CAJ | 학술논문

采用尿素分解法制备了Al代α-Ni(OH)2粉体材料，主要考察了合成过程中液相阴离子(SO42-和NO3-)对Al代α-Ni(OH)2微观结构和电化学性能的影响。XRD分析表明液相中的NO3-有利于提高Al代α-Ni(OH)2的结晶度，并且合成的Al代α-Ni(OH)2具有较大的层间距。FT-IR和TGA测试表明液相阴离子在合成过程中会嵌入Al代α-Ni(OH)2的层间，进而影响其晶体结构、含水量和热稳定性。SEM 图像表明尿素分解法制备的Al 代α-Ni(OH)2是具有明显次级结构的球形颗粒，并且颗粒的次级结构形状与液相阴离子密切相关。采用CV、EIS和充放电测试表征了合成样品的电化学性能，发现液相含有NO3-条件下合成的Al代α-Ni(OH)2具有相对较好的电化学反应可逆性和高的放电比容量。
채용뇨소분해법제비료Al대α-Ni(OH)2분체재료，주요고찰료합성과정중액상음리자(SO42-화NO3-)대Al대α-Ni(OH)2미관결구화전화학성능적영향。XRD분석표명액상중적NO3-유리우제고Al대α-Ni(OH)2적결정도，병차합성적Al대α-Ni(OH)2구유교대적층간거。FT-IR화TGA측시표명액상음리자재합성과정중회감입Al대α-Ni(OH)2적층간，진이영향기정체결구、함수량화열은정성。SEM 도상표명뇨소분해법제비적Al 대α-Ni(OH)2시구유명현차급결구적구형과립，병차과립적차급결구형상여액상음리자밀절상관。채용CV、EIS화충방전측시표정료합성양품적전화학성능，발현액상함유NO3-조건하합성적Al대α-Ni(OH)2구유상대교호적전화학반응가역성화고적방전비용량。
Al-substituted α-Ni(OH)2 powders were prepared by a homogeneous precipitation method with urea. The effects of anions (SO42-and NO3-) in the reaction solution on the microstructure and electrochemical performance of Al-substitutedα-Ni(OH)2 powders were studied. XRD results reveal that the presence of NO3-in reaction solution facilitates the crystallization of Al-substituted α-Ni(OH)2 and induces a relatively larger interlayer space. FT-IR and TGA results indicate that these anions can embed in the interlayer of Al-substitutedα-Ni(OH)2, which consequently affects its crystal structure, water content and thermal stability. SEM images show that the Al-substituted α-Ni(OH)2 synthesized by the homogeneous precipitation method has a hierarchical spherical structure which is closely related to these anions. The electrochemical performance of the Al-substitutedα-Ni(OH)2 powders were characterized by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS), and charge/discharge tests. The results demonstrate that the Al-substituted α-Ni(OH)2 prepared with the presence of NO3-shows better reaction reversibility and larger specific discharge capacity.