Special high temperature resistant binder for lithium batteries and preparation method of special high temperature resistant binder

Abstract

The invention relates to a special high temperature resistant binder for lithium batteries and a preparation method of the special high temperature resistant binder, and belongs to the technical fieldof lithium batteries. The preparation method comprises the following steps: adding zirconium oxide into an oxidized graphene nanosheet aqueous dispersion, mechanically stirring and uniformly mixing to obtain a mixed solution; adopting a spraying method to spray the mixed solution into liquid nitrogen dispersed with GeSbTe phase-change powder, freezing into microspheres, and drying to obtain compound microspheres; and mixing the compound microspheres, resin, an inorganic filler, a modifier and a diluent to obtain the special high temperature resistant binder for lithium batteries. The binder comprises compound microspheres containing zirconium oxide and oxidized graphene wrapped GeSbTe phase-change powder, the compound microspheres are high in electrical conductivity, thermal shock can beovercome, and after the binder is used for binding electrodes of the lithium batteries, the attenuation of the batteries and the reduction of cycle performance caused by thermal impact are effectivelyrelieved. When the temperature of the batteries is high, the volume cracking, caused by high temperature, of the electrodes is effectively relieved through crystal transfer stress.

Description

Technical field [0001] The invention relates to a high temperature resistant binder special for lithium batteries and a preparation method thereof, and belongs to the technical field of lithium batteries. Background technique [0002] Lithium-ion battery is currently one of the most extensively studied energy storage devices. Because of its high capacity density, high cycle life, environmental protection, wide operating temperature range and high safety performance, it is used in portable electronic equipment, electric vehicles, Widely used in energy storage and other fields. [0003] Lithium-ion batteries are mainly composed of a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. Its working principle is to store and release electrical energy through the redox reaction of reversible insertion / deintercalation of lithium ions in the electrode active material. The method for preparing the positive and negative electrodes of lithium ion batteries is ...

AI Technical Summary

Problems solved by technology

[0007] In summary, although the existing organic binders have high bonding strength, they have poor high temperature resistance, low bonding strength at high temperatures and other defects, and the organic components are harmful to the human body and the environment.

Ordinary inorganic binders not only have low bonding strength, but also require high curing temperature and long curing time, and the thermal cycle performance is poor under the condition of rapid cooling from high temperature to room temperature.