Szczegóły publikacji
Opis bibliograficzny
Electrical conductivity and reaction with lithium of $LiFe_{1-y}Mn_{y}PO{4}$ olivine-type cathode materials : short communication / J. MOLENDA, W. OJCZYK, J. MARZEC // Journal of Power Sources ; ISSN 0378-7753. — 2007 — vol. 174 iss. 2, s. 689–694. — Bibliogr. s. 694, Abstr. — Publikacja dostępna online od: 2007-07-03. — 13th international meeting on Lithium batteries : Biarritz, France, June 18–23, 2006
Autorzy (3)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 37013 |
|---|---|
| Data dodania do BaDAP | 2008-02-04 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jpowsour.2007.06.238 |
| Rok publikacji | 2007 |
| Typ publikacji | referat w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Power Sources |
Abstract
Structural, electrical and electrochemical properties of Mn-substituted phospho-olivines LiFe(1-y)Mn(y)PO(4) were investigated and compared to those of LiFePO(4). Rietvield refined XRD patterns taken in the course of delithiation process showed apparent difference between phase compositions of these cathode materials upon lithium extraction. Contrary to the LiFePO(4) and LiMnPO(4) compositions for which a two-phase mechanism of electrochemical lithium extraction/insertion is observed, in case of Mn-substituted LiF(1-y)Mn(y)PO(4) samples a single-phase mechanism of deintercalation was observed in the studied range of lithium concentration. Electrochemical characterization of the cathode materials were performed in Li/Li(+)/Li(x)Fe(1-y)Mn(y)PO(4)-type cells for y = 0.0, 0.25, 0.55, 0.75 and 1.0 compositions. Voltammery studies showed low reversibility of the lithium extraction process in the high-voltage "manganese" range, while in the "iron" range the reversibility of lithium extraction is high. Impedance measurements of the LiFe(1-y)Mn(y)PO(4) cathode materials, which enabled separation of the ionic and electronic components of their entire electrical conductivity, showed distinct influence of Mn content on the electronic part of conductivity. EIS measurements performed at different states of cell charge revealed that the charge-transfer impedance in Li(x)Fe(1-y)Mn(y)PO(4) is much lower than that of Li(x)FePO(4). (C) 2007 Elsevier B.V. All rights reserved.
