Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries

Grillet, Anne M.; Humplik, Thomas; Stirrup, Emily K.; Roberts, Scott A.; Barringer, David A.; Snyder, Chelsea M.; Janvrin, Madison R.; Apblett, Christopher A.

doi:10.1149/2.0341609jes

Title: Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries

Abstract

The polymer-composite binder used in lithium-ion battery electrodes must both hold the electrodes together and augment their electrical conductivity while subjected to mechanical stresses caused by active material volume changes due to lithiation and delithiation. We have discovered that cyclic mechanical stresses cause significant degradation in the binder electrical conductivity. After just 160 mechanical cycles, the conductivity of polyvinylidene fluoride (PVDF):carbon black binder dropped between 45–75%. This degradation in binder conductivity has been shown to be quite general, occurring over a range of carbon black concentrations, with and without absorbed electrolyte solvent and for different polymer manufacturers. Mechanical cycling of lithium cobalt oxide (LiCoO2) cathodes caused a similar degradation, reducing the effective electrical conductivity by 30–40%. Mesoscale simulations on a reconstructed experimental cathode geometry predicted the binder conductivity degradation will have a proportional impact on cathode electrical conductivity, in qualitative agreement with the experimental measurements. Lastly, ohmic resistance measurements were made on complete batteries. Direct comparisons between electrochemical cycling and mechanical cycling show consistent trends in the conductivity decline. This evidence supports a new mechanism for performance decline of rechargeable lithium-ion batteries during operation – electrochemically-induced mechanical stresses that degrade binder conductivity, increasing the internal resistance of the battery withmore » cycling.« less

Authors:

Grillet, Anne M. ^[1]; Humplik, Thomas ^[1]; Stirrup, Emily K. ^[1];

^[1]; Barringer, David A. ^[1]; Snyder, Chelsea M. ^[2]; Janvrin, Madison R. ^[1]; Apblett, Christopher A. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Rensselaer Polytechnic Institute, Troy, NY (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Publication Date:: 2016-07-02

Research Org.:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1262307

Report Number(s):: SAND-2016-6356J
Journal ID: ISSN 0013-4651; 643788

Grant/Contract Number:: AC04-94AL85000

Resource Type:: Accepted Manuscript

Journal Name:: Journal of the Electrochemical Society

Additional Journal Information:: Journal Volume: 163; Journal Issue: 9; Journal ID: ISSN 0013-4651

Publisher:: The Electrochemical Society

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 25 ENERGY STORAGE; binder; composite; degradation; electrical conductivity; lithium ion battery; polyvinylidene fluoride

Citation Formats


                    Grillet, Anne M., Humplik, Thomas, Stirrup, Emily K., Roberts, Scott A., Barringer, David A., Snyder, Chelsea M., Janvrin, Madison R., and Apblett, Christopher A.. Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries.  United States: N. p., 2016. 
Web.  doi:10.1149/2.0341609jes.

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                    Grillet, Anne M., Humplik, Thomas, Stirrup, Emily K., Roberts, Scott A., Barringer, David A., Snyder, Chelsea M., Janvrin, Madison R., & Apblett, Christopher A.. Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries.  United States.  https://doi.org/10.1149/2.0341609jes

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                    Grillet, Anne M., Humplik, Thomas, Stirrup, Emily K., Roberts, Scott A., Barringer, David A., Snyder, Chelsea M., Janvrin, Madison R., and Apblett, Christopher A.. Sat .  
"Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries".  United States.  https://doi.org/10.1149/2.0341609jes.  https://www.osti.gov/servlets/purl/1262307.

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@article{osti_1262307,

  title        = {Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries},

  author       = {Grillet, Anne M. and Humplik, Thomas and Stirrup, Emily K. and Roberts, Scott A. and Barringer, David A. and Snyder, Chelsea M. and Janvrin, Madison R. and Apblett, Christopher A.},

  abstractNote = {The polymer-composite binder used in lithium-ion battery electrodes must both hold the electrodes together and augment their electrical conductivity while subjected to mechanical stresses caused by active material volume changes due to lithiation and delithiation. We have discovered that cyclic mechanical stresses cause significant degradation in the binder electrical conductivity. After just 160 mechanical cycles, the conductivity of polyvinylidene fluoride (PVDF):carbon black binder dropped between 45–75%. This degradation in binder conductivity has been shown to be quite general, occurring over a range of carbon black concentrations, with and without absorbed electrolyte solvent and for different polymer manufacturers. Mechanical cycling of lithium cobalt oxide (LiCoO2) cathodes caused a similar degradation, reducing the effective electrical conductivity by 30–40%. Mesoscale simulations on a reconstructed experimental cathode geometry predicted the binder conductivity degradation will have a proportional impact on cathode electrical conductivity, in qualitative agreement with the experimental measurements. Lastly, ohmic resistance measurements were made on complete batteries. Direct comparisons between electrochemical cycling and mechanical cycling show consistent trends in the conductivity decline. This evidence supports a new mechanism for performance decline of rechargeable lithium-ion batteries during operation – electrochemically-induced mechanical stresses that degrade binder conductivity, increasing the internal resistance of the battery with cycling.},

  doi          = {10.1149/2.0341609jes},

  journal      = {Journal of the Electrochemical Society},

  number       = 9,

  volume       = 163,

  place        = {United States},

  year         = {2016},

  month        = {7}

}

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Works referencing / citing this record:

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Title: Conductivity degradation of polyvinylidene fluoride composite binder during cycling: Measurements and simulations for lithium-ion batteries

Abstract

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