4 results about "Microporous membranes" patented technology

The invention relates to a capacitor of a lithium ion battery. The capacitor comprises a capacitor shell, an organic electrolyte arranged in the capacitor shell, a winding core formed by isolating a positive plate from a negative plate through an ion permeability microporous membrane and winding, wherein the positive plate and the negative plate are respectively connected with a positive lug and a negative lug and are led out by the positive lug and the negative lug to a positive end and a negative end of the capacitor shell. A negative active material comprises a material A and a material B, wherein the material A comprises at least one of hard carbon and soft carbon, the material B comprises at least one of natural graphite, modified graphite and synthetic graphite, the material A accounts for 50.0%-95.0% of the capacity percentage of the negative active material, and the material B accounts for 5.0%-50.0% of the capacity percentage of the negative active material. The capacitor has the high-energy density characteristic of the lithium ion battery and the high-power density characteristic of a double electric layer capacitor.

The invention relates to a method for preparing a high-temperature resistant microporous membrane. The method sequentially comprises the following steps: (A) mixing raw materials consisting of 20-55% (by weight) of resin mixture and 45-80% (by weight) of membrane forming solvent; (B) carrying out melt extrusion on the mixed raw materials, and cooling to form a sheet; (C) longitudinally and transversely stretching the sheet, so as to form a membrane; (D) extracting the membrane forming solvent from the membrane through an extraction solvent, so as to form a microporous membrane; (E) carrying out heat-setting on the microporous membrane formed in the step (D), wherein the resin mixture consists of the ingredients in percentage by weight: 2-10% of high-temperature resistant resin, 5-15% of polypropylene and 75-93% of polyethylene, the melting point of the high-temperature resistant resin is higher than 170 DEG C, and polyethylene with the molecular weight greater than 106 accounts for 10-30% the total weight of the polyethylene. The method for preparing the high-temperature resistant microporous membrane, disclosed by the invention, aims to provide the high-temperature resistant microporous membrane which is good in temperature resistance and relatively high in melting rupture temperature and better meets the use requirements of lithium battery diaphragms.

The invention relates to a method for preparing a high-performance hydrophilic modified polyacrylonitrile membrane by combining in-situ modification with a phase separation technology. The invention particularly relates to a preparation method for controlling pore size and separation performance of the polyacrylonitrile microporous membrane. The method comprises the following steps: performing in-situ reaction modification with phase inversion on polyacrylonitrile and an amino compound to form a film, wherein the chemical composition of the polymer and the performance of the membrane casting solution of the polymer can be changed by controlling the variety, the addition proportion and the reaction process parameters of the amino compound, and thereby diversified adjustment of the pore morphology, the structure, the surface composition and the separation performance of the membrane is realized, so that different application requirements are met. Compared with the prior art, the method has the advantages of simple and convenient preparation and excellent membrane performance, and can be applied to different separation occasions.