实现先进钠离子电池用锆替代 O3 型 NaNi1/3Fe1/3Mn1/3O2 正极材料的高稳定性

Chunyu Jiang, Yingshuai Wang, Yuhang Xin, Xiangyu Ding, Shengkai Liu, Yanfei Pang, Baorui Chen, Yusong Wang, Lei Liu, Feng Wu, Hongcai Gao
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引用次数: 0

摘要

我们采用固态反应法成功合成了一系列 O3 型 NaNi1/3Fe1/3Mn1/3-xZrxO2 (x = 0, 0.01, 0.02, 0.04) 阴极材料。能量色散光谱、X 射线衍射(XRD)和 X 射线光电子能谱结果证实,成功地将 Zr 元素掺入晶格以替代 Mn。由于 Zr4+ 的引入,实现了 O3-NaNi1/3Fe1/3Mn1/3O2 晶体结构的调制。通过增加 Zr4+ 的含量,钠扩散层的宽度扩大,从而促进了钠离子的扩散。因此,该材料的高速率能力显著增强。同时,增加 Zr4+ 的含量会显著降低过渡金属层中 TM-O 的平均键长和 TMO6 八面体的厚度,从而显著改善阴极材料的循环性能和结构稳定性。此外,原位 XRD 结果表明,O3-NaNi1/3Fe1/3Mn1/3-0.02Zr0.02O2(NFMZ2)的优化阴极成分在充放电过程中发生了 O3 → O3 + P3 → P3 → O3 + P3 → O3 的可逆相变。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Toward high stability of O3-type NaNi1/3Fe1/3Mn1/3O2 cathode material with zirconium substitution for advanced sodium-ion batteries

We successfully synthesized a series of O3-type NaNi1/3Fe1/3Mn1/3−xZrxO2 (x = 0, 0.01, 0.02, 0.04) cathode materials by the solid-state reaction method. Energy dispersion spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy results confirmed the successful incorporation of Zr elements into the lattice to substitute Mn. Due to the introduction of Zr4+, the crystal structure modulation of O3-NaNi1/3Fe1/3Mn1/3O2 has been realized. By increasing the Zr4+ content, the width of the sodium diffusion layer expands, thereby facilitating the diffusion of sodium ions. Consequently, the material exhibits a remarkable enhancement in high-rate capability. At the same time, increasing the Zr4+ content results in a notable decrease in both the average bond length of TM−O and the thickness of the TMO6 octahedron in the transition metal layer, resulting in a significant improvement in the cycling performance and structural stability of the cathode material. Additionally, the in-situ XRD results demonstrate that the optimized cathode composition of O3-NaNi1/3Fe1/3Mn1/3–0.02Zr0.02O2 (NFMZ2) undergoes a reversible phase transition of O3 → O3 + P3 → P3 → O3 + P3 → O3 during the charge–discharge process.

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Issue Information Front Cover: Carbon Neutralization, Volume 3, Issue 6, November 2024 Inside Back Cover Image: Carbon Neutralization, Volume 3, Issue 6, November 2024 Back Cover Image: Carbon Neutralization, Volume 3, Issue 6, November 2024 A chronicle of titanium niobium oxide materials for high-performance lithium-ion batteries: From laboratory to industry
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