Effects of coprecipitated zinc on the structure and electrochemical performance of Ni/Al-layered double hydroxide
Effects of coprecipitated zinc on the structure and electrochemical performance of Ni/Al-layered double hydroxide
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DOI：
10.1016/s0360-3199(01)00175-6
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发表时间：
2002-05
影响因子：
7.2
通讯作者：
H. Chen;J. M. Wang;T. Pan;H. Xiao;Jiqiang Zhang;C. Cao
中科院分区：
文献类型：
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作者：
H. Chen;J. M. Wang;T. Pan;H. Xiao;Jiqiang Zhang;C. Cao
研究了锌对共沉淀法制备的Ni/ al层状双氢氧化物（LDHs）结构和电化学性能的影响。实验结果表明，在Ni/Al-LDHs中添加锌提高了样品的放电电位、循环稳定性和可逆性等电化学性能。未加锌的Ni/Al-LDHs的最大比放电容量为425 mAh g−1。含锌6.4 wt %的样品在1C倍率下充放电398次后，最大放电中间电位为413 mV，容量劣化率<5%。电化学阻抗谱和粉末x射线衍射测试结果表明，高锌含量的Ni/Al-LDHs具有优异的性能，这是由于其在c轴方向上的电子转移电阻（Rt）和每晶胞数降低，锌在碱性溶液中的溶解速度减慢。
The effects of zinc on the structure and electrochemical performance of Ni/Al-layered double hydroxides (LDHs) prepared by a coprecipitation method were studied. The experimental results showed that the addition of zinc in Ni/Al-LDHs improved the electrochemical performance of the samples such as discharge potential, cycle stability and reversibility. The maximum specific discharge capacity of 425 mAh g−1of nickel hydroxide was obtained for the Ni/Al-LDHs without zinc. The maximum discharge mediate potential of 413 mV and the lowest capacity deterioration rate of <5% after 398 charge–discharge cycles at 1C rate were gained for the 6.4 wt % Zn-containing sample. The results of electrochemical impedance spectroscopy and powder X-ray diffraction measurements indicated that the advantageous performance of Ni/Al-LDHs with high zinc content resulted from the decrease of electron transfer resistance (Rt) and the number of cells per crystallite in the direction of c-axis and slow dissolution of zinc in alkaline solution.