1,721,084 research outputs found
Synthesis and Characterization of Mixed Vanadium Oxide Cathode Materials for Lithium-Ion Batteries
No full textDevelopment of new generation lithium-ion batteries within the NEXTCELL project
No full textThe growing demands for cost-effectiveness, electric vehicle user-friendliness, and safety are driving the need for innovative advancements in Li-ion battery (LIB) material and cell design. The NEXTCELL project aims to address these challenges by introducing a new generation of LIB cells capable of high capacity and high voltage applications through the development and validation of a novel jellified cell concept. The project methodology focuses on prototyping, modeling, and evaluating technical, safety, sustainability, and cost enhancements.
The project involves collaboration among various partners specializing in different aspects related to battery production, characterization, and improvement. From industry leaders like FEV, SYENSQO, CRF (research center for the Fiat Chrysler Automobiles group), and ABEE (Avesta Battery & Energy Engineering), to research institutions like CIC ENERGIGUNE (Centro de Investigacion Cooperativa de Energias Alternativas Fundacion), POLITO (Politecnico di Torino), CEA (Commissariat A L’Energie Atomique et Aux Energies Alternatives), INEGI (Instituto De Ciencia e Inovacao em Engenharia Mecanica e Engenharia Industrial), and SIE (Sustainable Innovations Europe SL), each partner contributes expertise to different stages of the project.
Overall, NEXTCELL is committed to achieving fast and successful commercialization of the novel cell design, focusing on developing jellified cell materials and components to meet specific goals such as:
• Developing gel separators and electrolytes capable of operating up to 5 V vs Li+/Li, exhibiting an ionic conductivity comparable to that of a traditional porous separator soaked in a liquid electrolyte (> 1 mS/cm at RT).
• Designing gel composite LNMO (LiNi0.5Mn1.5O4) cathodes, that allow the operation at voltages up to 5 V vs Li+/Li and whose manufacturing process should not involve solvent usage.
• Creating gel silicon-carbon composite anodes with an initial reversible capacity of 90%, akin to graphite, but with a capacity of 1000 mAh/g.
• Implementing conductive carbon materials, particularly carbon nanotubes, known for their superior efficiency compared to traditional carbon conductors, to facilitate electrodes with enhanced electronic conductivity
FePO4 nanoparticles supported on mesoporous SBA-15: new interesting cathodes for Li-ion cells
No full textSimple approach using g-C3N4 to enable SnO2 anode high rate performance for Li ion battery
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High performance nanostructured mixed ortho-phosphates lithium insertion cathode materials
No full textProbing the interaction mechanism of heterostructured VOxNy nanoparticles supported in nitrogen-doped reduced graphene oxide aerogel as an efficient polysulfide electrocatalyst for stable sulfur cathodes
Full text linkReversible redox of sulfur to lithium sulfide through a series of lithium polysulfides (LiPS) still pose a key challenge to appreciate high-performance sulfur cathodes mainly because of shuttling phenomenon and sluggish kinetics. Herein, a simple novel synthetic approach has been presented to realize porous vanadium nitride oxide (VOxNy) nanoparticles spatially decorated within nitrogen doped reduced graphene aerogel (VONNG) via concurrent in-situ nitridation and carbonization processes. Nitrogen-doped reduced graphene aerogel enhances the physical retention and polar interaction of LiPS and contributes toward the overall conductivity of the matrix. Whereas, vanadium nitride oxide has exhibited a redox potential window intermediate to its oxides’ counterparts around which LiPS can form polythionate complexes to enhance the kinetics and LiPS retention by exploiting the V–N and V–O interfaces at cathode. The interaction mechanism has been probed through in-operando Raman spectroscopy, XPS and electroanalytical methods. The assembled cells from VONNG/S cathodes exhibit the initial discharge capacity of 1400 mAh g−1 at 0.05 C, 1250 mAh g−1 at 0.1 C and maintained reversible capacity about 700 mA h g−1 at 0.2 C after 200 cycles. The loss in capacity is less than 0.05% per cycle for 850 cycles with Coulombic efficiency close to 99% even at 5C
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
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