【作者】 周小四； 刘霞； 徐艳； 刘云霞；

【Author】 Xiaosi Zhou;Xia Liu;Yan Xu;Yunxia Liu;School of Chemistry and Materials Science,Nanjing Normal University;

【机构】 南京师范大学；

【摘要】 锑作为钠离子电池负极材料由于其高比容量(660 mA h g-1)而受到广泛关注,但在脱-嵌钠过程中存在巨大的体积变化而最终导致容量的快速衰退[1,2]。本文通过湿法球磨制备出SbOx/石墨烯杂化物,它在作为钠离子电池负极材料时表现出优异的倍率性能(电流密度为5 A g-1容量为352 mA h g-1)和稳定的循环性能(电流密度为1 A g-1循环100圈后容量为409 mA h g-1)。分析表明SbOx与石墨烯之间形成的Sb-O键能缩短电子从石墨烯到SbOx的传输距离,并抑制循环过程中锑的聚集。更多还原

【Abstract】 Antimony(Sb) has attracted great interest as anodes materials for sodium-ion batteries(SIBs) owing to its high theoretical capacity(660 mA h g-1).However,Sb suffers from large volume change during sodium insertion/extraction process,leading to rapid capacity deterioration with cycling.In this work,we synthesized SbOx/reduced graphene oxide(SbOx/RGO) hybrids through a wet-milling approach.The as-fabricated hybrids demonstrate superior rate capability(352 mA h g-1 under 5 A g-1) and stable cycling performance(409 mA h g-1 after 100 cycles under 1 A g-1) when tested as anode materials for SIBs.The excellent electrochemical performance of SbOx/RGO are benefited from the Sb-O bonding between SbOx and graphene sheets,nanometer-sized SbOx particles,and the high conductive graphene,which not only boost the fast electron transport from highly conductive graphene network to SbOx,but effectively confine SbOx nanoparticles to avoid the aggregation of Sb particles during cycling.更多还原