Capillary suspensions as beneficial formulation concept for high energy density Li-ion battery electrodes

Bitsch, Boris; Gallasch, Tobias; Schroeder, Melanie; Börner, Markus; Winter, Martin; Willenbacher, Norbert

doi:10.1016/j.jpowsour.2016.07.102

Cited by 38 publications

(24 citation statements)

References 46 publications

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“…Here, we investigated the effect of the electrode preparation method on the electrochemical performance of the Li/S 8 cells using different mixing methods. High mixing speeds of up to 1200 rpm are used in the fabrication of commercial electrodes . On a lab scale, the speed used varies from a few hundreds of rpm (magnetic stirrer, ball milling) to several tens of thousands (UltraTurrax).…”

Section: Resultsmentioning

confidence: 99%

A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

Gröbmeyer¹,

Becking

Bieker

et al. 2019

Energy Tech

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Lithium–sulfur batteries are still characterized by the low intrinsic electronic conductivity of sulfur in both its charged state (S8) as well as discharged state (Li2S). Here, using ball milling, a well‐dispersed active material within the carbon network is achieved using carbon black Super C65 and synthetic graphite KS6 as conductive agents. Calendering these electrodes increases the electronic percolation path resulting in enhanced electrochemical performances and reaction kinetics. Using high‐speed and high‐impact preparation methods improves the quality and performances of the S8/C composite electrodes when compared with electrodes prepared using a simple mixing method (magnetic stirring). The scanning electron microscopy images indicate that KS6 is able to incase S8 particles, resulting in a homogeneous distribution of the active material that in turn enhances the accessibility of the active material by the electrolyte and electrons. Compared with the S8/Super C65 composite electrode, a discharge capacity of 703 mAh g−1 is delivered by the S8/KS6 composite electrode during the first cycle. After 30 cycles, the S8/KS6 composite electrode delivers 477 mAh g−1 compared to only 411 mAh g−1 for the S8/Super C65 composite electrode due to a continuous capacity fading.

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Section: Resultsmentioning

confidence: 99%

A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

Gröbmeyer¹,

Becking

Bieker

et al. 2019

Energy Tech

Self Cite

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“…This effect can be used as a simple method to tune the flow behavior of suspensions that would otherwise require the addition of binding agents, surfactants or other additives 9. Capillary suspensions can be used for various applications such as precursors for ceramic or glass filters with high porosity and simultaneously small pore size,10, 11, 12 improved polymer blends,5, 13, 14 slurries for printable electronics with accurately molded edge shape, good charge transfer properties and reduced resistivity 15, 16, 17,. thermal interface materials,18 slurries of renewable carbon sources used for generation of energy19 or the preparation of novel food products 20…”

Section: Introductionmentioning

confidence: 99%

Influence of mixing conditions on the rheological properties and structure of capillary suspensions

Bossler

Weyrauch

Schmidt

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The rheological properties of a suspension can be dramatically altered by adding a small amount of a secondary fluid that is immiscible with the bulk liquid. These capillary suspensions exist either in the pendular state where the secondary fluid preferentially wets the particles or the capillary state where the bulk fluid is preferentially wetting. The yield stress, as well as storage and loss moduli, depends on the size and distribution of secondary phase droplets created during sample preparation. Enhanced droplet breakup leads to stronger sample structures. In capillary state systems, this can be achieved by increasing the mixing speed and time of turbulent mixing using a dissolver stirrer. In the pendular state, increased mixing speed also leads to better droplet breakup, but spherical agglomeration is favored at longer times decreasing the yield stress. Additional mixing with a ball mill is shown to be beneficial to sample strength. The influence of viscosity variance between the bulk and second fluid on the droplet breakup is excluded by performing experiments with viscosity-matched fluids. These experiments show that the capillary state competes with the formation of Pickering emulsion droplets and is often more difficult to achieve than the pendular state.

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“…Also, 3D micro-structured electrodes that demonstrate shorter diffusion lengths and reduced ohmic resistance are sometimes utilized for achieving higher power density and energy capacity. However, fabrication of 3D microstructures besides being expensive, also involves many complex processing steps whereas simple manufacturing methods with a minimum number of fabrication steps are generally preferred for commercialization [67].…”

Section: Ease Of Manufacturingmentioning

confidence: 99%

Application of Robust Design Methodology to Battery Packs for Electric Vehicles: Identification of Critical Technical Requirements for Modular Architecture

2018

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Modularity-in-design of battery packs for electric vehicles (EVs) is crucial to offset their high manufacturing cost. However, inconsistencies in performance of EV battery packs can be introduced by various sources. Sources of variation affect their robustness. In this paper, parameter diagram, a value-based conceptual analysis approach, is applied to analyze these variations. Their interaction with customer requirements, i.e., ideal system output, are examined and critical engineering features for designing modular battery packs for EV applications are determined. Consequently, sources of variability, which have a detrimental effect on mass-producibility of EV battery packs, are identified and differentiated from the set of control factors. Theoretically, appropriate control level settings can minimize sensitivity of EV battery packs to the sources of variability. In view of this, strength of the relationship between ideal system response and various control factors is studied using a "house of quality" diagram. It is found that battery thermal management system and packaging architecture are the two most influential parameters having the largest effect on reliability of EV battery packs. More importantly, it is noted that heat transfer between adjacent battery modules cannot be eliminated. For successful implementation of modular architecture, it is, therefore, essential that mechanical modularity must be enabled via thermal modularity of EV battery packs.Keywords: P-diagram; house of quality; lightweight and compact battery packaging; ease of manufacturing/assembly; vehicle impact and crashworthiness; thermal reliability

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Capillary suspensions as beneficial formulation concept for high energy density Li-ion battery electrodes

Cited by 38 publications

References 46 publications

A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

Influence of mixing conditions on the rheological properties and structure of capillary suspensions

Application of Robust Design Methodology to Battery Packs for Electric Vehicles: Identification of Critical Technical Requirements for Modular Architecture

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Capillary suspensions as beneficial formulation concept for high energy density Li-ion battery electrodes

Cited by 38 publications

References 46 publications

A Facile Preparation of S8/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

A Facile Preparation of S8/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

Influence of mixing conditions on the rheological properties and structure of capillary suspensions

Application of Robust Design Methodology to Battery Packs for Electric Vehicles: Identification of Critical Technical Requirements for Modular Architecture

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Product

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A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance

A Facile Preparation of S₈/C Composite Cathode for Lithium‐Sulfur Cells: Influence of Intrinsic and Extrinsic Cathode Properties on the Electrochemical Performance