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Features of the electrochemical lithium insertion into monophosphate tungsten bronzes (PO2)4(WO3)2m (m=9 and 10) |
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| Authors: | A. Martí nez-de la Cruz,F.E. Longoria Rodrí guez |
| Affiliation: | aDivisión de Estudios de Posgrado, Facultad de Ingeniería Mecánica y Eléctrica, Universidad Autónoma de Nuevo León, Pedro de Alba s/n, Ciudad Universitaria, C.P. 66451 San Nicolás de los Garza, N.L., Mexico bDepartamento de Química, Unidad de Cursos Básicos, Núcleo Monagas, UDO. Av. Universidad Los Guaritos, Maturín, Monagas, Venezuela |
| Abstract: | Electrochemical lithium insertion into (PO2)4(WO3)2m, where m=9 and 10, has allowed the determination of several phases Lix(PO2)4(WO3)2m between 3.4 and 0.01 V vs Li+/Li0. After the first cycle the electrochemical system was unable to maintain the high specific capacity of the cells (540 Ah/kg) due to irreversible processes. Nevertheless at high voltage values, above 1.4 V vs Li+/Li0, the lithium insertion proceeded through a reversible mechanism. By means of X-ray diffraction experiments we have detected the nature of different phases Lix(PO2)4(WO3)2m formed and we have established a correlation with the reversible/irreversible processes detected during the electrochemical insertion. |
| Keywords: | A. Oxides C. X-ray diffraction D. Electrochemical properties |
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