81results about How to "Excellent ion permeability" patented technology

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate and an adhesive layer that is formed on at least one side of the porous substrate and is an aggregate layer of particles that contain a polyvinylidene fluoride resin and have an average particle diameter of from 0.01 μm to 1 μm, in which a content of the particles per one adhesive layer is from 0.1 g/m² to 6.0 g/m2.

The invention relates to a reinforced nanofiber porous membrane and a preparation method thereof. The porous membrane is a two-component lithium ion battery diaphragm formed by compounding polymer resin with polyurethane, and has a semi-interpenetrating network structure, the porosity of 60 to 80 percent, and mechanical property which is 3 to 4 times higher than that of a polymer resin single-component porous membrane. The preparation method comprises the following steps of: preparing a polymer resin non-woven membrane by high-voltage electrostatic spinning, impregnating the non-woven membrane in solution of wet curing reaction polyurethane prepolymer with a high-reactivity isocyanate group, reacting -NCO in the polyurethane prepolymer with a -OH bond of water in air at room temperature to obtain the polyurethane through crosslinking and autopolymerization, so that nanofibers in the non-woven membrane are bonded to form a polymer resin and polyurethane two-component composite membrane, and the mechanical strength of the fiber membrane is greatly improved. The method is easy to operate, and the prepared non-woven membrane keeps the advantages of high porosity of a membrane prepared by an electrostatic spinning technology, and heat stability of the polymer resin, and has high ion permeability and affinity of electrolyte.

The invention relates to an enhanced bi-component nanofiber porous membrane and a preparation method thereof. The porous membrane is a lithium ion battery membrane with two components of polymer resin and polyurethane. The membrane is in a semi-interpenetrating network structure which has a void ratio of 60-80%, and the mechanical property is 2-3 times higher than a single-component porous membrane of polymer resin. The preparation method comprises the steps of: dissolving a polymer resin and polyurethane prepolymer bi-component composition in a solvent, and preparing a nonwoven membrane through an electrospinning technology; and putting the nonwoven membrane at room temperature to make -NCO in the polyurethane prepolymer react with the -OH bond of water in the air to produce polyurethanethrough crosslinking and autopolymerization. In the invention, the nanofiber in the nonwoven membrane binds to form the polymer resin and polyurethane bi-component compound membrane, and the mechanical strength of the fibrous membrane is improved greatly. The method is easy, and the prepared nonwoven membrane maintains the advantages of high void ratio, and good thermal stability of polymer resinof the membrane prepared by using the electrospinning technology, and the membrane has good ion permeability and electrolyte affinity.

A high-energy density lithium ion battery formation method includes the following steps: S1, after battery filling, the filling hole is sealed with sealing cotton, and standing lasts for 16-48h; S2, a battery is charged to 3.7 to 4.0V by a multiplying power of 0.01 to 0.02C; S3, the battery is charged to 4.0-4.35V by a multiplying power of 0.03 to 0.05C; S4, the battery is charged to 4.35 to 4.5V by a multiplying power of 0.1 to 0.2C, and then the battery is charged for 1 to 3h at a constant voltage of 4.35 to 4.5V; S5, the battery is subjected to high temperature aging and then is subjected to exhaust-gas disposal, and then secondary filling is performed according to the weight change of the battery to supplement electrolyte lost during formation and aging; S6, the battery is sealed. The high-energy density lithium ion battery formation method improves the first efficiency, safety performance and cycle performance of a rich lithium anode-carbon cathode system battery, avoids the flatulence problem during formation, and reduces the internal resistance of the battery.

The present invention provides a separator for a non-aqueous secondary battery including a porous substrate, and an adhesive porous layer that is formed at one or both sides of the porous substrate, contains (1) polyvinylidene fluoride resin A and (2) polyvinylidene fluoride resin B described below, and has a porosity of from 30% to 60% and an average pore size of from 20 nm to 100 nm:

• • (1) polyvinylidene fluoride resin A is selected from the group consisting of vinylidene fluoride homopolymers and DVF copolymers containing structural units derived from vinylidene fluoride (VDF) and structural units derived from hexafluoropropylene (HFP), a total content of structural unit derived from HFP in each of the VDF copolymers being 1.5 mol % or less of a total content of structural unit in each of the VDF copolymers; and
  • (2) polyvinylidene fluoride resin B selected from the group consisting of VDF copolymers containing a structural unit derived from VDF and a structural unit derived from hexafluoropropylene, a total content of structural unit derived from HFP in each of the VDF copolymers being greater than 1.5 mol % of a total content of structural unit in each of the VDF copolymers

The invention provides a composite isolation membrane and a formation method thereof, and the method comprises the following steps: transforming a SO2F group or a H-type sulfonic group in perfluorosulfonate resin into a SO3Li group to obtain a perfluorosulfonate ion exchange resin with a SO3Li functional group; dissolving the obtained perfluorosulfonate ion exchange resin in a solvent to obtain a resin solution; performing surface treatment of a polyolefin micropore diaphragm to obtain a treated micropore diaphragm; soaking the polyolefin micropore diaphragm after surface treatment in the resin solution, taking the diaphragm out and drying to obtain a composite isolation membrane. According to the invention, by combining the perfluorosulfonate ion exchange resin which has a Li ion exchange function after ion transformation with the polyolefin micropore diaphragm after surface treatment, the polyolefin micropore diaphragm is modified; because of the high thermal stability, hydrophilicity, and ion exchange capability of the perfluorosulfonate ion exchange resin, the liquid absorption capacity, heat resistance and ion penetration capability of the isolation membrane are increased.

A drift tube structure for ion mobility spectrometer is disclosed comprising electrode sheets and insulation parts arranged in alternation, with each electrode sheet being a mesh metal sheet having a radian or taper portion which is convexly curved toward an ion input. Further, the radian or taper portion of the electrode sheet has meshes of higher transparency. With the above structure of the present invention, an electric field having a periphery of uniform focusing center can be formed in the migration zone. The circular ring configuration of the electric field periphery can shield the migration electric field from any influence of external electric fields. The electrodes are each meshlike and have a circular hole at the center, thus they can focus and collect as many as possible ions that do not move along the central axis, and those ions moving along the central axis can pass through the electrodes transparently.

Disclosed is a composite porous membrane which can achieve both an excellent adhesiveness of a heat-resistant resin layer and a small rise in gas permeation resistance even in the case of further reducing the thickness of membranes to be used, for example, battery separators. Specifically disclosed is a composite porous membrane comprising a porous membrane (A) formed of a polyolefin-based resin and a porous membrane (B) containing a heat-resistant resin, said porous membrane (B) being laminated on said porous membrane (A), wherein said porous membrane (A) has a thickness being within a specific range, an average pore size being within a specific range and a porosity being within a specific range and the thickness of the entire composite porous membrane is within a specific range, characterized in that, in said composite porous membrane, the peel strength at the interface between the specific porous membrane (A) and porous membrane (B) is within a specific range and the difference between the gas permeation resistance of the entire composite porous membrane and the gas permeation resistance of the porous membrane (A) is also within a specific range.

It is intended to provide a reactive polymer-supported porous film that is capable of achieving sufficient adhesion between the electrode and the separator; reduced in internal resistance; and excellent in high rate characteristics, the porous film being useful as a battery separator which, after production of the battery, is not melted or broken under a high temperature and functions as a separator having a small heat shrinkage ratio as well as to provide a process for producing batteries using the reactive polymer-supported porous film. According to this invention, there is provided a reactive polymer-supported porous film for a battery separator, characterized in that the reactive polymer-supported porous film has: a substrate porous film of a porous film, the porous film has a temperature, at which a thickness of the porous film is reduced to 1/2 of a thickness when a prove is placed on the porous film in the case that the thickness of the porous film is measured by placing the probe having a diameter of 1 mm on the porous film under a load of 70 g and heating the porous film from a room temperature at a temperature-increase rate of 2 DEG C/minute, of 200 DEG C or more; and a reactive polymer supported on the substrate porous film, the reactive polymer is obtainable by reacting: a crosslinkable polymer obtainable by copolymerizing: a crosslinkable monomer having in a molecule at least one reactive group selected from a 3-oxetanyl group and an epoxy group; and a crosslinkable monomer having a reactive group capable of reacting with an isocyanate group; and a polyfunctional isocyanate to be partially crosslinked.

In an embodiment of the present disclosure, provided is a separator for a non-aqueous electrolyte battery, the separator being composed of a composite membrane comprising: a porous substrate; and an adhesive porous layer provided on one side or both sides of the porous substrate and containing an adhesive resin, wherein the adhesive porous layer further contains an acrylic resin in a state in which the acrylic resin is mixed with the adhesive resin, a peel strength between the porous substrate and the adhesive porous layer is 0.20 N/10 mm or more, and a Gurley value is 200 sec/100 cc or less.

The present invention relates to a composite diaphragm with a high conductivity material layer. The composite diaphragm comprises a composite diaphragm main body consisting of a polymer diaphragm andan inorganic nanometer material layer, the polymer diaphragm constructs the polymer diaphragm main body structure bearing and fixes the inorganic nanometer material layer, and the inorganic nanometermaterial layer coats one-side surface or two-sides surfaces of the polymer diaphragm. The preparation method of the composite diaphragm with the high conductivity material layer comprises the steps of: selecting mixed high conductivity nanometer materials, configuring coating slurry, and employing a micro-concave coating process to perform coating of a thermal conductivity material layer at the surface of the polymer diaphragm. The composite diaphragm with the high conductivity material layer has the insulativity, high thermal conductivity feature and the high mechanical strength of the thermal conductivity material and the flexibility, the insulativity and the ion permeability of the polymer diaphragm material to achieve the chemical inertness, the fast heat conduction and the high strength mechanics of the composite heat conduction diaphragm with high heat conduction and high mechanical strength.

The invention discloses a method for preparing a PVDF (Polyvinylidene Fluoride) lithium ion battery diaphragm by electrostatic spinning. The method comprises the following steps: firstly, preparing polyvinylidene fluoride glacial acetic acid solution with the concentration of 17-20 percent by weight; secondly, stirring the polyvinylidene fluoride glacial acetic acid solution to be uniform; thirdly, completely cooling the polyvinylidene fluoride glacial acetic acid solution at room temperature of 25DEG C to obtain spinning solution; fourthly, taking a proper amount of spinning solution by using an injector, placing the injector on an injection pump, connecting a needle head, clamping an anode of a high voltage static generator on the needle head, enabling a cathode of the high voltage static generator to be connected with a receiving screen, and laying tin foil paper on rollers; fifthly, setting the spinning speed, adjusting the spinning voltage and the spinning distance and then performing static spinning; after the spinning is ended, taking off the tin foil paper from the rollers to obtain the lithium ion battery diaphragm. The method disclosed by the invention has the advantages of simple process, low energy consumption, low production cost and high performances of products; the pore size and the film thickness can be flexibly controlled, the improvement on both the ionic transparency of the diaphragm and the cycle performance of the battery is facilitated, and a good marker prospect is obtained.

The invention provides a compound isolating film and a formation method thereof. The method comprises the following steps of: dissolving polyethylene glycol oxide in an acetone solvent; dispersing the polyethylene glycol oxide in the acetone solvent to form a polymer solution; soaking a polyolefine microporous film in the polymer solution; taking out the soaked polyolefine microporous film; and drying the polyolefine microporous film to form the compound isolating film. In the method, the acetone solvent is used for compounding the polyethylene glycol oxide and the polyolefine microporous film; and the polyolefine microporous film is modified to obviously enhance the solution absorption capability and the ion penetrating capability of the isolating film. Moreover, the acetone solvent has low price and does not have harm basically, and therefore, the production cost is reduced and the production operating safety is enhanced.

The invention discloses a water electrolysis diaphragm and a manufacturing method thereof, and the diaphragm is a woven fabric diaphragm, the woven fabric diaphragm is fromed by high-temperature-resistant acid and alkali resistant fiber which is frequently used at temperature of 150 DEG c or higher; the maximum pore diameter of the woven fabric diaphragm is 15-55 microns, pores wuth the pore diameter less than 10 [mu] m accounts for 80.0-95.0%, and pores wuth the pore diameter between 11 microns and the maximum pore diameter accounts for 5.0-20.0 %. The water electrolysis diaphragm provided bythe invention has high ion permeability and excellent hydrophilicity, and has the characteristics of simple production process and no pollution to the environment.