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A study on the next-generation secondary batteries incorporating vanadium oxide-based cathodes
No full textMetal battery systems have emerged as promising candidates for next-generation energy storage due to their high capacity and low cost. Among them, high-power and energy lithium metal batteries (LMBs) and high- energy and safe aqueous zinc metal batteries (AZMBs) are considered two of the most promising and complementary systems for modern applications, including electric vehicles (EVs), advanced air mobility (AAM), and grid-scale energy storage systems (ESSs). However, the practical deployment of these systems remains hindered by electrode structural degradation and interfacial instability. To address these challenges, this dissertation presents system-level design strategies with in-depth degradation mechanism studies for both LMBs and AZMBs, focused on the use of vanadium oxide (VO) cathodes. VO is particularly attractive due to its high theoretical capacity, structural versatility, and cost-effectiveness, making it a strong candidate for achieving high-performance metal battery systems. For the LMB system, configuration of a low-voltage, high-capacity structural modified VO cathode with a low-concentration ether-based electrolyte (1 M LiFSI in DME, denoted E-LCE) is suggested. The nanoplate- stacked VO structure facilitates short Li+ diffusion pathways, while the E-LCE enables the formation of a thin, ionically conductive sulfur-rich cathode–electrolyte interphase (CEI) and a robust, elastic solid electrolyte interphase (SEI) on the lithium metal anode. This synergistic design delivers stable cycling at high current densities (5 C, full cell) and induces a favorable phase transition from α– to γ′– V2O5, enhancing both power and energy densities, along with long-term stability. Simultaneously, degradation mechanisms in VO-based AZMBs are elucidated, with particular focus on vanadium ion cross-talk as a critical but underexplored degradation pathway. Using a V2O5·nH2O cathode and 2 M ZnSO4 electrolyte, a vanadium shuttling is identified, in which dissolved vanadium species undergo spontaneous reduction at the zinc anode, leading to interfacial instability, open-circuit voltage (OCV) drift, and capacity fading, especially under moderate current densities (<500 mA g−1). From these findings, holistic strategies to suppress shuttling are also proposed. This dissertation highlights the importance of physicochemical insights into both material structures and interfacial reactions for the rational design of high performance next-generation metal battery systems.DoctorAbstract i
Contents ii
List of Figures iv
List of Tables x
Chapter 1. Introduction 1
Chapter 2. Design Strategy for High-Performance Lithium Metal Batteries: From Materials to Interfaces 10
2.1. Introduction 10
2.2. Research Background 15
2.2.1. Challenges and Opportunities in Lithium Metal Anodes 15
2.2.2. Critical Role of Electrode−Electrolyte Interfaces 16
2.2.3. Cathode Materials for Lithium Metal Batteries 19
2.2.4 Phase Transition of V2O5 and the Corresponding Operating Potential Range 22
2.3. Structural Modification of Vanadium Oxide Cathode 24
2.3.1. Motivation and Objectives 24
2.3.2. Experiments 26
2.3.3. Results and Discussion 28
2.3.3.1. Design of a high-performance vanadium oxide cathode through nanoarchitecture 28
2.3.3.2. Material Characterization of nanoplate-stacked vanadium oxide cathode 34
2.3.3.3. Electrochemical analysis of nanoplate–stacked vanadium oxide cathode 41
2.3.3.4. Cell performance of a LMB full-cell 45
2.3.4. Conclusion 48
2.4. Interfacial Engineering for High-Energy, High-Power, and Long-Life Lithium Metal Batteries 49
2.4.1. Motivation and Objectives 49
2.4.2. Experiments 51
2.4.3. Results and Discussion 54
2.4.3.1. Structural characterization of pristine VO and its electrochemical behavior 54
2.4.3.2. The interfacial evolution of the VO cathodes 76
2.4.3.3. The structural evolution of the VO cathodes 84
2.4.3.4. The electrochemical performances and stabilities of lithium metal anodes 90
2.4.3.5. High-energy and high-power performance of LMB full-cells 100
2.4.4. Conclusion 104
Chapter 3. A Mechanistic Study of Cross-Talk Toward Understanding Performance Degradation in Vanadium-Based Aqueous Zinc Metal Batteries 113
3.1. Introduction 113
3.2. Research Background 118
3.2.1. Vanadium Oxide Cathodes for Aqueous Zinc Metal Batteries 118
3.2.2. Undesirable Issues in VO-based AZMBs 122
3.2.3. Cathode-to-Anode Crosstalk 125
3.3. Experiments 128
3.4. Results and Discussion 130
3.4.1. Electrode characterization and electrochemical indications of interfacial cross-talk 130
3.4.2. Cathode reversibility and its limitation in explaining cross-talk 138
3.4.3. Current-density-dependent interfacial redox interactions between vanadium species and Zn anode 143
3.4.4. Voltage-driven onset of vanadium dissolution initiating cathode‒anode cross-talk 155
3.4.5. Redox-driven vanadium shuttling and self-discharge behavior in AZMBs 158
3.4.6. Mechanistic summary of vanadium-induced hidden cross-talk in VO-based AZIBs 165
3.5. Conclusion 167
Chapter 4. Conclusion 173
Acknowledgements 17
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
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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