The roles of nickel/manganese in electrochemical cycling of lithium-rich Mn-based nickel cathode materials

Zheng, Zhuo; Liao, Shi-Xuan; Xu, Binbin; Zhong, Benhe

doi:10.1007/s11581-015-1575-z

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…The calculated oxidation state of transition metals (Ni and Mn) in the parent compound is confirmed by the X-ray photoelectron spectroscopy (XPS) analysis (Figure b). The core-level XPS peaks of Ni 2p 3/2 and Mn 2p 3/2 are observed at 854.5 and 642.2 eV, corresponding to Ni 2+ and Mn 4+ , respectively, which are in accordance with the previous reports. , …”

Section: Resultssupporting

confidence: 92%

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Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

et al. 2017

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The high capacity of Li-rich layered cathode materials is always accompanied by the removal of oxygen from the crystal structure. These oxygen vacancies alter the structural stability, which subsequently deteriorates the electrochemical performance. The electronic origin of oxygen stability with partial delithiation has not been extensively studied so far in the presence of multiple d-orbital elements. Current work presents the experimental and density functional theory based study of the Li-rich phase, Li1.17Ni0.17Mn0.67O2. This study reveals the lithium removal mechanism and its influence on the oxygen stability. Further, the study suggests how lithium removal from different lithium sites, i.e., 2b, 2c, and 4h Wyckoff positions, influence the partial intercalation potential. On higher degree of delithiation, electrochemical potential increases and oxygen binding energy decreases. Thus, the oxygen stability reduces in the compound. At this stage, the material becomes metallic with zero band gap, which facilitates oxygen loss. This affectively influences the charge transfer process and redox center of the compound, which has been captured in this study.

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Section: Resultssupporting

confidence: 92%

“…The core-level XPS peaks of Ni 2p 3/2 and Mn 2p 3/2 are observed at 854.5 and 642.2 eV, corresponding to Ni 2+ and Mn 4+ , respectively, which are in accordance with the previous reports. 28,29 Oxygen Binding Energy. Figure 6 depicts the calculated oxygen binding energy of Li x Ni 0.17 Mn 0.67 O 2 as a function of Li concentration (x).…”

Section: → +mentioning

confidence: 99%

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

et al. 2017

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“…Z′ : the real part of impedance, thus

σ

can be obtained from the linear fitting of Z′ vs. w −1/2 in the low frequency range shown in Figure b ,. The slope of two linear equations (the value of the

σ

) are 185.5 J s 1/2 C −2 and 388.46 J s 1/2 C −2 for the cathode material before cycles and after 40 cycles.…”

Section: Resultsmentioning

confidence: 99%

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Zheng

et al. 2017

ChemElectroChem

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Constructing hierarchical‐architecture primary nanoparticles that assemble with secondary micro‐architectures is very effective to achieve high‐performance cathode materials for lithium‐ion batteries (LIBs). In this work, well‐crystallized lithium‐rich layered oxide cathode materials Li1.2Ni0.2Mn0.6O2 (LNMO) with a micro‐architecture was successfully synthesized. The preparation process is divided into two steps: the solvothermal process synthesizes the precursor Ni0.25Mn0.75CO3 (NMCO) and gradient temperature calcination is used to prepare the primary nanoparticles that agglomerate into hierarchical microspheres for final‐product LNMO. The as‐prepared material was used as cathode materials for LIBs, which exhibit good cycle life and excellent rate performances. The material retains a fairly high discharge capacity of approximately 180 mAh g−1 after 180 cycles at the 2C rate (1C=200 mA g−1). Even after a 50‐fold (5C/0.1C) increase, a discharge capacity 61.4 % (153.8 mAh g−1) of the capacity at 0.1C (ca. 249.1 mAh g−1) could be retained. This superior cycle life and rate performance are attributed to the merits of the hierarchical nano‐/microsphere structures.

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“…Zheng Z. et al (2015) discussed that the roles and the functions of nickel in electrochemical cycling of lithium-rich Mn-based cathode materials. Yang et al (2017) reported that the Ni substitution at 2c sites not only enhances oxygen stability and delays oxygen loss from the lattice but also suppresses the cation mixing that induces the undesired phase transition.…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 Cathode Materials Synthesized by Using Different Lithium Sources

et al. 2018

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Lithium-rich manganese-based cathode materials has been attracted enormous interests as one of the most promising candidates of cathode materials for next-generation lithium ion batteries because of its high theoretic capacity and low cost. In this study, 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 materials are synthesized through a solid-state reaction by using different lithium sources, and the synthesis process and the reaction mechanism are investigated in detail. The morphology, structure, and electrochemical performances of the material synthesized by using LiOH·H2O, Li2CO3, and CH3COOLi·2H2O have been analyzed by using Thermo gravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscope (SEM), Transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and electrochemical measurements. The 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 material prepared by using LiOH·H2O displays uniform morphology with nano particle and stable layer structure so that it suppresses the first cycle irreversible reaction and structure transfer, and it delivers the best electrochemical performance. The results indicate that LiOH·H2O is the best choice for the synthesis of the 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 material.

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The roles of nickel/manganese in electrochemical cycling of lithium-rich Mn-based nickel cathode materials

Cited by 9 publications

References 24 publications

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Comparative Investigation of 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 Cathode Materials Synthesized by Using Different Lithium Sources

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The roles of nickel/manganese in electrochemical cycling of lithium-rich Mn-based nickel cathode materials

Cited by 9 publications

References 24 publications

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li1.17Ni0.17Mn0.67O2: Experimental and First-Principles Analysis

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li1.17Ni0.17Mn0.67O2: Experimental and First-Principles Analysis

Multistage Li1.2Ni0.2Mn0.6O2 Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Comparative Investigation of 0.5Li2MnO3·0.5LiNi0.5Co0.2Mn0.3O2 Cathode Materials Synthesized by Using Different Lithium Sources

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Resources

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Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

Li-Removal Mechanism and Its Effect on Oxygen Stability Influencing the Electrochemical Performance of Li_1.17Ni_0.17Mn_0.67O₂: Experimental and First-Principles Analysis

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries