Mn₃O₄粒径和振实密度对 LiMn₂O₄正极材料电化学性能的影响

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关键词：电化学； Mn3O4 ；粒径；振实密度； LiMn2O4 中图分类号：TM912；TQ131.11 文献标识码：A DOI：10.7535/hbkd.2026yx01010

Abstract：To address the problem of rapid capacity decay of LiMn2O4 during the cycling process， Mn34 with different particle sizes and tap densities Was prepared by manganese salt method，and used as a precursor to synthesize LiMn2O4 cathode material. The effects of Mn3O4 particle size and tap density on the electrochemical performance were investigated using X-ray difraction，cyclicvoltammetry，electrochemical impedance spectroscopy，and galvanostaticcharge-dischargtests.Theresults indicate that increasing the particle size of the Mn3O4 precursor leads to a slight decrease in the initial discharge specific capacity，but significantly improvesboth cycling stabilityandrate performance.Compared with the materialderived from 6μm （20 Mn3O4 ，thecathode material prepared from 10μmMn3O4 exhibitsa 6.2% reduction in initial discharge capacity，while achieving an 8.0% increase in capacity retention after 3Oo cycles and a 25.2% improvement at 5C .Moreover，when the tap density of Mn3O4 exceeds 2.5g/cm3 ，the rate performance of the material deteriorates sharply. The LiMn2O4 sample prepared with a precursor particle size of 10μm and tap density of 2.5g/cm3 demonstrates the best overall electrochemical performance， delivering discharge specific capacities of 122.48，111.9，and 78.42mAh/g at 0.1，1，and 5C ，respectively，along with a capacity retention of 90.3% after 30O cycles. This study clarifies the influence of precursor physical properties on the electrochemical properties of LiMn2O4 ，providing basis for the synthesis of high-performance LiMn2O4 materials.

Keywords：electrochemistry； Mn3O4 ；particle size；tap density； LiMn2O4

在全球能源结构向清洁化、低碳化转型的战略背景下，锂离子电池凭借能量密度高、循环寿命长和环境友好等突出优势，已成为便携式电子设备、新能源汽车及大规模储能系统的关键储能器件[-3]。（剩余17328字）