A series of single-crystal, Ni-rich Li[NixCoyMn1–x–y]O2 (NCM) cathodes (x = 0.7, 0.8, and 0.9) with particle diameters of ∼3 μm are systematically compared with polycrystalline cathodes with corresponding Ni contents. Despite their high resistance to microcracking, the electrochemical performances of single-crystal NCM cathodes, in terms of capacity and cycling stability, are inferior to those of polycrystalline NCM cathodes. In situ XRD and TEM analyses reveal that the lithium concentrations in single-crystal NCM cathodes become spatially inhomogeneous during cycling; this phenomenon is exacerbated by high C rates and Ni contents, resulting in the coexistence of phases with widely different unit cell dimensions within a single cathode particle. This coexistence of two phases induces nonuniform stress that generates structural defects, impairing the diffusion of lithium ions and, eventually, leading to rapid capacity fading.

Hoon-Hee Ryu

Been Namkoong

Jae-Hyung Kim

Ilias Belharouak

Chong S. Yoon

Yang-Kook Sun

ACS Energy Letters

ACS ENERGY LETTERS 发表的论文报告了能源研究各个方面的新科学进展。下面列出了与能量捕获、转换和存储相关的主题。能源材料、光捕获组件能量转换过程（催化和光催化）太阳能燃料（制氢、减少二氧化碳）无机、有机和混合光伏光合作用和生物燃料燃料电池、蓄电池和超级电容器等离子、OLED 和光显示系统串联器件、压电和热电过程

ACS Energy Letters publishes papers reporting new scientific advancements in various aspects of energy research. The topics covered include energy capture, conversion, and storage, such as energy materials, light-harvesting components, energy conversion processes (catalysis and photocatalysis), solar fuels (hydrogen production, carbon dioxide reduction), inorganic, organic, and hybrid photovoltaics, photosynthesis and biofuels, fuel cells, batteries, and supercapacitors, plasma, OLEDs and optical display systems, tandem devices, piezoelectric and thermoelectric processes.

《ACS Energy Letters》发表关于能源研究各个方面的新科学进展的论文。主要涵盖以下主题：能量捕获、转换和存储，包括能源材料、光捕获组件、能量转换过程（催化和光催化）、太阳能燃料（制氢、减少二氧化碳）、无机、有机和混合光伏、光合作用和生物燃料、燃料电池、蓄电池和超级电容器、等离子体、OLED和光显示系统、串联器件、压电和热电过程等。

Category	Quartile
材料科学	1
材料科学, 物理化学	1
材料科学, 电化学	1
材料科学, 能源与燃料	1
材料科学, 材料科学综合	1
材料科学, 纳米科技	1

Capacity Fading Mechanisms in Ni-Rich Single-Crystal NCM Cathodes

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Journal Info

Category	Quartile
NANOSCIENCE & NANOTECHNOLOGY	1