溶剂热反应时间对磷酸锰铁锂复合正极的结构和性能研究

Study on the Structure and Electrochemical Performance of Lithium Manganese Iron Phosphate Composite Cathode by Solvothermal Reaction Times

磷酸锰锂材料因其电子电导率低和电极动力学性能差而严重限制了其进一步大规模应用。本文使用溶剂热反应来制备LiMn0.8Fe0.2PO4/C材料,探讨溶剂热反应的时间对该材料结构、形貌和电化学性能的影响。结果表明,当溶剂热反应时间为18 h时,样品L-18h具有良好结晶度,LiMn0.8Fe0.2PO4/C纳米颗粒形貌规整,晶粒尺寸均匀,表现出优异的可逆性能和倍率性能,电子电导率得到明显提升。因此,通过调控溶剂热反应时间,可以优化电池的电化学性能和反应动力学性能。该研究为促进锂离子电池正极材料的实际应用提供理论指导与实验依据。

Lithium manganese phosphate is severely limited for further large-scale applications due to their low electronic conductivity and poor electrode kinetics. Herein, a solvothermal reaction is used to prepare LiMn0.8Fe0.2PO4/C materials to investigate the effects of the solvothermal reaction times on the structure, morphology and electrochemical performance. It shows that the solvent heat reaction time is 18 h, L-18h has good crystallinity, the LiMn0.8Fe0.2PO4/C nanoparticles have regular morphology and uniform grain size, exhibiting excellent reversibility and multiplicity property, and the electronic conductivity has been significantly enhanced. Therefore, the electrochemical and reaction kinetic properties of the battery can be optimized by modulating the solvothermal reaction time. This work provides theoretical guidance and experimental basis to promote the practical application of cathode materials for lithium-ion batteries.