Coaxial MnO/N-doped carbon nanorods for advanced lithium-ion battery anodes

Gu, Xin; Yue, Jie; Chen, Liang; Liu, Shuo; Xu, Huajun; Yang, Jian; Qian, Yitai; Zhao, Xuebo

doi:10.1039/c4ta05622a

Cited by 190 publications

(131 citation statements)

References 31 publications

(32 reference statements)

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“…The strategies to develop alternative anode materials with improved capacity have been achieved for several decades. [1][2][3][4][5][6][7][8] Among them, nanoscale metal oxides, including MnO, [9] SnO 2 , [10,11] Co 3 O 4 , [12] NiO, [13] and Fe 3 O 4 , [14,15] used as anode active materials for LIBs have been paid much attention attributed to their promising theoretical capacity. However, in most cases, the capacity decays rapidly as cycled due to high electrical resistivity and mechanism failure.…”

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confidence: 99%

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Yao

et al. 2017

Global Challenges

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the theoretical capacity of graphite electrodes is 372 mAh g −1 , resulted in an obstacle for their potential applications. The strategies to develop alternative anode materials with improved capacity have been achieved for several decades. [1][2][3][4][5][6][7][8] Among them, nanoscale metal oxides, including MnO, [9] SnO 2 , [10,11] Co 3 O 4 , [12] NiO, [13] and Fe 3 O 4 , [14,15] used as anode active materials for LIBs have been paid much attention attributed to their promising theoretical capacity. However, in most cases, the capacity decays rapidly as cycled due to high electrical resistivity and mechanism failure. [16] Molybdenum oxide (MoO 2 ) is different from other metal oxides. It possesses metallic conductivity (its electrical resistivity is 8.8 × 10 −5 Ω cm at 300 K in bulk sample), with a theoretical capacity as high as 836 mAh g −1 . [17] However, the capacity of bulk MoO 2 is low due to sluggish lithiation/delithiation kinetics. [17][18][19][20] On the other hand, the nanoporous structure constructed with lots of interconnect nanounits to form numbers of nanoscale pore provides adequate spaces for electrochemical reaction and connected pathways for ion diffusion. [21,22] The nano-MoO 2 porous structures have been synthesized by using mesoporous silica as hard templates, followed removing this hard templates by hydrofluoric acid, [23] or by a sulfur-assisted decomposition process. [24] The prepared MoO 2 porous materials have displayed improved capacity for LIBs. However, the capacity fade after charge/discharge process is attributed to the pure MoO 2 skeleton that will be possibly collapsed. The cycle stability needs to be improved further. It should be desired for the MoO 2 porous structure with flexible supports via retarding the pulverization from pure MoO 2 skeleton.Carbon nanomaterials, especially, graphene with large specific surface area and high toughness, are suitable for both substrates and supports for MoO 2 electrode active materials. However, owing to graphene being liable to stack together, it is difficult to prepare well distributed graphene templated metal oxide architectures. The strategies, including solid-state graphenothermal reduction method, [25] microwave-assisted hydrothermal process, [26] and soft-templated hydrothermal method, [27] have been used to synthesize MoO 2 /C nanocomposites, exhibiting promising performance for LIBs. In our present

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Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Yao

et al. 2017

Global Challenges

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“…Furthermore, this type of N-doped carbon possesses more Li storage sites than graphitic carbon, increasing its capacity as stored in carbon. [19][20][21][22] The carbon contents of the samples were determined by TG analysis. All samples were heated to 800 o C at a temperature ramp of 10 o C min -1 under an air flow.…”

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confidence: 99%

MnO nanocrystals incorporated in a N-containing carbon matrix for Li ion battery anodes

et al. 2016

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In this study, MnO nanocrystals as-incorporated in N-containing carbon matrix were fabricated by a facile thermal decomposition of manganese nitrate-glycine gels.MnO/C composites with different carbon contents were prepared by controlling the initial ratio of manganese to glycine. The composition, phase structure and morphology of the composites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning and transmission electron microscopy, and thermogravimetric analysis. The results indicated that MnO nanocrystals were uniformly embedded in the N-doped carbon matrix. The carbon matrix could effectively enhance the electrical conductivity of MnO and alleviate the strain arising from the discharge/charge cycling. The composite materials exhibited high discharge/charge capacities, superior cycling performance, and excellent rate capability. A high reversible capacity of 556 mAh g -1 was obtained after 110 cycles of discharge and charge at a current rate of 0.5 A g -1 . Even at a high current rate of 3 A g -1 , the sample still delivered a capacity of around 286 mAh g -1 . The easy production and superior electrochemical properties enables the composites to be promising candidates as an anode alternative for high-performance lithium-ion batteries.

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“…Currently, much effort has been made to solve these problems for MnO. An effective approach is combining MnO with a carbonaceous matrix (such as carbon covered, [18][19][20] graphite, 21 graphene, 16,22 carbon nanotubes, 15,23,24 China fir, 17 microalgaes, 25 etc. ), which act as both a volume buffer and a conductive network to increase the electrical conductivity.…”

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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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Coaxial MnO/N-doped carbon nanorods for advanced lithium-ion battery anodes

Abstract: N-carbon-encapsulated MnO coaxial nanorods are prepared using polypyrrole-coated MnOOH coaxial nanorods as a template and precursor. The excellent performance of coaxial nanorods is attributed to the synergistic effect of one-dimensional structure and the N-doped carbon coating.

Cited by 190 publications

References 31 publications

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

MnO nanocrystals incorporated in a N-containing carbon matrix for Li ion battery anodes

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

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Coaxial MnO/N-doped carbon nanorods for advanced lithium-ion battery anodes

Abstract: N-carbon-encapsulated MnO coaxial nanorods are prepared using polypyrrole-coated MnOOH coaxial nanorods as a template and precursor. The excellent performance of coaxial nanorods is attributed to the synergistic effect of one-dimensional structure and the N-doped carbon coating.

Cited by 190 publications

References 31 publications

Constructing MoO2 Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Constructing MoO2 Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

MnO nanocrystals incorporated in a N-containing carbon matrix for Li ion battery anodes

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

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Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes

Constructing MoO₂ Porous Architectures Using Graphene Oxide Flexible Supports for Lithium Ion Battery Anodes