《锂离子电池高电位正极材料的合成及性能研究》》-毕业设计（论文）.doc

滨州学院学士学位论文 PAGE XVII PAGE 6 毕业设计（论文） 题 目 锂离子电池高电位正极材料的 合成及性能研究 系 （院） 化学与化工系 专 业 化学工程与工艺 班 级 2008级1班 学生姓名 学 号 2008100121 指导教师 职 称 讲师 二〇一二年六月二十三日 锂离子电池高电位正极材料的合成及性能研究 摘 要 近年来，随着现代科技的发展与进步，人们对于能源的需要越来越迫切。但是商业化的锂离子电池正极材料LiCoO2由于价格高，有毒性，人们一直努力在寻找其替代品。锰酸锂由于价格低廉、无毒而倍受关注。LiNi0.5Mn1.5O4主要利用锰资源，而我国锰资源丰富且价格相对便宜，使得以锰为主的正极材料有很大的应用前景，并且该材料理论容量可达到147mAh/g，具有更高的能量密度，有希望作为动力电池得到应用。 本文首先采用溶胶凝胶法和改进固相法制备了LiNi0.5Mn1.5O4，其次探究了在改进固相法合成材料的过程中前驱体粉末压片与否对材料材料电化学性能的影响，最后在利用改进固相法合成材料的基础上探究了碳包覆以及氟掺杂对材料电化学性能的影响，研究结果表明：使用改进固相法合成的材料的放电容量为120mAh/g，而使用溶胶凝胶法法合成的材料的放电容量仅为85mAh/g；合成工艺中压片合成的材料放电容量为115mAh/g，而不压片的材料放电容量为105mAh/g；表面包覆C后材料的放电容量大大降低，仅为34mAh/g；而进行了氟掺杂的材料的电化学性能并未提高。 关键词：锂离子电池；正极材料；LiNi0.5Mn1.5O4 Synthesis and properties of high potentials cathode material for lithium ion battery Abstract In recent years, with the development of modern science and technology, the energy needs of people more and more urgent. Because of the high price and toxicity of the industrialized LiCoO2 cathode material, more attention has been paid to the substitutes for it. Lithium manganese oxide proves one of the most promising cathode materials since it is inexpensive and environmental friendly. Whats more, manganese resources in china is abundant and relatively cheap price which makes manganese based cathode materials have great application prospect.The theoretical capacity is 147mAh/g of LiNi0.5Mn1.5O4, so it possesses higher energy density and is promising to be used in Li ion battery as power sources for electrical vehicles. Firstly sol gel method and improved solid phase method was used to synthesis LiNi0.5Mn1.5O4, secondly the influence of the tablets on the electrochemical performance of the material synthesize by improved solid phase method, finally the influence of carbon coating and fluorine doping was studied, on the electrochemical of LiNi0.5Mn1.5O4 was studied indicate that discharge capacity of the material which use improved solid phase method is 120mAh/g, while the d