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Comparative study on microstructure of β-Ni(OH)_2 as cathode material for Ni-MH battery

机译:Ni-MH电池正极材料β-Ni(OH)_2的微观结构比较研究

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Microstructures such as micro-strain, crystallite as well as stacking faults can result in broadening of X-ray diffraction lines. Based on least square principle, new computation method and programs, which can separate the two-fold broadening effect caused by crystallite/stacking faults and which can separate the three-fold broadening effect caused by crystallite/residual stress/stacking faults, have been proposed. As a result, micro-strain and crystallite sizes as well as stacking fault probability can be calculated respectively and investigated in detail. Then the microstructures of β-Ni(OH)_2 are investigated by means of these methods. The main results are as follows: 1) The shape and size of crystallite as well as stacking fault probability of raw β-Ni(OH)_2 are dependent on its preparation technique. 2) Activation changes the microstructure of β-Ni(OH)_2. It transforms the crystallite shape from short-fat cylinder into polyhedrons or nearly equiaxial grains. Activation also alters the residual strain states and stacking fault probability. 3) After charge-discharge and cycle-lifetime testing, the crystallites of β-Ni(OH)_2 are fined further and its residual strain and fault probability were alternated. The extent of these effects are dependent on circulating conditions. 4) Calcium additive in β-Ni(OH)_2 restrains grain fining process and turns twin fault into deformation fault. 5) Comprehensive analysis reveals that micro structural parameters of β-Ni(OH)_2 are correlated with some performance of Ni-MH battery.
机译:诸如微应变,微晶以及堆垛层错之类的微观结构会导致X射线衍射线变宽。根据最小二乘原理,提出了一种新的计算方法和程序,可以分离出由微晶/堆垛层错引起的两倍展宽效应,可以分离出由微晶/残余应力/堆垛层错引起的三倍展宽效应。 。结果,可以分别计算和详细研究微应变和微晶尺寸以及堆垛层错概率。然后通过这些方法研究了β-Ni(OH)_2的微观结构。主要研究结果如下:1)原始β-Ni(OH)_2的微晶形状和尺寸以及堆积缺陷的几率取决于其制备工艺。 2)活化改变了β-Ni(OH)_2的微观结构。它将微晶形状从短脂肪圆柱体转变为多面体或几乎等轴的晶粒。激活还会改变残余应变状态和堆垛层错概率。 3)经过充放电和循环寿命测试,进一步细化了β-Ni(OH)_2的微晶,并使其残余应变和故障概率交替出现。这些影响的程度取决于循环条件。 4)β-Ni(OH)_2中的钙添加剂抑制了晶粒细化过程,使孪生断层转变为变形断层。 5)综合分析表明,β-Ni(OH)_2的微观结构参数与镍氢电池的某些性能有关。

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