Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/212714
Title: THE DEVELOPMENT OF ORGANIC REDOX-ACTIVE MATERIALS FOR BATTERIES
Authors: WANG, XIAOWEI
ORCID iD:   orcid.org/0000-0002-7542-6108
Keywords: organic redox-active materials, redox flow battery, molecular engineering, dense-stacking polymer, Aqueous metal ion battery, Li-S battery
Issue Date: 20-Jan-2021
Citation: WANG, XIAOWEI (2021-01-20). THE DEVELOPMENT OF ORGANIC REDOX-ACTIVE MATERIALS FOR BATTERIES. ScholarBank@NUS Repository.
Abstract: Organic redox-active materials (ORMs) are attractive for batteries due to their high specific capacity, sustainability, eco-friendliness and good affordability. However, their electrochemical performances are hampered by their low electrical conductivity, low bulk density and low electrode stability. In this thesis, we have developed molecularly engineered triphenylamine (TPA) derivatives for applications in aqueous redox flow battery. Dense-stacking Hexaazatrinaphthylene (HATN) polymer with good electrical conductivity was prepared by melt-polymerization. We demonstrate that HATN can be a versatile high-energy electrode for aqueous low-cost metal ion batteries. Considering that HATN polymer presents high surface for sulfur host as well as high bulk density needed to fabricate electrodes with high tap density, we have investigated the performance of HATN/sulfur as cathode in Li-S batteries. The redox capability of bulky HATN polymer enables controllable polysulfide deposition with fast redox kinetics in lithium-sulfur battery, and the excellent material scalability was validated by attaining high-energy lithium-sulfur pouch cells.
URI: https://scholarbank.nus.edu.sg/handle/10635/212714
Appears in Collections:Ph.D Theses (Restricted)

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