Composite gel polymer electrolyte preparation method and lithium ion battery

Abstract

The invention discloses a composite gel polymer electrolyte preparation method and a lithium ion battery, wherein the preparation process of the composite gel polymer electrolyte comprises the steps of dissolution of a polymer, introduction of a cross-linking agent, dispersion of an inorganic filler, dissolution of a lithium salt, and slurry casting and film forming. By virtue of the prepared composite gel polymer electrolyte, the problems of relatively high solvent mobility and volatility, relatively poor electrochemical stability and the thermal stability, low ionic conductivity, low mechanical strength, poor electrolyte and electrode interface stability and the like of the traditional gel electrolyte are effectively improved; the composite gel polymer electrolyte has the advantages of high ionic conductivity at the room temperature, wide electrochemical voltage window, high mechanical performance and relatively high adhesion of the electrolyte to the positive electrode and the negative electrode, so that the safety performance and the electrochemical performance of the lithium ion battery are greatly improved; meanwhile, the preparation method is simple and rapid, and the cost is low; and the assembled lithium ion battery is light and thin in appearance and excellent in electrochemical performance, and has a very wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of polymer lithium ion batteries, and in particular relates to a preparation method of a composite gel polymer electrolyte and a lithium ion battery thereof. Background technique [0002] Since lithium-ion batteries have the advantages of high energy density, high output voltage, long cycle life, and low environmental pollution, since the industrialization of lithium-ion batteries in the 1990s, lithium-ion batteries have not only been used in portable electronic products and electric vehicles These fields have been widely researched and applied, and play an important role in promoting the adjustment of energy structure and the sustainable development of energy and environment. At present, lithium-ion batteries have become the standard power supply of mobile electronic devices such as mobile phones and notebook computers, and have been widely used in the fields of electric vehicles and hybrid electric vehicle...

AI Technical Summary

Problems solved by technology

Although the gel electrolyte membrane prepared by this method has a high voltage window (above 5.0 V), its room temperature ionic conductivity is low and its mechanical properties are poor, which makes the application of gel polymer electrolyte in lithium-ion batteries very limited. big limit

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