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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
chemical engineering
Nickel dioxide polymorphs as lithium insertion electrodes
Electrochimica Acta, Volume 47, No. 17, Year 2002
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Description
Five kinds of nickel dioxide polymorphs, LixNiO2 with x ≈ 0, were prepared by treating LiNiO2 with sulfuric acid solutions, occasionally followed by low-temperature heating. Here we report their structure and properties as lithium insertion electrodes. Acid-treated Li0.10NiO2 with two layered phases turned into a single-layered compound at 160 °C and then to a spinel-related compound at 170 °C. Acid-treated Li0.04NiO2 contained a phase with a cadmium iodide structure, which was not observed with Li0.10NiO2. Heating this Li0.04NiO2 yielded a spinel-related compound on heating. The Ni-O distances in these compounds suggested that the nickel oxidation state was kept approximately +4. These 'nickel dioxide' polymorphs exhibited varied characteristics as lithium insertion electrodes. We discuss the electrode behavior together with the structural changes that occur during lithium insertion. We also examined the effect of the electrode drying condition on the cycling performance. © 2002 Elsevier Science Ltd. All rights reserved.
Authors & Co-Authors
Arai, Hajime
Japan, Tokyo
Nippon Telegraph and Telephone Corporation
Tsuda, Masayuki
South Africa
Ntt Corporation
Saito, Keiichi
South Africa
Ntt Corporation
Hayashi, Masahiko
South Africa
Ntt Corporation
Sakurai, Yoji
South Africa
Ntt Corporation
Statistics
Citations: 6
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.1016/S0013-4686(02)00134-2
ISSN:
00134686