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Browsing by Author "Gummow, RJ"

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Characterization of LT-LiXO1-YNIYO2 electrodes for rechargeable lithium cells

Author: Gummow, RJ ; Thackeray, MM Date: Dec 1993 LT-LiC0.9Ni0.1O2 prepared at 400 degrees C with a structure that is intermediate between an ideal lithiated spinel and a layered structure has been investigated as an electrode in rechargeable Lithium cells; it delivers a voltage vs. pure ... Read more
Effect of mulitivalent cation dopants on lithium manganese spinel cathodes

Author: De Kock, A ; Freg, E ; Gummow, RJ Date: Feb 1998 The aim of this investigation is to determine optimised spinel cathode compositions that can be used in lithium cells. The cycling stability of 4 V LixMn2O4 electrodes in lithium, flooded electrolyte glass cells has been improved by the ... Read more
Improved capacity retention in rechargeable 4 V lithium/lithium manganese oxide (spinel) cells.

Author: Gummow, RJ ; De Kock, A ; Thackeray, MM Date: Apr 1994 The rechargeable capacity of 4 V LixMn2O4 spinel cathodes (0 < x <= 1) has been improved by modifying the composition of the spinel electrode. Stable rechargeable capacities in excess of 100 mAh/g in flooded-electrolyte lithium cells can be ... Read more
Investigation of spinel-related and orthorhombic LiMNO2 cathodes for rechargeable lithium batteries

Author: Gummow, RJ ; Thackeray, MM Date: May 1994 Cathode materials that have been synthesized by reduction of lithium-manganese- Cathode materials that have been synthesized by reduction of lithium-manganese-oxide and manganese-oxide precursors with hydrogen at 300 to 350-degrees-C, and ... Read more
Lithium extraction from orthorhombic lithium manganese oxide and the phase-transformation to spinel

Author: Gummow, RJ ; Liles, DC ; Thackeray, MM Date: Dec 1993 Orthorhombic LiMnO2 products, synthesised by the reaction of gamma-MnO2 and LiOH in argon at 600-620 degrees C using carbon as a reducing agent, have been evaluated as electrode materials in lithium cells. Products that contained a minor ... Read more
Ramsdellite-MnO2 for lithium batteries: The ramsdellite to spinel transformation

Author: Thackeray, MM ; Rossouw, MH ; Gummow, RJ ; Liles, DC ; Pearce, K ; De Kock, A ; David, WIF ; Hull, s Date: Jun 1993 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 ... Read more
Reinvestigation of the structures of lithium-cobalt-oxides with neutron-diffraction data

Author: Gummow, RJ ; Liles, DC ; Thackeray, MM ; David, WIF Date: Nov 1993 The structures of LT-LiCoO2 (synthesised by reaction of Li2CO3 and CoCO3 at 400-degrees-C) and its delithiated product LT-Li0.4CoO2 have been reinvestigated by neutron powder diffraction. Despite an unusually close similarity between diffraction ... Read more
Spinal Anodes for Lithium-Ion Batteries

Author: Ferg, E ; Gummow, RJ ; De Kock, A ; Thackeray, MM Date: Nov 1994 Anodes of Li4Mn5O12, Li4Ti5O12, and Li2Mn4O9 with a spinel-type structure have been evaluated in room-temperature lithium cells. The cathodes that were selected for this study were the stabilized spinels, Li1.03Mn1.97O4 and LiZn0.025Mn1.95O4, ... Read more
Spinel versus layered structures for lithium cobalt oxide synthesized at 400-degrees-c

Author: Gummow, RJ ; Liles, DC ; Thackeray, MM Date: Mar 1993 Rietveld refinements of X-ray data of LiCoO2 prepared at 400-degrees-C and a chemically-delithiated product Li0.5CoO2 using space group symmetries R3mBAR and Fd3m are reported. Refinements in both R3mBAR (layered-type structure) and Fd3m ... Read more
Versatility of MnO2 for lithium battery applications

Author: Thackeray, MM ; Rossouw, MH ; De Kock, A ; De la Harpe, AP ; Gummow, RJ ; Pearce, K ; Liles, DC Date: 15 Mar 1993 Manganese dioxide has for many years found widespread use as a cathode material in aqueous Leclanche, zinc chloride and alkaline cells and, more recently, in nonaqueous lithium cells. However, despite the large number of polymorphic structures ... Read more

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Browsing by Author "Gummow, RJ"

Browsing by Author "Gummow, RJ"

Browse

All of ResearchSpace

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