锂离子电池Si_(1.77)Co_(0.6)Cr_(0.6)Al_(0.3)/MGS复合负极材料的制备与性能  

Electrochemical Properties of Si_(1.77)Co_(0.6)Cr_(0.6)Al_(0.3)/MGS as Anode Material for Li-ion Batteries

作　　者：李明齐[1] 蒲红玉[1] 

机构地区：[1]西华师范大学化学化工学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2010年第3期275-279,共5页Journal of China West Normal University(Natural Sciences)

基　　金：国家科技部重大项目(2006CB932703);四川省教育厅项目(09ZB090)

摘　　要：以Si、Co、Cr、Al和改性石墨球(MGS)为前驱体通过高能球磨法制备了Si1.77Co0.6Cr0.6Al0.3/MGS复合材料.用X射线衍射(XRD)和扫描电镜(SEM)表征了复合材料的组成和形貌结构.用恒电流充放电和循环伏安测试了材料的电化学性能.结果表明,Si1.77Co0.6Cr0.6Al0.3/MGS复合材料有较好的电化学性能:最高可逆容量达495 mAhg-1,60个循环后,首次可逆容量的保持率为88%.Si1.77Co0.6Cr0.6Al0.3/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 Si1.77Co0.6Cr0.6Al0.3/MGS was prepared by high energy ball milling（HEBM） using nano-Si,Co,Cr,A1 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）.Constant current charge-discharge technique and cyclic voltammograms（CV） were employed to investigate the electrochemical behaviors of Si1.77Co0.6Cr0.6Al0.3/MGS.The result shows that the electrochemical performance of Si1.77Co0.6Cr0.6Al0.3/MGS is significantly improved.The highest reversible capacity of Si1.77Co0.6Cr0.6Al0.3/MGS is 495 mAh g-1.The first revesible capacity retention is 88 % after 60 cycles.The improvement of Si1.77Co0.6Cr0.6Al0.3/MGS in electrochemical performance mainly comes from the stability of electrode structure.

关 键 词：Si1.77Co0.6Cr0.6Al0.3/MGS 复合材料 负极 锂离子电池 电化学性能 

分 类 号：TB33[一般工业技术—材料科学与工程]