【作者】 王舒平；

【导师】 郭今心； 杨延钊；

【作者基本信息】 山东大学 ， 无机化学， 2013， 硕士

【摘要】 磷酸亚铁锂(LiFePO4)因其原料来源广泛、理论比容量高、结构稳定、循环性能优异且对环境无污染,成为最具发展前景的锂离子电池正极材料之一。本论文选取了共沉淀和溶剂热两种方法来合成碳包覆的纳米磷酸亚铁锂。论文的主要工作归纳如下：1.在乙二醇的参与下,在水溶液中,采用简单方便的一步共沉淀法得到LiFePO4的前驱体,经过煅烧得到纳米级的LiFePO4/C复合材料。该材料具有紧密完整的碳包覆层和优异的电化学性能。该过程适宜工业化大规模生产。2.采用非模板低温溶剂热法合成了具有不同微观结构的LiFePO4颗粒,通过煅烧生成碳包覆的LiFePO4复合材料。每一种结构都是由LiFePO4小颗粒自组装而成。在还原气氛中,采用两步煅烧的方式(250℃650℃)对材料进行热处理,以得到紧密完整的碳包覆层。更多还原

【Abstract】 LiFePO4is a very hopeful positive electrode material for further lithium-ion batteries materials, because of abundance of raw materials, high theoretical capacity, stable structure, excellent cycling performance and pollution-free. A simple one-step co-precipitation process and solvothermal method were carried out to synthesize nanoscale LiFePO4/C composites. The detailed information of the paper is summarized as follows:1. A one-step co-precipitation process with ethylene glycol in aqueous solution was carried out to provide a convenient and economic route for the synthesis of nanoscale LiFePO4/C composites with uniform carbon coating and excellent electrochemical performance. It can be easily scaled up for commercialization.2. A simple template-free, low-temperature solvothermal method is developed for the synthesis of multi-morphous LiFePO4nanoparticles as well as carbon-coated LiFePO4composites. Each structure consists of LiFePO4nano-particles self-assembled. To get uniform carbon coating, the materials are subjected to further temperature treatment (250℃,650℃) under an inert atmosphere.更多还原