原料粒度对固相合成锰酸锂正极电化学性能研究

Study on the particle size of raw materials to the electrochemical performance of solid-phase synthesis of lithium manganate cathode

近年来锂离子电池飞速发展已被广泛应用于便携式电子设备、新能源汽车和储能等领域。具有三维通道的尖晶石LiMn2O4材料由于其丰富的资源、低廉的价格和环境友好性,被认为是锂离子电池理想的正极材料。材料的形貌和尺寸决定了其物理化学性能,文中研究了不同粒度MnO2原材料固相合成LiMn2O4材料及其电化学性能。研究结果表明原料粒径最小合成的LiMn2O4正极具有最佳的电化学性能,在0.2 C倍率下,首次放电比容量达到141 mAh/g,在1 C倍率下,循环100次,容量保持率为80.9%。

In recent years,the rapid development of lithium-ion batteries has been widely used in portable electronic devices,new energy vehicles and energy storage.The spinel LiMn2O4 material with three-dimensional channels is considered to be an ideal cathode material for lithium-ion batteries due to it’s rich resources,low price,and environmental friendliness.The morphology and size of the material determine it’s physical and chemical properties.This paper studies the solid-phase synthesis of LiMn2O4 materials with different particle sizes of MnO2 raw materials and their electrochemical properties.The results show that the synthesized LiMn2O4 cathode with the smallest raw material particle size has the best electrochemical performance.At 0.2 C rate,the initial discharge specific capacity reaches 141 mAh/g,at 1 C rate,the capacity retention rate is 80.9% after 100 cycles.