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High performance TiP2O7 nanoporous microsphere as anode material for aqueous lithium-ion batteries

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  • ReceivedJul 13, 2018
  • AcceptedOct 25, 2018
  • PublishedDec 21, 2018

Abstract


Funded by

the National Natural Science Foundation of China(21333002)

and the National Key Research and Development Plan(2016YFB0901500)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (21333002), and the National Key Research and Development Plan (2016YFB0901500).


Interest statement

The authors declare that they have no conflict of interest.


Contributions statement

These authors contributed equally to this work.


References

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  • Figure 1

    (a) Rietveld refinement of the XRD pattern of TPO-NMS sample; (b, c) the corresponding structures of TiP2O7 (color online).

  • Scheme 1

    Schematic presentation of the synthesis process of carbon-coated TiP2O7 nanoporous microsphere (TPO-NMS) (color online).

  • Figure 2

    TG curve of the TPO-NMS.

  • Figure 3

    SEM images of TPO-NMS for (a) the secondary microsphere and (b) primary nanoparticles; (c) cross-section SEM image of one single secondary microsphere and (d) its magnified image.

  • Figure 4

    (a) SEM image of TPO-NMS for the one single secondary microsphere and (b) EDX elemental mapping of Ti, P, O and C elements (color online).

  • Figure 5

    TEM images of TPO-NMS (color online).

  • Figure 6

    (a) N2 sorption isotherm and (b) pore size distribution of TPO-NMS sample.

  • Figure 7

    (a) Charge/discharge curve of TPO-NMS at 0.2 A/g between 1.5 and 3.5 V in organic electrolyte; (b) cycling performance of TPO-NMS at 0.1 A/g in organic electrolyte (color online).

  • Figure 8

    (a) Charge-discharge curves of TPO-NMS in 1 M Li2SO4 under nitrogen atmosphere within the voltage of −0.8 and 0 V at various current rates; (b) cycle performance of TPO-NMS in 1 M Li2SO4 solution at the rate of 0.5 A/g (color online).

  • Figure 9

    Typical charge/discharge curves of the individual electrode TPO-NMS and LiMn2O4 (vs. SCE) along with the voltage profile of the aqueous lithium-ion battery in the range of 0.5−1.7 V at a current rate of 0.2 A/g.

  • Figure 10

    (a) Charge/discharge curves and (b) capacity retention plots of TPO-NMS//LiMn2O4 cell at different rates; (c) cycle performance of TPO-NMS//LiMn2O4 cell at 0.5 A/g for 1000 cycles (color online).

  • Table 1   Crystallographic parameters for the TiPO phase based on the Rietveld refinement of the XRD data

    Parameters

    data

    Radiation

    X-ray (Bruker D8 Advance X)

    Crystal system

    Cubic

    Space group

    Pa3

    Lattice parameters

    a=b=c=23.63094 Å, α=β=γ=90°

    Cell volume

    13196.03 Å3

    λ

    1.5406 Å

    Rwpa)

    5.365%

    Rpa)

    3.758%

    χ2a)

    1.4276

    Rwp=ω(I0IC)2/(ωI02)1/2; Rp=|I0IC|/IC; χ2=ω (I0IC)2/(NobsNvar).

  • Table 2   Comparison of electrochemical performance of TiPO composites synthesized through different process in organic electrolytes

    Composition

    Synthesis method

    Voltage

    (V)

    Current density

    Capacity (mA h/g)

    (cycle number)

    Capacity retention

    Submicro-TPO [22]

    Liquid-assisted method (900 °C-6 h in air)

    2.0–3.4

    15 mA/g

    94(100)

    76.12%

    Nano-TPO [35]

    Urea assisted combustion synthesis (900 °C-6 h in air)

    2.0–3.4

    15 mA/g

    69(100)

    87.0%

    Planar TPO electrode [34]

    Plasma-enhanced atomic layer deposition process

    2.3–3.2

    100 mA/g

    120(100)

    97.8%

    Low temperature TPO [23]

    Low temperature synthesis (800 °C-2 h)

    1.5–3.5

    5 mA/g

    120(100)

    75%

    Flower-like TPO/C [33]

    Solvothermal method (750 °C-4 h in N2)

    1.5–3.5

    200 mA/g

    600 mA/g

    1000 mA/g

    123(200)

    90(400)

    84(100)

    93.2%

    94.4%

    98.4%

    TPO/Li2.6Co0.4N [36]

    Co-precipitation method (600 °C-3 h in air)

    0.02–1.5

    0.4 mA/cm2

    647.54(20)

    98%

    Ti3O5/TPO@MPCNFs [37]

    Electrospinning, sol-gel ripening

    0.001–3.0

    50 mA/g

    713.3/509.3(100)

    52.5%

    TPO/EG [20]

    Liquid-assisted method (750 °C-5 h in Ar)

    1.5–3.5

    100 mA/g

    75(500)

    88%

    TPO-NMS (our work)

    Solid-phase combined with spray drying method

    1.5–3.5

    100 mA/g

    81(500)

    88%