A kind of gel electrolyte with honeycomb network structure and preparation method thereof

Abstract

The invention discloses gel electrolyte with a cellular network structure and a preparation method thereof. The gel electrolyte is prepared by the following steps of: carrying out network crosslinking on polymethyl methacrylate, polyvinyl ethylene glycol dimethacrylate and polyvinylidene fluoride hexafluoropropylene, forming an internal cellular structure by utilizing a hot-pressing mold, and then filling pores of the cellular structure with a proper amount of nano titanium dioxide. The gel electrolyte and the preparation method disclosed by the invention have the advantages that the dynamic permeation effect can be well improved; due to the effect, the diffusion rate of Li<+> is increased and the effect of electrolyte is improved; the inorganic fillers are added in the cellular structure to form a micro-porous structure, so that the compatibility and the stability are good, the mechanical performance is excellent, the interface stability is good, and the cationic transference number is large; the gel electrolyte can be well and fully contacted with an electrode, and inorganic particles also can absorb impurities in the gel electrolyte, so that the water-retaining capability of the system is improved, a plasticizing agent and the impurities are prevented from transferring to the electrode and the interface stability between the polymeric electrolyte and the electrode is improved.

Description

Technical field [0001] The invention belongs to the technical field of polymer electrolytes, and in particular relates to a gel electrolyte with a honeycomb network structure and a preparation method thereof. Background technique [0002] The polymer electrolyte can solve the leakage risk of the liquid electrolyte lithium-ion battery and make it arbitrarily shaped, which has been extensively studied. Among them, the all-solid polymer electrolyte has too low room temperature ionic conductivity, which temporarily cannot meet the application requirements of the battery, and only the gel electrolyte has been industrially applied. Compared with pure solid polymer electrolytes, gel polymer electrolytes have higher ionic conductivity at room temperature. Due to the addition of plasticizers, the compatibility and stability of the components are poor, the mechanical properties are poor, the interface stability is poor, and the number of cation migration is low, and it is difficult to ful...

AI Technical Summary

Problems solved by technology

Although there have been various electrolytes with interconnected gel structures, their overall performance is still not perfect, and the structure and manufacturing methods of gel electrolytes still need to be improved in order to improve the overall performance of the electrolyte and improve the service life of the battery.