Interaction between Poly(vinylidene fluoride) Binder and Graphite in the Anode of Lithium Ion Batteries: Rheological Properties and Surface Chemistry

MRS Proceedings ◽

10.1557/proc-730-v5.17 ◽

2002 ◽

Vol 730 ◽

Author(s):

Mikyong Yoo ◽

Curtis W. Frank

Keyword(s):

Rheological Properties ◽

Vinylidene Fluoride ◽

Chemical Properties ◽

Lithium Ion ◽

Composite Anode ◽

Film Properties ◽

Suspension Viscosity ◽

Poly Vinylidene Fluoride ◽

Slurry Viscosity ◽

Final Composite

AbstractWe describe here the interaction of poly(vinylidene fluoride) (PVDF) with graphite based on the rheological behavior of the slurries and the surface morphology of PVDF in the final composite anode. The rheological properties of slurries show the interaction between graphite and PVDF with the viscosity varying over six orders of magnitude for different graphite particles. We correlated the suspension viscosity with the final film properties. The homogeneity of the PVDF distribution in the final composite film increases as the slurry viscosity increases. The interaction between graphite and PVDF is altered through the chemical properties of polymer such as molecular weight and functionality, leading to an improved morphology of PVDF.

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Effect of poly(vinylidene fluoride) binder crystallinity and graphite structure on the mechanical strength of the composite anode in a lithium ion battery

Polymer ◽

10.1016/s0032-3861(03)00364-1 ◽

2003 ◽

Vol 44 (15) ◽

pp. 4197-4204 ◽

Cited By ~ 59

Author(s):

Mikyong Yoo ◽

Curtis W. Frank ◽

Shoichiro Mori ◽

Shoji Yamaguchi

Keyword(s):

Mechanical Strength ◽

Lithium Ion Battery ◽

Vinylidene Fluoride ◽

Lithium Ion ◽

Composite Anode ◽

Poly Vinylidene Fluoride ◽

Graphite Structure

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Electrophoretic Fabrication of Rechargeable Micro Lithium-Ion Battery with 3D Configuration

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.507.163 ◽

2012 ◽

Vol 507 ◽

pp. 163-167

Author(s):

Hirokazu Munakata ◽

Hiroya Kaido ◽

Kazuomi Yoshima ◽

Kiyoshi Kanamura

Keyword(s):

Electrode Materials ◽

Vinylidene Fluoride ◽

High Capacity ◽

Lithium Ion ◽

Composite Cathode ◽

Composite Anode ◽

Si Substrate ◽

Current Collectors ◽

Poly Vinylidene Fluoride ◽

Polymer Wall

A polymer wall was developed between interdigitated comb-type current collectors on a SiO2/Si substrate as the support for three-dimensionally (3D) accurate deposition of electrode materials by electrophoretic deposition (EPD) method. As anode and cathode materials, Li4Ti5O12 and LiCoO2 with a particle size of ~ 200 nm were synthesized, respectively, and their dispersibility in the suspensions including Ketjen Black and poly (vinylidene fluoride) was investigated. Consequently, N-methylpyrrolidone provided their good suspensions, and an electrode aspect ratio of 1:1, which can provide a high capacity and good rate performance to micro lithium-ion batteries, was successfully achieved in both Li4Ti5O12 composite anode and LiCoO2 composite cathode.

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Evolution of Internal Stress in Heterogeneous Electrode Composite during the Drying Process

Energies ◽

10.3390/en14061683 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1683

Author(s):

Zuoquan Zhu ◽

Yaolong He ◽

Hongjiu Hu ◽

Fangzhou Zhang

Keyword(s):

Internal Stress ◽

Vinylidene Fluoride ◽

Influence Factors ◽

Lithium Ion ◽

Integrated Analysis ◽

Drying Time ◽

Component Distribution ◽

Poly Vinylidene Fluoride ◽

Inactive Ingredients ◽

Main Influence

The mechanical behavior of electrode composite during the drying preparation has played a crucial role in the electrochemical performance of lithium-ion batteries (LIBs). Our work aimed at developing an integrated analysis method to study the component distribution, mechanical properties, and internal stress of composite coating in the process of electrode drying. The main influence factors of drying stress were thoroughly investigated. It was found that this present model could capture not only the heterogeneity effect of inactive ingredients but also the porosity-dependent viscoelasticity of electrode composite. Meanwhile, the calculated effective modulus and stress evolution upon drying time were in acceptable accord with the experimental data. Furthermore, the rapid solidification markedly increased the drying stress in electrodes and significantly impaired the tensile strength of electrode composite due to the highly gradient distributed constituents. However, the stress level at high drying temperature could be significantly reduced by an aqueous sodium alginate binder instead of poly(vinylidene fluoride). The obtained results will be a great help in efficiently manufacturing LIB electrodes with adequate mechanical integrity.

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