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SCIENCE CHINA Technological Sciences, Volume 62 , Issue 8 : 1331-1340(2019) https://doi.org/10.1007/s11431-018-9480-8

Electrochemomechanical performance of porous electrode incorporating binder network

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  • ReceivedOct 19, 2018
  • AcceptedMar 4, 2019
  • PublishedJul 2, 2019

Abstract

This paper proposes a theory for the random generation of porous electrodes to study the electrochemomechanical performance of Li-ion batteries. A new model is developed to explore the effects of the binder network and size polydispersity of electrode particles on the mechanical states under galvanostatic and potentiostatic charging. The quantity of binder, connecting position, contact area, and the angle between the binder and electrode particles exert considerable influence on the electrochemomechanical state of the electrode. Debonding at the interface between the binder and electrode particles is highly likely to occur under galvanostatic charging. Under potentiostatic charging, hoop stress experiences complex compressive-tensile conversion along the interface, which is prone to induce wrinkling and failure of the binder. The model and results are expected to be fundamental to studying real commercial porous electrodes in detail.


Funded by

the National Natural Science Foundation of China(Grant,Nos.,11472165,11332005)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (Grant Nos. 11472165, 11332005).


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  • Figure 1

    (Color online) (a) Optical electron microscopy image of commercial graphite porous electrode; (b) false-color maps of fluorine distribution [34], which corresponds to the amount of binder, with white and red colors representing less and more concentrated binder content, respectively; (c) corresponding RVE of (b); (d) and (e) focused ion beam/scanning electron microscopy images of electrodes [1921]; (f) schematic diagram of a typical binder-included particle system.

  • Figure 2

    (Color online) Statistical analysis of particle size distribution of our RVE in comparison with that of a commercial graphite porous electrode [9].

  • Figure 3

    (Color online) Selected electrode particles representative in terms of their connecting position and quantity of binder (a). Concentration distribution within five representative electrode particles when Q equals 60% and the C-rate is 0.2C under galvanostatic charging (b).

  • Figure 4

    (Color online) Radial stress in binder (a) and electrode particle (b), hoop stress in binder (c) and electrode particle (d) when Q equals 60% and the C-rate is 0.2C under galvanostatic charging.

  • Figure 5

    (Color online) Evolution of maximum stress. (a) Normalized radial stress on both sides of the interface as the C-rate increases from 0.2C to 1C; (b) hoop stress on both sides of the interface during charging at different C-rates.

  • Figure 6

    (Color online) Li-ion distribution when Q equals 60% under potentiostatic charging.

  • Figure 7

    (Color online) Radial stress of (a) binder G1 and (b) electrode particle F1; hoop stress of (c) binder G1 and (d) electrode particle F1 when Q equals 60% under potentiostatic charging.

  • Figure 8

    (Color online) Evolution of maximum hoop stress at both sides of the interface during potentiostatic charging.

  • Table 1   Electrochemical and mechanical properties of graphite electrode and PVDF

    Parameter

    Graphite electrode

    PVDF

    Maximum Li-ionconcentration cmax

    30535 mol/m3[39]

    Partial molar volume Ω

    3.17×10–6 m3 mol–1 [39]

    Elastic modulus E

    10 GPa [39]

    2 GPa [40]

    Poisson’s ratio ν

    0.3 [39]

    0.34 [40]

    Diffusivity D

    9.5×10–13 m2 s–1 [39]

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