精品文档---下载后可任意编辑以石墨为载体的高容量硅碳复合负极材料的制备及性能讨论的开题报告【摘要】本文讨论以石墨为载体的高容量硅碳复合负极材料的制备及性能。硅具有较高的理论比容量和比能量，但是由于其体积膨胀大和容量衰减快的特点，限制了其在锂离子电池中的应用。因此，将硅与碳复合能够有效地改善其电化学性能，提高其循环稳定性和容量保持率。而石墨作为一种优良的导电材料，可以充当硅碳复合负极材料的载体，同时也能够提高复合材料的导电性能。因此，本文采纳化学还原法制备硅碳复合材料，并在石墨表面包覆形成硅碳复合负极材料。通过物理性能测试和电化学性能测试，讨论了该复合负极材料的结构性能和电化学性能，以期提高其在锂离子电池中的应用性能。【关键词】石墨，硅碳复合材料，负极，锂离子电池【Abstract】This paper studies the preparation and properties of high-capacity silicon-carbon composite negative electrode materials based on graphite. Silicon has a high theoretical specific capacity and energy density, but its large volume expansion and fast capacity decay limit its application in lithium-ion batteries. Therefore, silicon-carbon composite can effectively improve its electrochemical performance, improve its cycling stability and capacity retention. Graphite, as an excellent conductor, can serve as a carrier for silicon-carbon composite negative electrode materials, and can also improve the conductivity of composite materials. Therefore, this paper uses chemical reduction method to prepare silicon-carbon composite materials, and coats silicon-carbon composite negative electrode materials on the surface of graphite. The structural and electrochemical properties of the composite negative electrode material were studied by physical and electrochemical performance tests, in order to improve its application performance in lithium-ion batteries.【Keywords】Graphite, Silicon-Carbon Composite, Negative Electrode, Lithium-Ion Battery
