Structural and Thermal Characteristics of Nickel Dioxide Derived from LiNiO2
Structural and Thermal Characteristics of Nickel Dioxide Derived from LiNiO2
复制标题
LiNiO2 衍生的二氧化镍的结构和热特性
DOI：
--
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. Sakurai
中科院分区：
文献类型：
--
作者：
H. Arai;Masayuki Tsuda;Keiichi Saito;M. Hayashi;K. Takei;Y. Sakurai
摘要：我们报告了高度脱锂（锂提取）化合物 Li x NiO 2 的结构和热特性，该化合物可称为“二氧化镍”。我们通过硫酸处理LiNiO 2 得到Li 0.10 NiO 2 和Li 0.04 NiO 2 。两种产物均含有与氯化镉（O3型）类似的NiO 2 堆积相，但后者还含有与碘化镉（O1型）类似的NiO 2 堆积相。我们利用高温X射线衍射分析和热重分析检查了它们的热行为，发现通过在适当的温度下加热它们可以获得化学成分相似但结构不同的新型多晶型物。我们将这些结果与通过电化学脱锂获得的Li x NiO 2 的结果一起讨论。我们还报道了由Li 0.93 Ni 1.07 O 2 衍生的酸处理产品。
Abstract We report the structural and thermal characteristics of highly delithiated (lithium extracted) compounds Li x NiO 2 , which can be called “nickel 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 (O3-type), 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 diffraction analysis together with thermogravimetric analysis and found that novel polymorphs, with similar chemical compositions but different 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 .