Single-crystal based studies for correlating the properties and high-voltage performance of Li[NixMnyCo1−x−y]O2 cathodes

Zhu, Jian; Chen, Guoying

doi:10.1039/c8ta10329a

Cited by 190 publications

(231 citation statements)

References 46 publications

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“…Soft XAS results are also in agreement with XRD results. The oxidation states of TM after the first and the second heat treatment were both confirmed to be +2 for Ni, +3 for Co, and +4 for Mn [72]. Although the 450 ℃ heat treated sample is still in mixed phase with NiO and the layered NMC, the oxidation state for Ni remains the same for both phases.…”

Section: Structural and Morphological Evolution During The Heat-treatmentioning

confidence: 78%

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

et al. 2019

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This work reports a comprehensive study of a novel polyol method that can successfully synthesize layered LiNi0.4Mn0.4Co0.2O2, spinel LiNi0.5Mn1.5O4, and olivine LiCoPO4 cathode materials. When properly designed, polyol method offers many advantages such as low cost, ease of use, and proven scalability for industrial applications. Most importantly, the unique properties of polyol solvent allow for great morphology control as shown by all the resulting materials exhibiting monodispersed nanoparticles morphology. This morphology contributes to improved lithium ion transport due to short diffusion lengths. Polyolsynthesized LiNi0.4Mn0.4Co0.2O2 delivers a reversible capacity of 101 and 82 mAh g -1 at the high current density of 1000 mA g -1 and 2000 mA g -1 , respectively. It also displays surprisingly high surface structure stability after charge-discharge process. Each step of the reaction was investigated to understand the underlying polyol synthesis mechanism. A combination of in situ and ex situ study reveals the structural and chemical transformation of Ni-Co alloy nanocrystals overwrapped by a Mn-and Li-embedded organic matrix to a series of intermediate phases, and then eventually to the desired layered oxide phase with a homogeneous distribution of Ni, Co, and Mn. We envisage that this type of analysis will promote the development of optimized synthesis protocol by establishing links between experimental factors and important structural and chemical properties of the desired product. The insights can open a new direction of research to synthesize high-performance intercalation compounds by allowing an unprecedented control of intermediate phases using experimental parameters.

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Section: Structural and Morphological Evolution During The Heat-treatmentioning

confidence: 78%

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

et al. 2019

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“…Considering all the discussions above, it is realizable that the surface/interface structure and chemistry play a key role in determining the ultimate electrochemical properties and physicochemical characteristics of the Ni-rich cathodes but still suffer from a series of issues to be addressed well. As a result, tremendous efforts have been dedicated to the regulation of synthetic conditions, [56,[203][204][205][206][207] foreign-ions doping, [132,135,[208][209][210][211] surface coating, [18,100,103,[212][213][214][215][216][217] concentration-gradient structure, [130,134,[218][219][220][221][222] construction of single-crystal structure, [223][224][225][226] as well as electrolyte additives. [227][228][229][230][231]…”

Section: Strategies To Mitigate the Surface/interface Structure Degramentioning

confidence: 99%

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Liang

Zhang

Zhao

et al. 2019

Adv Materials Inter

149

111

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Nickel‐rich layered transition‐metal oxides with high‐capacity and high‐power capabilities are established as the principal cathode candidates for next‐generation lithium‐ion batteries. However, several intractable issues such as the poor thermal stability and rapid capacity fade as well as the air‐sensitivity particularly for the Ni content over 80% have seriously restricted their broadly practical applications. The properties and nature of the stable surface/interface, where the Li+ shuttles back and forth between the cathode and electrolyte, play a significant role in their ultimate lithium‐storage performance and industrial processability. Thus, tremendous efforts are made to in‐depth understanding of the essential origins of surface/interface structure degradation and efficient surface modification methodologies are intensively explored. The purpose of the contribution is first to provide a comprehensive review of the up‐to‐date mechanisms proposed to rationally elucidate the surface/interface behaviors, and then, focus on recent developed strategies to optimize the surface/interface structure and chemistry including synthetic condition regulation, surface doping, surface coating, dual doping‐coating modification, and concentration‐gradient structure as well as electrolyte additives. Finally, the perspective on future research trends and feasible approaches toward advanced Ni‐rich cathodes with stable surface/interface is presented briefly.

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“…To determine the surface stability and the most dominant surface facet, we select six different surface facets: (104), (110), (100) for nonpolar surfaces and (003), (101), (012) for polar surfaces, based on previous theoretical and experimental studies. 29,49,50 The nonpolar surfaces correspond to the type 1 surface according to Tasker's classication scheme 51 with overall zero charge for each plane. The polar surfaces consist of a stacking sequence of charged planes with a nonzero net dipole moment.…”

Section: Computational Detailsmentioning

confidence: 99%

Enhancing surface oxygen retention through theory-guided doping selection in Li_1−xNiO₂ for next-generation lithium-ion batteries

Cheng

Wang

et al. 2020

J. Mater. Chem. A

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Single-crystal based studies for correlating the properties and high-voltage performance of Li[Ni_xMn_yCo_1−x−y]O₂ cathodes

Abstract: Particle surface design is shown to be essential in optimizing the performance and stability of NMC-type LIB cathode materials.

Cited by 190 publications

References 46 publications

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Enhancing surface oxygen retention through theory-guided doping selection in Li_1−xNiO₂ for next-generation lithium-ion batteries

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Single-crystal based studies for correlating the properties and high-voltage performance of Li[NixMnyCo1−x−y]O2 cathodes

Abstract: Particle surface design is shown to be essential in optimizing the performance and stability of NMC-type LIB cathode materials.

Cited by 190 publications

References 46 publications

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

Comprehensive study of a versatile polyol synthesis approach for cathode materials for Li-ion batteries

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Enhancing surface oxygen retention through theory-guided doping selection in Li1−xNiO2 for next-generation lithium-ion batteries

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Product

Resources

About

Single-crystal based studies for correlating the properties and high-voltage performance of Li[Ni_xMn_yCo_1−x−y]O₂ cathodes

Enhancing surface oxygen retention through theory-guided doping selection in Li_1−xNiO₂ for next-generation lithium-ion batteries