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Impact of cobalt content in Na0.67MnxFeyCozO2 (x + y + z = 1), a cathode material for sodium ion batteries

机译:Na 0.67 Mn x Fe y Co 中钴含量的影响 z O 2 x + y + z = 1 ),钠离子电池的正极材料

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Due to the toxicity and price of cobalt (Co), Na0.67MnxFeyCozO2 (NaMFC) was tested as a cathode material for Na-ion batteries with lower cobalt contents. The objective was to set the Co to a maximum of 0.15 and compensate its loss by changing the ratio of Mn or Fe. The synthesized compounds were compared to two reference materials Na0.67Mn0.5Fe0.25Co0.25O2 and Na0.67Mn0.5Fe0.5O2. Microscopy (SEM), X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS) and electrochemical tests were performed to characterize the pristine samples and to understand the impact of the cobalt on the electrochemical mechanism. A link was established between the amount of Co in the NaMFC material and the oxidation state of the Mn in the discharged sample. We confirmed that the role of the cobalt is to prevent a high Mn(III) ratio in the compound and thus help to limit the fading of the electrochemical performance. The compound Na0.67Mn0.5Fe0.35Co0.15O2 offers a good compromise between electrochemical stability and lower Co content.
机译:由于钴(Co)的毒性和价格,Na 0.67 Mn x Fe y Co z O 2 (NaMFC)被测试为钴含量较低的Na离子电池的正极材料。目的是将Co设置为最大值0.15,并通过更改Mn或Fe的比例来补偿其损失。将合成的化合物与两种参考物质Na 0.67 Mn 0.5 Fe 0.25 < / sub> Co 0.25 O 2 和Na 0.67 Mn 0.5 Fe 0.5 O 2 。进行了显微镜(SEM),X射线衍射(XRD),X射线吸收光谱(XAS)和电化学测试,以表征原始样品并了解钴对电化学机理的影响。在NaMFC材料中的Co含量与放电样品中Mn的氧化态之间建立了联系。我们证实钴的作用是防止化合物中高的Mn( III )比,从而有助于限制电化学性能的降低。化合物Na 0.67 Mn 0.5 Fe 0.35 Co 0.15 O 2 在电化学稳定性和较低的Co含量之间取得了很好的折衷。

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