Enhanced electrochemical performances of coal liquefaction residue derived hard carbon coated by graphene as anode materials for sodium-ion batteries
Enhanced electrochemical performances of coal liquefaction residue derived hard carbon coated by graphene as anode materials for sodium-ion batteries
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石墨烯包覆煤液化残渣硬碳增强钠离子电池负极材料的电化学性能
DOI：
10.1016/j.fuproc.2018.04.033
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发表时间：
2018-09
影响因子：
7.5
通讯作者：
Qiu Jieshan
中科院分区：
文献类型：
--
作者：
Liu Ruifeng;Li Yulong;Wang Chunlei;Xiao Nan;He Lei;Guo Hongyi;Wan Peng;Zhou Ying;Qiu Jieshan
将化学改性的煤液化渣（CLR）衍生硬碳（HC@G）与氧化石墨烯混合，通过热处理制备了钠离子电池用石墨烯包覆硬碳复合阳极。不规则形状的硬碳颗粒被褶皱的石墨烯片均匀地包裹。HC和HC@G层间间距大，孔隙度差，但石墨烯包覆后生成了更丰富的有利于离子传输的孔隙结构。由于石墨烯片桥接了导电性差的硬碳颗粒，因此通过伏安测试和EIS分析可以检测到HC@G具有更好的导电性。石墨烯涂层对钠的存储容量贡献不大。然而，HC@G在2 a·g−1的高电流密度下，具有更好的倍率性能和显著的循环能力，在2000次 循环后，容量保持率为83%。HC@G阳极具有丰富的离子扩散通道和广泛的电子传导路径，具有层次化的结构。
A graphene coated coal liquefaction residue (CLR) derived hard carbon (HC@G) composite anode for sodium ion batteries was prepared by thermal annealing the mixture of the chemically modified hard carbon with graphene oxide. The irregular shaped hard carbon particles were coated uniformly by wrinkled graphene sheets. Both HC and HC@G possess large inter-layer spacing and poor porosity, but a richer pore structure that facilitating ion transport was generated after graphene coating. Because poor conductive hard carbon particles are bridged by graphene sheets, a better conductivity of HC@G is detected by voltammetry test and the EIS analysis. Graphene coating contributes little to the sodium storage capacity. However, HC@G exhibits a much better rate performance and a dramatic improvement of cycling capability with the capacity retention 83% after 2000 cycles at a high current density of 2 A·g−1. The impressing rate and cycle performances of HC@G anode are attributed to the hierarchical structure with rich ion diffusion channels and extensive electronic conduction path.
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