Preparation method of high-temperature safe nanocomposite conductive ionic glue

Abstract

The invention discloses a preparation method of high-temperature safe nanocomposite conductive ionic glue. The method comprises the steps that a polymeric matrix is dissolved into an organic solvent which contains ionic liquid, an SiO2 or TiO2 nano particle precursor and lithium salt to form a transparent viscous polymer solution, i.e. a casting film liquid; water which is 1-3 times of the mole number of the SiO2 or TiO2 nano particle precursor is added into the casting film liquid to react at room temperature for 5-15h, so as to generate SiO2 or TiO2 nano particles and the SiO2 or TiO2 nano particles are filled into the polymeric matrix in situ; and the casting film liquid is poured into a plate basal body with grooves and leveled by using a scraping blade, and the plate basal body is put into a drying oven to be dried at constant temperature so as to remove small molecule compounds which are generated after the decomposition of the organic solvent, H2O and the SiO2 or TiO2 nano particle precursor, and thus the porous nanocomposite conductive ionic glue is formed. The prepared nanocomposite conductive ionic glue has excellent stability, high temperature resistance, high ionic conductivity and high mechanical strength. The nanocomposite conductive ionic glue can be applied to lithium secondary batteries and the like.

Description

technical field [0001] The invention belongs to the field of polymer lithium secondary batteries, and relates to a preparation method of a high-temperature-resistant nanocomposite gel polymer electrolyte. Background technique [0002] Lithium is the lightest metal element on earth (0.534g / cm 3 ), the lowest hydrogen standard reduction electrode potential (-3.04V) and extremely high theoretical specific capacity (3860mAh / g), the lithium secondary battery assembled with it as the negative electrode has high unit operating voltage, high energy density and long cycle life And environmental friendliness, become the preferred chemical power source for electric vehicles. However, the formation of lithium dendrites and the carbonate electrolyte solution used in the charge and discharge process have become a safety hazard in the use of lithium secondary batteries. Lithium crystal dendrites may pierce the separator and cause a short circuit inside the battery, resulting in a sudden ...

AI Technical Summary

Problems solved by technology

At present, the conductive ion glue used in lithium-ion batteries either has good mechanical properties and low conductivity, or the ion glue with high ion conductivity has poor mechanical strength. Therefore, how to ensure that the conductive ion glue has good mechanical strength and good mechanical strength. It has high ionic conductivity, which is the key to the preparation of high-temperature safe conductive ionic glue

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