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  1. NTU Theses and Dissertations Repository
  2. 工學院
  3. 應用力學研究所
請用此 Handle URI 來引用此文件: http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90554
完整後設資料紀錄
DC 欄位值語言
dc.contributor.advisor陳志鴻zh_TW
dc.contributor.advisorChih-Hung Chenen
dc.contributor.author戴承寧zh_TW
dc.contributor.authorChen-Ning Taien
dc.date.accessioned2023-10-03T16:36:33Z-
dc.date.available2023-11-09-
dc.date.copyright2023-10-03-
dc.date.issued2023-
dc.date.submitted2023-08-04-
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dc.identifier.urihttp://tdr.lib.ntu.edu.tw/jspui/handle/123456789/90554-
dc.description.abstract一直以來,鋰金屬電池被認為是高能量密度之可充電電池的候選之一。然而,負極/電解質界面的不穩定反應導致鋰金屬電池在充電過程中無法避免形成鋰枝晶(dendrites)。近來,高濃度電解質(highly concentrated electrolytes, HCEs)因其在沉積過程中能減輕負極表面鋰離子消耗進而抑制鋰枝晶生長而引起了人們的關注。然而因其傳輸性質與濃度高度相依,對枝晶形成的影響仍在研究中。

本研究使用穩態濃差極化(steady-state concentration polarization)的數學模型以及一系列相場(phase-field)模擬之動態分析,研究了HCEs中濃度相依的傳輸性質對鋰枝晶形成的影響。經由穩態分析給出了HCEs在長期沉積過程中電解液濃度的分佈,並透過在模型中引入參數β以量化濃度對擴散係數的相依性,我們解得考慮濃度相依性擴散係數的濃度分佈和極限電流密度(limiting current density)的解析解,並進一步指出極限電流密度和Sand的解析解的偏差是β和初始濃度C0的函數。此外,數值模擬表明,無因次參數βC0較大時在電極附近的濃度下降有初始和緩、隨後急劇下降的趨勢,最終在較短的時間內逼近最終值。最後,以相場模擬不均勻的負極表面上的沉積趨勢,證實本研究所推導的極限電流密度是不均勻沉積的關鍵指標。我們相信這項研究為理解HCEs的行為提供了新想法,並且為未來相關的鋰枝晶形成的研究提供一些靈感。
zh_TW
dc.description.abstractLithium metal batteries (LMBs) have long been regarded as one of the promising candidates for high-energy-density rechargeable batteries. However, the unstable reaction at the anode/electrolyte interface results in Li-dendrite formation in LMBs during the charging process. Recently, highly concentrated electrolytes (HCEs) have garnered attention in LMBs due to their ability to mitigate lithium-ion depletion at the anode surface during the deposition process and thus inhibit dendrite formation. However, the transport properties of HCEs are highly concentration-dependent. The exact influence on dendrite formation is still under investigation.

This study investigates the influence of the concentration-dependent transport properties in HCEs on the formation of Li-dendrite using a mathematical model of steady-state concentration polarization along with a series of phase-field simulations for dynamic analysis. Steady-state analysis reveals the variations in the electrolyte profile during the long-term deposition. Via the mathematical model with the introduction of a parameter β to quantify the dependence of concentration on diffusivity, an analytical solution for the concentration profile and limiting current density considering the concentration-dependent diffusivity is obtained. We further indicate that the deviation of limiting current density and Sand's solution is a function of β and C0. Moreover, numerical simulations reveal that the concentration near the electrode for higher dimensionless βC0 exhibits a gentler initial decrease followed by a steeper drop, ultimately reaching the final value in a shorter time. Finally, the phase-field simulation of the deposition trend on the non-homogeneous anode geometry confirms that the limiting current density derived in this study is a key indicator of non-uniform deposition. We believe that this study presents a methodology for comprehending the electrolyte behavior of HCEs and may offer inspiration for future investigations in Li-dendrite formation.
en
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dc.description.tableofcontents誌謝 i
摘要 ii
Abstract iii
Contents v
List of Figures viii
List of Tables xii

Chapter 1 Introduction 1
1.1 From Li-Ion Batteries to Li-Metal Batteries 1
1.2 Challenges of Li-Metal Batteries: Dendrite Formation 2
1.3 Crucial Role of Electrolyte Transport Properties in Dendrite Formation 3
1.4 Advantages of HCEs for Li-Metal Batteries 4
1.5 Thesis Structure 5

Chapter 2 Theory and Literature Review 7
2.1 Phase-Field Model 7
2.1.1 Ginzburg-Landau Free Energy 8
2.1.2 Evolution of Conservative Field & Non-Conservative Field 9
2.1.3 One-Dimensional Steady-State Solution of Allen-Cahn Equation 9
2.1.4 Allen-Cahn Equation of Lithium Deposition 10
2.1.5 Butler-Volmer Equation 13
2.2 Literature Review of Li-Deposition Models 14

Chapter 3 Methodology 17
3.1 Structure 17
3.1.1 Butler–Volmer Equation 17
3.1.2 Ionic Migration and Diffusion Equations 18
3.2 Non-Homogeneous Diffusivity 19
3.3 Non-Dimensionalization of Governing Equations 20
3.4 Modeling 22
3.4.1 Governing Equations 22
3.4.2 Successive Over-Relaxation (SOR) 23
3.4.3 Compute Unified Device Architecture (CUDA) 24
3.4.4 Flow Chart 26
3.4.5 Initial & Boundary Conditions 27
3.4.6 Simulation Parameters 27

Chapter 4 Results and Discussion 29
4.1 Characteristic Diffusivities 29
4.2 Steady-State Ion Concentration Polarization 30
4.3 Simulation Results 34
4.3.1 Model Validation 34
4.3.2 Simulation of The Transient State 36
4.3.3 Reliability of Steady-State Analysis 38
4.3.4 Non-Homogeneous Anode Geometry 40

Chapter 5 Conclusion & Future Work 43
5.1 Conclusion 43
5.2 Future Work 44

References 46
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dc.language.isoen-
dc.subject相場法zh_TW
dc.subject鋰金屬電池zh_TW
dc.subject高濃度電解液zh_TW
dc.subject質傳zh_TW
dc.subject鋰離子耗盡zh_TW
dc.subject極限電流密度zh_TW
dc.subjecthighly concentrated electrolytesen
dc.subjectlithium metal batteriesen
dc.subjectphase-field methoden
dc.subjectlimiting current densityen
dc.subjectdepletion of lithium ionsen
dc.subjectmass-transferen
dc.title高濃度電解質的傳輸性質對於鋰枝晶生長之影響zh_TW
dc.titleInfluence of Transport Properties of Highly Concentrated Electrolytes on Li-Dendrite Growthen
dc.typeThesis-
dc.date.schoolyear111-2-
dc.description.degree碩士-
dc.contributor.coadvisor陳國慶zh_TW
dc.contributor.coadvisorKuo-Ching Chenen
dc.contributor.oralexamcommittee舒貽忠;周鼎贏;林祺皓zh_TW
dc.contributor.oralexamcommitteeYi-Chung Shu;Dean Chou;Chi-Hao Linen
dc.subject.keyword鋰金屬電池,高濃度電解液,質傳,鋰離子耗盡,極限電流密度,相場法,zh_TW
dc.subject.keywordlithium metal batteries,highly concentrated electrolytes,mass-transfer,depletion of lithium ions,limiting current density,phase-field method,en
dc.relation.page53-
dc.identifier.doi10.6342/NTU202302875-
dc.rights.note同意授權(全球公開)-
dc.date.accepted2023-08-08-
dc.contributor.author-college工學院-
dc.contributor.author-dept應用力學研究所-
dc.date.embargo-lift2026-07-31-
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