Li-rich and Ni-rich transition metal oxides: Coating and core-shell structures

Махонина, Е. В.; Maslennikova, L.S.; Volkov, V. V.; Medvedeva, A. A.; Rumyantsev, А. М.; Koshtyal, Yu. М.; Maximov, Maxim; Pervov, V. S.; Еременко, И. Л.

doi:10.1016/j.apsusc.2018.07.159

Cited by 32 publications

(21 citation statements)

References 43 publications

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“…The XRD peaks can be indexed based on a cell with trigonal (

) or monoclinic ( C 2/ m ) symmetry. According to our previous investigations of Li-rich oxides of the same composition using TEM with local electron diffraction [ 38 ], the oxides contained both structurally integrated phases: trigonal and monoclinic. This agreed with a large body of the literature [ 3 , 37 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

et al. 2022

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Li-rich Mn-based layered oxides are among the most promising cathode materials for next-generation lithium-ion batteries, yet they suffer from capacity fading and voltage decay during cycling. The electrochemical performance of the material can be improved by doping with Mg. However, the effect of Mg doping at different positions (lithium or transition metals) remains unclear. Li1.2Mn0.54Ni0.13Co0.13O2 (LR) was synthesized by coprecipitation followed by a solid-state reaction. The coprecipitation stage was used to introduce Mg in TM layers (sample LR-Mg), and the solid-state reaction (st) was used to dope Mg in Li layers (LR-Mg(st)). The presence of magnesium at different positions was confirmed by XRD, XPS, and electrochemical studies. The investigations have shown that the introduction of Mg in TM layers is preferable in terms of the electrochemical performance. The sample doped with Mg at the TM positions shows better cyclability and higher discharge capacity than the undoped sample. The poor electrochemical properties of the sample doped with Mg at Li positions are due to the kinetic hindrance of oxidation of the manganese-containing species formed after activation of the Li2MnO3 component of the composite oxide. The oxide LR-Mg(st) demonstrates the lowest lithium-ion diffusion coefficient and the greatest polarization resistance compared to LR and LR-Mg.

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“…The XRD peaks can be indexed based on a cell with trigonal (

Section: Resultsmentioning

confidence: 99%

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

et al. 2022

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“…At present, the preparation methods of LNMO mainly include high-temperature-solid-state method [13,14], hydrothermal method [5,15], co-precipitation method [16,17], sol-gel method [18,19], solvothermal method [20], template method [21][22][23], etc. However, most of the materials prepared by these methods have not 3D channels structure or porous structure.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hollow Three-Dimensional Channels LiNi0.5Mn1.5O4 Microsphere by PEO Soft Template Assisted with Solvothermal Method

Zeng

Liu

Zou

et al. 2021

Acta Metall. Sin. (Engl. Lett.)

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A appropriate size with three-dimension (3D) channels for lithium diffusion plays an important role in constructing highperforming LiNi 0.5 Mn 1.5 O 4 (LNMO) cathode materials, as it can not only reduce the transport path of lithium ions and electrons, but also reduce the side effects and withstand the structural strain in the process of repetitive Li + intercalation/ deintercalation. In this work, an efficient method for designing the hollow LNMO microsphere with 3D channels structure by using polyethylene oxide (PEO) as soft template agent assisted solvothermal method is proposed. Experimental results indicate that PEO can make the reagents mingle evenly and nucleate slowly in the solvothermal process, thus obtaining a homogeneous distribution of carbonate precursors. In the final LNMO products, the hollow 3D channels structure obtained by the decomposition of PEO and carbonate precursor in the calcination can provide abundant electroactive zones and electron/ion transport paths during the charge/discharge process, which benefits to improve the cycling performance and rate capability. The LNMO prepared by adding 1 g PEO possesses the most outstanding electrochemical performance, which presented an excellent discharge capacity of 143.1 mAh g −1 at 0.1 C and with a capacity retention of 92.2% after 100 cycles at 1 C. The superior performance attributed to the 3D channels structure of hollow microspheres, which provide uninterrupted conductive systems and therefore achieve the stable transfer for electron/ion.

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“…Typically, the synthesis of the LLO cathode materials has been done using the coprecipitation method. 6,11,14−18 Other methods that have been used in the synthesis of these materials are the combustion, 2,6,27 sol−gel, 10,21 solid-state, 16 and recently, the mechanochemical (ball-milling) method. 5,12−14 Although the coprecipitation method (like most wet chemical methods) leads to the production of fine particles, it requires long reaction time and careful control of the pH value, temperature, and concentration of the solution, which can complicate the process.…”

Section: ■ Introductionmentioning

confidence: 99%

Solution Combustion-Mechanochemical Syntheses of Composites and Core-Shell xLi₂MnO₃·(1 – x)LiNi_0.5Mn_0.3Co_0.2O₂ (0 ≤ x ≤ 0.7) Cathode Materials for Lithium-Ion Batteries

Ehi-Eromosele

Indris

Melinte

et al. 2020

ACS Sustainable Chem. Eng.

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A combination of the solution combustion and mechanochemical syntheses (SC-MS) presents a facile, low-energy, and cost-effective method to prepare layered lithium-rich oxide (LLO) composites and core-shell structures compared to the conventional methods of preparing these compounds. The composite and core-shell structures of xLi2MnO3·(1 – x)LiNi0.5Mn0.3Co0.2O2 (0 ≤ x ≤ 0.7) were prepared using optimized SC-MS and were comparatively characterized with respect to their morphology, chemical composition, and structural and electrochemical properties. Notably, the composite cathode materials show lower discharge capacities compared to the core-shell cathode materials with same target stoichiometry but comparable cycling stability, which was ascribed to their probably higher contents of Ni3+. Apart from giving larger unit cell volumes, the core-shell cathode materials with a Ni-rich core and a Mn-rich shell gave a combination of higher discharge capacity, good cyclability, lower irreversible capacity loss, better rate performance, and thermal stability. This confirms the efficiency of the core-shell strategy in improving the electrochemical performance of LLOs, especially for systems with a Ni-rich component. These results show that the SC-MS method could be used for the large-scale synthesis of electrode materials for high power Li-ion batteries.

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Li-rich and Ni-rich transition metal oxides: Coating and core-shell structures

Cited by 32 publications

References 43 publications

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Synthesis of Hollow Three-Dimensional Channels LiNi0.5Mn1.5O4 Microsphere by PEO Soft Template Assisted with Solvothermal Method

Solution Combustion-Mechanochemical Syntheses of Composites and Core-Shell xLi₂MnO₃·(1 – x)LiNi_0.5Mn_0.3Co_0.2O₂ (0 ≤ x ≤ 0.7) Cathode Materials for Lithium-Ion Batteries

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Li-rich and Ni-rich transition metal oxides: Coating and core-shell structures

Cited by 32 publications

References 43 publications

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Synthesis of Hollow Three-Dimensional Channels LiNi0.5Mn1.5O4 Microsphere by PEO Soft Template Assisted with Solvothermal Method

Solution Combustion-Mechanochemical Syntheses of Composites and Core-Shell xLi2MnO3·(1 – x)LiNi0.5Mn0.3Co0.2O2 (0 ≤ x ≤ 0.7) Cathode Materials for Lithium-Ion Batteries

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Solution Combustion-Mechanochemical Syntheses of Composites and Core-Shell xLi₂MnO₃·(1 – x)LiNi_0.5Mn_0.3Co_0.2O₂ (0 ≤ x ≤ 0.7) Cathode Materials for Lithium-Ion Batteries