摘要
利用氧化还原石墨烯(rGO)优异的物化性质,通过溶剂热法制备了氧化还原石墨烯支撑的硫化锰(MnS/rGO)高性能锂离子电池负极材料。采用XRD和SEM对材料的物相组成和微观形貌进行了分析,并对其电化学性能开展了相关研究。结果发现,在1.0 A/g电流密度下,循环200次后MnS/rGO电极放电比容量为614.1 mAh/g。在10.0 A/g高倍率电流密度下,MnS/rGO电极平均放电比容量为142 mAh/g。由于rGO优异的导电性和机械韧性,复合了rGO的MnS材料增强了表面Mn^(2+)到Mn^(3+)的氧化反应动力学,加速了锂化/去锂化反应和电荷转移能力,缓解了循环过程中材料体积变化,提高了材料结构稳定性,显示出优异的电化学性能。
The rGO supported MnS electrode was designed based on physicochemical merits of rGO via a facile solvothermal procedure. The crystal structure and micromorphology of MnS/rGO material were investigated by XRD and SEM measurements, and also evaluating its electrochemical properties. The MnS/rGO electrode manifests excellent cycling stability (614.1 mAh/g remaining after 200 cycles at 1.0 A/g) and good rate capability (average discharge capacity of 142 mAh/g at 10.0 A/g). The outstanding electrical conductivity and mechanical toughness of rGO were beneficial for the MnS/rGO composites in terms of enhancing the surface electrochemical oxidation kinetics of Mn2+ to Mn3+, mitigating the volume change in the process of cycling and improving the structure stability, which endowing salient electrochemical performances. The unique advantages of MnS/rGO anodes might open an avenue for conceiving new generation lithium-ion batteries.
作者
张星和
杨晓娜
ZHANG Xing-he;YANG Xiao-na(Baoshan University,Baoshan Yunnan 678000,China)
出处
《电源技术》
CAS
北大核心
2019年第4期556-558,596,共4页
Chinese Journal of Power Sources
基金
云南省教育厅科学研究基金资助性项目(2018JS487)
保山市科技计划资助性项目(2018kjzc15)
关键词
氧化还原石墨烯
硫化锰
锂离子电池
负极
赝电容
reduced graphene oxide
manganese sulfide
lithium-ion batteries
anode
pseudocapacitance
