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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
biochemistry, genetics and molecular biology
Demonstrating oxygen loss and associated structural reorganization in the lithium battery cathode Li[Ni0.2Li0.2Mn 0.6]O2
Journal of the American Chemical Society, Volume 128, No. 26, Year 2006
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Description
The cathode in rechargeable lithium-ion batteries operates by conventional intercalation; Li+ is extracted from LiCoO2 on charging accompanied by oxidation of Co3+ to Co4+; the process is reversed on discharge. In contrast, Li+ may be extracted from Mn 4+-based solids, e.g., Li2MnO3, without oxidation of Mn4+. A mechanism involving simultaneous Li and O removal is often proposed. Here, we demonstrate directly, by in situ differential electrochemical mass spectrometry (DBMS), that O2 is evolved from such Mn4+-containing compounds, Li[Ni 0.2Li0.2Mn0.6]O2, on charging and using powder neutron diffraction show that O loss from the surface is accompanied by diffusion of transition metal ions from surface to bulk where they occupy vacancies created by Li removal. The composition of the compound moves toward MO2. Understanding such unconventional Li extraction is important because Li-Mn-Ni-O compounds, irrespective of whether they contain Co, can, after O loss, store 200 mAhg-1 of charge compared with 140 mAhg-1 for LiCoO2. © 2006 American Chemical Society.
Authors & Co-Authors
Holzapfel, Michael
Switzerland, Villigen
Paul Scherrer Institut
Johnson, Christopher S.
United States, Lemont
Argonne National Laboratory
Thackeray, Michaelm M.
United States, Lemont
Argonne National Laboratory
Bruce, Peter G.
United Kingdom, St Andrews
Eastchem st Andrews
Statistics
Citations: 1,489
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1021/ja062027+
ISSN:
00027863