| abstract |
A method for preparing a flame retardant gel electrolyte, comprising the following steps: using anhydrous tetrahydrofuran as a solvent, reacting trifluoroethanol and diethylene glycol monovinyl ether with sodium hydride, respectively, to prepare sodium trifluoroethoxide and 2- [2-(ethyleneoxy)ethoxy]sodium ethoxide. Then, two kinds of sodium alkoxides were reacted with hexachlorocyclotriphosphazene successively under ice bath condition to prepare cyclophosphazene monomer TFV containing multiple carbon-carbon double bond functional groups. Then TFV was mixed with butyl acrylate, initiator, and electrolyte and injected into the coin cell, and after thermal initiation, an in-situ battery with gel electrolyte was obtained. Among them, the prepared gel electrolyte is rich in phosphorus, nitrogen and fluorine elements, which endow it with good flame retardant properties. This in-situ polymerization method avoids the use of a large amount of solvent and pollution to the environment, and achieves good contact between the electrolyte and the electrode. |