醇辅助铁系磷酸盐微纳米材料的可控构筑及其电化学储能特性研究

Poly-metal phosphates materials (LiMPO4, M = Fe, Co, Mn) as the electrochemical energy storage materials have attracted much attention. As a result of harsh synthesis conditions of these materials, the size and phase of poly-metal phosphates materials is hard to control,which seriously affect the performance of electrochemical energy storage. Therefore, it is an urgent problem that a mild synthesis method can be used to synthesize uniform size, single phase, and good performance of electrochemical energy storage materials. To compared with poly-metal phosphate,iron series phosphate (iron phosphate,cobalt phosphate, nickel phosphate) with mild synthesis conditions, rich electrochemical performance, environmental safety, and phosphate polyhedron structure is easy to form more stable molecular structure, which make the iron phosphate micro-nano-materials have potential applications in electrochemical energy storage materials(FePO4 theoretical capacity of 178 mAh g-1). Recently, we found that there were rich coordination roles between ethylene glycol, glycerol, and nickel ions. By the introduction of a small amount of ethylene glycol or glycerol in water, a variety of Ni-micro-nano-phosphate materials can be synthesized. Therefore, this project is based the alcohol molecules assisted iron series phosphate micro-nano-materials synthesis, and explore the growth mechanism of iron series phosphate micro-nano-materials and the electrochemical storage performance for the formation of new surface and interface on, and then discover the underlying reasons for their structure-activity relationship.

复合金属磷酸盐(LiMPO4,M=Fe,Co,Mn)作为电化学储能材料，倍受关注。但这些材料合成条件苛刻，使其尺寸、物相不好控制，严重影响其电化学储能性能。温和合成尺寸均匀、物相单一、性能优异的电化学储能材料是一个急需解决的问题。比较复合金属磷酸盐，铁系（磷酸铁、磷酸钴、磷酸镍）磷酸盐微材料的合成条件温和，具有多氧化态的铁系元素，环境安全性好，同时磷酸根多面体结构易形成较稳定的分子结构等特点，使得铁系磷酸盐微纳米材料在电化学储能材料上具有潜在的应用（FePO4 理论电容量为178 mAh g-1）。近期我们发现乙二醇、丙三醇与镍离子之间有丰富地配位作用，在水中引入少量乙二醇或丙三醇，可以合成多种磷酸镍微纳米材料。因此，本项目拟以醇辅助铁系磷酸盐微纳米材料的合成为基础，探索醇对铁系磷酸盐微纳米材料生长机理，寻找此类材料微纳米化后形成的新表界面对电化学储能性能的影响和其构效关系的内在原因。

铁系（磷酸铁、磷酸钴、磷酸镍）磷酸盐微材料的合成条件温和，具有多氧化态的铁系元素，环境安全性好，同时磷酸根多面体结构易形成较稳定的分子结构等特点，使得铁系磷酸盐微纳米材料在电化学储能材料上具有潜在的应用。近期我们发现乙二醇、丙三醇与镍离子之间有丰富地配位作用，在水中引入少量乙二醇或丙三醇，可以合成多种磷酸钴铵、磷酸镍铵、磷酸钴、亚磷酸镍、亚磷酸钴微纳米材料。因此，本项目主要研究以醇辅助铁系磷酸盐微纳米材料的合成为基础，简单探索了醇对铁系磷酸盐微纳米材料生长机理，寻找此类材料微纳米化后形成的新表界面对电化学储能性能的影响和其构效关系的内在原因，然后通过合理工艺优化，组装成高性能电化学储能器件，最终为得到有应用前景的电化学储能材料提供可靠的理论依据。