Diffusional mechanism of deintercalation in LiFe1 − yMnyPO4 cathode material |
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| Institution: | 1. Dep. of Chemistry, NanoQAM, Université du Québec à Montréal, Quebec Centre for Functional Materials, Case Postale 8888 Succ. Centre-ville, Montréal, Québec H3C 3P8, Canada;2. Johnson Matthey Battery Materials Ltd, 280 Ave. Liberté, Candiac, Québec J5R 6X1, Canada |
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| Abstract: | The paper presents the investigations on the structural, electrical and electrochemical properties of Mn substituted phospho-olivines LiFe1 − yMnyPO4 and of W, Ti or Al doped LiFePO4. The microscopic nature of the observed macroscopic, metallic-like conductivity of W, Ti, Al doped phospho-olivine samples is discussed. Some fundamental arguments against the bulk type conductivity are presented.A single phase, diffusional mechanism of deintercalation was found to appear for Mn-substituted LiFe1 − yMnyPO4 samples in the whole range of lithium concentration, in contrast to the pure LiFePO4, LiMnPO4 and W, Ti, Al doped phospho-olivines, where a two-phase mechanism of electrochemical lithium extraction/insertion is observed. |
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