dc.contributor.author |
Thackeray, MM
|
|
dc.contributor.author |
Rossouw, MH
|
|
dc.contributor.author |
Gummow, RJ
|
|
dc.contributor.author |
Liles, DC
|
|
dc.contributor.author |
Pearce, K
|
|
dc.contributor.author |
De Kock, A
|
|
dc.contributor.author |
David, WIF
|
|
dc.contributor.author |
Hull, s
|
|
dc.date.accessioned |
2007-06-08T06:38:53Z |
|
dc.date.available |
2007-06-08T06:38:53Z |
|
dc.date.issued |
1993-06 |
|
dc.identifier.citation |
Thackeray, MM, et al. 1993. Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation. Electrochimica Acta, vol 38(9), pp 1259-1267 |
en |
dc.identifier.issn |
0013-4686 |
|
dc.identifier.uri |
http://hdl.handle.net/10204/451
|
|
dc.description |
Copyright: 1993 Pergamon Press Ltd |
en |
dc.description.abstract |
A pure and highly crystalline form of ramsdellite-MnO2 has been synthesized by acid treatment of the spinels LiMn2O4 and Li2Mn4O9 at 95°C. Although the ramsdellite-MnO2 framework remains intact on lithiation at 70°C, the hexagonally-close-packed oxygen array buckles towards a cubic-close-packed structure to accommodate the inserted lithium ions. The reaction is reversible but the instability of the structure on cycling limits the utility of ramsdellite-MnO2 as a rechargeable electrode in lithium cells. The ramsdellite structure can be stabilized by reaction with LiOH or LiNO3 at 300-400°C; this reaction, which displaces manganese ions from the MnO2 framework into interstitial octahedral sites generates spinel-related domains that coexist with the lithiated ramsdellite phase. At 300°C, under vacuum, the lithiated ramsdellite phase Li0.5MnO2 transforms to the spinel LiMn2O4; at 300-400°C, in air, it oxidizes slowly and transforms to a defect spinel LiMn2O4+delta (0 < delta < = 0.5) via an intermediate compound. A mechanism for the ramsdellite-spinel transition is proposed. |
en |
dc.language.iso |
en |
en |
dc.publisher |
Pergamon Press Ltd |
en |
dc.subject |
Ramsdellite-MnO2 |
en |
dc.subject |
Manganese dioxide |
en |
dc.subject |
Lithium batteries |
en |
dc.subject |
Electrochemistry |
en |
dc.subject |
Sciences |
en |
dc.title |
Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation |
en |
dc.type |
Article |
en |
dc.identifier.apacitation |
Thackeray, M., Rossouw, M., Gummow, R., Liles, D., Pearce, K., De Kock, A., ... Hull, s. (1993). Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation. http://hdl.handle.net/10204/451 |
en_ZA |
dc.identifier.chicagocitation |
Thackeray, MM, MH Rossouw, RJ Gummow, DC Liles, K Pearce, A De Kock, WIF David, and s Hull "Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation." (1993) http://hdl.handle.net/10204/451 |
en_ZA |
dc.identifier.vancouvercitation |
Thackeray M, Rossouw M, Gummow R, Liles D, Pearce K, De Kock A, et al. Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation. 1993; http://hdl.handle.net/10204/451. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Thackeray, MM
AU - Rossouw, MH
AU - Gummow, RJ
AU - Liles, DC
AU - Pearce, K
AU - De Kock, A
AU - David, WIF
AU - Hull, s
AB - A pure and highly crystalline form of ramsdellite-MnO2 has been synthesized by acid treatment of the spinels LiMn2O4 and Li2Mn4O9 at 95°C. Although the ramsdellite-MnO2 framework remains intact on lithiation at 70°C, the hexagonally-close-packed oxygen array buckles towards a cubic-close-packed structure to accommodate the inserted lithium ions. The reaction is reversible but the instability of the structure on cycling limits the utility of ramsdellite-MnO2 as a rechargeable electrode in lithium cells. The ramsdellite structure can be stabilized by reaction with LiOH or LiNO3 at 300-400°C; this reaction, which displaces manganese ions from the MnO2 framework into interstitial octahedral sites generates spinel-related domains that coexist with the lithiated ramsdellite phase. At 300°C, under vacuum, the lithiated ramsdellite phase Li0.5MnO2 transforms to the spinel LiMn2O4; at 300-400°C, in air, it oxidizes slowly and transforms to a defect spinel LiMn2O4+delta (0 < delta < = 0.5) via an intermediate compound. A mechanism for the ramsdellite-spinel transition is proposed.
DA - 1993-06
DB - ResearchSpace
DP - CSIR
KW - Ramsdellite-MnO2
KW - Manganese dioxide
KW - Lithium batteries
KW - Electrochemistry
KW - Sciences
LK - https://researchspace.csir.co.za
PY - 1993
SM - 0013-4686
T1 - Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation
TI - Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation
UR - http://hdl.handle.net/10204/451
ER -
|
en_ZA |