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Structural and Thermal Characteristics of Nickel Dioxide Derived from LiNiO2

✍ Scribed by Hajime Arai; Masayuki Tsuda; Keiichi Saito; Masahiko Hayashi; Koji Takei; Yoji Sakurai

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
916 KB
Volume
163
Category
Article
ISSN
0022-4596

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✦ Synopsis

We report the structural and thermal characteristics of highly delithiated (lithium extracted) compounds Li x NiO 2 , which can be called 99nickel dioxide.:: We obtained Li 0.10 NiO 2 and Li 0.04 NiO 2 by treating LiNiO 2 with sulfuric acid. Both products contained phases with NiO 2 stacking similar to cadmium chloride (O3type), but the latter also included a phase with NiO 2 stacking similar to cadmium iodide (O1-type). We examined their thermal behavior using high temperature X-ray di4raction analysis together with thermogravimetric analysis and found that novel polymorphs, with similar chemical compositions but di4erent structures, were obtained by heating them at appropriate temperatures. We discuss these results together with those for Li x NiO 2 obtained by electrochemical delithiation. We also report acid-treated products derived from Li 0.93 Ni 1.07 O 2 .

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