The influence of iron substitution on the electrochemical properties of Li1+xTi2-xFex(PO4)3/C composites as electrodes for lithium batteries

被引：30

作者：

Vidal-Abarca, C. ^{[1
]}

Lavela, P. ^{[1
]}

Aragon, M. J. ^{[1
]}

Plylahan, N. ^{[1
]}

Tirado, J. L. ^{[1
]}

机构：

[1] Univ Cordoba, Lab Quim Inorgan, E-14071 Cordoba, Spain

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 40期

关键词：

INTERCALATION ELECTRODE; NEUTRON-DIFFRACTION; CRYSTAL-CHEMISTRY; ION BATTERIES; INSERTION; NASICON; PHASE; DISORDER; CATHODES;

D O I：

10.1039/c2jm34227h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The Li1+xTi2-xFex(PO4)(3)/C series with 0 <= 5 <= 0.4 was prepared by a sol-gel method. XRD patterns showed a rhombohedral phase and minor contribution of an orthorhombic phase. The local environment of the phosphate structure was analyzed by P-31 MAS NMR spectroscopy. The electrochemical lithium insertion revealed two reversible regions for Fe3+/Fe2+ and Ti4+/Ti3+ reactions as confirmed by Fe-57 Mossbauer spectroscopy. Capacity values as large as 130 mA h g(-1) were recorded for Li1.2Ti1.8Fe0.2(PO4)(3)/C after 40 cycles. The drastic decrease in capacity observed for LiTi2(PO4)(3)/C cycled at C/2 was explained in terms of a lower kinetic response at the electrode-electrolyte interphase.

引用

页码：21602 / 21607

页数：6

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