Electrochemical lithium insertion in the phosphate tungsten bronze P8W12O52

Electrochemical lithium insertion into P8W12O52 has allowed the determination of several phases LixP8W12O52 (0 < =x < =72) between 3.2 and 0.01 V vs Li+/Lio. After the first cycle the electrochemical system was unable to maintain the high specific capacity of the cell (625 A h/kg) due to irrev...

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Bibliographic Details
Published in:Solid state ionics 2005-11, Vol.176 (35-36), p.2625-2630
Main Authors: de la Cruz, A Martinez, Rodriguez, F E Longoria, Rodriguez, J Ibarra
Format: Article
Language:English
Online Access:Get full text
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Summary:Electrochemical lithium insertion into P8W12O52 has allowed the determination of several phases LixP8W12O52 (0 < =x < =72) between 3.2 and 0.01 V vs Li+/Lio. After the first cycle the electrochemical system was unable to maintain the high specific capacity of the cell (625 A h/kg) due to irreversible processes. Nevertheless at low lithium content, x < =8, the lithium insertion proceeded through a reversible mechanism. By means of in situ X-ray diffraction experiments we have detected the nature of different phases LixP8W12O52 formed and we have established a correlation with the reversible/irreversible processes detected during the electrochemical insertion. Measurements of resistivity show that upon lithium insertion the metallic pristine oxide becomes insulating.
ISSN:0167-2738
DOI:10.1016/j.ssi.2005.08.009