1,743,658 research outputs found
Powering 10-Ah-level Li-S pouch cell via a smart “skin”
No full textDespite the significant advantages of lithium-sulfur (Li-S) batteries over conventional lithium-ion batteries (LIBs), the practical usefulness of current Ah-level Li-S pouch cells is unsatisfactory, mainly because of the limited electrochemical performance and potential fire risk issues. In a recent study published in Matter, Wei et al. incorporated an ion-selective “skin” into 10-Ah-level Li-S cells and achieved an energy density of 412.7 Wh kg−1 with a low electrolyte/S ratio of 2.6 and an excess Li of 1.43.No Full Tex
An Image Based 3D Modelling Framework for Li-S Batteries
No full textTraditionally, 1D volume-averaged continuum approaches are used to model Li-S battery performance at varying C-rates. For the first time, we present a working three-dimensional electrochemical model of a Li-S battery based on real electrode microstructure. In this study we evaluate the gaps between a volume-averaged 1D electrochemical model and a microstructurally resolved 3D image-based electrochemical model to accurately predict the effects of the localised heterogeneities present in Li-S cathodes on the battery performance at varying C-rates. The real microstructure of the commercial electrode was obtained using micro–X-ray computed tomography and used as a framework for an image-based 3D electrochemical model of the Li-S battery. The extent of heterogeneities present in the electrode architecture and the adequacy of using the representative elementary volume to capture the effect of complex electrode microstructure on the cell performance were analysed by mapping the 3D electrode microstructure. In this study, three-dimensional, microstructurally-resolved, image-based electrochemical models were developed on sub-volumes of the electrode to evaluate the effect of heterogeneous structure on the localised performance, which are further compared with the 1D model developed using the volume-averaged effective microstructural properties obtained from the X-ray CT image. Finally, the future modelling framework that would aid in optimising the S/C structure for improved and uniform cell performance is discussed
Regulating liquid and solid-state electrolytes for solid-phase conversion in Li–S batteries
No full textThe solid-phase conversion mechanism in lithium–sulfur (Li–S) batteries has emerged with many attractive advantages such as avoiding the parasitic “shuttle effect” of soluble polysulfides and allowing lean electrolyte operating conditions. Electrolyte regulation could be a vital strategy for taking full advantage of solid-phase conversion to realize high-energy Li–S batteries. This review aims to provide a comprehensive overview of the role of electrolyte regulation in promoting solid-phase conversion, thereby preparing high-energy Li–S batteries in liquid, quasi-solid-state, and solid-state media. The work introduces the significance and historical development roadmap of solid-phase conversion in Li–S batteries and explores a design strategy for functional electrolytes based on working mechanisms. Furthermore, it outlines the challenges and opportunities in developing modern Li–S batteries governed by solid-phase conversion. We aim to provide insights and design principles for regulating electrolytes to solve the challenges presented in Li–S batteries, and we hope to provide readers with guidelines for the development and utilization of high-energy Li–S batteries.No Full Tex
Li-S battery recycling
No full textLithium-ion batteries are not situable for electric vehicles with high millage, military power supplies and fixed power networks. Therefore, the Li-S batteries have been intensively investigated, due to the high capacity, low cost, widespread source, and nontoxicity. The development of Li-S batteries causes increasing need to find the methods for their recycling. Some of them are discussed in the paper. The recycling of Li-S cell relates to its anode, cathode, electrolyte, binder and separator. The Li-S battery should be fully charged before recycling. There are potential methods for recycling of lithium from anodes, especially by re-melting. It is also possible to recycle some materials from the cathodes, especially sulfur by re-melting and graphite by dry crushing, Eco-bat Technologies method or the method investigated by Xiang et al. There is no effective recycling methods for electrolytes, binders and separators. It is necessary to carry out further studies on them
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
in Li‐S Batteries
Full text linkSeveral critical issues, such as the shuttling effect and the sluggish reaction kinetics, exist in the design of high-performance lithium–sulfur (Li-S) batteries. Here, it is reported that nitrogen doping can simultaneously and significantly improve both the immobilization and catalyzation effects of Co9S8 nanoparticles in Li-S batteries. Combining the theoretical calculations with experimental investigations, it is revealed that nitrogen atoms can increase the binding energies between LiPSs and Co9S8, and as well as alleviate the sluggish kinetics of Li-S chemistry in the Li2S6 cathode. The same effects are also observed when adding N-Co9S8 nanoparticles into the commercial Li2S cathode (which has various intrinsic advantages, but unfortunately a high overpotential). A remarkable improvement in the battery performances in both cases is observed. The work brings heteroatom-doped Co9S8 to the attention of designing high-performance Li-S batteries. A fundamental understanding of the inhibition of LiPSs shuttle and the catalytic effect of Li2S in the newly developed system may encourage more effort along this interesting direction. © 2020 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinhei
Recent research trends in Li-S batteries
No full textLithium-sulfur (Li-S) batteries have recently attracted enormous attention in the energy-storage sector owing to their high theoretical capacities (1675 mA h g(-1)), high theoretical energy densities (2600 W h kg(-1)), and cost-effectiveness compared to the state-of-the-art Li-ion batteries. Despite these merits, the practical application of Li-S battery technology is hindered by certain severe drawbacks. Therefore, current challenges need to be diagnosed in order to find effective solutions to these Li-S battery-commercialization obstacles. To help direct future work, we not only summarize current research trends, but also highlight an effective solution for the practical applications of Li-S batteries. In this review, we thoroughly summarize current research work on three kinds of Li-S battery systems based on different cathode materials, namely sulfur (S-8), lithium sulfide, and sulfurized-polyacrylonitrile. In addition, we also provide insight into the current challenges associated with Li-metal anodes in Li-S batteries. We then summarize and discuss an effective solution to these issues, namely the use of Li-metal-free anodes or all-solid state electrolytes in Li-S full cell systems.This work was supported by the Global Frontier R&D Program (2013M3A6B1078875) of the Center for Hybrid Interface Materials (HIM) funded by the Ministry of Science and ICT, and supported by National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Science (NRF-2018R1A2B3008794)
Recent research trends in Li-S batteries
No full textLithium-sulfur (Li-S) batteries have recently attracted enormous attention in the energy-storage sector owing to their high theoretical capacities (1675 mA h g(-1)), high theoretical energy densities (2600 W h kg(-1)), and cost-effectiveness compared to the state-of-the-art Li-ion batteries. Despite these merits, the practical application of Li-S battery technology is hindered by certain severe drawbacks. Therefore, current challenges need to be diagnosed in order to find effective solutions to these Li-S battery-commercialization obstacles. To help direct future work, we not only summarize current research trends, but also highlight an effective solution for the practical applications of Li-S batteries. In this review, we thoroughly summarize current research work on three kinds of Li-S battery systems based on different cathode materials, namely sulfur (S-8), lithium sulfide, and sulfurized-polyacrylonitrile. In addition, we also provide insight into the current challenges associated with Li-metal anodes in Li-S batteries. We then summarize and discuss an effective solution to these issues, namely the use of Li-metal-free anodes or all-solid state electrolytes in Li-S full cell systems.This work was supported by the Global Frontier R&D Program (2013M3A6B1078875) of the Center for Hybrid Interface Materials (HIM) funded by the Ministry of Science and ICT, and supported by National Research Foundation of Korea (NRF) grant funded by the Korea government Ministry of Science (NRF-2018R1A2B3008794)
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