LiFePO4纳米晶的尺寸、形貌调控及锂电池性能研究

由于材料的电化学性能与其尺寸、形貌和结构密切相关,本文围绕乙二醇体系制备LiFePO_4纳米晶展开了材料的尺寸和形貌调控合成探索,并对材料进行了锂电池性能表征。改变体系的反应物浓度,LiFePO_4纳米晶的尺寸明显发生变化,当体系中FeSO_4的浓度为0.15mol/L时,得到的LiFePO_4纳米晶尺寸最小,其锂离子电池的容量稍高于其他尺寸的LiFePO_4纳米晶。葡萄糖的添加量对LiFePO_4纳米晶的形貌会产生影响,但对锂离子电池性能影响不大。

Size and Shape Control of LiFePO4 Nano-materials for Lithium Ion Battery

As it is well known that the performance of electrode materials are highly related to particle size, shape and configuration, it is essential to build controllable synthesis strategies for the electrode materials. In this work, valuable explorations have been carried out on the size and shape control of LiFePO4 nano-materials in ethylene glycol solution, and their electrochemical performances were carefully characterized. By changing the concentration of the reagents, the sizes of obtained LiFePO4 nano-materials were altered. When the concentration of FeSO4 reagent reached 0.15M, the obtained LiFePO4 nano-materials showed the minimum size and highest specific capability. By adding different amount of glucose, the morphology of the obtained LiFePO4 nano-materials were changed, but the electrochemical performance of these materials were not obviously influenced.