Phase Distribution and Electrochemical Properties of Al-Substituted Nickel Hydroxides
Phase Distribution and Electrochemical Properties of Al-Substituted Nickel Hydroxides
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DOI：
10.1021/jp0655468
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发表时间：
2007-03
影响因子：
3.7
通讯作者：
L. Yang;Xue Gao;Q. Wu;Huaiyong Zhu;G. Pan
中科院分区：
文献类型：
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作者：
L. Yang;Xue Gao;Q. Wu;Huaiyong Zhu;G. Pan
用化学共沉淀法和随后的水热法将氢氧镍中的少量铝取代镍，可以得到稳定的正极材料。通过x射线衍射（XRD）、扫描电子显微镜（SEM）和透射电子显微镜（TEM）对结构演变进行了详细的研究。采用充放电实验和循环伏安（CV）法研究了铝取代氢氧镍在碱性溶液中的电化学性能。水热处理提高了铝取代氢氧镍的结晶度，其电极性能明显优于未经处理的样品。经水热处理后，Al取代量为10% （mol）的α-和β-相混合结构样品的最大放电容量为333 mAh/g，相当于α-相氢氧镍中每个Ni原子交换了1.46个电子。混合料中的相分布对性能有很大影响。
Substituting small contents of aluminum for nickel in nickel hydroxides by a chemical coprecipitation and a subsequent hydrothermal process can yield stable positive electrode materials. Detailed studies on the structural evolution were conducted by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical properties of Al-substituted nickel hydroxides in alkaline solution were examined by charge−discharge experiments and cyclic voltammetric (CV) measurements. Hydrothermal treatments improved the crystallinity of Al-substituted nickel hydroxides, which exhibited much better electrode performance than the untreated samples. The sample with 10% (in mol) Al substitution having a mixture structure with α- and β-phases after hydrothermal treatments showed the maximum discharge capacity of 333 mAh/g, corresponding to 1.46 exchanged electrons per Ni atom in α-phase nickel hydroxides. The phase distribution in the mixture has a great influence on ...