Study of lithium deposition and applicability of solid polymer electrolytes in lithium cells

Momeni Boroujeni, Sanaz

• Publisher: Cuvillier Verlag
• Year: 2022
• eBook ISBN:
  9783736967090
• Print ISBN:
  9783736977099
• Edition: 1

Lithium (Li) deposition is a problem in Li batteries (LB) - both Li metal (LMB) and Li-ion (LIB) batteries - which limits their performance in terms of power and energy density. Two trends can be identified in the advancement of LBs concerning the problem of Li deposition: optimization of the existing system (the state-of-the-art LIBs) and further development of cell components such as electrolytes. This work addresses both approaches.In the first part, this study investigates Li deposition in LMB and LIBs. A novel method to study the Li-based transport mechanisms in LIBs is introduced. Later the kinetic deviations between anode and cathode as a consequence of aging and the relation of these deviations to the occurrence of Li-plating are discussed.In the second part, the applicability of PEO-based solid polymer electrolytes for LMBs to overcome the Li plating issue is investigated. The introduction of various interfacial interlayers at the cathode/electrolyte interphase was studied to improve the electrochemical stability of the cells. Cells with an in-situ electro-deposited interlayer showed the best cyclability.

Table of contents

• Zusammenfassung
• Abstract
• Chapter 1 Introduction
• 1.1 Motivation
• 1.2 Structure of this work
• Chapter 2 Theoretical and experimentalbackground
• 2.1 Electrochemical cells
• 2.2 Lithium ion battery
• 2.3 Lithium metal battery
• 2.4 Solid polymer electrolytes
• 2.5 Instrumentation and techniques
• Chapter 3 Lithium deposition in Li-ion andLi-metal cells
• 3.1 Kinetics study to predict Li plating in a Li-ioncell
• 3.2 Inuence of temperature and electrolyte onLi deposition
• Chapter 4 Solid polymer electrolytes
• 4.1 Manufacturing of the PEO solid electrolyte
• 4.2 Manufacturing of the cathode
• 4.3 Passivation layers
• 4.4 Cell assembly
• 4.5 Electro and physiochemical characterization
• Chapter 5 Result and discussion on lithiumdeposition study in Li-ion andLi-metal cells
• 5.1 Kinetics study to predict Li plating
• 5.2 Inuence of temperature and electrolyte onLi deposition
• Chapter 6 Investigation on PEO-based SPEs
• 6.1 PEO/LiTFSI membranes
• 6.2 PEO/LiTFSI/passive-ceramics membranes
• 6.3 Stability versus NMC cathode
• 6.4 Coulombic effciency
• 6.5 Discussion and conclusion
• Chapter 7 Conclusion
• List of Tables
• List of Figures
• Bibliography
• Publications
• Aknowledgment