PVP模板法合成锂离子电池用MoS_2/C负极材料
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摘要
以聚乙烯吡咯烷酮(PVP)为模板,采用水热法合成了Mo S2/C复合材料。通过扫描电子显微镜法(SEM)、透射电子显微镜法(TEM)、X射线衍射光谱法(XRD)、热重分析法(TGA)、元素分析和N2吸附-脱附等测试方法,研究了Mo S2/C的微观形貌、晶体结构、热稳定性、元素组成及比表面积等物理化学特性。结果表明,Mo S2/C为六方晶系,具有微球形貌,直径约为500 nm,且有部分无定形碳包裹在微球表面。恒流充放电测试结果表明,Mo S2/C首次放电比容量为820m Ah/g;在500 m A/g的电流密度下,经过100次循环,比容量可稳定在660 m Ah/g。
MoS_2/C composite was synthesized by a hydrothermal method using(PVP) as the template. Themicro-morphology, crystal structure, thermal stability, elemental component and specific area of the product werecharacterized by SEM, TEM, XRD, TGA, elemental analysis and nitrogen adsorption-desorption measurements. It isconfirmed that the MoS_2/C has a hexagonal crystal structure and shows a micro-spherical morphology with thediameter of approximately 500 nm. The surface of the MoS_2/C microspheres were coated by amorphous carbon. Theresults of galvanostatic charge-discharge measurement indicate that MoS_2/C delivers an initial discharge capacity of820 m Ah·g-1. Its discharge capacity is stabilized around 660 m Ah·g-1 at the current density of 500 m A·g-1 after 100 cycles.
MoS_2/C composite was synthesized by a hydrothermal method using(PVP) as the template. Themicro-morphology, crystal structure, thermal stability, elemental component and specific area of the product werecharacterized by SEM, TEM, XRD, TGA, elemental analysis and nitrogen adsorption-desorption measurements. It isconfirmed that the MoS_2/C has a hexagonal crystal structure and shows a micro-spherical morphology with thediameter of approximately 500 nm. The surface of the MoS_2/C microspheres were coated by amorphous carbon. Theresults of galvanostatic charge-discharge measurement indicate that MoS_2/C delivers an initial discharge capacity of820 m Ah·g-1. Its discharge capacity is stabilized around 660 m Ah·g-1 at the current density of 500 m A·g-1 after 100 cycles.
引文
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[3]ZHANG Y G,LI Y,LI H P,et al.Synthesis of hierarchical MoS2microspheres composed of nanosheets assembled via facile hydrothermal method as anode material for lithium-ion batteries[J].Journal of Nanoparticle Research,2016,18:1-9.
[4]DAS S K.Coaxial growth of carbon coated MoS2nanoparticles on carbon nanotube and their electrochemical evaluation[J].Materials Letters,2014,130:240-244.
[5]BALENDHRAN S,WALIA S,NILI S,et al.Two-dimensional molybdenum trioxide and dichalcogenides[J].Advanced Functional Materials,2013,23:3946.
[6]XIAO J,WANG X J,YANG X Q,et al.Electrochemically induced high capacity displacement reaction of PEO/MoS2/graphene nanocomposites with lithium[J].Advanced Functional Materials,2011,21:2840-2846.
[7]蔡亚菱,李亚飞,王增梅,等.CTAB辅助水热合成球状纳米花MoS2/C复合材料及其电化学性能研究[J].无机材料学报,2016,31:1289-1294.
[8]CHEN X,LI L,WANG S Q,et al.Synthesis and electrochemical performances of MoS2/C fibers as anode material for lithium-ion battery[J].Materials Letters,2016,164:595-598.
[9]PARK S K,LEE J,BONG S,et al.Scalable synthesis of few-layer MoS2incorporated into hierarchical porous carbon nanosheets for high-performance Li-and Na-ion battery anodes[J].ACS Appl Mater Interfaces,2016,8:19456-19465.
[10]赵立平,孟未帅,王宏宇,等.二硫化钼-碳复合材料用作钠离子电容电池负极材料[J].物理化学学报,2017,33:787-794.