摘要
对尖晶石型LiMn2O4表面进行Al2O3包覆,并对其材料结构和电化学性能进行研究.结果表明,Al2O3包覆可有效降低Jahn-Teller畸变,提高电化学性能.当Al的包覆量为3.0%时,材料的放电比容量与循环性能达到最佳,首次放电比容量为113.5 mAh/g,20次循环后,比容量衰减至87.6 mAh/g,容量保持率为77.2%.
Al2O3 was coated on spinel-type LiMn2O4. The structure and electrochemical properties of the material were studied. The results showed that Al2O3 coating can reduce Jahn-Teller distortion, improve electric chemical property. Discharge capacity and cyclic stability of the material were best when Al account for 3.0% of LiMn204. The initial discharge specific capacity was 113.5 mAh/g, after 20 cycles, specific capacity was 87.6 mAh/g. The capacity retained 77.2%.
出处
《郑州轻工业学院学报（自然科学版）》
CAS
2007年第5期4-7,共4页
Journal of Zhengzhou University of Light Industry:Natural Science
基金
河南省科技攻关项目(0424210024)
