Analyzing Bending Stresses on Lithium‐Ion Battery Cathodes induced by the Assembly Process

Schilling, Antje; Schmitt, Jan; Dietrich, Franz; Dröder, Klaus

doi:10.1002/ente.201600131

Cited by 39 publications

(33 citation statements)

References 23 publications

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“…Studies on the effects of calendering graphite anodes and their processabilities have shown that calendering improves the wetting rate of the anodes due to particle realignment and an increase in divergence within the pore networks, whereas calendering beyond an optimum level reduces wetting rates due to reduction in porosity and average pore diameter . In addition, it was shown that calendering increases the breaking stress of the laminate, simultaneously increasing its brittleness . In another study, it was shown that the calendering of lithium nickel manganese cobalt oxide cathode (NMC) affects their structure by reducing the pore size and eventually cracks the active material particles …”

Section: Introductionmentioning

confidence: 99%

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

et al. 2019

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The production of lithium‐ion cells consists of a series of highly interlinked process steps. Calendering, as the last step of electrode manufacturing, has a significant impact on electrode characteristics. The process primarily aims at enhancing the electrode energy density and hereinafter, minimizing the plastic deformability, improving the conductivity, and determining the pore structure of the electrode. So far, electrode characteristics are mainly investigated regarding the impact on cell quality. However, they also affect their subsequent processabilities in the process chain, which is crucial for cost improvement, for example, by reduction of scrap rates. Herein, a methodical identification, description, and categorization of electrode characteristics is conducted based on a literature review, an expert survey, and operating experience. The methodical classification will provide a basis for the modeling of the interaction between the influencing factors (product properties, process parameters, and machine characteristics) and electrode characteristics during calendering.

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Section: Introductionmentioning

confidence: 99%

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

et al. 2019

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“…Moreover, it could reduce the cohesive strength and ionic conductance. [ 125,126 ] The achieved coating density and porosity of the electrode after calendering was revealed an exponential correlation with the applied line load, and a mathematical description was developed to qualify the converging course to a density maximum or porosity minimum. [ 127 ] The characteristic parameter, compaction resistance, represents the compaction resistance of the electrode coating, which is identified to be highly dependent on the used materials and formulations and the pore structures developed in the coating, but less dependent on the roller speed.…”

Section: Transforming Materials Into Practicalmentioning

confidence: 99%

Transforming Materials into Practical Automotive Lithium‐Ion Batteries

Hou

Yang

Zhou³

et al. 2021

Adv Materials Technologies

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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.

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“…On the one hand, clean energy is widely used, and traditional energy conversion storage equipment has been unable to satisfy various demands . On the other hand, the widespread use of portable electronic devices, electric vehicles, and the Internet of things leads to people need higher requirements for energy storage devices . Lithium‐ion batteries(LIB) have been widely studied due to their light weight, high energy, and safety .…”

Section: Introductionmentioning

confidence: 99%

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

Hou

Yang

2020

ChemNanoMat

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Silicon has an extremely high theoretical capacity, a low voltage platform, and abundant natural reserves. It is considered to be one of the most promising anode materials for lithium-ion batteries. However, there are still many problems with silicon as an anode material for lithium-ion batteries. During the lithiation/delithiation of silicon, a huge volume expansion occurs, causing the silicon particles to pulverize and the capacity to drop sharply. Furthermore, the continuous increase in the silicon surface solid electrolyte interphase (SEI) films and the poor conductivity of silicon affect the specific capacity of the battery. Means to improve silicon-based anodes with regard to electrode cycling performance and electrode capacity include structural design, composite preparation, or improvements in electrolytes and binders (for example, designing silicon nanomaterials of different dimensions from 0D to 3D, including silicon nanoparticles, nanowires, nanorods, thin films, porous silicon, and core-shell structures). Silicon has been combined with different materials to buffer its own volume expansion, resulting in excellent performance. In addition, the design of a reasonable electrolyte solution, as well as the development of a selfhealing binder is one of the main methods to improve Sibased anodes. In recent years, sodium/potassium ion batteries have been increasingly studied, and silicon and sodium/potassium can be alloyed. The corresponding theoretical capacity can reach 954 mAh g À 1 and 955 mAh g À 1 , respectively. Advances in silicon-based anodes for sodium/ potassium ion storage are summarized herein.ductility. [25] It can increase the conductivity of silicon and adapt to the large volume expansion of silicon. In addition, some are compounded with silicon or metal or metal oxides. Such as copper, silver, tin oxide and titanium oxide. [39][40][41][42][43][44] In addition to changing the silicon's own morphological structure and preparing composite materials, the design and selection of electrolytes and binders is to improve the performance of silicon-based electrodes from the outside. By selecting the appropriate electrolytes, the electrode materials can be effectively reduced deterioration. At present, various additive-modified organic solvent electrolytes, ionic liquid electrolytes, and all-solid electrolytes are widely used in silicon-based anodes. [45][46][47][48] In addition, it is widely applicable to the binder polyvinylidene fluoride(PVDF) of lithium ion battery electrode materials, but

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Analyzing Bending Stresses on Lithium‐Ion Battery Cathodes induced by the Assembly Process

Cited by 39 publications

References 23 publications

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

Classification of Calendering‐Induced Electrode Defects and Their Influence on Subsequent Processes of Lithium‐Ion Battery Production

Transforming Materials into Practical Automotive Lithium‐Ion Batteries

Silicon Anodes for High‐Performance Storage Devices: Structural Design, Material Compounding, Advances in Electrolytes and Binders

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