This study highlights the potential for using coal-derived materials in the development of high-performance anode materials for SIBs, promoting the green and high-value utilization of coal.
煤作为钠离子电池（SIBs）的负极材料，是一种优质的碳材料前驱体。此外，开发具有大容量和快速充电性能的负极材料对于钠离子电池的发展至关重要。因此，在本工作中，采用改进的Hummers-高温热还原法，以不同煤阶的煤（煤基石墨，CG）为前驱体制备了用于钠离子电池的煤基还原氧化石墨烯（CrGO）负极材料。由高阶煤制备的CG具有更高的石墨化程度，其石墨烯层更容易剥离。CrGO独特的微观结构在储钠过程中提供稳定性，并表现出快速的离子电容吸附行为，增强了反应动力学。在电流密度为0.03 A g时，CrGO的初始可逆容量高达331 mA h g，即使在10 A g的高电流密度下，其比容量仍达到75 mA h g。值得注意的是，在1 A g的电流密度下循环1000次后，CrGO的比容量仍保持在123 mA h g，容量保持率为91.8%。本研究突出了煤衍生材料在开发高性能钠离子电池负极材料方面的潜力，推动了煤的绿色高值利用。
