1,721,095 research outputs found
IL PARCO MARINO DI OROSEI
No full textL’articolo illustra le metodologie utilizzate per redigere la “geografia ambientale” del Parco del Golfo di Orosei (NU), propedeutica alla formulazione delle proposte di Piano
Electrochemistry and Basic Reaction Mechanism of Lithium Metal/Sulfur Batteries
No full textThe Li-sulfur (S) battery is a promising electrochemical system as a high-energy rechargeable battery due to its low cost and high theoretical specific energy. This chapter focuses on mechanism understanding of elemental sulfur conversion into Li2S through the polysulfides formation. The shuttle effect of Li2S4, Li2S6 and Li2S8 species is the main responsible of low Coulombic Efficiency. During charge metallic lithium is consumed followed by the formation of insulating Li2S layer on its surface. This chapter aims to summarize the most recent works reported in literature to understand the origin of this detrimental reaction
“Dead Lithium” Formation and Mitigation Strategies in Anode-Free Li-Metal Batteries
Full text linkThin lithium-metal foil is a promising anode material for next-generation batteries due to its high theoretical specific capacity and low negative potential. However, safety issues linked to dendrite growth, low-capacity retention, and short cycle life pose significant challenges. Also, it has excess energy that must be minimized in order to reduce the battery costs. To limit excess lithium, practical lithium metal batteries need a negative-to-positive electrode ratio as close to 1 : 1 as possible, which can be achieved through limiting excess lithium or using an “anode-free” metal battery design. However, both designs experience fast capacity fade due to the irreversible loss of active lithium in the cell, caused by the formation of the solid electrolyte interphase (SEI), dendrite formation and “dead lithium,” – refers to lithium that has lost its electronic connection to the anode electrode or current collector. The presence of dead lithium in batteries negatively affects their capacity and lifespan, while also raising internal resistance and generating heat. Additionally, dead lithium encourages the growth of lithium dendrites, which poses significant safety hazards. Within this fundamental review, we thoroughly address the phenomenon of dead lithium formation, assessing its origins, implications on battery performance, and possible strategies for mitigation. The transition towards environmentally friendly and high-performance metal batteries could be accelerated by effectively tackling the challenge posed by dead lithium
LE TECNOLOGIA E L'INFORMATICA PER LA RISORSA ACQUA
No full textIl testo riassume le problematiche connesse alla gestione frammentata delle risorse idriche, sottolineando i contributi alla efficienza ed al controllo delle reti che può comportare l'adozione di sistemi informatici di telecontrollo
STRADE CON I DOSSI, CASE SUGLI ALBERI, PONTI DALLE FINESTRE; IL DESIDERIO, IL DIRITTO E IL PIANO
No full textIl testo prende lo spunto dai disegni inviati da oltre 35.000 bambini al WWF nell’ambito della campagna “La riconquista della città”. I disegni, riguardanti i problemi e le aspirazioni del vivere in città, sono stati presi come spunto per misurare la distanza oggi esistente tra desiderio (di una diversa qualità di vita), diritto e piano, ovvero per evidenziare la latenza della pianificazione urbanistico-territoriale ed ambientale rispetto ai diritti del cittadino assicurati dalla normativa vigente
Hybrid electrolytes for lithium-ion batteries
No full textLithium-ion batteries (LIBs) are playing a central role in the transition to a postoil society. Solid-state electrolytes are considered a promising technology to achieve high energy density (500Wh/kg) by implementing Li metal as anode material, as well as to overcome the safety concerns related to the liquid electrolytes used in LIBs. In this chapter, the limitations of traditional polymer solid electrolytes and the recent advances in hybrid solid electrolytes (e.g., composite solid electrolytes) will be reported. Furthermore, the effects of the inorganic filler (e.g., concentration, particle size, morphology, etc.) on Li+ ions’ conduction mechanism will be elucidated. Finally, the advantages of the use of ionic liquids will also be introduced
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