The rapid capacity loss suffered by P2‐type Mn‐based layered oxide cathode materials, caused by deleterious high‐voltage phase transformations and the dissolution of active materials, greatly limits ...their application in large‐scale sodium‐ion battery installations. In this study, a novel P2/O3 biphasic cathode is developed using a multi‐element (Fe, Mg, and Li) co‐substitution strategy. The results of ex situ X‐ray diffraction analyses and the absence of significant voltage plateaus in the charge–discharge profiles of cells featuring the proposed cathode indicate that deleterious phase transformations and concomitant lattice mismatch in the high‐voltage region are effectively suppressed because of the topotactic intergrown structure of the resulting cathode. The optimized cathode also demonstrates improved structural stability and enhanced Na+ diffusion kinetics, owing to the incorporation of stabilizing dopant pillars and suppressed metal‐ion dissolution. Hence, the resulting Na half cell demonstrates a high initial capacity of 170.5 mA h g−1 at 0.1 C and excellent rate capability (106.6 mA h g−1 at 10 C). Furthermore, the resulting Na full cell, featuring a hard carbon anode, displays excellent cycling stability (72.1% capacity retention after 400 cycles), demonstrating its practical viability. This study presents the design and optimization of high‐performance Mn‐based cathodes.
A novel multi‐element co‐substituted P2/O3 heterostructured cathode material is developed and comprehensively evaluated. Benefiting from its topotactic intergrown structure, the optimized cathode material exhibits smooth phase evolution and less mechanical damage. In addition, the incorporation of low‐valence dopants increases the Na content and alleviates the dissolution of active materials, which improves the Na storage performance.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The high demand for clean and renewable energy has fueled the exploration of advanced energy storage systems. As a potential alternative device for lithium ion batteries, sodium ion batteries (NIBs) ...have attracted extraordinary attention and are becoming a promising candidate for energy storage due to their low cost and high efficiency. Recent progress has demonstrated that metal sulfides (MSs) are very promising electrode candidates for efficient Na‐storage devices, because of their excellent redox reversibility and relatively high capacity. In this review, recent developments of MSs as anode materials for NIBs are presented. The corresponding electrochemical mechanisms are briefly discussed. We also present critical issues, challenges, and perspectives with the hope of providing a fuller understanding of the associated electrochemical processes. Such an understanding is critical for tailoring and designing metal sulfides with the desired activity and stability.
Metal sulfides (MSs) hold great promise and attract wide‐ranging interest as anode materials for sodium ion batteries (NIBs) by virtue of their excellent redox reversibility and relatively high capacity. This review presents recent developments of MSs as anode materials for NIBs, providing a comprehensive understanding of the associated research progress.
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FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The topic of sustainable and eco‐friendly energy storage technologies is an issue of global significance. To date, this heavy burden is solely addressed by lithium‐ion battery technology. However, ...the ongoing depletion of limited global lithium resources has restricted their future availability for Li‐ion battery technology, and hence, a significant price increase is expected. This grim situation is the driving force for the development of the “beyond Li‐ion battery” strategy involving alternatives that have several advantages over conventional Li‐ion batteries in terms of cost, durability, safety, and sustainability. Potassium, the closest neighboring alkali element after sodium, offers some unique advantages over lithium and sodium as a charge carrier in rechargeable batteries. Potassium intercalation chemistry in potassium‐ion batteries (KIBs) is successfully demonstrated to be compatible with Li‐ion batteries and sodium‐ion batteries. In addition to KIBs, potassium–sulfur and potassium–oxygen batteries have emerged as new energy‐storage systems due to their low costs and high specific energy densities. This review covers the key technological developments and scientific challenges for a broad range of rechargeable potassium batteries, while also providing valuable insight into the scientific and practical issues concerning the development of potassium‐based rechargeable batteries.
Batteries that use potassium ions, such as potassium‐ion, potassium–sulfur, and potassium–oxygen batteries, are emerging technologies that can compete with lithium‐ion batteries in large‐scale energy‐storage applications. This review covers the key technological developments and scientific challenges for a broad range of potassium‐based batteries, while also providing valuable insight into the scientific and practical issues concerning the development of rechargeable potassium batteries.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The exploitation of effective strategies to accelerate the Na+ diffusion kinetics and improve the structural stability in the electrode is extremely important for the development of high efficientcy ...sodium‐ion batteries. Herein, Se vacancies and heterostructure engineering are utilized to improve the Na+‐storage performance of transition metal selenides anode prepared through a facile two‐in‐one route. The experimental results coupled with theoretical calculations reveal that the successful construction of the Se vacancies and heterostructure interfaces can effectively lower the Na+ diffusion barrier, accelerate the charge transfer efficiency, improve Na+ adsorption ability, and provide an abundance of active sites. Consequently, the batteries based on the constructed ZnSe/CoSe2‐CN anode manifest a high initial Coulombic efficiency (97.7%), remarkable specific capacities (547.1 mAh g–1 at 0.5 A g–1), superb rate capability (362.1 mAh g–1 at 20 A g–1), as well as ultrastable long‐term stability (1000 cycles) with a satisfied specific capacity (535.6 mAh g–1) at 1 A g–1. This work facilitates an in‐depth understanding of the synergistic effect of vacancies and heterojunctions in improving the Na+ reaction kinetics, providing an effective strategy to the rational design of key materials for high efficiency rechargeable batteries.
Vacancy and interface synergistic engineering is utilized to boost the electrochemical performance of bimetallic selenide (ZnSe/CoSe2‐CN)‐based sodium‐ion batteries. The as‐prepared composite manifests appealing Na+‐storage performance, including high initial Coulombic efficiency, good rate capability, and excellent stability. The proposed strategy is considerably facile and may shed light on designing advanced electrodes with intriguing electrochemical performance.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
This paper aims to investigate the relationship between customer resistance to innovation and customer churn based on young Chinese consumers' characteristics. This study uses smart phone apps as the ...product category. Based on the methodology of fuzzy-set Qualitative Comparative Analysis, this study uses 101 cases. Three major configurational results and core factors are found in this study. Configuration 1 points out the importance of affect response and functioning dimensions; configuration 2 points out the effect of emotional consumers’ attitude toward innovation; configuration 3 suggests that cognitive rigidity plays a critical role against innovation. This study bridges the academic gap between customer resistance to innovation and customer churn and adopts different methodologies to test and prove previous research. Based on the results, this study contributes to the customer churn studies from CRI with a different methodological angle compared with current studies in the consumer behavior domain. Meanwhile, this study provides managerial suggestions for marketing practitioners to reduce CRI and on how to make consumers accept the new products.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
With the ever‐increasing requirement for high‐energy density lithium‐ion batteries (LIBs) to drive pure/hybrid electric vehicles (EVs), considerable attention has been paid to the development of ...cathode materials with high energy densities because they ultimately determine the energy density of LIBs. Notably, the cost of cathode materials is still the main obstacle hindering the extensive application of EVs, with the cost accounting for 40% of the total cost of fabricating LIBs. Therefore, enhancing the energy density and simultaneously decreasing the cost of LIBs are essential for the success of EV/hybrid EV industries. Among the existing commercial cathodes, Ni‐rich layered cathodes are widely employed because of their high energy density, relatively good rate capability, and reasonable cycling performance. Ni‐rich layered cathodes containing Co are now being reconsidered due to the increasing price of Co, which is much higher than that of Ni and Mn. In this report, the recent developments and strategies in the improvement of the stabilities of the bulk and surface for Co‐less Ni‐rich layered cathode materials are reviewed.
A perspective on Co‐less Ni‐rich cathodes for lithium‐ion batteries (LIBs) is provided. LiNiO2, binary‐, ternary‐, and quaternary cathodes are classified as the past, present, and future of LIBs. Surface modification is a strategy for present ternary cathodes. Gradient strategies categorized into five types, from core–shell to hybrid structures, are the foundation for future cathodes to develop.
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FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
SARS-CoV-2 is a betacoronavirus responsible for the COVID-19 pandemic. Although the SARS-CoV-2 genome was reported recently, its transcriptomic architecture is unknown. Utilizing two complementary ...sequencing techniques, we present a high-resolution map of the SARS-CoV-2 transcriptome and epitranscriptome. DNA nanoball sequencing shows that the transcriptome is highly complex owing to numerous discontinuous transcription events. In addition to the canonical genomic and 9 subgenomic RNAs, SARS-CoV-2 produces transcripts encoding unknown ORFs with fusion, deletion, and/or frameshift. Using nanopore direct RNA sequencing, we further find at least 41 RNA modification sites on viral transcripts, with the most frequent motif, AAGAA. Modified RNAs have shorter poly(A) tails than unmodified RNAs, suggesting a link between the modification and the 3′ tail. Functional investigation of the unknown transcripts and RNA modifications discovered in this study will open new directions to our understanding of the life cycle and pathogenicity of SARS-CoV-2.
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•We provide a high-resolution map of SARS-CoV-2 transcriptome and epitranscriptome•The transcriptome is complex owing to numerous discontinuous transcription events•In addition to 10 canonical RNAs, SARS-CoV-2 produces RNAs encoding unknown ORFs•We discover at least 41 potential RNA modification sites with an AAGAA motif
The SARS-CoV-2 transcriptome and epitranscriptome reveal a complex array of canonical and non-canonical viral transcripts with RNA modifications.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UILJ, UL, UM, UPCLJ, UPUK, ZAGLJ, ZRSKP
Sodium-ion batteries: present and future Hwang, Jang-Yeon; Myung, Seung-Taek; Sun, Yang-Kook
Chemical Society reviews,
06/2017, Volume:
46, Issue:
12
Journal Article
Peer reviewed
Open access
Energy production and storage technologies have attracted a great deal of attention for day-to-day applications. In recent decades, advances in lithium-ion battery (LIB) technology have improved ...living conditions around the globe. LIBs are used in most mobile electronic devices as well as in zero-emission electronic vehicles. However, there are increasing concerns regarding load leveling of renewable energy sources and the smart grid as well as the sustainability of lithium sources due to their limited availability and consequent expected price increase. Therefore, whether LIBs alone can satisfy the rising demand for small- and/or mid-to-large-format energy storage applications remains unclear. To mitigate these issues, recent research has focused on alternative energy storage systems. Sodium-ion batteries (SIBs) are considered as the best candidate power sources because sodium is widely available and exhibits similar chemistry to that of LIBs; therefore, SIBs are promising next-generation alternatives. Recently, sodiated layer transition metal oxides, phosphates and organic compounds have been introduced as cathode materials for SIBs. Simultaneously, recent developments have been facilitated by the use of select carbonaceous materials, transition metal oxides (or sulfides), and intermetallic and organic compounds as anodes for SIBs. Apart from electrode materials, suitable electrolytes, additives, and binders are equally important for the development of practical SIBs. Despite developments in electrode materials and other components, there remain several challenges, including cell design and electrode balancing, in the application of sodium ion cells. In this article, we summarize and discuss current research on materials and propose future directions for SIBs. This will provide important insights into scientific and practical issues in the development of SIBs.
This review introduces current research on materials and proposes future directions for sodium-ion batteries.
A critical overview of the latest developments in the lithium ion batteries technology is reported. We first describe the evolution in the electrolyte area with particular attention to ionic liquids, ...discussing the expected application of these room temperature molten salts and listing the issues that still prevent their practical implementation. The attention is then focused on the electrode materials presently considered the most promising for enhancing the energy density of the batteries. At the anode side a discussion is provided on the status of development of high capacity tin and silicon lithium alloys. We show that the morphology that is the most likely to ensure commercial exploitation of these alloy electrodes is that involving carbon-based nanocomposites. We finally touch on super-high-capacity batteries, discussing the key cases of lithium-sulfur and lithium-air and attempting to forecast their chances to eventually reach the status of practically appealing energy storage systems. We conclude with a brief reflection on the amount of lithium reserves in view of its large use in the case of global conversion from gasoline-powered cars to hybrid and electric cars.
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