New high voltage and high capacity storage systems are needed to sustain the increasing energy demand set by the portable electronics and automotive fi elds. Due to their good electrochemical performance, lithium-transition metal-phosphates (LiMPO 4) seem to be very attractive as cathode materials for lithium secondary batteries. Here the synthesis and the characterization of fi ve high voltage cathodes for lithium batteries, based on lithium–iron, lithium–nickel, lithium–cobalt phosphates are described. The effect of dif-fering degrees of cobalt and nickel doping on structure, morphology, and the electrochemical properties of the different materials is thoroughly studied. Transition metal atoms in these materials are found to be vicariant within the olivine crystal structure; however, the lattice parameters and cell volume can be modulated by varying the nickel/cobalt ratio during the synthesis. High performance battery prototypes in terms of voltage (>4.0 V), specifi c capacity (125 mAh g −1), specifi c energy (560 mWh g −1), and cyclic life (>150 cycles) are also demonstrated.

High-Performance Olivine for Lithium Batteries: Effects of Ni/Co Doping on the Properties of LiFe alpha Ni beta Co gamma PO4 Cathodes

POLIZZI, Stefano;
2015-01-01

Abstract

New high voltage and high capacity storage systems are needed to sustain the increasing energy demand set by the portable electronics and automotive fi elds. Due to their good electrochemical performance, lithium-transition metal-phosphates (LiMPO 4) seem to be very attractive as cathode materials for lithium secondary batteries. Here the synthesis and the characterization of fi ve high voltage cathodes for lithium batteries, based on lithium–iron, lithium–nickel, lithium–cobalt phosphates are described. The effect of dif-fering degrees of cobalt and nickel doping on structure, morphology, and the electrochemical properties of the different materials is thoroughly studied. Transition metal atoms in these materials are found to be vicariant within the olivine crystal structure; however, the lattice parameters and cell volume can be modulated by varying the nickel/cobalt ratio during the synthesis. High performance battery prototypes in terms of voltage (>4.0 V), specifi c capacity (125 mAh g −1), specifi c energy (560 mWh g −1), and cyclic life (>150 cycles) are also demonstrated.
File in questo prodotto:
File Dimensione Formato  
2015_AdvFunctMater.pdf

non disponibili

Descrizione: Articolo principale
Tipologia: Versione dell'editore
Licenza: Accesso chiuso-personale
Dimensione 1.39 MB
Formato Adobe PDF
1.39 MB Adobe PDF   Visualizza/Apri

I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/3659855
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 28
  • ???jsp.display-item.citation.isi??? 27
social impact