Effect on Electrochemical Performance of Different Ratio of Al2O3 Coating LiMn2O4 Cathode Material
Abstract: In order to improve the cycle performance of LiMn2O4 cathode materials, we synthesize Al2O3 coating LiMn2O4 cathode materials by sol-gel method using Al (NO3)3•9H2O and LiMn2O4 as starting materials. Effects on structure and electrochemical performance of Al2O3 coating LiMn2O4 cathode materials at different ratio have been researched. The crystal structure and morphology of mate-rials were characterized using X-ray diffraction (XRD) and scanning electron microscope (SEM); And the electrochemical performance was tested by cyclic voltammetry and cycling experiment. XRD and SEM results show that the coating is only on the surface of LiMn2O4 and it does not affect crystal structure of LiMn2O4. Electrochemical tests show that 1% Al2O3coating sample has an excellent electrochemical performance; the capacity retention is 96.96% at 1 C rate after 200 cycles when capacity retention of the uncoated LiMn2O4 is 52.78%.
文章引用: 刘国壮 , 赖飞燕 , 杨 辉 , 黄有国 , 王红强 , 李庆余 (2017) 氧化铝包覆量对锰酸锂正极材料电化学性能的影响。 材料科学， 7， 648-654. doi: 10.12677/MS.2017.77086
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