摘要
针对α-Fe2O3负极在充放电过程中存在的体积膨胀及首次库伦效率低等主要问题，本文采用简单的水热法制备出具有三维多孔结构的α-Fe2O3/掺氮石墨烯（N-GNS）/碳纳米管（CNTs）复合材料。XRD，SEM，TEM及XPS等测试结果表明碳纳米管成功插入到掺氮石墨烯片层间，暴露N-GNS表面的晶格缺陷，为α-Fe2O3晶体生长提供了大量成核位点。粒径大小为30~70 nm的α-Fe2O3颗粒均匀锚定于N-GNS/CNTs三维复合碳载体内进行高效储锂反应。电化学测试结果显示，这种三维复合结构有效改善了α-Fe2O3/GNS负极的电化学性能。
To solve the main obstacles associated with the charge-discharge process of α-Fe2O3 anode, such as serious volume expansion and low initial coulombic efficiency, 3D porous α-Fe2O3/nitrogen-doped graphene（N-GNS）/carbon nanotubes（CNTs） nanocomposites were synthesized via a facile hydrothermal method. The nanocomposites were characterized by XRD, SEM, TEM and XPS measurements and the results indicated that CNTs were successfully inserted into the interlamination between N-GNS, providing more defects than pristine GNS for α-Fe2O3 nucleating and the lithium ion storage. α-Fe2O3 nanoparticles with an average size of 30~70 nm were uniformly anchored in 3D N-GNS/CNTs carbon matrix and reacted with lithium ion efficiently. The electrochemical test results showed that this 3D composite structure can significantly improve the electrochemical performance of α-Fe2O3/GNS anode.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2014年第2期242-250,共9页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.21103090)
中央高校基本科研业务费专项资金(No.NS2012109)资助项目
