Ionogels for sodium rechargeable batteries

Laburpena

In chapter 1, a brief introduction to the history of the batteries is presented. The most advanced battery technologies like lithium-ion and sodium-ion batteries are described and the need of suitable and safer electrolyte materials. Among actual electrolytes, we focused in ionogels, their characteristics and different preparation methods, as it will be the main topic of this thesis. In chapter 2, we show the synthesis and characterization of an ionogel membrane based on the poly(dimethyldiallylammonium) polyDADMA-TFSI poly(ionic liquid), N-Propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) and sodium bis (fluorosulfonyl)imide (NaFSI) the salt. Several parameters are measured like ionic conductivity, transference number or electrochemical window. Finally, the electrochemical performance of the optimum composition ionogel is evaluated in sodium all solid-state battery using sodium metal anode and NaFePO4 as the cathode material. In chapter 3, we described the synthesis and characterization of different new ABA triblock copolymer based on polystyrene and and poly(dimethyldiallylammonium) (PDADMA-TFSI). The block copolymer show excellent ionic liquid retention and some ionogel membranes are elaborated with them. In chapter 4, A simple method to prepare a mechanically robust ionogel film by fast (<1 min) UV photopolymerization The block copolymer show excellent ionic liquid retention and some ionogel membranes are elaborated with them. In chapter 4, A simple method to prepare a mechanically robust ionogel film by fast (<1 min) UV photopolymerization of poly(ethylenglycol diacrylate) in the presence of an ionic liquid electrolyte (ILE) based on N-Propyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI) IL and sodium bis (fluorosulfonyl)imide (NaFSI) salt is demonstrated. In chapter 5, materials synthesized in chapter 2, 3 and 4 are summarized and compared. Finally, the most relevant conclusions of this thesis are summarized.