New findings: structural changes in LiAlxMn2-xO4

Citation
Ys. Lee et al., New findings: structural changes in LiAlxMn2-xO4, ELECTROCH C, 3(1), 2001, pp. 20-23
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ELECTROCHEMISTRY COMMUNICATIONS
ISSN journal
1388-2481 → ACNP
Volume
3
Issue
1
Year of publication
2001
Pages
20 - 23
Database
ISI
SICI code
1388-2481(200101)3:1<20:NFSCIL>2.0.ZU;2-4
Abstract
LiAl0.1Mn1.9O4 was synthesized using LiOH, Al(NO3)(3) and two different Mn sources (gamma -MnOOH and Mn3O4). The X-ray diffraction (XRD) analyses of t he prepared materials revealed identical crystalline phases (cubic, Fd (3) over bar m). The two LiAl0.1Mn1.9O4 materials presented very good cycling p erformance in the 4 V region, but the LiAl0.1Mn1.9O4 prepared using Mn3O4 s howed a severe capacity fading in the 3 V region. It showed a mixed cubic a nd tetragonal phase which was detected from the XRD spectrum of the materia l discharged down to 2.2 V after 50 cycles. Meanwhile, it was observed that LiAl0.1Mn1.9O4 synthesized using gamma -MnOOH has only a tetragonal phase after the electrochemical test under the same conditions and had a higher c apacity retention rate in the 3 V region. We now report the extraordinary e lectrochemical performances from the two LiAl0.1Mn1.9O4 materials prepared using different manganese sources. (C) 2001 Elsevier Science B.V. All right s reserved.