Study of lithium deposition and applicability of solid polymer electrolytes in lithium cells
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Beschreibung
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.
Autor*in
Sanaz Momeni Boroujeni
Themen in »Study of lithium deposition and applicability of solid polymer electrolytes in lithium cells«
Lithium plating, Lithium (Li), Lithium deposition Solid polymer electrolyte (SPE) Lithium battery (LB), Kinetic balancing Kinetic properties of cell components Li-ion battery (LIB), Li metal battery (LMB), state-of-the-art LIB charge transport regions charge transfer process Li-based transport mechanisms pseudo-two-dimensional (P2D) cell model Solid Electrolyte Interphase (SEI) Anode’s aging mechanisms, Nernst-Einstein relation Lithium metal anode, Graphite anode NMC cathode, LiTFSI Salt LiFSI Salt Ether-based liquid electrolyte, Coulombic efficiency