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首页> 外文期刊>Electrochimica Acta >Microstructural analysis of the ageing of pseudo-binary (Ti,Zr)Ni intermetallic compounds as negative electrodes of Ni-MH batteries
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Microstructural analysis of the ageing of pseudo-binary (Ti,Zr)Ni intermetallic compounds as negative electrodes of Ni-MH batteries

机译：Ni-MH电池负极的假二元（Ti，Zr）Ni金属间化合物的时效组织

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摘要

Ageing of Ti{sub}1.02-xZr{sub}xNi{sub}0.98 (0≤x≤0.48) compounds during the electrochemical cycling in aqueous KOH electrolyte has been investigated. Microstructural and chemical characterisation, mostly conducted by transmission electron microscopy, show that for all electrodes their activation results from calendar KOH corrosion. After activation, Zr substituted compounds attain much higher capacity (～350 mAh g{sup}(-1)) than the binary TiNi compound (～150 mAh g{sup}(-1)) but their cycle-life is poor. The mechanism of electrode degradation differs for the binary and the substituted compounds. For TiNi, degradation is due to KOH corrosion whereas, for substituted compounds, it mainly results from the loss of electrical contact due to particle pulverisation. For all electrodes, KOH corrosion produces a double surface layer formed by an inner two-phase (Ni-NiO) nanocrystalline layer and an outer (Ti,Zr)O{sub}2 amorphous layer.
机译：研究了在水性KOH电解质中电化学循环过程中Ti {sub} 1.02-xZr {sub} xNi {sub} 0.98（0≤x≤0.48）化合物的时效。主要通过透射电子显微镜进行的显微结构和化学表征表明，对于所有电极，它们的活化均来自日历KOH腐蚀。活化后，Zr取代的化合物比二元TiNi化合物（〜150 mAh g {sup}（-1））具有更高的容量（〜350 mAh g {sup}（-1）），但循环寿命很短。对于二元化合物和取代的化合物，电极降解的机理不同。对于TiNi，降解是由于KOH腐蚀引起的，而对于取代的化合物，其降解主要是由于颗粒粉碎导致的电接触损失。对于所有电极，KOH腐蚀会产生一个由内部两相（Ni-NiO）纳米晶体层和外部（Ti，Zr）O {sub} 2非晶层形成的双层表面。

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