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Influences of mechanical and structural properties of carbon aerogels on specific capacity in lithium sulfur batteries

Kröner, Jessica and Schwan, Marina and Milow, Barbara (2024) Influences of mechanical and structural properties of carbon aerogels on specific capacity in lithium sulfur batteries. Batterieforum Deutschland, 2024-01-24 - 2024-01-26, Berlin, Deutschland.

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Ziel: The rapid development of wireless electronic devices, electric vehicles and grid storage has brought increasing demands for the energy storage systems with high energy density. Therefore, efficient energy storage systems with high performance are required. Besides others, lithium-sulfur battery is one of the most promising candidates due to its higher theoretical gravimetric energy density of 2600 Wh/kg. Moreover, the natural abundance and environmental friendliness of elemental sulfur and low cost are beneficial. Despite the advantages of the Li-S battery, some challenges still exist in sulfur-based cathode, which hinder its practical development. The limited amount of accessible sulfur, significant volume changes during electrochemical reaction and the high solubility of polysulfide intermediates in electrolyte lead to poor capacity and short life time. To address these challenges novel aerogel-based cathode materials were developed. [1,2] Methodik: In this work, we synthesized and investigated highly microporous carbon aerogels with different degree of flexibility and particle sizes [3] to study their influences on the capacity in lithium-sulfur batteries. We have performed physisorption, electrical conductivity, SEM, and TEM measurements to investigate the microstructure, and compression test in order to study the mechanical properties. TGA measurements were used to evaluate the sulfur loading. The specific capacity was measured in DOL/DME with 0.1 C. Ergebnisse: The results show, that: • Micropores can encapsulate sulfur and thus reduce the polysulfide shuttle effect • High micropore volume and high electrical conductivity are not the only decisive factors for high performance • Due to long diffusion paths in large particles, the utilization of sulfur is limited • Large primary particles show channels as a result of activation, promoting the shuttle effect • High flexibility is required to compensate volume changes during cycling and to avoid cracks in the electrode Diskussion The conversion reaction of sulfur and the formation of Li2S cause a large volume expansion, which results in a reduction of electron transport paths and thus a decrease in kinetics. Flexible carbon aerogels with tailored microstructure can accommodate volume expansion due to their ability for reversible deformation up to a certain degree during cycling. The investigations show that the combination of mechanical and structural properties play a key role in the performance of lithium-sulfur batteries [1] B. Milow, M. Schwan, N. Wagner and F. Warth (2018). Elastisch verformbare Kohlenstoffaerogele als Matrixmaterial in Schwefelelektroden. DLR. Germany. DE 102018123285.3. [2] Nojabaee, M., et al., Ultramicroporous carbon aerogels encapsulating sulfur as the cathode for lithium–sulfur batteries. Journal of Materials Chemistry A, 2021. 9: p. 6508-6519 [3] Schwan, M., et al., The effect of pulverization methods on the microstructure of stiff, ductile, and flexible carbon aerogels. Journal of Materials Science, 2020. 55: p. 5861-5879

Item URL in elib:https://elib.dlr.de/202859/
Document Type:Conference or Workshop Item (Poster)
Title:Influences of mechanical and structural properties of carbon aerogels on specific capacity in lithium sulfur batteries
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Milow, BarbaraUNSPECIFIEDhttps://orcid.org/0000-0002-6350-7728UNSPECIFIED
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Carbon aerogels, lithium sulfur battery
Event Title:Batterieforum Deutschland
Event Location:Berlin, Deutschland
Event Type:national Conference
Event Start Date:24 January 2024
Event End Date:26 January 2024
Organizer:Kompetenznetzwerk Lithium-Ionen-Batterien
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Electrochemical Energy Storage
DLR - Research area:Energy
DLR - Program:E VS - Combustion Systems
DLR - Research theme (Project):E - Materials for Electrochemical Energy Storage
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Aerogels and Aerogel Composites
Deposited By: Kröner, Jessica
Deposited On:22 Feb 2024 09:22
Last Modified:24 Apr 2024 21:03

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