Application of the "confusion principle" to Sn-based materials as negative electrode materials for Li-ion batteries

作者：Ferguson P P; Dahn J R^*

来源：Canadian Journal of Physics, 2010, 88(2): 131-135.

DOI：10.1139/P10-005

The "confusion principle" (Greer. Nature, 366, 303 (1993)) is applied to tin-3d transition metals carbon alloys to obtain a nanostructured negative electrode material. Various Sn-TMs-C samples with TMs = Ti, V. Cr, Mn, Fe, Co, Ni, and Cu (all included with same atomic ratios) were prepared by mechanical milling and by mechanical alloying. Each 10-component alloy sample was examined structurally using X-ray diffraction (XRD) and electrochemically using Li/Sn-TM-C cells. The sample Sn(10)TMs(80)C(10) showed a nanostructured or amorphous-type XRD pattern, which shows the validity of this principle. XRD patterns of samples prepared with higher Sn atomic content showed crystalline features of Sn-based intermetallics. As expected, a very low specific capacity (<< 100 mAh/g) was observed for the sample Sm(10)TMs(80)C(10) The sample Sn(30)TMs(30)C(40) had the highest specific capacity (near 400 mAh/g) of the samples prepared. However, features of Sn aggregation were noticed at cycle number 80 of the latter sample, which are normally detrimental to the capacity retention upon further cycling.

• 出版日期2010-2