Influence of high intensive dry mixing and calendering on relative electrode resistivity determined via an advanced two point approach

Westphal, Bastian; Mainusch, Nils; Meyer, Chris J.; Haselrieder, Wolfgang; Indrikova, Maira; Titscher, Paul; Bockholt, Henrike; Viöl, Wolfgang; Kwade, Arno

doi:10.1016/j.est.2017.02.001

Cited by 88 publications

(81 citation statements)

References 35 publications

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“…The geometrical porosity and the density of the coating were calculated using the coating thickness, the materials solids density, and the coating loading mass (see Appendix). The adhesion strength and the electrical resistance measurements were performed with a material testing machine (Z20, Zwick Roell). Ten samples each were measured for statistical reasons.…”

Section: Methodssupporting

confidence: 51%

Evaluation of a High‐Intensive Mixing Process in a Ring Shear Mixer and Its Impact on the Properties of Composite Particles for Lithium–Sulfur Battery Cathodes

et al. 2019

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The use of a high‐intensive ring shear mixing system to produce the composite materials from carbon black and sulfur for cathodes in lithium–sulfur batteries is described. The examined process is evaluated concerning its stress mechanism and its influence on the properties of the resulting composite materials. The architecture of the composites can be described as a core–shell structure, whose size and strength depend on the expended stress input from the mixing process. The comparison of electrodes from these composite particles with a reference cathode based on pure carbon black proves an increase in the energy density of approximately 30%. Furthermore, using the composite particles, a higher amount of additional carbon black enables an increase in the specific capacity of approximately 25% due to the improvement of the mechanical properties of the coating.

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Section: Methodssupporting

confidence: 51%

Evaluation of a High‐Intensive Mixing Process in a Ring Shear Mixer and Its Impact on the Properties of Composite Particles for Lithium–Sulfur Battery Cathodes

et al. 2019

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“…In detail, the used method for porosimetry is described by Froboese and Titscher et al Investigated pore sizes were in the range between 20 nm and x 90 of the PSD of active material. In addition to the electrode structure, electrode resistance was measured using an in‐house developed method described by Westphal et al utilizing a material testing machine (Zwick Roell, Z020) . A circular electrode sample is placed between two conducting probes that compress the sample using a constant contact pressure of 350 kPa.…”

Section: Methodsmentioning

confidence: 99%

Designing Graphite‐Based Positive Electrodes and Their Properties in Dual‐Ion Batteries Using Particle Size‐Adjusted Active Materials

et al. 2019

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In almost all state‐of‐the‐art lithium‐ion batteries, the negative electrode is made from graphite. For dual‐ion batteries (DIBs), graphite electrodes can even be used as negative and positive electrodes as the electrolyte provides both cations and anions for energy storage. As the amount of active material is very high in graphite electrodes, one of the main structure‐controlling parameters is its particle size distribution (PSD). Based on changes in the active material particle size and resulting changes in electrode structure, the corresponding cell characteristics like coulombic efficiency or power density are strongly affected. Herein, results for graphite positive electrodes manufactured with different PSDs of one typical commercial synthetic graphite are displayed. A high‐performance single‐wheel air classifier is used to create the differently distributed graphite particle fractions that do not vary in particle shapes for all fractions created. To gain a better understanding of the particle size impact on electrode properties, the electronic and mechanical properties, as well as the electrode structure, are investigated. The electrochemical performance of the Li metal/graphite system is correlated with structure properties influenced by PSD.

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“…Afterwards, a doctor blade process was utilized to manufacture the electrodes using aluminum foil as current collector and a constant drying temperature. The resistivity is correlated to the resistance of the electrode as a function of the thickness of the coating [32]. These results are shown in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…The electric resistance [32] and the adhesion force [33] of the coating were further measured using a two-point approach in a material testing machine (Zwick Roell). The pore size distribution of the materials was determined by mercury intrusion measurements (PoreMaster 60, Quantachrome).…”

Section: Characterization Of Composite Materials and Manufactured Coamentioning

confidence: 99%

Evaluation of Processes for Mechanical Manufacturing of Composite Materials for Li‐Sulfur Batteries

Titscher

Zellmer

Burmeister

et al. 2018

Chemie Ingenieur Technik

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Lithium-sulfur batteries are a promising alternative to lithium-ion batteries due to their low weight and the high availability of sulfur. In addition to research on material aspects, scalable processes are needed to manufacture tailored sulfur cathodes with high-energy densities. Therefore, this work focuses on the usage of mechanical processes to prepare defined carbon-sulfur composite materials that are subsequently processed to electrodes. DEM simulations are used to calculate the necessary power input and the resulting stress energy for different mechanical processes.

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Influence of high intensive dry mixing and calendering on relative electrode resistivity determined via an advanced two point approach

Cited by 88 publications

References 35 publications

Evaluation of a High‐Intensive Mixing Process in a Ring Shear Mixer and Its Impact on the Properties of Composite Particles for Lithium–Sulfur Battery Cathodes

Evaluation of a High‐Intensive Mixing Process in a Ring Shear Mixer and Its Impact on the Properties of Composite Particles for Lithium–Sulfur Battery Cathodes

Designing Graphite‐Based Positive Electrodes and Their Properties in Dual‐Ion Batteries Using Particle Size‐Adjusted Active Materials

Evaluation of Processes for Mechanical Manufacturing of Composite Materials for Li‐Sulfur Batteries

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