Wide-temperature self-healing electrolyte, preparation method thereof and lithium battery

Abstract

The invention provides a wide-temperature self-healing electrolyte, a preparation method thereof and a lithium battery. The wide-temperature self-healing electrolyte is of a three-dimensional cross-linked network structure composed of a glycerin chain segment, an isocyanate-terminated polyether polyol chain segment and a chain segment at least containing two terminal hydroxyl groups and a disulfide bond. A large number of repeated disulfide bond groups and self-complementary hydrogen bond structures are introduced into electrolyte substrate material molecules containing self-complementary hydrogen bond structures, so that a three-dimensional cross-linked network structure is formed, and cross-scale (molecular scale, micron scale and macro scale) damage perception response of the electrolyte and rapid self-healing of the material are realized by utilizing an intermolecular exchange reaction of disulfide bonds, so that a multi-layer (molecule-component-device-system) self-healing repair function is further achieved. The wide-temperature self-healing electrolyte has high elastic modulus and excellent electrochemical performance, and can be used as a solid electrolyte of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of electrolyte materials, in particular to a wide-temperature self-healing electrolyte, a preparation method thereof, and a lithium battery. Background technique [0002] Electrolyte is one of the key materials of lithium-ion batteries, which is placed between the positive and negative electrodes of the battery to transfer charges. Although lithium-ion batteries have been widely used in people's daily life, most of the electrolytes used are traditional flammable organic liquids, which pose a huge safety hazard during repeated charging and discharging. In order to improve the safety performance of lithium-ion batteries, replacing liquid electrolytes with more reliable all-solid electrolytes has become an important choice to solve this problem. Solid electrolytes without organic solvents can greatly improve the safety performance of lithium batteries, and have been widely concerned by researchers. Wide-tempe...

AI Technical Summary

Problems solved by technology

The inorganic solid electrolyte can maintain chemical stability in a wide temperature range, and has better mechanical strength and higher ionic conductivity at room temperature. challenge

For polymer electrolyte materials, slight damage mainly affects the interface contact between the electrolyte and the pole piece, resulting in a sharp increase in interface impedance, which in turn leads to a significant decrease in device rate and cycle performance, and a sharp decrease in capacity; moderate damage and missing damage not only deteriorate the interface Compatibility may also cause micro-short circuit inside the device, and even cause water and oxygen to enter the device, reducing the service capability

Images