High-Voltage Cathode Materials for Lithium-Ion Batteries: Freeze-Dried LiMn0.8Fe0.1M0.1PO4/C (M = Fe, Co, Ni, Cu) Nanocomposites

TitleHigh-Voltage Cathode Materials for Lithium-Ion Batteries: Freeze-Dried LiMn0.8Fe0.1M0.1PO4/C (M = Fe, Co, Ni, Cu) Nanocomposites
Publication TypeJournal Article
Year of Publication2015
AuthorsIturrondobeitia, Amaia, Aintzane Goñi, Izaskun Gil de Muro, Luis Lezama, Chunjoong Kim, Marca M. Doeff, Jordi Cabana, and Teófilo Rojo
JournalInorganic Chemistry
Volume54
Start Page2671
Issue6
Pagination2671–2678
Date Published02/2015
ISBN Number1520-510X (Electronic) 0020-1669 (Linking)
Accession Number25723381
Abstract

Four LiMn0.8Fe0.1M0.1PO4/C (M = Fe, Co, Ni, Cu) cathode materials have been synthesized via a freeze-drying method. The samples have been characterized by powder X-ray diffraction, transmission electron microscopy, magnetic susceptibility, and electrochemical measurements. The composition and effective insertion of the transition-metal substituents in LiMnPO4 have been corroborated by elemental analysis, the evolution of the crystallographic parameters, and the magnetic properties. The morphological characterization of the composites has demonstrated that the phosphate nanoparticles are enclosed in a matrix of amorphous carbon. Among them, LiMn0.8Fe0.1Ni0.1PO4/C is the most promising cathode material, providing a good electrochemical performance in all aspects: high voltage and specific capacity values, excellent cyclability, and good rate capability. This result has been attributed to several factors, such as the suitable morphology of the sample, the good connection afforded by the in situ generated carbon, and the amelioration of the structural stress provided by the presence of Ni2+ and Fe2+ in the olivine structure.

DOI10.1021/ic5028306
Short TitleInorg Chem
Alternate JournalInorganic chemistry