Das metallurgische und elektrische Verhalten von Koks, insbesondere von Erzkoks, unter den realen Bedingungen des elektrischen Niederschachtofens

Schenck, Hermann; Wenzel, Werner; Rajasekhar, B. R.; Block, Franz-Rudolf

doi:10.1007/978-3-663-06926-3

Cited by 1 publication

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“…For the measurements displayed, specific resistance decreases with increasing particle size; for the electrode KS15‐X4, a resistivity of 43.4 Ωcm and for KS 15–X10, a resistivity of 21.2 Ωcm is measured. As the conductivity of graphite is very high (= 1 − 1·10 5 S cm −1 (parallel to the graphene planes in a single crystal), the specific resistance of the electrodes results from contact resistances between the particles . An electrode can be assumed as a resistant network and the number of contacts, and, thus, contact resistances determine the electric conductivity of the investigated composite electrodes .…”

Section: Resultsmentioning

confidence: 99%

“…As the conductivity of graphite is very high (¼ 1 À 1·10 5 S cm À1 (parallel to the graphene planes in a single crystal) [19] , the specific resistance of the electrodes results from contact resistances between the particles. [20] An electrode can be assumed as a resistant network and the number of contacts, and, thus, contact resistances determine the electric conductivity of the investigated composite electrodes. [21] The number of active material particles in the electrode coating decreases with increasing particle size and, thus, decreasing number of contacts.…”

Section: Physical Propertiesmentioning

confidence: 99%

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Designing Graphite‐Based Positive Electrodes and Their Properties in Dual‐Ion Batteries Using Particle Size‐Adjusted Active Materials

et al. 2019

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In almost all state‐of‐the‐art lithium‐ion batteries, the negative electrode is made from graphite. For dual‐ion batteries (DIBs), graphite electrodes can even be used as negative and positive electrodes as the electrolyte provides both cations and anions for energy storage. As the amount of active material is very high in graphite electrodes, one of the main structure‐controlling parameters is its particle size distribution (PSD). Based on changes in the active material particle size and resulting changes in electrode structure, the corresponding cell characteristics like coulombic efficiency or power density are strongly affected. Herein, results for graphite positive electrodes manufactured with different PSDs of one typical commercial synthetic graphite are displayed. A high‐performance single‐wheel air classifier is used to create the differently distributed graphite particle fractions that do not vary in particle shapes for all fractions created. To gain a better understanding of the particle size impact on electrode properties, the electronic and mechanical properties, as well as the electrode structure, are investigated. The electrochemical performance of the Li metal/graphite system is correlated with structure properties influenced by PSD.

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Section: Resultsmentioning

confidence: 99%

Section: Physical Propertiesmentioning

confidence: 99%