Effect of Transitional Metals (Mn and Ni) Substitution in LiCoPO4 Olivines.
Molecules
; 25(3)2020 Jan 30.
Article
em En
| MEDLINE
| ID: mdl-32019178
ABSTRACT
Transition metal substitution is a key strategy to optimize the functional properties of advanced crystalline materials used as positive electrodes in secondary lithium batteries (LIBs). Here we investigate the structural alterations in the olivine lattice of Mn and Ni substituted LiCoPO4 phase and the impact on performance in LIBs. X-ray diffraction (XRD) and extended X-ray absorption experiments have been carried out in order to highlight the structural alterations induced by partial substitution of cobalt by manganese and nickel. XRD analysis suggests that substitution induces an expansion of the lattices and an increase of the antisite disorder between lithium and transition metal ions in the structure. XAS data highlight negligible electronic disorder but a relevant modulation in the local coordination around the different metal ions. Moreover, galvanostatic tests showed poor reversibility of the redox reaction compared to the pure LCP sample, and this failure is discussed in detail in view of the observed remarkable structural changes.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Óxidos
/
Fosfatos
/
Cobalto
/
Silicatos
/
Compostos de Magnésio
/
Compostos de Ferro
/
Eletrodos
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Manganês
/
Níquel
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article