液相共沉淀法制备磷酸锰铁前驱体工艺研究及应用

Research and Application of Liquid-Phase Co-Precipitation Method for Preparing Precursor of Manganese Iron Phosphate

摘要: 本文针对磷酸锰铁锂(LMFP)正极材料磷酸锰铁前驱体制备中锰铁原子级均匀共沉淀的问题，采用液相共沉淀法，通过调控反应参数(pH、温度、陈化时间等)，实现了锰铁元素在原子级尺度的均匀分布。通过XRD、SEM、BET等表征手段，揭示了前驱体结晶度、形貌与电化学性能的关联机制。制备的LMFP正极材料在0.1C下比容量达158 mAh/g，1C循环200次后容量保持率95.3%，显著优于传统工艺。

Abstract: This article addresses the issue of uniform co precipitation of manganese iron at the atomic level in the preparation of lithium manganese iron phosphate (LMFP) cathode material precursors. The liquid-phase co precipitation method is used to achieve uniform distribution of manganese iron elements at the atomic level by adjusting reaction parameters such as pH, temperature, and aging time. The correlation mechanism between precursor crystallinity, morphology, and electrochemical performance was revealed through characterization methods such as XRD, SEM, BET, etc. The prepared LMFP positive electrode material has a specific capacity of 158 mAh/g at 0.1C and a capacity retention rate of 95.3% after 200 cycles at 1C, significantly better than traditional processes.