Electrical and electrochemical properties of Li2M(WO4)2 (M = Ni, Co and Cu) compounds

Karim Karoui; Abdelfattah Mahmoud; Abdallah Ben Rhaiem; Frèdéric Boschini

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Electrical and electrochemical properties of Li2M(WO4)2 (M = Ni, Co and Cu) compounds

机译：Li2M（WO4）2（M = Ni，Co和Cu）化合物的电气和电化学性质

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Li _(2) M(WO _(4) ) _(2) (M = Co, Cu or Ni) materials have been synthesized using the solid-state reaction method. X-ray diffraction measurements confirmed the single phase of the synthesized compounds in the triclinic crystal system (space group P ). The SEM analyses revealed nearly spherical morphology with the particle size in the range of 1–10 μm. The IR spectra confirm the presence of all modes of WO _(4) ~(2?) . The impedance spectroscopy measurements showed the presence of grain boundaries and allow determination of the conductivity of the synthesized materials at room temperature. As positive electrode materials for lithium ion batteries, Li _(2) M(WO _(4) ) _(2) (M = Co, Cu or Ni) cathode materials deliver initial discharge capacities of 31, 33 and 30 mA h g ~(?1) for cobalt, nickel, and copper, respectively.

机译：Li _（2）M（WO _（4））_（2）（M = CO，Cu或Ni）材料使用固态反应方法合成。 X射线衍射测量证实了三级晶体系统（空间组P）中合成化合物的单相。 SEM分析显示了几乎球形的形态，粒径为1-10μm。 IR光谱确认存在WO _（4）〜（2？）的所有模式。阻抗光谱测量显示存在晶界的存在并允许在室温下测定合成材料的导电性。作为锂离子电池的正极材料，Li _（2）M（WO _（4））_（2）（M = CO，Cu或Ni）阴极材料提供初始放电容量为31,33和30 ma Hg〜（？1）分别用于钴，镍和铜。

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《RSC Advances》 |2019年第12期|共8页
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Karim Karoui; Abdelfattah Mahmoud; Abdallah Ben Rhaiem; Frèdéric Boschini;
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Electrical and electrochemical properties of Li2M(WO4)2 (M = Ni, Co and Cu) compounds

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