Synthesis and characterization of block copolymers for high-tech applications using RAFT polymerizatio

Block copolymers are of current interest in different fields due to their tailorable properties and ability to self-assemble. Replacing common polymers which show insufficient properties with block copolymers could lead to better performing materials. In this thesis, block copolymers of poly(acryl amide) derivatives are tested in the usage as cathode binders in lithium ion batteries and compared to the commonly used poly(vinylidene fluoride) binder. The tested block copolymer poly(11-acrylamidoundecanoate lithium salt - block - hydroxyethyl acrylamide) (poly(11-AAmUDA-­Li­-block-­HEAm)) is synthesized with reversible addition-­fragmentation chain transfer (RAFT) polymerization and subsequent saponification. Its polymerization showed better controllability by reaching the desired theoretical Mn as well as showing a small dispersity as compared to other block copolymers investigated. By investing its properties as a binder in cathode materials, a higher adhesive force than the industrially used binder and a statistical copolymer with the same monomers was proven. The block copolymer is also electrochemically stable in the battery operation range of up to 4.3 V vs. Li/Li+ and displays good coating ability of the active material. Poly(11-AAmUDA­-Li-­block-­HEAm) therefore shows all necessary properties needed for a binder and its usage in lithium ions can further be investigated in battery cells.