The study of the new anodic materials for lithium-ion batteries——the preparation, characterization and performance of Sn-Ni alloy and carbon nano-tube composite

论文第一部分主要考察了几种Sn-Ni合金的形貌、结构和电化学嵌锂性能。合金材料的电化学性能与材料的结构、形貌、锡镍比、制备条件等均有关。 我们通过液相还原的方法合成了非晶态的Sn-Ni合金，结果发现非晶态的Sn-Ni合金的比容量很高，第一循环放电容量高达750mAh/g，可是循环性能却很差，20循环后放电容量只剩下440mAh/g左右，为首次放电容量的59%。我们还通过调节不同的SnCl2和NiCl2的比例制备出不同Sn含量的非晶态Sn-Ni合金，结果发现随着Sn含量的增加，材料的比容量增加，但循环性能却变差，可见Sn决定着合金的比容量，而Ni的含量及存在形态却很大程度影响着材料的循环性能。...The first part of the dissertation addresses the morphology, structure and electrochemical performance of several sorts of Sn-Ni alloys as the anodic materials for lithium-ion batteries. The electrochemical properties of the alloy materials have been found to be closely related to their intrinsic structure, morphology, proportion of Sn and Ni, condition of preparation, and so on. We have synthe...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：20002506

Preparation and electrochemical performance of Ni-Sn alloys

[中文文摘]作为锂离子电池用非碳类负极材料,合金或金属间化合物备受关注。合金材料在循环过程中的体积变化是一个致命缺点。从抑制体积变化的角度出发,根据"BufferMatrix"的概念,将活性相植入到非活性相载体中。镍作为非活性相,锡作为活性相,用不同的方法制备了非晶态锡镍合金和晶态锡镍合金(Ni3Sn),研究了其形貌特征、晶体结构及电化学性能。在高温下用氢气还原的Ni3Sn具有稳定的晶体结构、较高的比容量(300mAh/g)和优良的循环性能。[英文文摘]As a carbon alternative anode material for Li-ion battery, alloys or inter-metal compounds were focused intensively.The alloy materials had a fatal disadvantage that the volume swelling existed during the cycles.The active materials embedded in inactive carrier based on the concept of "Buffer Matrix" to restrain the volume swellings. Ni as an inactive phase and Sn as an active phase, amorphous Ni-Sn alloy and crystalline Ni_3Sn were synthesized employing different methods which led to different morphology.The morphology characteristics , crystal structures and electrochemical performance of the materials were investigated.Ni3Sn reduced by H2 at high temperature had a stable crystal structure ,higher specific capacity (300 mAh/g) and excellent cycle performance.973项目(2002CB211804); 国家自然科学基金(20373058); 福建省科技项目(2003H044); 厦门市科技计划项目(3502Z2001234)

The Synthesis, Characteristics and Performance of CNT Composites as Anodic Materials in Litium-ion Battery

[中文文摘]作为锂离子电池负极材料,碳纳米管和金属锡或其氧化物都曾引起过人们浓厚的兴趣,但由于其自身的缺陷,这些材料均未能得到进一步的发展.本文以不同方法合成了碳纳米管和金属锡或其氧化物的复合材料,对其结构、形貌进行表征,并考察它的电化学性能.[英文文摘]As an anodic material for lithium ion battery the carbon nano-tube (CNT) and some compounds based on tin have ever been investigated intensively. The fruited progress has not been made yet, however. In this paper the composites of CNT and Sn/SnO_(2)were synthesized employing two methods and characterized by SEM and XRD. And the electrochemical performance of the composites was investigated.973项目(2002CB211800); 国家自然科学基金(20373058); 福建省科技项目(2003H044)资助

Study of Electrochemical Lithium Intercalation Performance of Ni_(0.67)Mg_(0.33)O

　通过溶胶-凝胶法制备了Ni-Mg-O及作为对照物的NiO样品,研究了其电化学嵌锂性能,并对样品进行了XRD结构表征,Rietveld精化以及贮锂性能测试.结果表明:Ni-Mg-O电极由于Mg的掺入而抑制了其中Ni2+的还原,导致材料的比容量降低.但同时又因该样品形成均一的固溶体使得NiO分散效果较好,从而改善其循环性能.In the present work, Ni0.67Mg0.33O and NiO were produced by sol_gel method, and characterized by XRD, a rietveld refinement and the discharge/charge test.It was found that the magnesium_doping restrained the reduction of Ni and decreased the reversible capacity for the sample of Ni0.67Mg0.33O. But the formation of the solid solution after the magnesium_doping facilitated the high dispersion of NiO, and accordingly improved the electrochemical performance.作者联系地址：厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室,厦门大学化学系固体表面物理化学国家重点实验室 福建厦门　361005 ,福建厦门　361005 ,福建厦门　361005 ,福建厦门　361005 ,福建厦门　36100

Preparation and Electrochemical Lithium Intercalation Performance of Different Shaped Carbon Nanotube

以乙炔作为反应气 ,用化学气相沉积法 (CVD)和模板法在不同温度 (60 0℃、70 0℃ )下制备了不同形貌的碳纳米管 ,并采用TEM ,HRTEM ,SEM ,XRD ,Raman和充放电实验方法研究其形貌、结构和电化学嵌锂性能 .结果表明 ,不同的制备方法及反应温度对碳纳米管的形貌、结构特征和电化学嵌锂性能均有明显的影响 .在制备的样品中 ,制备温度越低 ,样品的石墨化程度越差 ,可逆嵌锂容量相应越高In the present work, different shaped carbon nanotubes were produced by the general CVD and the template method at different temperature (600 ℃,700 ℃) with the reaction gas of acetylene. The morphology, structure and the electrochemical lithium intercalation performance were comparatively studied and characterized by TEM, HRTEM, SEM, XRD, Raman techniques and Charge/Discharge Test. It was found that the different preparation methods and temperatures all had an obvious effect on these properties of carbon nanotubes. In our samples, with the increase of preparation temperature, the degree of crystallinity decreased, and the reversible specific capacity increased respectively.作者联系地址：厦门大学化学系,固体表面物理化学国家重点实验室,厦门大学化学系,固体表面物理化学国家重点实验室,厦门大学化学系,固体表面物理化学国家重点实验室,厦门大学化学系,固体表面物理化学国家重点实验室,厦门大学化学系,固体表面物理化学国家重点实验室 福建厦门,361005 ,福建厦门,361005 ,福建厦门,361005 ,福建厦门,361005 ,福建厦门,361005Author's Address: State Key Lab for Physical Chemistry of Solid Surface, Dept. of Chem., Xiamen Univ., Xiamen, 361005, Chin

The Synthesis, Characteristics and Performance of CNT Composites as Anodic Materials in Litium-ion Battery

作为锂离子电池负极材料,碳纳米管和金属锡或其氧化物都曾引起过人们浓厚的兴趣,但由于其自身的缺陷,这些材料均未能得到进一步的发展.本文以不同方法合成了碳纳米管和金属锡或其氧化物的复合材料,对其结构、形貌进行表征,并考察它的电化学性能.As an anodic material for lithium ion battery the carbon nano-tube (CNT) and some compounds based on tin have ever been investigated intensively. The fruited progress has not been made yet, however. In this paper the composites of CNT and Sn/SnO_(2)were synthesized employing two methods and characterized by SEM and XRD. And the electrochemical performance of the composites was investigated.作者联系地址：厦门大学化学系,厦门大学化学系,厦门大学化学系,厦门大学化学系,厦门大学化学系,厦门大学化学系 厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005 ,厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005 ,厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005 ,厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005 ,厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005 ,厦大宝龙电池研究所,固体表面物理化学国家重点实验室,福建厦门361005Author's Address: State Key Lab for Physical Chemistry of Solid Surface, Xiamen Univ., PowerLong Battery Institute, Department of Chemistry , Xiamen University, Xiamen 361005, Chin