三氧化二铝包覆锂离子电池用尖晶石锰酸锂

Coating spinel lithium manganese oxide with aluminum oxide for Li-ion battery

用液相浸渍法在尖晶石LiMn2O4表面包覆Al2O3薄膜，对包覆后的尖晶石LiMn2O4进行理化性能及电化学性能分析。Al2O3包覆层减少了尖晶石LiMn2O4与电解液的直接接触，减少了电解液对正极材料的侵蚀，改善了LiMn2O4的循环性能。以1C在2．75～4．20V循环250次，容量保持率由包覆前的85．3％提高到包覆后的90.7％。

A uniform aluminum oxide （Al2O3 ） film was coated on the surface of the spinel lithium manganese oxide （LiMn2O4） cathode particles for Li-ion battery via liquid immersion method, the physicochemical and electrochemical performance of the surface-modified spinel LiMn2O4 were analyzed. The Al2O3 surface fdm could reduce the direct contact of the spinel LiMn2O4 particles with the electrolyte, reduce the corrosion of electrolyte to the cathode material, thus improve the cycle ability of the spinel LiMn2O4. The capacity retention of the Al2O3-coated LiMn204 was increased from 85.3% to 90.7%, compared with that of the uncoated LiMn2O4 after 250 cycles at 1 C in 2.75 -4.20 V.