CAJ | 학술논문

以Ni(NO3)2·6H2O、Al(NO3)3·9H2O、尿素和MCNTs为原料，采用原位均相沉淀法制备了MCNTs含量（质量分数）分别为1%、3%和5%的Ni/Al-LDH/MCNTs复合电极活性材料。采用X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）和场发射扫描电子显微镜（FESEM）表征了材料的微观结构和形貌；采用循环伏安（CV）、电化学交流阻抗（EIS）和充放电测试研究了该复合材料作为镍氢电池正极材料的电化学性能。结果表明，在Ni/Al-LDH 中复合 MCNTs 能够提高材料的电化学活性，降低电化学反应电阻，显著改善材料的大电流充放电性能。其中MCNTs含量为3%的Ni/Al-LDH/MCNTs复合材料具有最佳的电化学性能，在200、500、1000和2000 mA·g-1电流密度下的放电比容量分别为330、321、307和288 mA·h·g-1，而未复合MCNTs的Ni/Al-LDH在2000 mA·g-1电流密度下放电比容量仅为205 mA·h·g-1。
이Ni(NO3)2·6H2O、Al(NO3)3·9H2O、뇨소화MCNTs위원료，채용원위균상침정법제비료MCNTs함량（질량분수）분별위1%、3%화5%적Ni/Al-LDH/MCNTs복합전겁활성재료。채용X사선연사（XRD）、부리협변환홍외광보（FTIR）화장발사소묘전자현미경（FESEM）표정료재료적미관결구화형모；채용순배복안（CV）、전화학교류조항（EIS）화충방전측시연구료해복합재료작위얼경전지정겁재료적전화학성능。결과표명，재Ni/Al-LDH 중복합 MCNTs 능구제고재료적전화학활성，강저전화학반응전조，현저개선재료적대전류충방전성능。기중MCNTs함량위3%적Ni/Al-LDH/MCNTs복합재료구유최가적전화학성능，재200、500、1000화2000 mA·g-1전류밀도하적방전비용량분별위330、321、307화288 mA·h·g-1，이미복합MCNTs적Ni/Al-LDH재2000 mA·g-1전류밀도하방전비용량부위205 mA·h·g-1。
Ni/Al-LDH/MCNTs composites with MCNTs contents of 1%, 3%, and 5%were prepared by the in-situ homogeneous precipitation method with Ni(NO3)3·6H2O, Al(NO3)3·9H2O, urea, and MCNTs as raw materials. The microstructure and morphology of the Ni/Al-LDH/MCNTs composites were analyzed with X-ray diffraction (XRD), Fourier transform infrared (FTIR) and field emission scanning electron microscopy (FESEM). The electrochemical performance of the Ni/Al-LDH/MCNTs composites used as cathode materials for nickel-hydrogen battery were characterized with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and charge-discharge tests. The results demonstrated that the introduction of MCNTs could enhance electrochemical activity, decrease electrochemical reaction resistance, and significantly improve high rate performance of Ni/Al-LDH. In particular, the Ni/Al-LDH/MCNTs composite with MCNTs content of 3% had the best electrochemical performance. For example, the specific discharge capacities of the Ni/Al-LDH/MCNTs composite with MCNTs content of 3%under current densities of 200, 500, 1000, and 2000 mA·g-1 were 330, 321, 307, and 288 mA·h·g-1, respectively. While for the Ni/Al-LDH without MCNTs, the specific discharge capacity was only 205 mA·h·g-1 under the current density of 2000 mA·g-1.