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

Haarmann, Matthias; Haselrieder, Wolfgang; Kwade, Arno

doi:10.1002/ente.201801169

Cited by 42 publications

(55 citation statements)

References 37 publications

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“…Another reason for an increasable capacity especially at higher C‐rates is the low content of carbon black (1.5 wt%) and graphite (0.75 wt%) in the cathode. In literature, higher amounts of conductive additives are used to reach higher discharge capacities, however, this was not the aim of the present study as the chosen electrode compositions were industry‐oriented [1,29,44] . Another reason for the increasable discharge capacities during cycling can be found in the preceding C‐rate test which was conducted up to 5 C even with these thick electrodes to generate clear differences between both post‐drying procedures.…”

Section: Results and Discusionmentioning

confidence: 99%

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Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Huttner

Marth

Eser

et al. 2021

Batteries & Supercaps

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In order to reduce the residual moisture in lithium‐ion batteries, electrodes and separators need to be post‐dried prior to cell assembly. On an industrial scale, this is often conducted batch‐wise in vacuum ovens for larger electrode and separator coils. Especially for electrodes, the corresponding post‐drying parameters have to be carefully chosen to sufficiently reduce the moisture without damaging the sensitive microstructure. This requires a fundamental understanding of structural limitations as well as heat transfer and water mass transport in coils. The aim of this study is to establish a general understanding of the vacuum post‐drying process of coils. Moreover, the targeted design of efficient, well‐adjusted and application‐oriented vacuum post‐drying procedures for electrode coils on the basis of modelling is employed, while keeping the post‐drying intensity as low as possible, in order to maintain the sensitive microstructure and to save time and costs. In this way, a comparatively short and moderate 2‐phase vacuum post‐drying procedure is successfully designed and practically applied. The results show that the designed procedure is able to significantly reduce the residual moisture of anode and cathode coils, even with greater electrode lengths and coating widths, without deteriorating the sensitive microstructure of the electrodes.

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Section: Results and Discusionmentioning

confidence: 99%

“…post‐dried graphite anodes with PVDF overnight at 80 °C under vacuum. Haarmann et al [29] . chose 16 hours and 120 °C in vacuum for graphite anodes and NCM622 cathodes with PVDF binder.…”

Section: Introductionmentioning

confidence: 99%

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Huttner

Marth

Eser

et al. 2021

Batteries & Supercaps

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“…adopted the extrusion method to provide extra pressure to deposit the high-viscosity slurry on the current collector ( Schünemann et al., 2016 ). Although this method cannot fully avoid the organic solvent, the increase of the solid content from 55% to 75% can increase the drying speed up to 80% and further improve the throughput ( Haarmann et al., 2019 ).…”

Section: Current Manufacturing Processes For Libsmentioning

confidence: 99%

Current and future lithium-ion battery manufacturing

et al. 2021

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Summary Lithium-ion batteries (LIBs) have become one of the main energy storage solutions in modern society. The application fields and market share of LIBs have increased rapidly and continue to show a steady rising trend. The research on LIB materials has scored tremendous achievements. Many innovative materials have been adopted and commercialized by the industry. However, the research on LIB manufacturing falls behind. Many battery researchers may not know exactly how LIBs are being manufactured and how different steps impact the cost, energy consumption, and throughput, which prevents innovations in battery manufacturing. Here in this perspective paper, we introduce state-of-the-art manufacturing technology and analyze the cost, throughput, and energy consumption based on the production processes. We then review the research progress focusing on the high-cost, energy, and time-demand steps of LIB manufacturing. Finally, we share our views of challenges in LIB manufacturing and propose future development directions for manufacturing research in LIBs.

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“…Another relevant mechanical property is the ratio W el / W pl , which is related to the contact strength between the polymer (PVdF) and the solid particles (NMC, CB)/current collector and allows to infer in the electrode adhesion [26] . The changes in W el / W pl as a function of the calendering parameters, displayed in Figure 2B, do not show any apparent trend.…”

Section: Resultsmentioning

confidence: 99%

Calendering of Li(Ni_0.33Mn_0.33Co_0.33)O₂‐Based Cathodes: Analyzing the Link Between Process Parameters and Electrode Properties by Advanced Statistics

Primo

Touzin

Franco

2021

Batteries & Supercaps

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The optimization of the calendering process represents one of the key tasks for tuning the lithium‐ion battery performance. In this study, we present a systematic statistical‐based study of the three main calendering parameters (namely, the applied pressure, roll temperature, and line speed) effect on the porosity, electrode mechanical properties and electronic conductivity. Our work main goal is to understand how by changing the calendering parameters, the electrode properties can be tuned and up to which degree they determine the electrode capacity of Li(Ni0.33Mn0.33Co0.33)O2‐based cathodes. The statistical tools used for the analysis were the analysis of the covariance (ANCOVA), the principal components analysis (PCA), and the unsupervised machine learning k‐means clustering algorithm. Our results showed that while porosity and the mechanical properties depend mainly on the applied pressure, the electrode's conductivity correlates mainly with the temperature. All of them were found to influence the cathode's capacity (at a rate equal to C), being the best condition applied pressures between 60 and 120 MPa and roll temperatures between 60 and 75 °C.

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

Cited by 42 publications

References 37 publications

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Current and future lithium-ion battery manufacturing

Calendering of Li(Ni_0.33Mn_0.33Co_0.33)O₂‐Based Cathodes: Analyzing the Link Between Process Parameters and Electrode Properties by Advanced Statistics

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

Cited by 42 publications

References 37 publications

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Design of Vacuum Post‐Drying Procedures for Electrodes of Lithium‐Ion Batteries

Current and future lithium-ion battery manufacturing

Calendering of Li(Ni0.33Mn0.33Co0.33)O2‐Based Cathodes: Analyzing the Link Between Process Parameters and Electrode Properties by Advanced Statistics

Contact Info

Product

Resources

About

Calendering of Li(Ni_0.33Mn_0.33Co_0.33)O₂‐Based Cathodes: Analyzing the Link Between Process Parameters and Electrode Properties by Advanced Statistics