Sulfur Cathodes

Althues, Holger; Dörfler, Susanne; Thieme, Sören; Strubel, Patrick; Kaskel, Stefan

doi:10.1002/9781119297895.ch2

Cited by 3 publications

(2 citation statements)

References 126 publications

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“…[5][6][7][8] To address these challenges, highly porous carbon (C) materials are commonly employed in composite cathodes for Li-S batteries influencing not only the conductivity of the cathode, but also the diffusion and charge transport processes as well as PS retention. [9][10][11][12] The composition and structure of this class of cathode are crucial to the electrochemical performance, the achieved energy density and the stability of the cell. 13 Specifically, the volume and size distribution of the pores in the C host were demonstrated to be crucial to the capacity retention.…”

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confidence: 99%

Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC

Gerle

Wagner

Häcker

et al. 2022

J. Electrochem. Soc.

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For lithium-sulfur batteries, porous carbon/sulfur composite cathodes are the primary solution to compensate the non-conductive nature of sulfur. The composition and structure of this class of cathodes are crucial to the electrochemical performance, achieved energy density and the stability of the cell. Electrochemical impedance spectroscopy is employed to investigate and correlate the electrochemical performance of lithium-sulfur batteries to the composition and microstructure of differently fabricated carbon/sulfur composite cathodes. A transmission line model is applied to identify different underlying electrochemical processes appearing in the impedance response of a range of porous carbon/sulfur cathodes. The integration of a lithium ring serving as a counter electrode coupled with advanced wiring has allowed an artifact-free recording of the cathode impedance at different states of charge with the aim to investigate the evolution of impedance during discharge/charge and the kinetics of charge transfer depending on the infiltration method and the utilized carbon host. It is shown that impedance response of this class of cathodes is highly diverse and the plausible underlying processes are discussed in details. To this end, quasi-solid-state and various polysulfide-based charge transfer mechanisms are identified and their time constants are reported.

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confidence: 99%

Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC

Gerle

Wagner

Häcker

et al. 2022

J. Electrochem. Soc.

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“…However, the high weight density of the metallic materials affects the total energy density of the Li-S battery by reducing the sulfur content in the cathode [21]. Recently, organosulfur compounds have been introduced in Li-S batteries to overcome these obstacles [22][23][24][25][26][27][28]. In organosulfur, the combination of sulfur and polymer matrix is at the molecular level, enhancing the theoretical e ciency [29].…”

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confidence: 99%

Reaction mechanism of methyl trifluoroacetate (CH3TFA) with lithium polysulfides (Li2S6) in gas and solvent phase

Cheviri,

Lakshmipathi

2023

Theor Chem Acc

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In this DFT study, we have evaluated the reaction mechanism of lithium polysul de (Li 2 S 6 ) with the electrolyte additive methyl tri uoroacetate (CH 3 TFA) in the gas and solvent (dimethoxyethane (DME)) phase at room temperature (298 K) by locating transition states (TS) for the methyl group transfer from CH 3 TFA to Li 2 S 6 , which is reported to produces organosulfur ((CH 3 ) 2 S 6 ). All the reported methyl transfer reactions that lead to the formation of organosulfur are having high barrier energy. The barrier energy difference between gas and solvent phase is maximum of 7 kcal/mol and both the reactions are in extreamely slow regime. therefore, the methyl transfer reaction for the formation of organosulfur implausible at room temperature.

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A first-principles study on chemical adsorption of lithium polysulfide molecules: investigating the influence of carbon, boron, and nitrogen vacancies in boron carbon nitride 2D sheets

Cheviri

Lakshmipathi

2023

Appl. Phys. A

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Sulfur Cathodes

Cited by 3 publications

References 126 publications

Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC

Identification of the Underlying Processes in Impedance Response of Sulfur/Carbon Composite Cathodes at Different SOC

Reaction mechanism of methyl trifluoroacetate (CH3TFA) with lithium polysulfides (Li2S6) in gas and solvent phase

A first-principles study on chemical adsorption of lithium polysulfide molecules: investigating the influence of carbon, boron, and nitrogen vacancies in boron carbon nitride 2D sheets

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