摘要
以Si、Co、B、Zn和改性石墨球(MGS)为前驱体通过高能球磨制备了一种新的锂离子电池复合负极材料(Si1.18Co0.6B0.6Zn0.12/MGS)。用X射线衍射(XRD)和扫描电镜(SEM)表征了材料的组成和形貌结构。恒电流充放电测试表明,Si1.18Co0.6B0.6Zn0.12/MGS复合材料有较好的电化学性能,最高可逆比容量达565mAh/g,50个循环后,首次可逆容量的保持率为94%。Si1.18Co0.6B0.6Zn0.12/MGS电化学性能的改善应归因于电极结构在循环过程中的稳定性。
New Si1.18Co0.6B0.6Zn0.12/MGS was prepared by high energy ball milling (HEBM) using nano-Si, Co, B, Zn and modified graphite sphere (MGS) as precursors. The compositions and morphology of the composite material were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The constant current charge-discharge technique indicates that Si1.18Co0.6B0.6Zn0.12/MGS exhibits obviously improved cyclic performance. The highest reversible capacity of Si1.18Co0.6B0.6Zn0.12/MGS is 565 mAh/g. The first reversible capacity retention is 94% in the tested 50 cycles. The improvement of Si1.18Co0.6B0.6Zn0.12/MGS in electrochemical performance mainly comes from the stability of electrode structure.
出处
《电源技术》
CAS
CSCD
北大核心
2010年第6期543-545,共3页
Chinese Journal of Power Sources
基金
四川省教育厅项目(09ZB090)
西华师大启动项目(09B005)
作者简介
作者简介:李明齐(1970—),男,四川省人,副教授,博士。主要研究方向为电化学。