Effects of W-doping on precursor growth of LiNi0.88Co0.09Mn0.03O2 and its electrochemical performance

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-04-01 DOI:10.1016/S1003-6326(24)66468-X

Lei CHENG , Yi ZHAO , Bin HUANG , Zao-wen ZHAO , Yan-wei LI , Wei LI

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Abstract

W-doped LiNi_0.88Co_0.09Mn_0.03O₂ cathodes were fabricated by using W-doped precursors. X-ray diffraction indicates that W-doping suppresses the crystal growth of the precursor along the direction perpendicular to c-axis. Scanning electron microscopy results show that the primary particles of the cathode become finer with the increase of W-doping amount. Electrochemical measurements prove the merits of the W-doped cathodes. The one with 0.4 wt.% W-doping shows significantly improved electrochemical properties compared with the pristine one. After 100 charge–discharge cycles at a high rate of 10C, it exhibits capacity retentions of 94.68% and 89.63% at 25 and 45 °C, respectively. The intergranular cracks after cycles are also suppressed by W-doping. Hence, profiting from the synergistic effect of component regulation and microstructure engineering by W-doping, the Li⁺ diffusion kinetics is boosted, and the structural stability is enhanced.

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掺杂 W 对 LiNi0.88Co0.09Mn0.03O2 的前驱体生长及其电化学性能的影响

利用掺杂 W 的前驱体制造了掺杂 W 的 LiNi0.88Co0.09Mn0.03O2 阴极。X 射线衍射表明，W 掺杂抑制了前驱体沿垂直于 c 轴方向的晶体生长。扫描电子显微镜结果表明，随着掺 W 量的增加，阴极的原生颗粒变得更细。电化学测量证明了掺 W 阴极的优点。与原始阴极相比，掺杂了 0.4 wt.% W 的阴极显示出明显改善的电化学特性。在 10C 的高速率下进行 100 次充放电循环后，它在 25°C 和 45°C 下的容量保持率分别为 94.68% 和 89.63%。掺杂 W 还抑制了循环后的晶间裂纹。因此，通过掺杂 W 发挥成分调节和微结构工程的协同作用，可以提高 Li+ 扩散动力学，增强结构稳定性。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.

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