Preparation method of cyclic ether phosphazene polymer electrolyte membrane with excellent membrane forming performance

Abstract

The invention discloses a preparation method of a cyclic ether phosphazene polymer electrolyte membrane with excellent membrane forming performance. The method comprises steps of introducing epoxy ether and alkoxy ether side groups for equal-proportion mixing substitution to synthesize the novel cyclic ether phosphazene polymer; and preparing a polymer electrolyte membrane by a solution casting method; according to the scheme, the preparation method comprises the following steps: introducing glycidyl alcohol into polyphosphazene by taking triethylamine as an acid-binding agent, reacting diethylene glycol monomethyl ether with NaH to prepare sodium alcoholate, introducing the sodium alcoholate into polyphosphazene as a nucleophilic reagent, and reacting to prepare the novel cyclic ether phosphazene polymer; the preparation method of the phosphazene polymer electrolyte membrane comprises the following steps: uniformly mixing lithium salt, novel cyclic ether polyphosphazene and solvent water at 60 DEG C, and preparing the membrane by adopting a solution casting method.

Description

Technical field: [0001] The invention prepares a cyclic ether phosphazene polymer electrolyte membrane, and the phosphazene polymer electrolyte membrane can obtain a film with good film-forming performance without cross-linking. Background technique: [0002] With the continuous advancement of science and technology, people pay more and more attention to the safety of energy. As an important energy source, lithium-ion batteries have attracted great attention. Since their commercialization in 1991, lithium-ion batteries have Batteries have been widely used in various fields such as mobile phones and other small devices and electric vehicles. At present, because lithium-ion batteries mostly use highly flammable carbonate-based liquid organic electrolytes, their flammable characteristics seriously hinder the development of lithium-ion batteries. With the development of technology, the emergence of polymer electrolytes not only avoids the disadvantages of liquid electrolytes suc...

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Problems solved by technology

Therefore, the research on phosphazene polymer electrolytes has been paid more and more attention. In 1984, Allcock reported the first polyphosphazene electrolyte containing ether side groups, polybis(diethylene glycol monomethyl ether) phosphazene (MEEP), which passed Combining with lithium salt has the ability to conduct electricity, but its mechanical stability is poor, and ultraviolet crosslinking is required to obtain a dimensionally stable film

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