Integrated Approach for Aqueous Zinc-ion Batteries with Metal-ion Doped Hydrated Vanadate Cathode Materials and Surface-modified Zn Anode PDF Download

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Languages : en
Pages : 0

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Author: Mei Han
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Battery offers a viable solution for storing intermittent energy supplies associated with renewable energy production. Although lithium-ion batteries take up the most battery market, they are still limited by lithium metal resources, high cost and safety concerns. With this regard, aqueous batteries with mildly acidic electrolytes hold a promise for large-scale energy storage. In particular, zinc, as an attractive alternative to lithium metal, has been employed in aqueous rechargeable batteries due to its low-cost, high safety and environmental friendliness. Layered vanadium oxide (V2O5) as cathode material has gained enhanced interests in the studies of rechargeable aqueous zinc-ion batteries (RAZBs) due to its relatively high capacity. However, commercial V2O5 shows poor stability during cycling since the zinc ion intercalation causes degradation of the cathode and battery components. Therefore, in this project, two strategies involve surface coating and metal-ion doping are utilized to improve the electrochemical performance of vanadium-based electrodes in RAZBs. First, we introduce a coating method to fabricate polymer-modified cathode materials for aqueous zinc-ion batteries, which display improved electrochemical performances under both ambient and elevated temperature conditions. A polypyrrole-coated cathode is demonstrated, and the assembled battery deliveries a high capacity of 195.7 mAh·g-1 at the current rate of 5 C (200 mAh·g-1 corresponds 1 C), with only 9.5% capacity decay at room temperature after 200 cycles. At an elevated temperature (60°C), the polymer-coated battery still shows outstanding capacity retention, of 80% vs. 25% for bare V2O5 cathode after 150 cycles. Therefore, coating conductive polymers on the surface of cathode materials stabilizes the structure of the positive electrode at high temperatures and offer a viable approach to realize the thermal stability of such batteries. Second, two kinds of metal ions (Zn2+ and Na+) are doped simultaneously into the V2O5 interlayer by a molar ratio of Zn:Na = 0.3:0.43 to form a metal-ion doped cathode material Zn0.3Na0.43V2O5 (ZNVO). To enlarge the specific surface area, the commercial V2O5 is optimized into nanobelts by a hydrothermal method. The doped positive electrode in 2M ZnSO4 electrolytic solution reaches over 300 mAh·g-1 initial discharge capacity at 5 C, which is much higher than that of undoped electrode material (V2O5 nanobelts). Besides, in order to prevent the extraction of Na ions from the positive electrode, additional 2M sodium salt is added to the 2M ZnSO4 aqueous solution to prepare a dual-ion electrolyte. This dual-ion system (containing dual ion-doped positive electrode and dual ion electrolyte) offers a long-term cycle life, ~ 89% capacity retention after 4000 cycles, and a relatively high discharge capacity of 190 mAh·g-1 at 5 C during fast charge/discharge process. More importantly, this dual-ion electrolyte effectively suppresses zinc dendrite formation on the anode surface because of the electrostatic shield mechanism, where creating a positively charged shield around the sharp zinc protuberances. Thus, this dual-ion system provides the excellent electrochemical performance of Zn // ZNVO batteries and holds a promise for realizing practical applications of zinc-ion batteries.

Author: Licheng Miao
Publisher: OAE Publishing Inc.
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 31

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Mildly acidic aqueous zinc (Zn) batteries are promising for large-energy storage but suffer from the irreversibility of Zn metal anodes due to parasitic H2 evolution, Zn corrosion, and dendrite growth. In recent years, increasing efforts have been devoted to overcoming these obstacles by regulating electrolyte structures. In this review, we investigate progress towards mildly acidic aqueous electrolytes for Zn batteries, with special emphasis on how the microstructures (in the bulk phase and on the surface of Zn anodes) affect the performance of Zn anodes. Moreover, effective computational simulations and characterization measurements for the structures of bulk electrolytes and Zn/electrolyte interfaces are discussed, along with perspectives for the direction of further investigations.

Author: Haiyan Wang
Publisher: John Wiley & Sons
ISBN: 352734974X
Category : Technology & Engineering
Languages : en
Pages : 341

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Aqueous Zinc Ion Batteries Pioneering reference book providing the latest developments and experimental results of aqueous zinc ion batteries Aqueous Zinc Ion Batteries comprehensively reviews latest advances in aqueous zinc ion batteries and clarifies the relationships between issues and solutions for the emerging battery technology. Starting with the history, the text covers essentials of each component of aqueous zinc ion batteries, including cathodes, anodes, and electrolytes, helping readers quickly attain a foundational understanding of the subject. Written by three highly qualified authors with significant experience in the field, Aqueous Zinc Ion Batteries provides in-depth coverage of sample topics such as: History, main challenges, and zinc metal anodes for aqueous zinc ion batteries Electrochemical reaction mechanism of aqueous zinc ion batteries and interfacial plating and stripping on zinc anodes Cathode materials for aqueous zinc ion batteries, covering manganese-based materials, vanadium-based materials, Prussian blue analogs, and other cathode materials Development of electrolytes, issues, and corresponding solutions for aqueous zinc ion batteries Separators for aqueous zinc ion batteries, development of full zinc ion batteries, and future perspectives on the technology A detailed resource on a promising alternative to current lithium-ion battery systems, Aqueous Zinc Ion Batteries is an essential read for materials scientists, electrochemists, inorganic chemists, surface chemists, catalytic chemists, and surface physicists who want to be on the cutting edge of a promising new type of battery technology.

Author: Zongping Shao
Publisher: John Wiley & Sons
ISBN: 3527350462
Category : Technology & Engineering
Languages : en
Pages : 309

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Zinc–Air Batteries Authoritative and comprehensive resource covering foundational knowledge of zinc–air batteries as well as their practical applications Zinc–Air Batteries provides a comprehensive understanding of the history and development of Zn–air batteries, with a systematic overview of components, design, and device innovation, along with recent advances in the field, especially with regards to the cathode catalyst design made by cutting-edge materials, engineering processes, and technologies. In particular, design principles regarding the key components of Zn–air batteries, ranging from air cathode, to zinc anode, and to electrolyte, are emphasized. Furthermore, industrial developments of Zn–air batteries are discussed and emerging new designs of Zn–air batteries are also introduced. The authors argue that designing advanced Zn–air battery technologies is important to the realization of efficient energy storage and conversion—and, going further, eventually holds the key to a sustainable energy future and a carbon-neutral goal. Edited and contributed to by leading professionals and researchers in the field, Zinc–Air Batteries also contains information regarding: Design of oxygen reduction catalysts in primary zinc–air batteries, including precious metals, single-atoms, carbons, and transition metal oxides Design of bifunctional oxygen catalysts in rechargeable zinc–air batteries, covering specific oxygen redox reactions and catalyst candidates Design of three-dimensional air cathode in zinc–air batteries, covering loading of carbon-based and transition metal catalysts, plus design of the three-phase interface Design of electrolyte for zinc–air batteries, including liquid electrolytes (e.g., alkaline) and gel polymer electrolytes (e.g., PVA hydrogel) For students, researchers, and instructors working in battery technologies, materials science, and electrochemistry, and for industry and government representatives for decision making associated with energy and transportation, Zinc–Air Batteries summarizes the research results on Zn–air batteries and thereby helps researchers and developers to implement the technology in practice.

Author: Kamalambika Muthukumar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Renewable energy generation is forecast to rise rapidly, increasing almost 60% from 2020 to 2026 (International Energy Agency's 2021 report). This is the driving force for developing better and safer large-scale energy storage systems. Despite the lithium-ion batteries (LIB) dominating the global energy market due to their higher specific capacity and energy density, the poor safety feature of LIBs owing to their usage of flammable organic electrolytes is a significant concern for their application in large-scale electrical energy storage (EES) systems. Aqueous zinc ion battery (AZIB) systems are particularly attractive as a promising candidate for large-scale EES systems due to their high theoretical gravimetric capacity (820 mAh/g) and volumetric capacity (5855 mAh/cm3), low redox potential (-0.76V) of the zinc metal anodes. In addition to that, AZIB is a safer and more cost-effective alternative to the LIB systems because of the use of aqueous electrolytes with higher safety feature and higher ionic conductivity (1 S cm−1). Despite the advantages, AZIB possesses complications associated with the larger ionic radii of the hydrated Zn2+ ions (4.3 Å) and higher electrostatic attraction of the divalent Zn2+ ion with the cathode structures leading to severe capacity fading and poor cycling stability. This thesis focuses on the impact of defect engineering, interlayer expansion, and the addition of conductive carbon in optimizing the electrochemical Zn2+ storage properties of the classical layered cathode structures such as V2O5, MoS2. In the first study, we report the preparation of a set of hybrid materials consisting of Molybdenum disulfide (MoS2) nanopatches on reduced graphene oxide (rGO) nanosheets by applying the microwave specific heating of graphene oxide (GO) and molecular molybdenum precursors followed by thermal annealing in 3% H2 and 97% Ar. The microwave process converts GO to ordered rGO nanosheets that are sandwiched between uniform thin layers of amorphous Molybdenum trisulfide (MoS3). The subsequent thermal annealing converts the intermediate layers into MoS2 nanopatches with two-dimensional layered structures whose defect density is tunable by controlling the annealing temperature at 250, 325, and 600 °C, respectively. The Zn-ion storage properties strongly depend on the defects in the MoS2 adlayer. The highly defective MoS2/rGO hybrid prepared by annealing at 250 °C shows the highest initial Zn-ion storage capacity (~300 mAh g[subscript MoSx]−1) and close to 100% coulombic efficiency, which is dominated by pseudocapacitive surface reactions at the edges or defects in the MoS2 nanopatches. This study validates that defect engineering is critical in improving Zn-ion storage. In the second approach, the synthesis of hybrid materials consisting of Vanadium pentoxide (V2O5) nanoribbons (NRs) and rGO nanosheets by divalent metal cation mediated coprecipitation is adopted toward high-performance cathodes for AZIB. The divalent metal ions M2+ (including Zn2+ and Mn2+) effectively neutralize the negative charges on the surface of microwave exfoliated V2O5 NRs and GO nanosheets to form a strongly bound assembly. The hybrids are further annealed in the N2 atmosphere to convert the GO into rGO to improve the electrical conductivity. When only Zn2+ ions are used during coprecipitation, the Zn-V2O5 NR/rGO hybrid shows a high reversible specific capacity of ~386 mAh g−1 at 0.50 A g−1 suffers from poor stability. This is improved by mixing some Mn2+ with the Zn2− ions during coprecipitation. The (Mn+Zn)-V2O5 NR/rGO hybrid shows a slightly lower specific capacity of ~289 mAh g−1 at 0.5 A g−1 but with improved long-cycling stability and rate-performance due to the stronger binding of Mn2+ ions with the V2O5 host which serve as stable pillars to support the expanded V2O5 layers. This study ratifies the importance of morphology control in improving the ionic and electronic conductivity of the hybrid cathode structures and preventing structural collapse upon repeated intercalation/deintercalation cycles.

Author: Suresh C. Pillai
Publisher: IOP Publishing Limited
ISBN: 9780750333177
Category : Science
Languages : en
Pages : 200

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This reference text provides a comprehensive overview of the latest developments in 2D materials for energy storage and conversion. It covers a wide range of 2D materials and energy applications, including 2D heterostructures for hydrogen storage applications, cathode and anode materials for lithium and sodium-ion batteries, ultrafast lithium and sodium-ion batteries, MXenes for improved electrochemical applications and MXenes as solid-state asymmetric supercapacitors. 2D Materials for Energy Storage and Conversion is an invaluable reference for researchers and graduate students working with 2D materials for energy storage and conversion in the fields of nanotechnology, electrochemistry, materials chemistry, materials engineering and chemical engineering. Key Features: Provides a comprehensive overview of the latest developments in 2D materials for energy storage and conversion technologies Covers the most promising candidates for radically advanced energy storage Covers 2D heterostructures and provides a holistic view of the subject Includes 2D materials beyond graphene, defects engineering, and the main challenges in the field

Author: Jean-Marie Tarascon
Publisher: John Wiley & Sons
ISBN: 1118998146
Category : Science
Languages : en
Pages : 96

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The electrochemical storage of energy has become essential in assisting the development of electrical transport and use of renewable energies. French researchers have played a key role in this domain but Asia is currently the market leader. Not wanting to see history repeat itself, France created the research network on electrochemical energy storage (RS2E) in 2011. This book discusses the launch of RS2E, its stakeholders, objectives, and integrated structure that assures a continuum between basic research, technological research and industries. Here, the authors will cover the technological advances as well as the challenges that must still be resolved in the field of electrochemical storage, taking into account sustainable development and the limited time available to us.

Author: Minghua Zhou
Publisher: Springer
ISBN: 9811064067
Category : Science
Languages : en
Pages : 437

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This volume discusses the theoretical fundamentals and potential applications of the original electro-Fenton (EF) process and its most innovative and promising versions, all of which are classified as electrochemical advanced oxidation processes. It consists of 15 chapters that review the latest advances and trends, material selection, reaction and reactor modeling and EF scale-up. It particularly focuses on the applications of EF process in the treatment of toxic and persistent organic pollutants in water and soil, showing highly efficient removal for both lab-scale and pre-pilot setups. Indeed, the EF technology is now mature enough to be brought to market, and this collection of contributions from leading experts in the field constitutes a timely milestone for scientists and engineers.

Author: Fritz Scholz
Publisher: Springer Science & Business Media
ISBN: 3540261907
Category : Science
Languages : en
Pages : 299

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Immobilizing particles or droplets on electrodes is a novel and most powerful technique for studying the electrochemical reactions of three-phase systems. It gives access to a wealth of information, ranging from quantitative and phase analysis to thermodynamic and kinetic data of electrode processes. Three-phase electrodes with immobilized droplets provide information on the electrochemistry of redox liquids and of compounds dissolved in inert organic liquids. Such measurements allow the determination of the Gibbs energies of the transfer of cations and anions between immiscible solvents, and thus make it possible to assess the hydrophobicity of ions – a property that is of great importance for pharmaceutical applications, biological studies, and for many fields of chemistry. The monograph gives, for the first time, a comprehensive overview of the results published in more than 300 papers over the last 15 years. The experiments are explained in detail, applications from many different fields are presented, and the theoretical basis of the systems is outlined.