Polyoxometallic acid lithium salt ceramic membrane for lithium-ion battery

Abstract

The invention relates to a polyoxometallic acid lithium salt ceramic membrane for a lithium-ion battery and a preparation method, and belongs to the technical field of polymers and polymer composite materials and preparation methods. The targets are achieved as follows: ceramic powder containing a polyoxometallic acid lithium salt coats a base material, so that the safety of the ceramic membrane can be kept due to the presence of the ceramic powder; the lithium ion transmission rate is also improved by the polyoxometallic acid lithium salt; and the double characteristics of the safety and the transmissibility are met. The polyoxometallic acid lithium salt ceramic membrane for the lithium-ion battery contains the ceramic powder and the polyoxometallic acid lithium salt; and the ceramic powder is any one of AlO(OH), SiO2, TiO2, MgO, CaCO3 and BaSO4. The preparation method comprises the following steps of: (1) adding the ceramic powder, the polyoxometallic acid lithium salt and an adhesive to a solvent for stirring evenly and mixing the mixture into slurry; and (2) coating the surface of a polyolefin membrane base material with the slurry prepared in the step (1) and then drying the slurry.

Description

technical field [0001] The invention relates to a polymer and a polymer composite material and a preparation method, in particular to a diaphragm for a lithium ion battery and a preparation method. Background technique [0002] Lithium ions mainly rely on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] The positive electrode materials, negative electrode materials, separators and electrolyte materials required for the manufacture of lithium-ion batteries are called the four key materials of lithium-ion batteries. [0004] Among them, the main function of the separator is to separate the ...

AI Technical Summary

Problems solved by technology

[0036] Al 2 o 3 Ceramic powder, Al 2 o 3 Most of the particles are flat, and the particle size distribution is wide. In the ceramic coating on the surface of the base membrane, the large and small particles stack with each other to form a dense coating, which hinders the normal migration of lithium ions in the separator, and the ion conductivity is poor.

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