Understanding Of Working Mechanism Of Lithium Difluoro Oxalato Borate In Li Ncm85 Battery With Enhanced Cyclic Stability
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Understanding Of Working Mechanism Of Lithium Difluoro Oxalato Borate In Li Ncm85 Battery With Enhanced Cyclic Stability
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Author : Xuerui Yang
language : en
Publisher: OAE Publishing Inc.
Release Date : 2023-07-03
Understanding Of Working Mechanism Of Lithium Difluoro Oxalato Borate In Li Ncm85 Battery With Enhanced Cyclic Stability written by Xuerui Yang and has been published by OAE Publishing Inc. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-03 with Technology & Engineering categories.
Despite the significant advances achieved in recent years, the development of efficient electrolyte additives to mitigate the performance degradation during long-term cycling of high-energy density lithium||nickel-rich (Li||Ni-rich) batteries remains a significant challenge. To achieve a rational design of electrolytes and avoid unnecessary waste of resources due to trial and error, it is crucial to have a comprehensive understanding of the underlying mechanism of key electrolyte components, including salts, solvents, and additives. Herein, we present the utilization of lithium difluoro(oxalate) borate (B) (LiDFOB), a B-containing lithium salt, as a functional additive for Li||LiNi0.85Co0.1Mn0.05O2 (NCM85) batteries, and comprehensively investigate its mechanism of action towards enhancing the stability of both anode and cathode interfaces. The preferential reduction and oxidation decomposition of DFOB- leads to the formation of a robust and highly electronically insulating boron-rich interfacial film on the surface of both the Li anode and NCM85 cathode. This film effectively suppresses the consumption of active lithium and the severe decomposition of the electrolyte. Furthermore, the presence of B elements in the cathode-electrolyte interfacial film, such as BF3, BF2OH, and BF2OBF2 compounds, can coordinate with the lattice oxygen of the cathode, forming strong coordination bonds. This can significantly alleviate lattice oxygen loss and mitigate detrimental structural degradation of the Ni-rich cathode. Consequently, the Li||NCM85 battery cycled in LiDFOB-containing electrolyte displays superior capacity retention of 74% after 300 cycles, even at a high charge cut-off voltage of 4.6 V. The comprehensive analysis of the working mechanisms of LiDFOB offers valuable insights for the rational design of electrolytes featuring multifunctional lithium salts or additives for high energy density lithium metal batteries.
Ammonia Fuel Cells
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Author : Ibrahim Dincer
language : en
Publisher: Elsevier
Release Date : 2020-03-26
Ammonia Fuel Cells written by Ibrahim Dincer and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-26 with Science categories.
Ammonia Fuel Cells covers all aspects of ammonia fuel cell technologies and their applications, including their theoretical analysis, modeling studies and experimental investigations. The book analyzes the role of integrated ammonia fuel cell systems within various renewable energy resources and existing energy systems.
Eco Efficient Repair And Rehabilitation Of Concrete Infrastructures
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Author : Fernando Pacheco-Torgal
language : en
Publisher: Woodhead Publishing
Release Date : 2017-11-15
Eco Efficient Repair And Rehabilitation Of Concrete Infrastructures written by Fernando Pacheco-Torgal and has been published by Woodhead Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-11-15 with Technology & Engineering categories.
Eco-efficient Repair and Rehabilitation of Concrete Infrastructures provides an updated state-of-the-art review on eco-efficient repair and rehabilitation of concrete infrastructure. The first section focuses on deterioration assessment methods, and includes chapters on stress wave assessment, ground-penetrating radar, monitoring of corrosion, SHM using acoustic emission and optical fiber sensors. Other sections discuss the development and application of several new innovative repair and rehabilitation materials, including geopolymer concrete, sulfoaluminate cement-based concrete, engineered cementitious composites (ECC) based concrete, bacteria-based concrete, concrete with encapsulated polyurethane, and concrete with super absorbent polymer (SAPs), amongst other topics. Final sections focus on crucial design aspects, such as quality control, including lifecycle and cost analysis with several related case studies on repair and rehabilitation. The book will be an essential reference resource for materials scientists, civil and structural engineers, architects, structural designers and contractors working in the construction industry. - Delivers the latest research findings with contributions from leading international experts - Provides fully updated information on the European standard on materials for concrete repair (EN 1504) - Includes an entire sections on the state-of-the-art in NDT, innovative repair and rehabilitation materials, as well as LCC and LCA information
Prostheses For The Brain
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Author : Andrej Kral
language : en
Publisher: Elsevier
Release Date : 2021-04-09
Prostheses For The Brain written by Andrej Kral and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-04-09 with Medical categories.
Prostheses for the Brain: Introduction to Neuroprosthetics bridges the disciplines required in the field of neuroprosthetics and provides the interdisciplinary base required for understanding neuroprosthetic devices. It introduces basic aspects from the physical, bioengineering and medical perspectives, and forms a common knowledge base. It provides the entrance to the field and sets realistic expectations, both regarding potentials as well as limitations, for the devices in both design and outcomes. The book additionally reviews the technology behind the most frequently used and most clinically successful neuroprosthetic devices. It provides the physiological background for their function, as well as the technology behind them. Finally, the authors suggest future possible developments that may play crucial role in new prostheses for the brain. This gives the reader a comprehensive view on the principles and applications of neuroprostheses. This book has been built from the authors course they teach on neuroprostheses and is ideal for students, engineers and medical professionals in this field. Introduces the general principles of conductivity of electrolytes and the processes at the tissue-electrode interface Describes safety issues and regulatory rules, clarifies conceptual differences between stimulating and sensing electrodes Reviews stimulation strategies, tissue reactions, potential medical complications, brain adaptations and the clinically most successful applications of neuroprostheses
Increased Cycling Performance Of Li Ion Batteries By Phosphoric Acid Modified Lini0 5mn1 5o4 Cathodes In The Presence Of Lithium Bis Oxalato Borate
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Author : Maheeka Yapa Abeywardana
language : en
Publisher:
Release Date : 2018
Increased Cycling Performance Of Li Ion Batteries By Phosphoric Acid Modified Lini0 5mn1 5o4 Cathodes In The Presence Of Lithium Bis Oxalato Borate written by Maheeka Yapa Abeywardana and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Borates categories.
Mechanisms Of Discharge Product Evolution And Solvent Stability In Lithium Oxygen Batteries
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Author : Thomas Peter Batcho
language : en
Publisher:
Release Date : 2018
Mechanisms Of Discharge Product Evolution And Solvent Stability In Lithium Oxygen Batteries written by Thomas Peter Batcho and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Lithium-oxygen batteries offer the possibility of achieving twice the gravimetric energy density of lithium-ion batteries. However, several challenges remain to achieve commercially-available lithium-oxygen batteries. Capacity must be optimized by maximizing the formation of Li2O2 discharge product. Side reactions with the solvent and electrode must be suppressed. This study seeks to improve understanding of the mechanisms of Li2O2 evolution and Li-O2 decomposition reactions in order to design strategies to optimize capacity and stability. Decomposition reactions in the solvent dimethyl sulfoxide were studied due to conflicting reports about its stability. Discharged electrodes in dimethyl sulfoxide were aged for varying amounts of time then characterized. Li2O2 reacted with dimethyl sulfoxide to form LiOH and dimethyl sulfone. This demonstrated that dimethyl sulfoxide is unsuitable for commercial application. The study also illustrated the importance of performing aging studies in the discharged condition to determine the stability of Li-O2 battery components. Adding small amounts of water to Li-O2 solvents has been demonstrated to enhance capacity but the effect on stability was not well understood. Discharges were performed in dimethoxyethane and acetonitrile with and without added water. Water caused an unwanted side reaction to form LiOH in acetonitrile but not in dimethoxyethane, due to a higher favorability of deprotonation in acetonitrile. Interactions between capacity enhancing additives and solvent molecules must be carefully studied to avoid side reactions. A model of the two competing mechanistic pathways of Li-O2 discharge was developed to understand how these pathways depend on discharge conditions and solvent properties. The model was fitted to experimental results from rotating ring-disk electrode discharges in order to check that model assumptions were physical. The model demonstrates that Li2O2 film evolution is heavily dependent on solvent properties and that promotion of toroidal Li2O2 primarily depends on slower surface passivation rather than faster solvation of lithium superoxide.
Investigations On Lithium Difluoro Oxalato Borate Based Electrolytes For Use Lithium Metal Based Secondary Batteries
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Author : Tanja Schedlbauer
language : en
Publisher:
Release Date : 2014
Investigations On Lithium Difluoro Oxalato Borate Based Electrolytes For Use Lithium Metal Based Secondary Batteries written by Tanja Schedlbauer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Molecular Interactions Of The Difluoro Oxalato Borate Anion And Its Application For Lithium Ion Battery Electrolytes
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Author : Joshua Lee Allen
language : en
Publisher:
Release Date : 2013
Molecular Interactions Of The Difluoro Oxalato Borate Anion And Its Application For Lithium Ion Battery Electrolytes written by Joshua Lee Allen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Dynamics Of Lithium Deposition In Lithium Sulfur Batteries And Strategies For Enhancing Lithium Cycling Efficiencies
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Author : Sanjay Nanda
language : en
Publisher:
Release Date : 2020
Dynamics Of Lithium Deposition In Lithium Sulfur Batteries And Strategies For Enhancing Lithium Cycling Efficiencies written by Sanjay Nanda and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
The lithium-sulfur (Li-S) couple is one of the most promising chemistries for realizing the next generation of high energy density rechargeable batteries. Over the last decade, there have been concerted efforts towards solving the issues with the sulfur cathode. However, maintaining reasonable cycle life in practically relevant cell designs with a limited lithium inventory and lean electrolyte supply has proven quite difficult. It can be primarily attributed to the poor reversibility of the lithium-metal anode, which undergoes high-surface area mossy growth mechanisms and severe parasitic side reactions with the electrolyte during plating and stripping. Solving this challenge is key to Li-S batteries realizing their commercial viability. Furthermore, lithium deposition in the Li-S system is uniquely convoluted by the presence of soluble polysulfide intermediates in the liquid electrolyte. In this dissertation, the dynamics of lithium deposition in Li-S batteries are systematically investigated with an anode-free full cell configuration, and the mechanisms underlying the interplay between lithium-electrolyte interfacial chemistry and degradation of lithium inventory are delineated. A generalized strategy involving molecular engineering of polysulfide species and exploiting the intrinsic shuttle effect is developed for improving efficiencies of lithium plating and stripping and cyclability under realistic limited-lithium and lean-electrolyte conditions. In Chapter 1, a general overview of the Li-S battery system is provided, including a description of the electrochemistry of sulfur cathodes, the role and dynamic behavior of lithium-metal anode, and the challenges and opportunities presented by the distinct chemistry of the polysulfide-rich electrolyte. In Chapter 2, general experimental details encompassing cathode preparation, cell assembly, electrochemical measurements, and materials characterization are outlined. In Chapter 3, the anode-free full cell configuration, which pairs a Li2S cathode with a bare current collector and contains no excess lithium, is introduced as the ideal framework for investigating lithium deposition in Li-S batteries. In Chapter 4, the anode-free full cell configuration is used to determine a quantitative estimate of the rate of lithium inventory depletion with cycling. ToF-SIMS measurements reveal the growth of a thick electrolyte decomposition layer with cycling, which blocks ionic access to “dead” metallic lithium underneath. In Chapter 5, the chemistry of lithium-electrolyte interface and its impact on the dynamics of lithium deposition is carefully investigated. Specifically, the critical role of LiNO3 and polysulfides in modulating lithium deposition in Li-S batteries is elucidated. In Chapter 6, the introduction of tellurium as a cathode additive is demonstrated as an effective strategy for improving the cycle life of high energy anode-free, lean-electrolyte Li-S cells. Soluble tellurium containing species are formed, which shuttle to the anode side and form a stabilizing interfacial layer in-situ on lithium surface. In Chapter 7, this molecular engineering approach is further developed by investigating the chemistry of substituting selenium and tellurium into polysulfide species. While Se substitution improves charge-transfer and redox kinetics at the sulfur cathode, Te substitution engenders a substantial improvement in the reversibility of lithium anode. Finally, Chapter 8 concludes with a summary of all the work carried out in this dissertation and a perspective on future Li-S battery research
Deep Understanding Of Degradation In Lithium Ion Batteries Through Experimental And First Principles Study
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Author : Yufang He
language : en
Publisher:
Release Date : 2019
Deep Understanding Of Degradation In Lithium Ion Batteries Through Experimental And First Principles Study written by Yufang He and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
"The growing interests in Lithium-ion Batteries (LIBs) have significantly accelerated the development of active materials. However, the key challenge is that electrode materials suffer from degradation, which include transition metal dissolution, solid electrolyte interphase (SEI) layer formation, and mechanical fracture. To address these issues, applying an ultrathin coating onto active materials via Atomic Layer Deposition (ALD) is an efficient way. Although numerious works have been done for active material performance improvement via ALD technology, the fundamental enhancement mechanisms of ALD coating on battery performance improvement are not yet known. Therefore, this dissertation consists of four papers, which focused on the ALD coating impact on Li intercalation, metal dissolution, Li ion diffusivity and interfacial property of SEI layer via first-principles study. Paper I explained why CeO2 coating has better performance than Al2O3 coating material via faster Li diffusion, facile intercalation, and less mechanical damage of coating. Paper II discovered an unexpected metal dissolution that ultrathin CeO2 coating intensifies the Mn dissolution of LMO and it was confirmed in several ways, including ICP-OES measurement, Mn vacancy formation energy calculation, COOP analysis, PDOS analysis, and cell level performance. Paper III revealed that the ALD CeO2 coating thickness impact on Li ion diffusivity in coated LMO is related to surface and bulk diffusion domination and phase transition of coating layers. Paper IV demonstrated that the fracture strength of inorganic components of SEI layer was higher than organic component, implying that the inorganic-organic interface can effectively block electron transport from electrolyte to anode particles to prevent futher oxidation of active materials"--Abstract, page iv.