Crystal structure, phase relations and electrochemical properties of monoclinic Li{sub 2}MnSiO{sub 4}
- Chemistry Faculty, Rostov State University, 7 ul. Zorge, Rostov-na-Donu 344090 (Russian Federation)
Phase relations in the MnO-SiO{sub 2}-Li{sub 4}SiO{sub 4} subsystem have been investigated by X-ray diffraction after solid-state reactions in hydrogen at 950-1150 deg. C. Both cation-deficient and cation-excess solid solutions Li{sub 2+2} {sub x} Mn{sub 1-} {sub x} SiO{sub 4} (-0.2{<=}x{<=}0.2) based on Li{sub 2}MnSiO{sub 4} have been found. According to Rietveld analysis, Li{sub 2}MnSiO{sub 4} (monoclinic, P2{sub 1}/n, a=6.3368(1), b=10.9146(2), c=5.0730(1) A, {beta}=90.987(1){sup o}) is isostructural with {gamma} {sub II}-Li{sub 2}ZnSiO{sub 4} and low-temperature Li{sub 2}MgSiO{sub 4}. All components are in tetrahedral environment, (MnSiO{sub 4}){sup 2-} framework is built of four-, six- and eight-member rings of tetrahedra. Testing Li{sub 2}MnSiO{sub 4} in an electrochemical cell showed that only 4% Li could be extracted between 3.5 and 5 V against Li metal. These results are discussed in comparison with those for recently reported orthorhombic layered Li{sub 2}MnSiO{sub 4} and other tetrahedral Li{sub 2} MXO{sub 4} phases. - Graphical abstract: Arrangement of Mn (large white balls) and Si (small grey balls) atoms in Li{sub 2}MnSiO{sub 4} structure. Bold lines connect atoms linked via common oxygen (not shown)
- OSTI ID:
- 21015745
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 3; Other Information: DOI: 10.1016/j.jssc.2007.01.001; PII: S0022-4596(07)00015-1; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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