Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.309
Publication date: 16th December 2024
The role of binders is crucial to achieve high performance and long cycle lifes in next generation electrodes for lithium batteries. Poly(vinylidene difluoride) (PVDF) and its copolymers are the most commonly used binders for the processing of cathodes in Li-ion batteries, due to their good electrochemical stability. However, PVDF requires the usage of toxic and expensive organic solvent N-methyl-2-pyrrolidone (NMP) for the electrode processing and elevated temperatures for drying step, making the cathode manufacturing process environmentally unfriendly. In order to overcome these issues, it is necessary to develop cost effective and eco-friendly binders as alternatives to PVDF.
For this reason, the use of bio-polymers and water-processable polymeric binders is increasingly investigated. In this talk, we will present the development of water processable polymeric binders, such as carrageenan biopolymers [1] and fluorine-free poly(ionic liquids) [2], together with their application as binder in high-voltage NMC811 cathodes. Moreover, polymer binders that can provide additional functionalities, such as lithium mobility and/or electronic conductivity, are important for both lithium-ion and lithium-metal batteries. Here, organic mixed ionic-electronic conducting (OMIEC) binders will be presented based on the conducting polymer PEDOT and ionically conductive poly(ionic liquids) [3] and organic ionic plastic crystals [4], which improve the rate capability and cycling stability of Li-ion batteries.
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