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首页> 外文期刊>Journal of Applied Electrochemistry >Study of a Li-Ni oxide mixture as a novel cathode for molten carbonate fuel cells by electrochemical impedance spectroscopy
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Study of a Li-Ni oxide mixture as a novel cathode for molten carbonate fuel cells by electrochemical impedance spectroscopy

机译：电化学阻抗谱法研究锂镍氧化物混合物作为熔融碳酸盐燃料电池新型阴极的研究

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Li-Ni oxide mixtures with high lithium content are considered to be an alternative cathode material for molten carbonate fuel cells (MCFCs). The electrochemical behaviour of Li0.4Ni0.6O samples has been investigated in a Li-K carbonate melt at 650 degreesC by electrochemical impedance spectroscopy as a function of immersion time and O-2 and CO2 partial pressure. The impedance spectra have been interpreted using a transmission line model that includes contact impedance between reactive particles. The Li0.4Ni0.6O powder particles show structural changes due to high lithium leakage and low nickel dissolution from the reactive surface to the electrolyte during the first 100 h of immersion. After this time, the structure seems to be stable. The partial pressures of O-2 and CO2 affect the processes of oxygen reduction and Li-Ni oxide oxidation. X-ray diffraction and chemical analysis performed on samples before and after the electrochemical tests have confirmed that the lithium content decreases. SEM observations reveal a reduction in grain size after the electrochemical tests. [References: 18]
机译：高锂含量的Li-Ni氧化物混合物被认为是熔融碳酸盐燃料电池（MCFC）的替代阴极材料。通过电化学阻抗谱研究了Li0.4Ni0.6O样品在650°C的Li-K碳酸盐熔体中的电化学行为，它是浸渍时间以及O-2和CO2分压的函数。已经使用包括反应性粒子之间的接触阻抗的传输线模型来解释了阻抗谱。 Li0.4Ni0.6O粉末颗粒在浸入的前100小时内由于锂的高泄漏和镍从反应性表面到电解质的低溶解而显示出结构变化。在这段时间之后，结构似乎是稳定的。 O-2和CO2的分压会影响氧还原和Li-Ni氧化物的氧化过程。在电化学测试之前和之后对样品进行的X射线衍射和化学分析已证实锂含量降低。 SEM观察表明，电化学测试后晶粒尺寸减小。 [参考：18]

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