Effect of preparation conditions on properties of Al-substituted α-Ni(OH)_2 prepared by homogeneous

• 作 者: 张倩 徐艳辉 王晓琳 何国荣
• 机 构: Department of Chemical Engineering, Tsinghua University, Beijing 100084, China,Department of Chemica
• 出 处: Transactions of Nonferrous Metals Society of China
• 发表日期: 2005年03期
• 关键词: substituted acetylene battery contrary slightly FWHM respective have

Al-substituted α-Ni(OH)_2 was synthesized under different reaction conditions by a homogeneous precipitation method. The effect of reaction temperature, reaction time, Ni and Al ions concentration and reagent ratio on the physico-chemical properties and electrochemical performance of Al-substituted α-Ni(OH)_2 was studied. The Al-substituted α-Ni(OH)_2 samples were characterized by X-ray diffractometry(XRD), infrared spectrometry(FT-IR), inductively coupled plasma(ICP), thermogravimetry(TG) and electrochemical test. The results reveal that the physico-chemical properties and electrochemical performance of the sample are influenced strongly by the preparation conditions. Keeping reaction temperature at 100 or 104℃ is appropriate and the largest specific discharge capacity of the sample is 320mA·h/g. With the reaction time increasing, the discharge capacity increases first and then decreases slightly. It is appropriate that the Ni and Al ions concentration and the ratio of urea to Ni and Al ions are ~0.42mol/L and ~0.75∶1, respectively.

Al-substituted α-Ni (OH) _2 was synthesized under different reaction conditions by a homogeneous precipitation method. The effect of reaction temperature, reaction time, Ni and Al ions concentration and reagent ratio on the physico-chemical properties and electrochemical performance of Al The Al-substituted α-Ni (OH) _2 samples were characterized by X-ray diffractometry (XRD), infrared spectrometry (FT-IR), inductively coupled plasma thermogravimetry (TG) and electrochemical test. The results reveal that the physico-chemical properties and electrochemical performance of the sample are regulated strongly by the preparation conditions. Keeping reaction temperature at 100 or 104 ° C is appropriate and the largest specific discharge capacity of the With is the reaction time increasing, the discharge capacity increases first and then decreases slightly. It is the appropriate that the Ni and Al ions concentration and the ratio of ure a to Ni and Al ions are ~ 0.42 mol / L and ~ 0.75: 1 respectively.