基于化学共沉淀的两步法合成LiMnPO_4正极材料研究进展

磷酸锰锂(LiMnPO_4)是一种非常有应用前景的锂离子电池正极材料,化学共沉淀法是制备这种材料的理想方法。针对LiMnPO_4正极材料目前研究过程中存在的电子电导率低和锂离子扩散慢等问题,本文从Mn_3(PO_4)_2、MnPO_4、NH_4MnPO_4等不同Mn-P前驱体合成LiMnPO_4出发,综述了近年来基于化学共沉淀工艺的两步法合成LiMnPO_4正极材料并采用碳包覆和离子掺杂两种手段改性的国内外研究进展。对当前研究过程中存在的不同Mn-P前驱体获得LiMnPO_4产品性能差异的问题,认为应该通过进一步地探讨化学共沉淀过程的反应机理并进行相关反应动力学及热力学研究解决。本文为LiMnPO_4正极材料的研究及产业化提供了参考。

Research progress in chemical co-precipitation based synthesis of LiMnPO4 cathode material by two steps

LiMnPO₄ has the potential applications as a cathode material for lithium-ion batteries， and chemical co-precipitation is an ideal method to prepare LiMnPO₄. There have been problems, such as the low conductivity and low Li⁺ diffusion, lying in the recent studies of LiMnPO₄ cathode materials. According to these problems,this paper, starting from the synthesis of LiMnPO₄ using Mn₃(PO₄)₂、MnPO₄、NH₄MnPO₄ and other different kinds of Mn-P precursors, summarized the recent research progresses at home and abroad in LiMnPO₄ prepared by chemical co-precipitation of two step method, in which carbon coating and metal ion doping were usual modification methods. Aiming at the existing problems in recent researches that LiMnPO₄ with different properties can be obtained from different kinds of Mn-P precursors, it was considered that the mechanism of chemical co-precipitation should be further discussed and the related kinetics and thermodynamics study should be carried on. This paper provides references for the further study of LiMnPO₄ cathode materials and its industrialization.