Clarifying the Roles of Cobalt and Nickel in the Structural Evolution of Layered Cathodes for Sodium-Ion Batteries

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2021-11-08 DOI:10.1021/acs.nanolett.1c03285

Duojie Wu, Xuming Yang, Shihui Feng, Yuanmin Zhu, Meng Gu*

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引用次数: 10

Abstract

Layered sodium manganese-based oxides are appealing cathode candidates due to their high capacity and cost-effectiveness, yet performance degradation related with unwanted structural evolution still remains a disturbing disadvantage. Herein, atomic resolution STEM (scanning transmission electron microscopy) images of Na-extracted Na2/3NixCo1/3-xMn2/3O2 (x = 0, 1/6, 1/3) are collected and analyzed, to decipher the effect of cobalt and nickel substitution on the structural integrity of layered manganese-based oxides. Cobalt substitution is demonstrated to alleviate the lattice stress and retain the layered structure after sodium removal, and only a local P2-to-O2 phase transition could be identified. By contrast, various types of defects and phase transformation, including rarely reported P2-to-O3, are discovered in the Ni-substituted oxides. The generation of spinel and rock-salt phases is the critical evidence of cation mixing that leads to unrecoverable capacity loss. The interplay of different transition metals is complex, and compositional optimization is encouraged to minimize the effect of the concomitant phase transition.

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阐明钴和镍在钠离子电池层状阴极结构演变中的作用

层状锰基钠氧化物由于其高容量和成本效益而成为极具吸引力的阴极候选材料，但与不必要的结构演变相关的性能下降仍然是一个令人不安的缺点。本文收集并分析了na提取的Na2/3NixCo1/3-xMn2/3O2 (x = 0,1 / 6,1 /3)的原子分辨率STEM(扫描透射电子显微镜)图像，以解读钴和镍取代对层状锰基氧化物结构完整性的影响。除钠后，钴取代减轻了晶格应力，保留了层状结构，只发现了局部的p2到o2相变。相比之下，在ni取代的氧化物中发现了各种类型的缺陷和相变，包括很少报道的p2到o3。尖晶石相和岩盐相的生成是导致不可恢复的容量损失的阳离子混合的关键证据。不同过渡金属的相互作用是复杂的，并且鼓励成分优化，以尽量减少伴随相变的影响。

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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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.