Influence of dispersing by extrusion and calendering on the performance of lithium-ion battery electrodes

Dreger, Henning; Haselrieder, Wolfgang; Kwade, Arno

doi:10.1016/j.est.2018.11.028

Cited by 45 publications

(58 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To understand the outcome better, Figure shows the size distribution of the CB particles. In accordance with other authors, a bimodal distribution in a range of 10 µm to below 1 µm is apparent . The first peak in the range below 1 µm represents the CB aggregates, whereas the second peak between 1 and 10 µm portrays the CB agglomerates.…”

Section: Resultssupporting

confidence: 92%

“…Within the standard deviation, the highest initial discharge capacities and the lowest capacity fade are obtained by the electrodes produced from solid contents of 70 and 75 wt% and, therefore, for the highest amount of CB aggregates (Figure ). This confirms the results from the study by Dreger et al, who states an optimum CB mean diameter in the range of 1–1.5 µm . On the other hand, the lowest initial discharge capacity is observed for the lowest solid contents due to the insufficient distribution of the CB content and, hence, worse electron density distribution.…”

Section: Resultssupporting

confidence: 91%

“…Figure shows the geometric mean diameter of the CB structures in freshly prepared suspensions. The geometric mean diameter is more suitable for describing a broad size distribution than the widely used median ( d 50 ) . Within the particular test series, a minimal particle size is ascertainable.…”

Section: Resultsmentioning

confidence: 99%

“…In long‐term cycling at 1 C, the differences in discharge capacity between the different solid contents become larger. In the case of the electrode coated with 65 wt%, due to only a few, weak electrical pathways, leading to contact losses to the active material particles, a stronger capacity loss during long‐term cycling occurs compared with the electrode coated with 75 wt% solids content . In the electrode dispersed and coated with 80 wt% solid contents, the conductive graphite is damaged due to high shear forces.…”

Section: Resultsmentioning

confidence: 99%

“…Dreger et al developed a method for measuring the size distribution of CB in the suspension via a pretreatment and laser diffraction analysis. As a result, the influence of different mixing process parameters on the CB particles within the suspension and, later on, their influence on electrode properties as well as electrochemical performance could be assessed …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

2019

Self Cite

View full text Add to dashboard Cite

The influence of the solid content is investigated for cathodes with nickel cobalt manganese oxide (NCM) as an active material during the continuous dispersion in a twin‐screw extruder as well as during the coating and drying processes. Rheological and particle size distribution analyses are carried out to characterize the suspensions. Specifically, mechanical, structural, and electrochemical properties of the manufactured electrodes are determined. The presented results show that an increase in the solid content of the electrode suspension during the extrusion process results in a higher carbon black (CB) dispersion degree due to a higher energy input. At solid content above 80 wt%, delamination of conductive graphite and deposition of CB onto the active material occur. Furthermore, it is proved that within a range of 70–75 wt% solid content, the mechanical, conductive, and electrochemical performances can be enhanced.

show abstract

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

2019

Self Cite

View full text Add to dashboard Cite

show abstract

Transforming Materials into Practical Automotive Lithium‐Ion Batteries

Hou

Yang

Zhou³

et al. 2021

Adv Materials Technologies

View full text Add to dashboard Cite

Although tremendous efforts have been devoted into research and development of materials science and engineering, chemistry, electrochemistry, and solid‐state physics in lithium‐ion batteries (LIBs) over the last 30 years, the critical technologies and applied science underneath manufacturing and processing seem very seldom reported, which is further manifested by the realization of the gap between academy and industry within recent years. In this paper, the intrinsic relationship of materials‐processing‐performance is highlighted by thoroughly reviewing the bridge effect of processing, transport, and transfer at different scales across electrode, heterogeneous thermodynamics, and kinetics during charge‐discharge cycles, the tradeoff between areal capacity and rate performance, and some practical novel electrode designs. Based on very limited open literature, the fundamental basics and sciences of the state of art production steps including slurry mixing, coating, drying, calendering, electrolyte filling, and formatting are comprehensively discussed. Through correlating with the materials design and development, the electrode compositions and structures, and the bridge effect of processing, the in‐depth understanding of the importance of individual steps and their interactions are provided to shed light on further improvement on materials and manufacturing for LIBs.

show abstract

Insights into Influencing Electrode Calendering on the Battery Performance

Abdollahifar

Cavers

Scheffler

et al. 2023

Advanced Energy Materials

Self Cite

View full text Add to dashboard Cite

As the demand for lithium‐ion batteries (LIBs) continuously grows, the necessity to improve their efficiency/performance also grows. For this reason, optimization of the individual production steps is critical. Calendering is a crucial production step whereby electrode coatings are compacted to targeted densities. This process affects the porosity, adhesion, thickness, wettability, and charge transport properties of the electrodes, as well as the homogeneity of the coatings. Optimal calendered electrodes improve volumetric energy density, cyclic stability, and rate capability of the cells and also enhance the structural stability of the active material, which affects electrode safety and polarization. This article outlines the fundamental processes and mechanisms, as well as how modeling, simulation, and tomography can be used to optimize these processes. Additionally, the influence of calendering on a wide range of anode and cathode active materials is discussed. This review serves to give a deeper understanding into the calendering process‐structure‐performance relationships, and how they can be optimized to improve the performance of LIBs.

show abstract

Influence of dispersing by extrusion and calendering on the performance of lithium-ion battery electrodes

Cited by 45 publications

References 38 publications

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

Extrusion‐Based Processing of Cathodes: Influence of Solid Content on Suspension and Electrode Properties

Transforming Materials into Practical Automotive Lithium‐Ion Batteries

Insights into Influencing Electrode Calendering on the Battery Performance

Contact Info

Product

Resources

About