Sn/C composites as anode material for lithium ion battery
Ning Linjian; Wang Lingzhi; Fang Shibi
AbstractIn order to improve the cycle stabilities of tin based anode materials and keep their high capacities, Sn/C composites with different carbon contents were prepared by disperse polymerization and pyrolysis of poly(para-divinyl benzene)-encapsulated tin dioxide nanoparticles. The morphologies of Sn/C composites were analyzed by means of transmission electron microscope (TEM) and powder X-ray diffraction (XRD). Tin-based particles (about 100 nm) can be uniformly distributed in carbon matrix when the carbon content in composite exceeded 50 wt%. With the decrease of carbon content, the aggregation of tin oxides became serious for no enough carbon as barrier, and the diameter of tin based particles increased. Dining the pyrolysis Of poly( par-a-divinyl benzene), pail of Silo, was reduced into metallic tin and SnO, and as the carbon content in composite increased, the degree of reduction increased. The electrochemical performances of Sn/C composites as electrodes were compared. Electrochemical performances of the Sn/C composite depended oil morphologies of tin and carbon phases. The reversible capacities of Sn/C composites increased with the decrease of carbon content because the pyrolyzed carbon showed a low reversible capacity. Oil the Other hand, the cycle ability Of Sn/C composites increased as the carbon content increased because the carbon effectively suppressed the sintering agglomeration of tin based material and maintained the electrical conductivity of composites. Further, the morphologies of electrodes were analyzed by SEM and XRD. With the increase of carbon content, the electrochemical sinter of tin based material in electrode wits inhibited. The different morphologies of various electrodes were consistent with their different cycle performances. According to the analysis results of morphologies and properties of Sn/C composites, stable electrochemical performances of the Sn/C composites call Only be achieved by homogeneous dispersion of the tin-based particles in carbon matrix so Lis to avoid aggregation of tin and its pulverization and to keep conductivity of the Sn/C composites.
KeywordLithium Ion Battery Anode Composite Tin Electric Performance
Indexed BySCI
WOS IDWOS:000259615200015
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorNing Linjian
AffiliationChinese Acad Sci, Inst Chem, Key Lab Phytochem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Ning Linjian,Wang Lingzhi,Fang Shibi. Sn/C composites as anode material for lithium ion battery[J]. ACTA POLYMERICA SINICA,2008(9):915-919.
APA Ning Linjian,Wang Lingzhi,&Fang Shibi.(2008).Sn/C composites as anode material for lithium ion battery.ACTA POLYMERICA SINICA(9),915-919.
MLA Ning Linjian,et al."Sn/C composites as anode material for lithium ion battery".ACTA POLYMERICA SINICA .9(2008):915-919.
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