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Understanding the Reductive Decomposition of Highly Concentrated Li Salt/Sulfolane Electrolytes during Li Deposition and Dissolution
Get PDFLi deposition and dissolution in highly concentrated electrolytes consisting of sulfolane (SL) and two amide-type Li salts, LiN(SO2CF3)2 (LiTFSA) and LiN(SO2F)2 (LiFSA), were investigated. The chronopotentiometry test of Li/Cu cells containing these two electrolytes demonstrated that the reversibility of Li deposition/dissolution and the cycling performance were better in the LiFSA/SL electrolyte than in the LiTFSA/SL electrolyte. Gas analysis with electrochemical mass spectroscopy revealed that the SL molecules were reduced to form tetrahydrothiophene (THT) and butane in the LiTFSA/SL electrolyte during Li deposition. In contrast, these side reactions were significantly suppressed in the LiFSA/SL electrolyte. The X-ray photoelectron spectroscopy analysis for the deposited Li in the LiTFSA/SL electrolyte suggests that Li2O and sulfurous compounds were formed on the Li surface by the reductive decomposition of SL. For the LiFSA/SL electrolyte, the LiF-rich passivation layer derived from the FSA anion could effectively suppress further decomposition of SL, resulting in highly reversible Li deposition and dissolution
Impact of accelerated carbonation on geotechnical properties of recycled soil from construction sludge stabilized with paper sludge ash-based stabilizer and blast furnace cement
Get PDFIn Japan, it is imperative to develop sustainable methods for treating and recycling construction sludge. Use of conventional highly alkaline binder additives such as cement and lime risks environmental contamination. As a sustainable alternative, an accelerated carbonation method using carbon dioxide (CO2) was developed, and its effectiveness in treating recycled sludge stabilized with a paper sludge ash-based stabilizer and blast furnace cement type B was demonstrated. However, a significant research gap remains in understanding how carbonation influences geotechnical properties because most prior studies primarily focused on pH reduction via additive selection. This study addresses this gap through a comparative experimental analysis of carbonated and non-carbonated soil samples. The innovation of this work lies in evaluating carbonation as both an environmental neutralization process and a treatment that alters compaction, strength, and permeability. The results showed that carbonation reduced the soil pH to approximately 8.6, meeting environmental standards, while improving the maximum dry density (ρdmax) and compaction behavior. However, the cone index (qc) results revealed a reduction in the recycled soil strength owing to hydrate decomposition and weakened particle bonds. This can be minimized by maintaining optimal water content before treatment. Furthermore, analysis based on the k15 coefficient (permeability at 15 ◦C) suggests that carbonation affects hydraulic conductivity. In some cases, hydraulic conductivity increases because of ettringite decomposition, leading to the loss of crystalline structure and creation of continuous voids. These findings highlight that, although carbonation offers environmental benefits, its application must be carefully managed to ensure compliance with geotechnical performance requirements
LiMn2O4 電極／高濃度電解液界面における電荷移動反応速度に関する研究
Get PDF横浜国立大学博士（工学）この学位論文の全文は、中央図書館で平日17時までに申請することで閲覧が可能です。The full text of this thesis is available for viewing at the Central Library upon request by 5:00 p.m. on weekdays
Effect of cocrystallization on the combustion and detonation characteristics of fuel materials and oxidizers for energetic materials
Get PDF横浜国立大学博士（工学）この学位論文の全文は、中央図書館で平日17時までに申請することで閲覧が可能です。The full text of this thesis is available for viewing at the Central Library upon request by 5:00 p.m. on weekdays
Interregional, international interdependence and regional economic growth : an input‐output analysis focus on Xinjiang Uygur Autonomous Region of China
Get PDF横浜国立大学博士（経済学
Study on development of transparent and fluorescent α-SiAlON ceramics
Get PDF横浜国立大学博士（工学）この学位論文の全文は、中央図書館で平日17時までに申請することで閲覧が可能です。The full text of this thesis is available for viewing at the Central Library upon request by 5:00 p.m. on weekdays
