Porous composite material partition and preparation method thereof, composite-structure cell and lithium ion battery

Abstract

The invention discloses a porous composite material partition and a preparation method thereof, a composite-structure cell and a lithium ion battery. The partition comprises a high-temperature-resistant resin substrate, a flame retardant and inorganic high-temperature-resistant particles, wherein the high-temperature-resistant resin substrate is composed of any one or more of a polyamide resin, a polyethylene terephthalate resin, a polyamide resin, a polystyrene resin and a polysilane resin; the flame retardant accounts for 1-15 wt% of the high-temperature-resistant resin substrate; the inorganic high-temperature-resistant particles are at least one of Al2O3, TiO2, ZrO2 and SiO2; and the inorganic high-temperature-resistant particles account for 5-15 wt% of the high-temperature-resistant resin substrate. The porous composite material partition can resist the high temperature of more than 200 DEG C, and has the advantages of flame retardancy, high temperature resistance, corrosion resistance and impact resistance. The porous composite material partition is independently formed, does not need to be applied to a pole piece or diaphragm, can not influence the pole piece or diaphragm in the forming process, and ensures the self performance and service performance of the pole piece and diaphragm.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a porous composite material separator, and also relates to a preparation method of the porous composite material separator, a battery cell with a composite structure and a lithium ion battery using the separator. Background technique [0002] At present, lithium-ion batteries are accepted by people because of their environmental protection, higher rated voltage, higher energy storage and longer service life, gradually replacing nickel-cadmium batteries that have occupied the market for nearly a hundred years. However, lithium-ion batteries have disadvantages, such as poor safety, and may cause an explosion when heated, especially nickel-cobalt lithium manganese oxide batteries, which have poorer safety performance. [0003] A conventional lithium-ion battery consists of a positive electrode, a negative electrode, and a PE / PP separator. The PE / PP separato...

AI Technical Summary

Problems solved by technology

However, in the preparation process, the slurry needs to be prepared first, and then the slurry is coated on the diaphragm and then dried to form a coating. This process is easy to cause damage to the diaphragm itself, affecting the performance and usability of the diaphragm, and may cause safety problems such as short circuit. At the same time, its inorganic filler is a metal hydroxide that undergoes a dehydration reaction at a high temperature, and water will be released during battery use, which will have a negative impact on the performance of the non-aqueous electrolyte, which is not conducive to popularization and use.

Images