Crystal structure, phase relations and electrochemical properties of monoclinic Li2MnSiO4

被引：158

作者：

Politaev, V. V. ^{[1
]}

Petrenko, A. A. ^{[1
]}

Nalbandyan, V. B. ^{[1
]}

Medvedev, B. S. ^{[1
]}

Shvetsova, E. S. ^{[1
]}

机构：

[1] Rostov State Univ, Fac Chem, Rostov Na Donu 344090, Russia

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2007年 / 180卷 / 03期

关键词：

lithium manganese silicium oxide; X-ray diffraction; phase relations; Rietveld refinement; solid solutions; superstructure;

D O I：

10.1016/j.jssc.2007.01.001

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Phase relations in the MnO-SiO2-Li4SiO4 subsystem have been investigated by X-ray diffraction after solid-state reactions in hydrogen at 950-1150 degrees C. Both cation-deficient and cation-excess solid solutions Li2+2xMn1-xSiO4 (-0.2 <= x <= 0.2) based on Li2MnSiO4 have been found. According to Rietveld analysis, Li2MnSiO4 (monoclinic, P2(1)/n, a = 6.3368(1), b = 10.9146(2), c = 5.0730(1) angstrom, beta = 90.987(1)degrees) is isostructural with gamma(II)-Li2ZnSiO4 and low-temperature Li2MgSiO4. All components are in tetrahedral environment, (MnSiO4)(2-) framework is built of four-, six- and eight-member rings of tetrahedra. Testing Li2MnSiO4 in an electrochemical cell showed that only 4% Li could be extracted between 3.5 and 5V against Li metal. These results are discussed in comparison with those for recently reported orthorhombic layered Li2MnSiO4 and other tetrahedral Li2MnSiO4 phases. (c) 2007 Elsevier Inc. All rights reserved.

引用

页码：1045 / 1050

页数：6

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