摘要
用具有高比表面积的TiO2纳米带改性尖晶石型LiMn2O4,以提高其电化学性能和循环使用寿命。用X射线衍射仪、热分析仪、扫描电子显微镜和电池性能测试系统对产物的组成、热稳定性、微观形貌和充放电性能进行表征。结果表明:TiO2纳米带均匀分散在尖晶石LiMn2O4中,而LiMn2O4的晶体结构并未发生变化;充放电性能测试表明,当TiO2纳米带的加入量为2.0wt%时,改性LiMn2O4具有较高的放电比容量及循环容量保持率,0.5C倍率下首次放电比容量为136mAh/g,50次循环后容量保持率为93.3%;TG-DSC数据研究表明,改性LiMn2O4电极的热稳定性有所提高。
The surface of spinel LiMn2O4 was modified with TiO2 nanobelts with high specific area to improve its electrochemical performance. The morphology and structure of the numodificated and TiO2 modificated LiMn2O4 samples were characterized by XRD, SEM and TG--DSC. It was found that TiO2 nanobelts are uniformly distributed in LiMn2 O4. The crystal structure of LiMn2 O4 is not af- fected by the TiO2 modificating. Electrochemical test shows that. The first discharge quality capacity of 2.0wt% TiO2 modified LiMn2O4 was 136 mAh/g and the capacity retention was more than 93.3% after 50 cycles at high potential cycles between 3.0 and 4.5V at room temperature at 0.5C charge-- discharge rate. Data from TG--DSC studies show that the thermal stability of the modified LiMn2O4 electrode is improved.
出处
《山东陶瓷》
CAS
2013年第6期9-13,共5页
Shandong Ceramics
