1,720,960 research outputs found
Hybrid Ionogels and Self-Healing Electrolytes: Innovative Solutions for Safer Lithium Metal Batteries
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Soft Batteries: Electrochemical Innovations for Sustainable Energy Storage
No full textResearch into soft energy storage materials is progressing rapidly with several applications in
healthcare and soft robotics. This chapter presents novel materials used across battery
components in next-generation designs, covering innovations in electrodes, electrolytes, and
separators, in addition with possible structural designs. It includes a collection of fundamentals
about Li-ion chemistry to clarify essential material selection criteria, alongside recent
developments in soft batteries utilizing alternative chemistries
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
Production scraps to raw materials: low-cost method for implementing lithium iron phosphate cathode scraps back to production lines
No full textIn recent years, the increased production of lithium-ion batteries (LIBs) has been causing significant amounts of production scraps that require efficient, economical, and environmentally viable recycling methods. This study investigates strategies for integrating low-temperature direct recycling of lithium iron phosphate (LFP) production scraps into battery manufacturing. Scrap LFP cathode active material (CAM) was direct recycled at 200 °C in air and 400 °C in N2. The recycled CAM was blended in different amounts (100, 50, 30%-wt) with commercial CAM. Two slurry compositions were considered based on CAM: polyvinylidene fluoride: carbon black ratios (80:10:10 and 92:5:3), and coin cells were manufactured and tested. Results indicate that recycled CAM can be directly reprocessed in new batteries exhibiting excellent electrochemical performance (154 mAh g−1, equivalent to pristine material) when the slurry included 30%-wt CAM recycled at 200 °C in air and 100%-wt CAM recycled at 400 °C in N2. Compared to virgin slurry material cost (9.06 €/kgslurry) and environmental impact (8.27 kg CO2/kgslurry), incorporating 30%-wt CAM recycled at 200 °C in air reduced costs to 6.59 €/kgSlurry and emissions to 6.21 kgCO2/kgslurry, and 100%-wt CAM recycled at 400 °C in N2 corresponded to 3.77 €/kgSlurry and 2.45 kgCO2/kgslurry. These findings clearly demonstrate that closed-loop integration of low-temperature direct recycling of LFP cathode scraps into cell manufacturing reduces material costs and environmental impact while maintaining high electrochemical performance
Crosslinked ionogels containing a Li-conducting inorganic phase as electrolyte for lithium-metal batteries
No full textIn the quest for the development of safer lithium-metal batteries (LMBs), the integration of inorganic fillers and ionic liquids into polymer matrices has emerged as a promising strategy to enhance safety, ionic conductivity and battery performance. This study introduces a novel composite ionogel (IG) synthesized through a facile one-pot method, incorporating butyl methacrylate (BMA) and poly(ethylene glycol) diacrylate (PEGDA) with the ionic liquid 1-butyl-1-methylpyrrolidinium bis(fluorosulfonyl)imide (PYR14FSI) and garnet Li6.4La3Zr1.4Ta0.6O12 (LLZTO) nanoparticles. A distinctive feature of the approach is the use of an organosilane functionalization of the LLZTO nanoparticles, which ensures their full integration into the polymer matrix during free-radical polymerization. Moreover, this method effectively eliminates the Li2CO3 passivation layer that typically forms on the surface of the LLZTO nanoparticles, thus, further contributing to an enhanced performance. As a result, a LMB with the functionalized LLZTO IG electrolyte delivered more than 160 mA h g−1 with a very good capacity retention of 97.7% after 400 cycles in Li|IG|LFP cells
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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