The Syntheses and Characterization of Layered LiNi1-y-zMnyCozO2 Compounds

Autor:	Natasha A. Chernova, M. Stanley Whittingham, Luis J. Matienzo, J. Katana Ngala, Peter Y. Zavalij
Rok vydání:	2002
Předmět:	Crystallography Materials science X-ray photoelectron spectroscopy Oxidation state Rietveld refinement Magnetic susceptibility Powder diffraction Transition metal ions Characterization (materials science) Layered structure
Zdroj:	MRS Proceedings. 756
ISSN:	1946-4274 0272-9172
DOI:	10.1557/proc-756-ee6.4
Popis:	The layered compounds of formula LiNi0.4Mn0.6-yCoyO2, for y=0.2, 0.3, and 0.4 and LiNi0.7-yMn0.3CoyO2 for y=0.3, and 0.1 were synthesized at 800°C. X-ray powder diffraction indicates layered structure of R 3m symmetry similar to a-NaFeO2. Rietveld refinement data shows that Mn and Ni increase the tendency of transition metal ions to migrate into the interlayer sites relative to LiCoO2. Both magnetic susceptibility and XPS data support a 2+ oxidation state for Ni and 4+ and 3+ for Mn and Co, respectively. The layered compound LiNi0.4Mn0.4Co0.2O2 shows a high initial capacity of about 200mAh/g when cycled between 2.5V and 4.3 V at 20°C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1df100fc9b7ffe9f12e8cd94dcd176b9 https://doi.org/10.1557/proc-756-ee6.4 Zobrazit plný text záznamu Full text from SpringerLink