3results about How to "Improve polarization" patented technology

This invention provides a cathode material, its preparation method, and a lithium-ion battery. The preparation method includes: (1) mixing an organic ligand, a magnesium source, and a solvent, and reacting to obtain a magnesium-based MOF; wherein the molar ratio of the organic ligand to the magnesium source is (1.8-2.3):1; (2) mixing carbon-coated lithium vanadium oxyphosphate, a solvent, and the magnesium-based MOF, and sintering to obtain the cathode material. In the preparation method of this invention, a carbon layer and a magnesium-based MOF layer are sequentially coated on the surface of lithium vanadium oxyphosphate, which can effectively reduce the contact between the cathode material and the electrolyte, suppress its side reactions with the electrolyte, and improve the cycle stability of the material; and can improve the surface porosity, ionic conductivity, electronic conductivity, and Li-ion battery of the material. + The insertion and extraction speed is increased, thereby improving the polarization phenomenon at high magnification and effectively enhancing the rate performance of the material.

The present application provides a polarizing film, which has transparent protective films attached to both sides of a polarizing film, the polarizing film being formed by adsorbing iodine to a polyvinyl alcohol-based film and orienting it, and having an iodine concentration of 6% by weight or more, and the moisture permeability of at least one of the transparent protective films being 200 g / (m 2 24h) or less, the polarizing film satisfying the condition that the change amount (ΔTs) of the monomer transmittance represented by the general formula (1): ΔTs(%) = Ts 750 Ts0 is 0% or more and 5% or less. The initial degree of polarization of this polarizing film is good, and the effects of suppressing the decrease in monomer transmittance due to the coloring of the polarizing film in a high-temperature environment are also excellent, and furthermore, the effects of suppressing the decrease in the degree of polarization in a high-temperature high-humidity environment (moisture resistance) are excellent.

The present application provides a polarizing film, which is formed by adsorbing iodine to a polyvinyl alcohol-based film and orienting it, has an iodine concentration of 3% by weight or more and 10% by weight or less, and in a produced gas analysis method, the peak temperature of the maximum intensity of water detected in the presence of an inert gas at a temperature increase rate of 10°C / min and a temperature increase range of 40°C to 350°C is 205°C or higher. The polarizing film has a good initial degree of polarization, and is also excellent in the effect of suppressing a decrease in monomer transmittance caused by coloring of the polarizing film in a high-temperature environment.