Understanding And Mitigating Degradation In Li Ion Batteries
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Understanding And Mitigating Degradation In Li Ion Batteries
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Author : Eric Logan
language : en
Publisher:
Release Date : 2022
Understanding And Mitigating Degradation In Li Ion Batteries written by Eric Logan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
The market for Li-ion batteries has seen unprescedented growth in recent years due to the adoption of electric vehicles (EVs) and growth of grid-level energy storage. For these applications to be sustainable, inexpensive and long-lasting Li-ion batteries are required. This thesis considers LiFePO4 (LFP) as a positive electrode material for use in long-lifetime Li-ion batteries. Already a commercially used material, LFP is seeing a renewed interest in many applications due to the cost and relative scarcity of commonly used transition metals in Li-ion batteries, Ni and Co. Initial studies of LFP/graphite cells considered the impact of water contamination and different electrolyte additives on lifetime, and an optimal electrolyte composition was determined. Isothermal microcalorimetry techniques were used to rank the lifetime of cells with different electrolyte additives. Next, different approaches were taken to improve the lifetime of LFP/graphite cells, including considering the surface area of LFP, different Li salts in the electrolyte, and different graphite materials. Combining the results of these studies led to an LFP cell with greatly improved capacity retention. Isothermal microcalorimetry techniques were developed to observe parasitic reactions separately at the positive and negative electrodes, and to infer the degree of "cross-talk" reactions in the cell. Finally, the storage performance, gas evolution, and parasitic heat flow for Li-ion cells with different positive electrodes, negative electrodes, and electrolytes were studied. The results of these experiments highlighted the complex interactions that occur between different components of the cell. In LFP cells, capacity loss was correlated with the reactivity of the negative electrode. The results presented in this thesis demonstrate significant lifetime improvements for LFP/graphite cells by targeting different cell components. Additional insights into the role of parasitic reactions on the lifetime of Li-ion cells have been developed. This work should contribute to the future development of Li-ion cells with extremely long lifetimes.
Understanding And Mitigating The Electrochemical Mechanical Degradation Of High Capacity Battery Electrodes
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Author : Dingying Dang
language : en
Publisher:
Release Date : 2020
Understanding And Mitigating The Electrochemical Mechanical Degradation Of High Capacity Battery Electrodes written by Dingying Dang 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.
Understanding And Mitigating Metallic Anode Degradation In Divalent Battery Systems
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Author : Shengda Pu
language : en
Publisher:
Release Date : 2022
Understanding And Mitigating Metallic Anode Degradation In Divalent Battery Systems written by Shengda Pu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
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From Intrinsic To Extrinsic Design Of Lithium Ion Battery Layered Oxide Cathode Material Via Doping Strategies
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Author : Chul-Ho Jung
language : en
Publisher: Springer Nature
Release Date : 2022-10-20
From Intrinsic To Extrinsic Design Of Lithium Ion Battery Layered Oxide Cathode Material Via Doping Strategies written by Chul-Ho Jung and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-20 with Technology & Engineering categories.
This book addresses the comprehensive understanding of Ni-rich layered oxide of lithium-ion batteries cathodes materials, especially focusing on the effect of dopant on the intrinsic and extrinsic effect to its host materials. This book can be divided into three parts, that is, 1. overall understanding of layered oxide system, 2. intrinsic effect of dopant on layered oxides, and 3. extrinsic effect of dopant on layered oxides. To truly understand and discover the fundamental solution (e.g. doping) to improve the Ni-rich layered oxides cathodic performance, understanding the foundation of layered oxide degradation mechanism is the key, thus, the first chapter focuses on discovering the true degradation mechanisms of layered oxides systems. Then, the second and third chapter deals with the effect of dopant on alleviating the fundamental degradation mechanism of Ni-rich layered oxides, which we believe is the first insight ever been provided. The content described in this book will provide research insight to develop high-performance Ni-rich layered oxide cathode materials and serve as a guide for those who study energy storage systems.
Understanding Lithium Plating In Lithium Ion Batteries And Exploring Mitigation Strategies By Self Heating
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Author : Daniel Marple
language : en
Publisher:
Release Date : 2017
Understanding Lithium Plating In Lithium Ion Batteries And Exploring Mitigation Strategies By Self Heating written by Daniel Marple and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
The integration of lithium ion batteries into the electric vehicle market is dependent on a few key issues. Two of these issues include cycle life and performance at low temperatures. Industrial lithium-ion batteries need to be able to withstand several thousand cycles and operate over a large temperature range so as not to induce range anxiety in drivers in colder climates. One of the major degradation mechanisms that can occur within a battery, especially in cold temperatures, is lithium plating on the graphite anode. Experiments in this dissertation show that the degradation mechanism of LiNi0.6Mn0.2Co0.2O2/graphite high energy cells that causes a premature death is lithium plating.Experiments utilizing specially fabricated research-type cells with forced lithium plating are used to better understand the important variables that drive lithium plating in graphite anodes. Results show that temperature plays a dominant role in the onset of lithium plating, which can even occur at temperatures above 0 oC. In order to mitigate lithium plating in Li-ion batteries, the internal temperature of the battery must be monitored and controlled. This can be obtained through self-heating quickly and efficiently while using a minimal amount of energy. Pulse heating of batteries from 0 oC is examined in order to decrease spatial temperature gradients, lower average activation current and minimize wasted energy due to temperature overshoot when compared to the current continuous heating protocol. The optimal pulse heating protocol is a 2 second on-pulse followed by a 2 second off-pulse. Mitigation of lithium plating in industrial electric vehicle batteries is attempted utilizing the self-heating technology. External heating is unable to heat the battery from sub-zero temperatures while inducing a safety shut-off and large spatial temperature gradients. Conversely, internal heating is successful at heating the cell quickly and uniformly with minimal energy consumed.
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.
Understanding Degradation And Lithium Diffusion In Lithium Ion Battery Electrodes
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Author : Juchuan Li
language : en
Publisher:
Release Date : 2012
Understanding Degradation And Lithium Diffusion In Lithium Ion Battery Electrodes written by Juchuan Li and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Mechanisms And Consequences Of Sei Failure In Advanced Li Ion Batteries
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Author : Oliver C. Harris
language : en
Publisher:
Release Date : 2020
Mechanisms And Consequences Of Sei Failure In Advanced Li Ion Batteries written by Oliver C. Harris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with Chemical engineering categories.
Accelerated capacity fade in high-voltage Li-ion batteries is attributed to crosstalk between the positive and negative electrodes causing parasitic reactions. Specifically, the concomitant electrolyte oxidation and transition metal dissolution (Mn, Ni and Co) from positive electrode active materials has been linked to capacity fade by disrupting the performance of the solid-electrolyte interphase (SEI). In full-cell studies, the effects of electrolyte decomposition and metal dissolution on battery lifetime and coulombic efficiency are well-documented, however the precise nature of crosstalk species and the mechanisms of capacity fade remain to be understood. Fundamental understanding of the role of each metal in undermining SEI passivation is necessary to mitigate this degradation and to enable commercialization of high-energy Li-ion batteries. Here we present methods to detect and quantify the effects of electrode crosstalk using model battery systems. In one part of our work, we interrogate the effects of three dissolved transition metals (Mn, Ni, and Co) on charge-transfer through the SEI via an in-situ electrochemical characterization technique. We find that Mn-contamination is the most detrimental of the three metals, agreeing with the consensus in literature. In order to better understand why Mn is exceptional, we develop microkinetic models of charge-transfer mechanisms based on electron tunneling across the SEI and electrocatalytic metal cycling between redox states. Comparing experimental data to models of each mechanism indicates that reaction thermodynamics do not fully capture why Mn facilitates faster through-film charge-transfer than Ni or Co, but rather a mechanism based on faster metal reduction kinetics is the salient explanation of enhanced SEI degradation by Mn. Next, we develop a generator-collector approach to understanding battery crosstalk. Rotating-ring disk electrode (RRDE) voltammetry is employed to study the effects of metal dissolution from LNMO (LiNi0.5Mn1.5O4) on SEI performance. The effects of metal contamination on SEI passivation are characterized via our redox mediator method and quantified using finite element simulations. We find that metal dissolution has a more profound impact on electronic than morphological SEI properties. Interpreting these results with physics-based models of SEI passivation imply that the inorganic layer is critical to passivation, while organic layers are inert at best. Lastly, we consider ongoing experiments and recent literature reports to rationalize a critical path forward for understanding and preventing metal contamination of the SEI.
Understanding Degradation In Lithium Ion And Lithium Air Batteries
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Author : Rory McNulty
language : en
Publisher:
Release Date : 2023
Understanding Degradation In Lithium Ion And Lithium Air Batteries written by Rory McNulty and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Understanding And Preventing The Degradation Of Silicon As A Lithium Ion Battery Anode
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Author : Nis-Julian Hendrik Kneusels
language : en
Publisher:
Release Date : 2020
Understanding And Preventing The Degradation Of Silicon As A Lithium Ion Battery Anode written by Nis-Julian Hendrik Kneusels 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.