水热/溶剂热法制备锂电池负极材料碳气凝胶/Fe2O3及其电化学性能

采用水热/溶剂热法,通过在碳气凝胶(CA)表面负载纳米Fe2O3颗粒,制备了具有不同外观形貌的CA/Fe2O3复合负极材料.通过X射线粉末衍射(XRD)、扫描电镜(SEM)和热重(TG)等测试手段表征了碳气凝胶、Fe2O3及CA/Fe2O3的结构、形貌和Fe2O3负载率,并对复合负极的电化学储锂性能进行了研究.结果表明,采用水热或溶剂热法时,在碳气凝胶表面合成的Fe2O3颗粒分别呈橄榄球状和微球状.电化学结果表明,采用溶剂热法合成的CA/Fe2O3复合材料作为锂电池负极材料具有较高的储锂容量和倍率性能,在100 mA·g-1电流密度下循环50次,可逆容量为634.9 mAh·g-1,充电容量保持率高达97.9;.

Synthesis and Electrochemical Performance of Carbon Aerogel/Fe2O3 Composite by Hydrothermal/Solvothermal Method as an Anode Material for Li-ion Batteries

Nanostructure CA/Fe2O3 composite with different morphologies were synthesized by modification of Fe2O3 on CA via a simple hydrothermal/solvothermal method.The structure, morphology and Fe2O3 loading content in CA/Fe2O3 were characterized by XRD, SEM and TGA, and the electrochemical properties of these materials were also investigated by constant current charge/discharge tests.The results shows that Fe2O3 is uniformly dispersed on CA with a rugby-like and ball-like morphology by hydrothermal/solvothermal method, respectively.Electrochemical results indicate CA/Fe2O3 obtained by solvothermal method exhibit better cycling performance and rate capability as an anode material for LIBs, and the cyclability of CA/Fe2O3 is up to 634.9 mAh·g-1 at a current density of 100 mA·g-1 after 50 cycles with a large retention of 97.9% comparing with the first capacity.