Intensive powder mixing for dry dispersing of carbon black and its relevance for lithium-ion battery cathodes

Bockholt, Henrike; Haselrieder, Wolfgang; Kwade, Arno

doi:10.1016/j.powtec.2016.04.011

Cited by 139 publications

(137 citation statements)

References 26 publications

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“…At faster discharge rates, i.e., 1 C up to 10 C, electrodes prepared by intensive processing show a lower specific discharge capacity than electrodes prepared by reference processing. Missing long-range electric contacts are responsible for this loss in capacity retention, which is in good agreement with works published by Bauer et al [32] and Bockholt et al [61].…”

Section: Process-structure-property Relation Y Pspsupporting

confidence: 92%

“…To establish functions, which mathematically explain the parameter dependencies in detail, a lot of variations have to be carried out. In a previous work [61], a process-structure function for an intensive dry mixing process in electrode production is presented. In the following, the results of the experiments carried out in this work exhibit how strongly the addition of different additives and the slurry processing impact the inner structure of the coating.…”

Section: Resultsmentioning

confidence: 99%

“…An intensive process, resulting in a strong carbon black desagglomeration and its attachment to the active material surfaces [32,61], is compared to a reference process, in which the different components are only homogeneously distributed. The electrodes were finally compressed to three different porosities (approximately 45%, 35% and 25%) via calendering at room temperature.…”

Section: Electrode Manufacturingmentioning

confidence: 99%

See 2 more Smart Citations

The interaction of consecutive process steps in the manufacturing of lithium-ion battery electrodes with regard to structural and electrochemical properties

Bockholt

Indrikova

Netz

et al. 2016

Journal of Power Sources

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155

140

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Section: Process-structure-property Relation Y Pspsupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Electrode Manufacturingmentioning

confidence: 99%

See 1 more Smart Citation

The interaction of consecutive process steps in the manufacturing of lithium-ion battery electrodes with regard to structural and electrochemical properties

Bockholt

Indrikova

Netz

et al. 2016

Journal of Power Sources

Self Cite

155

140

View full text Add to dashboard Cite

“…Particular attention is paid by many researchers on the dispersion of the conductive additives CB and graphite in the suspension and in the final electrode structure, especially on the cathode side . CB forms weak agglomerates, which consist of chemically bound aggregates.…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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.

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“…This includes the increase of the intrinsic conductivity of active material compounds by means of particle surface coating or particle doping techniques . Others focus on the influence of conductive networks within electrodes on the cell performance …”

Section: Introductionmentioning

confidence: 99%

Numerical optimization of the spatial conductivity distribution within cathode microstructures of lithium-ion batteries considering the cell performance

et al. 2017

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Summary A numerical approach targeting the optimization of the spatial conductivity distribution within a three‐dimensional electrode microstructure of lithium‐ion batteries is presented. Its methodology is based on a spatially resolved three‐dimensional electrochemical model of a lithium‐ion battery half cell on the particle scale. Although being independent of the underlying electrode microstructure, the method is exemplarily applied on a computer‐generated periodic electrode structure consisting of smooth spherical particles. In the first step, parameter variations are performed to investigate the influence of the electrical conductivity on the simulated half‐cell performance. The simulations show that the performance‐limiting effect of low electrical conductivity values can be attributed to a through‐plane directed inhomogeneity of the local intercalation flux density. Furthermore, it is shown that if a homogenous surface intercalation flux density is reached, a further increase of the spatially uniform conductivity would not result in better half‐cell performance. In the second step, the determined optimum spatially uniform conductivity value is taken as a basis for the spatial optimization approach. The resulting conductive structure within the electrode shows gradient‐like behavior directed perpendicular to the electrode surface, while highest conductivity values are to be expected in the region close to the current collector. Therefore, multiple layer coating is suggested as a suitable practical manufacturing approach. Due to the proposed two‐stage optimization approach, the resulting conductive structure reveals conductivity saving potential without altering the macroscopic cell performance.

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Intensive powder mixing for dry dispersing of carbon black and its relevance for lithium-ion battery cathodes

Cited by 139 publications

References 26 publications

The interaction of consecutive process steps in the manufacturing of lithium-ion battery electrodes with regard to structural and electrochemical properties

The interaction of consecutive process steps in the manufacturing of lithium-ion battery electrodes with regard to structural and electrochemical properties

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

Numerical optimization of the spatial conductivity distribution within cathode microstructures of lithium-ion batteries considering the cell performance

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