Fluorinated Mn3O4 nanospheres for lithium-ion batteries: Low-cost synthesis with enhanced capacity, cyclability and charge-transport

Palaniyandy, Nithyadharseni; Nkosi, Funeka P.; Raju, Kumar; Ozoemena, Kenneth I.

doi:10.1016/j.matchemphys.2018.01.003

Cited by 24 publications

(6 citation statements)

References 59 publications

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“…In addition, the peaks of 288.8, 284.6, and 286.2 eV are assigned to CO, C–C, and C–O, respectively, which are in agreement with the previous report . The Mn 2p 3/2 peak at 641.1 eV and the Mn 2p 1/2 peak at 652.8 eV are contributed to a splitting width of 12.7 eV, which is in agreement with the fact that Mn has two stable valence states in the film …”

Section: Resultssupporting

confidence: 91%

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Chen

Xiao

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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Mn3O4 is regarded as a promising anode material for lithium-ion batteries (LIBs) based on its ultrahigh theoretical capacity (937 mAh g–1) and low cost but suffers from poor electronic conductivity and large volume variation during the lithiation/delithiation process, which result in dramatic capacity fading and inferior rate capability. Ti3C2T x MXene, a novel two-dimensional transition metal carbide with metallic conductivity, excellent mechanical properties, and hydrophilic surface, could be an ideal candidate to improve the lithium storage performance of Mn3O4. Here, a unique flexible, 2D–2D Mn3O4/MXene film is fabricated by assembling 2D Mn3O4 with Ti3C2T x nanosheets through a simple vacuum filtration approach. In this unique 2D–2D nanostructure, MXene nanosheets buffer the volume change of Mn3O4 during the charge/discharge process. Moreover, the introduction of MXene enables the fabricated 2D–2D nanostructure with excellent flexibility and can be directly used as an electrode for LIBs, which is beneficial for enhancing the energy density of the assembled batteries. As a result, the flexible film of Mn3O4-MXene-8-2 shows excellent lithium storage performances in terms of specific capacity (931 mAh g–1 at 0.05 A g–1), rate capability (624 mAh g–1 at 1 A g–1), and cycling stability, demonstrating its great potential for the application in LIBs.

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Section: Resultssupporting

confidence: 91%

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Chen

Xiao

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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“…As previously reported by Liu et al., Li intercalation into MoO 2 occurs in two steps wherein monoclinic MoO 2 is first reduced to orthorhombic Li x MoO 2 (0.45< x <0.78) followed by a further reduction to a second monoclinic phase (Li x MoO 2 , x= 0.98) . Each sample also showed an irreversible cathodic peak at around 0.6 V vs. Li/Li + during the first scan, which is attributed to the formation of the solid–electrolyte interphase (SEI) layer . Redox processes associated with the conversion reactions [Equations (8) and (9)] were also observed at potentials <0.8 V vs. Li/Li + for the BMA‐MoO 2 and fluorinated samples but were absent for pristine MoO 2 (Figure a).…”

Section: Resultssupporting

confidence: 64%

“…[55,57] Each sample also showeda ni rreversible cathodic peak at around 0.6 Vv s. Li/Li + during the first scan, which is attributed to the formation of the solid-electrolyte interphase (SEI) layer. [55,[58][59][60] Redox processes associatedw ith the conversion reactions [Equations (8) and (9)] werea lso observed at potentials < 0.8 Vv s. Li/Li + for the BMA-MoO 2 and fluorinated samples but were absent for pristine MoO 2 (Figure 7a). In addition to charges torage through the MoO 2 phase, the fluorinated phases in F-BMA-MoO 2 @145 and F-BMA-MoO 2 @180 may also be redox-active, with plausible Li storage reactions given in Equations (10) and 11:…”

Section: Resultsmentioning

confidence: 99%

Synthesizing High‐Capacity Oxyfluoride Conversion Anodes by Direct Fluorination of Molybdenum Dioxide (MoO₂)

et al. 2020

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High‐capacity metal oxide conversion anodes for lithium‐ion batteries (LIBs) are primarily limited by their poor reversibility and cycling stability. In this study, a promising approach has been developed to improve the electrochemical performance of a MoO2 anode by direct fluorination of the prelithiated MoO2. The fluorinated anode contains a mixture of crystalline MoO2 and amorphous molybdenum oxyfluoride phases, as determined from a suite of characterization methods including X‐ray diffraction, Raman spectroscopy, and X‐ray photoelectron spectroscopy, and scanning transmission electron microscopy. Electrochemical measurements indicate that fluorination facilitates the conversion reaction kinetics, which leads to increased capacity, higher coulombic efficiency, and better cycling stability as compared to the nonfluorinated samples. These results suggest that fluorination after prelithiation not only favors formation of the oxyfluoride phase but also improves the lithium‐ion diffusivity and reversibility of the conversion reaction, making it an attractive approach to address the problems of conversion electrodes. These findings provide a new route to design high‐capacity negative electrodes for LIBs.

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“…The spin-energy separation of as-prepared and calcined samples are 11.6 and 11.4 eV and these values are in very good agreement with reported literature data, indicating 4 + oxidation states of Mn. [22][23][24][25][26] Also, the obtained fluorine content in both samples, may be from the PVDF or electrolyte solution, however, the intensity of fluorine peak was decreased in the calcined sample. This results indicates that the regenerated LMO from spent LIBs is pure phase of LMO with minor impurities of F, N and P.…”

Section: Resultsmentioning

confidence: 99%

A Facile Segregation Process and Restoration of LiMn₂O₄Cathode Material From Spent Lithium-Ion Batteries

Palaniyandy

Rambau

Musyoka

et al. 2020

J. Electrochem. Soc.

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Due to its three-dimensional tunnel structure, the spinel LiMn2O4 (LMO) cathode material is highly favourable for the migration of lithium ions. Thus, LMO has been used as a commercial cathode material for the electronic devices such as mobile phones and electric vehicles, owing to its special characteristics of low-cost, eco-friendly and non-toxic. However, the scarcity of lithium resources makes the system expensive. On the other hand, the tremendous and increasing usage of lithium ion batteries (LIBs) has undoubtedly generated a significant amount of spent LIBs, resulting in resource waste and environmental pollution. Therefore, in this work, we report on the recycling process of LMO from the spent LIBs and mainly devote to re-examine the electrochemical performances of the regenerated LMO cathode material, for the first time. It is noticed that, the renovated spinel LMO exhibits a better cycling stability up to 500 cycles, with the discharge capacity of 56 mAh g−1 and retained almost 100% of its initial capacity cycled at 1.0 C.

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Fluorinated Mn3O4 nanospheres for lithium-ion batteries: Low-cost synthesis with enhanced capacity, cyclability and charge-transport

Cited by 24 publications

References 59 publications

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Synthesizing High‐Capacity Oxyfluoride Conversion Anodes by Direct Fluorination of Molybdenum Dioxide (MoO₂)

A Facile Segregation Process and Restoration of LiMn₂O₄Cathode Material From Spent Lithium-Ion Batteries

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Fluorinated Mn3O4 nanospheres for lithium-ion batteries: Low-cost synthesis with enhanced capacity, cyclability and charge-transport

Cited by 24 publications

References 59 publications

Flexible Mn3O4/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Flexible Mn3O4/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Synthesizing High‐Capacity Oxyfluoride Conversion Anodes by Direct Fluorination of Molybdenum Dioxide (MoO2)

A Facile Segregation Process and Restoration of LiMn2O4Cathode Material From Spent Lithium-Ion Batteries

Contact Info

Product

Resources

About

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Flexible Mn₃O₄/MXene Films with 2D–2D Architectures as Stable and Ultrafast Anodes for Li-Ion Batteries

Synthesizing High‐Capacity Oxyfluoride Conversion Anodes by Direct Fluorination of Molybdenum Dioxide (MoO₂)

A Facile Segregation Process and Restoration of LiMn₂O₄Cathode Material From Spent Lithium-Ion Batteries