SHERP

Degradation Mechanisms in Doped Spinels of LiM0.05Mn1.95O4 (M=Li, B, Al, Co, and Ni) for Li Secondary Batteries

Cited 0 time in webofscience Cited 147 time in scopus
Authors
Lee, Jong H.; Hong, Jin K.; Jang, Dong H.; Sun, Y. -K.; Oh, Seung M.
Issue Date
2000-06-06
Publisher
Elsevier
Citation
J. Power Sources 89 (2000) 7
Keywords
Lithium secondary batteriesLithium manganese oxidesCathode degradationElectrochemical voltage spectroscopySpinel dissolution
Abstract
Spinel lithium manganese oxides with a nominal composition of LiM0.05Mn1.95O4 (M=Mn, Li, Al, Co, Ni, or B) are prepared and their degradation mechanisms encountered in lithium secondary cells are investigated. Among the degradation mechanisms proposed in previous reports, those arising either from cation mixing or from the formation of oxygen-deficient spinels are negligible in these materials, but a certain amount of spinel dissolution is observed. X-ray diffraction (XRD) analysis indicates that the spinel lattice experiences an appreciable change in volume during charge–discharge cycling. The extent of this change depends on the nature of dopant. Compared to the undoped spinel, the lattice expansion/contraction according to Li+ insertion/removal is more significant in the B-doped spinel, but it is smaller in the case of Ni-, Co-, Al-, or Li-doped spinels. Spinels experiencing a smaller volume change maintain their structural integrity, even after prolonged cell cycling, such that there is a better capacity retention. In the B-doped spinel, however, the spinel lattice is largely collapsed and new phases are formed after cell cycling. This results in poor cycleability. It is proposed that the structural breakdown due to the repeated change in lattice volume is the most important failure mode in these materials. Spinel dissolution plays a second major role.
ISSN
0378-7753
Language
English
URI
http://hdl.handle.net/10371/5704
DOI
https://doi.org/10.1016/S0378-7753(00)00375-X

https://doi.org/10.1016/S0378-7753(00)00375-X
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse