【摘要】 首次以异丙醇铝为原料,采用溶胶凝胶法在LiCo0.05Mn1.95O4表面包覆了一层稳定的Al2O3膜。用X射线衍射、扫描电镜及其能谱对包覆前后LiCo0.05Mn1.95O4的结构进行了表征,并测试了样品在常温(25 ℃)和高温(55 ℃)时的电化学性能。研究表明,经Al2O3包覆处理后的LiCo0.05Mn1.95O4有效抑制了LiCo0.05Mn1.95O4与电解液之间的恶性相互作用,降低了Mn的溶解,稳定了LiCo0.05Mn1.95O4的结构,改善了LiCo0.05Mn1.95O4的循环性能。并研究了Al2O3不同包覆量对LiCo0.05Mn1.95O4电化学性能的影响,以Al2O3包覆量为0.5 %(质量百分数)的CAl0.5样品的循环性能较优。更多还原

【Abstract】 It was firstly reported that the stable Al2O3 film was coated on the surface of LiCo0.05Mn1.95O4 cathode material for lithium-ion batteries by sol-gel method with Al(C3H7O)3. The structure of the uncoated and coated LiCo0.05Mn1.95O4 was characterized by XRD, SEM and energy spectroscopy. Charge-discharge performance of the uncoated and coated LiCo0.05Mn1.95O4 was tested at room temperature (25 ℃) and elevated temperature (55 ℃). Results show that the Al2O3 film can prevent solution of Mn, and reduce the harmful interaction between the LiCo0.05Mn1.95O4 active cathode material and electrolyte, stabilized the structure of LiCo0.05Mn1.95O4 , so the coated LiCo0.05Mn1.95O4 posses an excellent performance at room temperature and high temperature compared to uncoated. The effect of Al2O3 content in coating on the electrochemical properties of LiCo0.05Mn1.95O4 was also studied, the sample CAl0.5 of coated with 0.5%(mass percentage) Al2O3 exhibited excellent cycle properties.更多还原