Mn-substituted spinel Li4Ti5O12 materials studied by multifrequency EPR spectroscopy

被引：72

作者：

Kaftelen, Hulya ^{[1
]}

Tuncer, Mustafa ^{[2
]}

Tu, Suyan ^{[3
]}

Repp, Sergei ^{[3
]}

Gocmez, Hasan ^{[2
]}

Thomann, Ralf ^{[4
]}

Weber, Stefan ^{[3
]}

Erdem, Emre ^{[3
]}

机构：

[1] Karadeniz Tech Univ, TR-61080 Trabzon, Turkey

[2] Dumlupinar Univ, Mat & Ceram Engn Dept, TR-43100 Kutahya, Turkey

[3] Univ Freiburg, Inst Phys Chem, D-79104 Freiburg, Germany

[4] Univ Freiburg, FMF, D-79104 Freiburg, Germany

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2013年 / 1卷 / 34期

关键词：

SOLID-STATE SYNTHESIS; DOPED LITHIUM TITANATE; SINGLE-CRYSTAL EPR; ANODE MATERIAL; ELECTROCHEMICAL PERFORMANCE; NANOCRYSTALLINE LI4TI5O12; ELECTRICAL-CONDUCTIVITY; FACILE SYNTHESIS; TITANIUM-SPINEL; COMPOSITE;

D O I：

10.1039/c3ta11590a

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：

In this contribution we report on the influence of Mn doping on various physical properties of Li4Ti5-xMnxO12 (x = 0, 0.005, 0.025, 0.01, 0.05, 0.075, 0.1 and 0.2). Spinel-type (space group Fd3m, a = 0.8358 nm) Li4Ti5-xMnxO12 was produced as highly uniform and polyhedral shaped powder in a size range between 200 and 400 nm. The crystal structure of Li4Ti5-xMnxO12, the morphology and the Mn-ion distribution have been investigated by X-ray diffraction (XRD) and scanning and transmission electron microscopies (SEM and TEM). The oxidation state of Mn and the conductivity behavior of Mn-substituted Li4Ti5-xMnxO12 samples have been studied using multi-frequency electron paramagnetic resonance (EPR). Mn is incorporated as Mn2+, and these ions increase the conductivity of Li4Ti5O12; a conductivity value of 0.48 x 10(-8) S cm(-1) was measured for Li4Ti5-xMnxO12 with x = 0.075, which is tenfold larger than that of undoped Li4Ti5O12.

引用

页码：9973 / 9982

页数：10

共 63 条

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