Investigation of binder distribution in graphite anodes for lithium-ion batteries

Müller, Marcus; Pfaffmann, Lukas; Jaiser, S.; Baunach, Michael; Trouillet, Vanessa; Scheiba, Frieder; Scharfer, Philip; Schabel, Wilhelm; Bauer, Werner

doi:10.1016/j.jpowsour.2016.11.051

Cited by 151 publications

(147 citation statements)

References 14 publications

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“…Because PVdF‐HFP binders employ the high‐T b NMP as solvent medium instead of water, the drying parameters had to be adjusted accordingly. It has been observed previously that binders migrate during drying and might induce an inhomogeneous material distribution across the coating …”

Section: Resultsmentioning

confidence: 98%

Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation

et al. 2017

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Replacing the traditional PVdF(‐HFP) electrode binder with water‐soluble alternatives can potentially render electrode fabrication more environmentally benign. Herein, the surface layer formation of stored and cycled samples of two water‐based Li4Ti5O12 composites employing either poly(sodium acrylate) (PAA−Na) or sodium carboxymethyl cellulose (CMC−Na) as binders are studied with X‐ray photoelectron spectroscopy. In all three formulations, the surface layer composition formed upon storage differed notably from the solid‐electrolyte interphase (SEI) layer formed on cycled samples. The surface layer under open‐circuit conditions seems to originate mostly from the electrolyte salt (LiPF6) degradation. The comparison with cycled samples after 10 and 100 cycles shows a continuous build‐up of an SEI layer on PAA−Na and PVdF‐HFP electrodes. In contrast, on CMC−Na containing electrodes the SEI composition remains nearly unchanged. The results correlate well with the electrochemical behavior.

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Section: Resultsmentioning

confidence: 98%

Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation

et al. 2017

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“…Between casting and film solidification, the particles and the binder are still mobile, and hence, material redistribution may occur . For instance, Schabel and co‐workers recently reported on the mobility of PVdF and mixtures of CMC‐Na and SBR in graphite slurries depending on the drying conditions . The maximum tensile forces for the three electrode formulations are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Water‐Soluble Binders for Lithium‐Ion Battery Graphite Electrodes: Slurry Rheology, Coating Adhesion, and Electrochemical Performance

et al. 2017

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Water‐processable composite electrodes are attractive both ecologically and economically. The binders sodium carboxymethyl cellulose (CMC‐Na) and poly(sodium acrylate) (PAA‐Na) were shown to have improved electrochemical performance over conventional binders. In many studies, a binder content of approximately 10 wt % has been applied, which is not suitable for large‐scale electrode production due to viscosity and energy‐density considerations. Therefore, we examined herein three electrode formulations with binder contents of 4 wt %, namely, CMC‐Na:SBR (SBR=styrene butadiene rubber), PAA‐Na, and CMC‐Na:PAA‐Na, on both laboratory and pilot scales. The formulations were evaluated on the basis of slurry rheology, coating adhesion, and electrochemical behavior in half‐ and full‐cells. CMC‐Na:SBR composites provided the best coating adhesion, independent of the mass loading and scale, and also showed the best capacity retention after 100 cycles. Previously reported merits of better cycling efficiencies and solid–electrolyte interphase formation for graphite–PAA composites appeared to vanish upon reducing the binder content to realistic levels.

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“…In composite electrodes, condition (2) is more likely to be observed if the binder phase is concentrated at the contact spots between the particles and between current collector surface and the first layer of particles, rather than being homogeneously distributed over the surface of particles. [38,39] A lower tendency to segregation is seen for high molecular weight binder, as a consequence of multiple binding to the particles. The amount of binder that is adsorbed on the particles in the slurry depends on the polymer molecular structure, the solvent properties and the surface chemistry of the particles.…”

Section: Introductionmentioning

confidence: 99%

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

Hernandez

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Douillard

et al. 2017

Advanced Energy Materials

130

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It is well known that the mechanical properties of lithium‐ion battery electrodes impact their electrochemical performance. This is especially critical for Si‐based negative electrodes, which suffer from large volume changes of the active mass upon cycling. Here, this study presents a postprocessing treatment (called maturation) that improves the mechanical and electrochemical stabilities of silicon‐based anodes made with an acidic aqueous binder. It consists of storing the electrode in a humid atmosphere for a few days before drying and cell assembly. This results in a beneficial in situ reactive modification of the interfaces within the electrode. First, the binder tends to concentrate at the silicon interparticle contacts. As a result, the cohesion of the composite film is strengthened. Second, the corrosion of the copper current collector, inducing the formation of copper carboxylate bonds, improves the adhesion of the composite film. The great improvement of the mechanical stability of the matured electrode is confirmed by in‐operando optical microscopy showing the absence of film delamination. The result is a significant electrochemical performance gain, up to a factor 10, compared to a not‐matured electrode. This maturation procedure can be applied to other types of electrodes for improving their electrochemical performance and also their handling during cell manufacturing.

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Investigation of binder distribution in graphite anodes for lithium-ion batteries

Cited by 151 publications

References 14 publications

Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation

Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation

Water‐Soluble Binders for Lithium‐Ion Battery Graphite Electrodes: Slurry Rheology, Coating Adhesion, and Electrochemical Performance

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

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Investigation of binder distribution in graphite anodes for lithium-ion batteries

Cited by 151 publications

References 14 publications

Different Shades of Li4Ti5O12 Composites: The Impact of the Binder on Interface Layer Formation

Different Shades of Li4Ti5O12 Composites: The Impact of the Binder on Interface Layer Formation

Water‐Soluble Binders for Lithium‐Ion Battery Graphite Electrodes: Slurry Rheology, Coating Adhesion, and Electrochemical Performance

A Facile and Very Effective Method to Enhance the Mechanical Strength and the Cyclability of Si‐Based Electrodes for Li‐Ion Batteries

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Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation

Different Shades of Li₄Ti₅O₁₂ Composites: The Impact of the Binder on Interface Layer Formation