Enhanced electrochemical performance by facilitating Li-ion diffusion in LiNi0.1MgxCo0.9−xO2 (0≤ x ≤ 0.2) — for high energy Li-ion batteries,Nano-Structures & Nano-Objects

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Enhanced electrochemical performance by facilitating Li-ion diffusion in LiNi0.1MgxCo0.9−xO2 (0≤ x ≤ 0.2) — for high energy Li-ion batteries
Nano-Structures & Nano-Objects Pub Date : 2020-09-03 , DOI: 10.1016/j.nanoso.2020.100559
Arockia Shyamala Paniyarasi S. , Arlyn Sneha J. , Padmaja S. , Pushpa Selvi M. , Sinthika S. , Nimma Elizabeth R.

Layered nano-sized LiNi $_{0.1}$ Mg $_{x}$ Co $_{0.9−x}$ O₂ (0 $\leq$ $x$ $\leq$ 0.2) cathode materials for Li-ion batteries with very low nickel content were prepared by a self-sustaining solution combustion method. The structural and morphological properties were examined by various characterization techniques such as X-ray Diffraction (XRD) technique, Scanning Electron Microscopy (SEM) and Infrared Spectroscopy. The experimental outcomes portray that the synthesized cathode materials show evidence of $α$ -NaFeO₂ structure despite doping of the electrochemically inactive metal (Mg) element. Electrochemical experiments revealed that LiNi $_{0.1}$ Mg $_{0.2}$ Co $_{0.7}$ O $_{2}$ electrode delivered a discharge capacity of 236mAhg⁻¹ at its initial stage and exhibited high cycling stability. The stable electrochemical reversibility of the LiNi $_{0.1}$ Mg $_{0.2}$ Co $_{0.7}$ O₂ electrode is clearly evident from the cyclic voltammogram and the electrode was found to exhibit a significantly low charge transfer resistance of 57.40 ohms. The Li-ion diffusion coefficient of the electrode was found to increase from 7.78 × 10⁻¹⁴cm²s⁻¹ to 5.70 × 10⁻¹³cm²s⁻¹ with Mg doping. The partial substitution of Co with Mg enhanced the electrochemical behavior of LiNi $_{0.1}$ Mg $_{x}$ Co $_{0.9−x}$ O₂ (0 $\leq$ $x$ $\leq$ 0.2) cathode materials.

中文翻译：

通过促进锂离子在LiNi中的扩散增强电化学性能 $_{0.1}$ 镁 $_{X}$ 有限公司 $_{0.9−x}$ O ₂（0 $\leq$ $X$ $\leq$ 0.2）—用于高能锂离子电池

层状纳米LiNi $_{0.1}$ 镁 $_{X}$ 有限公司 $_{0.9−x}$ O ₂（0 $\leq$ $X$ $\leq$ 0.2）通过自持溶液燃烧法制备镍含量极低的锂离子电池正极材料。通过各种表征技术（例如X射线衍射（XRD）技术，扫描电子显微镜（SEM）和红外光谱）检查了结构和形态特性。实验结果表明，合成的阴极材料显示出 $α$ -NaFeO ₂结构，尽管掺杂了电化学惰性金属（Mg）元素。电化学实验表明，LiNi $_{0.1}$ 镁 $_{0.2}$ 有限公司 $_{0.7}$ Ø $_{2}$ 电极在初始阶段的放电容量为236mAhg ^-1，并显示出高循环稳定性。LiNi的稳定电化学可逆性 $_{0.1}$ 镁 $_{0.2}$ 有限公司 $_{0.7}$ 从循环伏安图可清楚地看出O ₂电极，并且发现该电极显示出非常低的57.40欧姆的电荷转移电阻。发现通过掺杂Mg ，电极的Li离子扩散系数从7.78×10 ^-14 cm ² s ^-1增加到5.70×10 ^-13 cm ² s ^-1。用镁部分取代钴增强了LiNi的电化学行为 $_{0.1}$ 镁 $_{X}$ 有限公司 $_{0.9−x}$ O ₂（0 $\leq$ $X$ $\leq$ 0.2）正极材料。

更新日期：2020-09-03

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