Physical and electrochemical properties of spherical Li1+x(Ni1/3Co1/3Mn1/3)1−xO2 cathode materials

Park, S. H.; Kang, Suk Hoon; Belharouak, Ilias; Sun, Yang Kook; Amine, Khalil

doi:10.1016/j.jpowsour.2007.10.062

Cited by 149 publications

(88 citation statements)

References 19 publications

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“…These spherical carbonate precursors are comprised of nanosized primary grainagglomerates, which is consistent with previous reports. [33][34][35] Figure 2c,d displayst he SEM images of the cathode materials CSLM and CL. The spherical morphology is well-maintained after calcination, but some small holes can be observed in the surfaces of the cathode materials, which may arise from CO 2 escaping during the high-temperature calcination.…”

Section: Resultsmentioning

confidence: 99%

“…In addition, the slopes that represent the concentration changes of the metal elements (Mg and Ni)i nC SP are greater than those of the CSLM cathode material, because the high lithiation temperature can causeadirectional migration of the metal elements during calcination. Figure 4e xhibits the XRD patterns for the as-obtained precursors andc athode materials.A si llustrated in Figure 4a,b oth of the precursors (CSP and CP) contain as ingle phase, and both of them have typical hexagonal structures with the space group of R3c, [34] corresponding to MnCO 3 rhodochrosite. [36] Furthermore, all diffraction peaks of CSP and CP are broad,a nd this phenomenon may be ascribed to the mixture of nanoscale primaryg rains that constitute the precursors.…”

Section: Resultsmentioning

confidence: 99%

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Design and Preparation of a Lithium‐rich Layered Oxide Cathode with a Mg‐Concentration‐Gradient Shell for Improved Rate Capability

Wang

et al. 2015

ChemElectroChem

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Fluorescence imaging enables the uniquely sensitive observation of functional‐ and molecular‐recognition events in living cells. However, only a limited range of biological processes have been subjected to imaging because of the lack of a design strategy and difficulties in the synthesis of biosensors. Herein, we report a facile synthesis of emission‐tunable and predictable Seoul‐Fluors, 9‐aryl‐1,2‐dihydrolopyrrolo[3,4‐b]indolizin‐3‐ones, with various R1 and R2 substituents by coinage‐metal‐catalyzed intramolecular 1,3‐dipolar cycloaddition and subsequent palladium‐mediated CH activation. We also showed that the quantum yields of Seoul‐Fluors are controlled by the electronic nature of the substituents, which influences the extent of photoinduced electron transfer. On the basis of this understanding, we demonstrated our design strategy by the development of a Seoul‐Fluor‐based chemosensor 20 for reactive oxygen species that was not accessible by a previous synthetic route.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Design and Preparation of a Lithium‐rich Layered Oxide Cathode with a Mg‐Concentration‐Gradient Shell for Improved Rate Capability

Wang

et al. 2015

ChemElectroChem

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“…In LiCo 1/3 Ni 1/3 Mn 1/3 O 2 the transition metals are in the following oxidation states: Co(III), Ni(II) and Mn(IV). The preparation of an over lithiated material Li 1+x Co 1/3 Ni 1/3 Mn 1/3 O 2 was shown [9][10] to improve the structure ordering and enhance the cathode cycling and rate capability. In the present paper we are reporting the LiCo 1/3 Ni 1/3 Mn 1/3 O 2 compound synthesized through solid state reaction at 900 °C for 18 hours followed by structural characterization, conductivity and dielectric studies at different temperature and frequency by impedance spectroscopy and the magnetic properties through ESR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Structural, Morphological, Magnetic and Impedance Studies of Layered LiNi1/3Co1/3Mn1/3O2 Cathode Material for Lithium Ion Batteries

2017

Chem Sci Trans

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LiNi 1/3 Co 1/3 Mn 1/3 O 2 was synthesized by solid state reaction method and the effect of calcination temperature on characteristics of LiNi 1/3 Co 1/3 Mn 1/3 O 2 cathode was investigated. Thermal analysis reveals the temperature dependence of the materials properties. The phase composition, micro-morphology, elemental analysis and Wyckoff sites of the products were characterized by xray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectra (EDS) and Fourier transform infrared (FTIR) respectively. The results of XRD pattern possessed the α-NaFeO 2 structure of the hexagonal system (space group m R 3 ). The morphological features of the powders were characterized by scanning electron microscopy (SEM). The EDS spectra confirm the presence of Ni, Co, Mn and O in the compound. The FT-IR spectroscopic data reveals that the structure of the oxide lattice constituted by LiO 6 , NiO 6, CoO 6 and MnO 6 octahedral. The variation of the ac conductivity, dielectric constant and electric modulus as function of frequency and temperature was determined to study the electrical properties of the synthesized sample. Electron spin resonance (ESR) was carried out to study the magnetic properties as well. From this study, we conclude that the layered LiNi 1/3 Co 1/3 Mn 1/3 O 2 material prepared by solid-state reaction method at 900 °C for 18h is promising next-generation cathode material for lithium ion batteries.

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“…Many studies have shown that the electrochemical performance of the final product strongly depends on the properties of the precursor, such as morphology [10][11][12][13], size of the primary and secondary particles [13][14][15][16], size distribution [17], composition [6,8,9,[18][19][20][21], as well as structure [22,23]. Therefore, it is vital to control the precursor in order to obtain the materials with excellent performance, for which a simple and controlled preparation method is highly required.…”

Section: Introductionmentioning

confidence: 99%

Controllable Hydrothermal Conversion from Ni-Co-Mn Carbonate Nanoparticles to Microspheres

2016

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Abstract:Starting from Ni-Co-Mn carbonate nanoparticles prepared by microreaction technology, uniform spherical particles of Ni 1/3 Co 1/3 Mn 1/3 CO 3 with a size of 3-4 µm were obtained by a controllable hydrothermal conversion with the addition of (NH 4 ) 2 CO 3 . Based on characterizations on the evolution of morphology and composition with hydrothermal treatment time, we clarified the mechanism of this novel method as a dissolution-recrystallization process, as well as the effects of (NH 4 ) 2 CO 3 concentration on the morphology and composition of particles. By changing concentrations and the ratio of the starting materials for nano-precipitation preparation, we achieved monotonic regulation on the size of the spherical particles, and the synthesis of Ni 0.4 Co 0.2 Mn 0.4 CO 3 and Ni 0.5 Co 0.2 Mn 0.3 CO 3 , respectively. In addition, the spherical particles with a core-shell structure were preliminarily verified to be available by introducing nano-precipitates with different compositions in the hydrothermal treatment in sequence.

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Physical and electrochemical properties of spherical Li1+x(Ni1/3Co1/3Mn1/3)1−xO2 cathode materials

Cited by 149 publications

References 19 publications

Design and Preparation of a Lithium‐rich Layered Oxide Cathode with a Mg‐Concentration‐Gradient Shell for Improved Rate Capability

Design and Preparation of a Lithium‐rich Layered Oxide Cathode with a Mg‐Concentration‐Gradient Shell for Improved Rate Capability

Structural, Morphological, Magnetic and Impedance Studies of Layered LiNi1/3Co1/3Mn1/3O2 Cathode Material for Lithium Ion Batteries

Controllable Hydrothermal Conversion from Ni-Co-Mn Carbonate Nanoparticles to Microspheres

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