MnO powder as anode active materials for lithium ion batteries

Zhong, Kaifu; Xia, Xin; Zhang, Bin; Li, Hong; Wang, Zhaoxiang; Chen, Liquan

doi:10.1016/j.jpowsour.2009.11.133

Cited by 351 publications

(303 citation statements)

References 33 publications

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“…Using the 'fingerprint' of the Mn K-edge XAS, we can easily exclude the possibility of MnO 2 . 35,36 A small positive shift of the absorption edge compared with pristine MnO@C could be related to the pulverization of the MnO during the charge/discharge process. 37 The radial-structure functions of the Mn K-edge (Figure 8c) Tuning MnO nanowire synthesis seeded by Si particles H Wei et al demonstrate the obvious increase in the peak height at 1.5 angstroms, implying an increase in the ordering of the O 2 À ions in the MnO structure, which induces the fast diffusion of Li ions and a low internal resistance.…”

Section: Electrochemical Properties Of Mno@c Nanowirementioning

confidence: 99%

Tuning ultrafine manganese oxide nanowire synthesis seeded by Si particles and its superior Li storage behaviors

Wei

et al. 2016

NPG Asia Mater

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The nanostructure and the dimension of materials greatly affect their performance and function. It is important to develop synthesis strategies that enable the control of the materials' morphology and structure and further reduce their size. In the present work, we report a novel synthesis approach that utilizes Si nanoparticles for synthesizing ultrafine MnO nanowires. The resulting nanostructure comprises MnO nanowires with a diameter of~5-10 nm embedded in an amorphous carbon matrix. X-ray diffraction patterns and high-resolution transmission electron microscopy images clearly reveal the growth mechanism of nanowires. As an anode material for the lithium-ion battery, the nanostructure exhibits excellent charge transfer kinetics and extremely high electrochemical performance, including reversible specific capacities of 285.9 mA h g − 1 at 30 A g − 1 and 757.4 mA h g − 1 at 1 A g − 1 after 1000 cycles. X-ray absorption fine structure (XAFS) confirms that the enhanced performance is related to the increase of the ordering of the O 2 − ions in the MnO structure during the charge/discharge processes. This novel synthesis strategy may inspire studies of other transition-metal-oxide nanomaterials with special orientation to tune their physical chemistry properties.

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Section: Electrochemical Properties Of Mno@c Nanowirementioning

confidence: 99%

Tuning ultrafine manganese oxide nanowire synthesis seeded by Si particles and its superior Li storage behaviors

Wei

et al. 2016

NPG Asia Mater

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“…39 For this reason, cell potentials computed from equilibrium free 44 The solid red line represents the best fit to Eq. 8.…”

Section: Resultsmentioning

confidence: 99%

Role of Metal-Lithium Oxide Interfaces in the Extra Lithium Capacity of Metal Oxide Lithium-Ion Battery Anode Materials

Bhasker-Ranganath

Hassan

Ramachandran

et al. 2016

J. Electrochem. Soc.

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Lithium storage capacities beyond the stoichiometric limit of conversion have been reported for the transition metal oxides MnO, CoO, NiO, CuO, and beyond the alloying limit for the main group metal oxide SnO. This work examines the molecular mechanisms responsible for this extra capacity using first principles plane wave density functional theory with periodic boundary conditions. Energies of the optimized structures were employed to construct first discharge curves. Analysis of lithiated structures of transition metal oxides with moderate lithium content revealed the formation of two different phases within the electrode material, namely bulk metal and lithium oxide, Li 2 O. At higher lithium content, the interfacial region between the two phases was found to expand, giving rise to "free volume" for additional lithium storage. MnO had the highest free volume in the interfacial region for lithium storage, followed by CoO, NiO, CuO, and SnO. Of particular interest was CuO, which upon lithiation, formed linear and branched chains of Cu atoms that percolated throughout a large portion of the system. This behavior suggests that CuO may better maintain conductivity through the anode material for more cycles than the other transition metal oxides examined. Lithium ion batteries (LiBs) are commonly used as sources of power in portable electronics because of their high gravimetric capacity and power density, owing to the lighter molecular weight of lithium.1 Commercially available LiBs typically use graphite as the anode, LiCoO 2 as the cathode, and LiPF 6 in alkyl carbonate solvents as the electrolyte.2 The choice of materials for different components of LiBs, such as electrodes, electrolyte, current collectors, and the interactions between them, determine the overall battery performance. Increased energy demands have intensified the efforts to improve commercially available LiBs, especially to power electric vehicles and for load leveling applications.3 Materials with higher capacities than that of graphite and LiCoO 2 have been studied as electrode materials to improve the energy density of LiBs. 4,5 Different classes of materials that have been synthesized and tested for their electrochemical performance as prospective anode materials can be broadly divided into three classes based on their reactivity with lithium: intercalation, alloying, and conversion materials.6 Apart from carbon-based compounds, oxides of titanium that store lithium by means of intercalation have been studied because of their stability, wide availability, low cost, and good reversible capacity at an operating potential of 1.5 V vs Li/Li + . 7 But their theoretical capacity, which is lower than that of graphite (372 mAh g -1 ), and poor electronic conductivity have limited their application in high energy density LiBs. Alloying anode materials such as Si, Sb, Sn, SiO, SnO 2 , and Ge have higher theoretical capacities than graphite, but are limited by high volume expansion and high irreversible capacity losses after first cycle. 8Research has be...

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“…One small peak was observed at 0.7 V, but then disappeared in the subsequent cycles, corresponding to the irreversible reduction of electrolyte and the formation of SEI layer. 15,36 In Fig. 7b, there was a noticeable reduction peak near 0.25 V in the first cathodic sweep, which corresponds to the reduction of Mn 2+ to metallic Mn 0 (MnO + 2Li + + 2e Mn + Li 2 O).…”

Section: Aggregation Of Mno Particles and Accommodate The Volume Chanmentioning

confidence: 97%

In Situ Self-Developed Nanoscale MnO/MEG Composite Anode Material for Lithium-Ion Battery

Zheng

Yang

et al. 2016

J. Electrochem. Soc.

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Nanoscale MnO mildly expanded graphite (MnO/MEG) composites were synthesized by a facile hydrothermal method combined with a subsequent self-reduction process using MEG as the raw material. The physicochemical and electrochemical properties of this novel MnO/MEG composite were characterized by X-ray diffraction, scanning electron microscopy, galvanostatic charge/discharge tests, cyclic voltammetry, and electrochemical impedance spectroscopy measurements. MnO/MEG exhibits excellent electrochemical performance for which the reversible capacity is as high as 931 mAh g −1 at 0.3 C after 450 cycles, which can be attributed to nanoscale MnO on MEG and self-developed graphene during the charge/discharge process.

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MnO powder as anode active materials for lithium ion batteries

Cited by 351 publications

References 33 publications

Tuning ultrafine manganese oxide nanowire synthesis seeded by Si particles and its superior Li storage behaviors

Tuning ultrafine manganese oxide nanowire synthesis seeded by Si particles and its superior Li storage behaviors

Role of Metal-Lithium Oxide Interfaces in the Extra Lithium Capacity of Metal Oxide Lithium-Ion Battery Anode Materials

In Situ Self-Developed Nanoscale MnO/MEG Composite Anode Material for Lithium-Ion Battery

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