Cathode–Electrolyte Interphase of Ni-Rich Layered Oxides: Evolving Structure and Implication on Stability

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-02-11 DOI:10.1021/acs.nanolett.4c05838

Menghao Li, Xuming Yang, Xianbin Wei, Yuanmin Zhu, Xueliang Sun, M. Danny Gu

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Abstract

The cathode–electrolyte interphase (CEI) is recognized as a crucial component in battery systems; however, knowledge regarding its structure and function remains limited and often controversial. This study demonstrates the feasibility of revealing atomic-resolution CEI structures via cryogenic transmission electron microscopy (cryo-TEM). Using Ni-rich oxide (LiNi_0.8Co_0.1Mn_0.1O₂, NCM811) microparticles as the model cathode, ultrafine images of CEI were obtained, revealing its dynamic evolution over cycling and its impact on battery performance. In ethylene carbonate (EC)-based electrolytes, the CEI forms an amorphous organic-rich layer, while, in fluoroethylene carbonate (FEC)-based electrolytes, the CEI contains abundant LiF grains. Both CEIs thicken with cycling but exhibit different structural evolutions: the former adopts a mosaic structure, while the latter forms a dual-layer structure with a compact LiF inner layer. These unprecedented high-resolution images and comprehensive analysis advance the understanding of CEI dynamics, addressing existing controversies and providing insights for improving battery performance.

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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.