Effect of synthesis temperature on the structural defects of integrated spinel-layered Li1.2Mn0.75Ni0.25O2+δ: a strategy to develop high-capacity cathode materials for Li-ion batteries

Vu, Ngoc Hung; Arunkumar, Paulraj; Im, Won Bin; Ngo, Duc Tung; Hằng, Lê Thị Thu; Park, Chan‐Jin

doi:10.1039/c7ta04002d

Cited by 24 publications

(21 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These Li‐rich cathode materials may be considered as two interpenetrating lattices of the monoclinic C 2 /m Li 2 MnO 3 structure and the trigonal R‐ 3 m LiMO 2 structure . The Li 2 MnO 3 is irreversibly activated to Li x MnO y at potentials higher than 4.5 V versus Li/Li + . The high‐voltage redox reaction consists of the following steps, assuming that it is run to completion at 4.6 V: LiMO 2 = > MO 2 + Li + + e − for C 2/ m structure, and Li 2 MnO 3 = > MnO 2 + 2Li + + 1/2O 2 + 2e − for the R ‐3 m structure.…”

Section: Introductionmentioning

confidence: 99%

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Zhang

Mitlin

et al. 2018

Small

View full text Add to dashboard Cite

Lithium-rich Li[Li Fe Ni Mn ]O (0.4Li MnO -0.6LiFe Ni Mn O , LFNMO) is a new member of the xLi MnO ·(1 - x)LiMO family of high capacity-high voltage lithium-ion battery (LIB) cathodes. Unfortunately, it suffers from the severe degradation during cycling both in terms of reversible capacity and operating voltage. Here, the corresponding degradation occurring in LFNMO at an atomic scale has been documented for the first time, using high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), as well as tracing the elemental crossover to the Li metal anode using X-ray photoelectron spectroscopy (XPS). It is also demonstrated that a cobalt phosphate surface treatment significantly boosts LFNMO cycling stability and rate capability. Due to cycling, the unmodified LFNMO undergoes extensive elemental dissolution (especially Mn) and O loss, forming Kirkendall-type voids. The associated structural degradation is from the as-synthesized R-3m layered structure to a disordered rock-salt phase. Prior to cycling, the cobalt phosphate coating is epitaxial, sharing the crystallography of the parent material. During cycling, a 2-3 nm thick disordered Co-rich rock-salt structure is formed as the outer shell, while the bulk material retains R-3m crystallography. These combined cathode-anode findings significantly advance the microstructural design principles for next-generation Li-rich cathode materials and coatings.

show abstract

Section: Introductionmentioning

confidence: 99%

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Zhang

Mitlin

et al. 2018

Small

View full text Add to dashboard Cite

show abstract

“…All peaks are sharp, indicating the high crystallinity of particles. Note that the ratio of LiMnO 2 to Li 2 MnO 3 phase can be changed by using an oxidizing agent [15] or controlling the synthesis temperature [16]. The ICP result shows that the ratio of Li : Mn = 1:095 : 1 due to the existence of the Li 2 MnO 3 phase.…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Synthesis of Li2MnO3-Stabilized LiMnO2 as a Cathode Material for Li-Ion Battery

Dao

et al. 2021

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

Herein, we reported the composite structure of LiMnO2 and Li2MnO3 as a low-cost and environmentally benign cathode material. This composite with the main phase of LiMnO2 (90%) was synthesized by hydrothermal method at 220°C from LiOH and Mn(CH3COO)2 precursors. The obtained nanosized LiMnO2-LiMnO3 cathode material exhibits a high capacity of 265 mAh g-1 at C/10. The incorporation of Li2MnO3 into the LiMnO2 phase could stabilize the structure, leading to the improved cycle stability of the cathode. The capacity retention of the cathode was 93% after 80 cycles at C/2. Our results facilitate a potential strategy for developing high-performance cathode materials based on the Li-Mn-O system.

show abstract

“…Moreover, the spinel phase can stabilize the layered component at high potentials and vice versa, improving the cathode cycling stability. [10,[13][14][15][16][17] Finally, the morphology and size of particles significantly influence the electrochemical properties of cathode materials. Nanometer-sized materials will have a large surface area, increasing contact with the electrolyte, thereby reducing the charge transfer resistance.…”

Section: Introductionmentioning

confidence: 99%

Spinel‐layered Li₂MnTiO₄_+z cathode material for Li‐ion batteries prepared by a sol‐gel method

Hung,

Van‐Duong,

Trang

2020

Vietnam Journal of Chemistry

View full text Add to dashboard Cite

Herein, the sol‐gel method is conducted to synthesize the spinel‐layered Li2MnTiO4+z (0.5LiMnTiO4•0.5Li2Mn0.5Ti0.5O3) nanoparticles as a cathode material for Li‐ion batteries. The structural and electrochemical properties of the material are investigated by means of X‐ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, and charge‐discharge tests. The obtained sample shows a high capacity of 200 mAh g‐1 with a capacity retention of 90 % after 60 cycles at C/5.

show abstract

Effect of synthesis temperature on the structural defects of integrated spinel-layered Li_1.2Mn_0.75Ni_0.25O_2+δ: a strategy to develop high-capacity cathode materials for Li-ion batteries

Abstract: An integrated layered-spinel of (1 − x)Li1.2Mn0.6Ni0.2O2·xLiMn1.5Ni0.5O4 (0.15 < x < 0.3) was synthesized by a hydrothermal reaction followed by firing at different temperatures.

Cited by 24 publications

References 58 publications

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Hydrothermal Synthesis of Li2MnO3-Stabilized LiMnO2 as a Cathode Material for Li-Ion Battery

Spinel‐layered Li₂MnTiO₄_+z cathode material for Li‐ion batteries prepared by a sol‐gel method

Contact Info

Product

Resources

About

Effect of synthesis temperature on the structural defects of integrated spinel-layered Li1.2Mn0.75Ni0.25O2+δ: a strategy to develop high-capacity cathode materials for Li-ion batteries

Abstract: An integrated layered-spinel of (1 − x)Li1.2Mn0.6Ni0.2O2·xLiMn1.5Ni0.5O4 (0.15 < x < 0.3) was synthesized by a hydrothermal reaction followed by firing at different temperatures.

Cited by 24 publications

References 58 publications

Li‐Rich Li[Li1/6Fe1/6Ni1/6Mn1/2]O2 (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Li‐Rich Li[Li1/6Fe1/6Ni1/6Mn1/2]O2 (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Hydrothermal Synthesis of Li2MnO3-Stabilized LiMnO2 as a Cathode Material for Li-Ion Battery

Spinel‐layered Li2MnTiO4+z cathode material for Li‐ion batteries prepared by a sol‐gel method

Contact Info

Product

Resources

About

Effect of synthesis temperature on the structural defects of integrated spinel-layered Li_1.2Mn_0.75Ni_0.25O_2+δ: a strategy to develop high-capacity cathode materials for Li-ion batteries

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Li‐Rich Li[Li_1/6Fe_1/6Ni_1/6Mn_1/2]O₂ (LFNMO) Cathodes: Atomic Scale Insight on the Mechanisms of Cycling Decay and of the Improvement due to Cobalt Phosphate Surface Modification

Spinel‐layered Li₂MnTiO₄_+z cathode material for Li‐ion batteries prepared by a sol‐gel method