水热/溶剂热法制备锂电池负极材料碳气凝胶/Fe_2O_3及其电化学性能  

Synthesis and Electrochemical Performance of Carbon Aerogel/Fe_2O_3 Composite by Hydrothermal/Solvothermal Method as an Anode Material for Li-ion Batteries

作　　者：罗大为[1] 林峰[1] 栾崇林[1] 陈进洪 陈佳明[1] 李雪 

机构地区：[1]深圳职业技术学院,深圳518055 [2]深圳市超材料制备与封装技术重点实验室,深圳518055

出　　处：《人工晶体学报》2017年第4期733-738,共6页Journal of Synthetic Crystals

基　　金：深圳市科技计划项目(JCYJ20160523113743114);广东省自然科学基金(2016A030313847)

摘　　要：采用水热/溶剂热法,通过在碳气凝胶(CA)表面负载纳米Fe_2O_3颗粒,制备了具有不同外观形貌的CA/Fe_2O_3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、Fe_2O_3及CA/Fe_2O_3的结构、形貌和Fe_2O_3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Fe_2O_3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/Fe_2O_3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%。Nanostructure CA/F2O3 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.

关 键 词：锂电池 负极 水热/溶剂热法 碳气凝胶 氧化铁 

分 类 号：TM912[电气工程—电力电子与电力传动]