51results about How to "Improved resistance to heat shrinkage" patented technology

The invention discloses a high-performance flexible composite nonwoven fabric membrane for a lithium ion battery, as well as a preparation method and an application of the membrane, which belongs to the technical field of a lithium-ion battery membrane material. The prepared composite nonwoven fabric membrane is formed by coating functional serous fluid with thermally curable or optically curable functional groups onto a substrate membrane containing an active functional group, thermally curing or optically curing the substrate membrane, removing a pore-forming agent, and hot pressing and drying the substrate. The prepared composite nonwoven fabric membrane is good in flexibility. The composite nonwoven fabric membrane has good ion electric conductivity and hot shrinkage resistance, can bear the large-current discharge, and also can improve the safety performance of the battery. Since no fluorine-containing adhesive is used in a preparation process, nano particles or nano optical fibers are connected with the substrate membrane through a chemical key, the nano particles or the nano fibers are bonded together through the chemical key and free from dropping off in the charging-discharging cycle, the stability of the coating is enhanced, and the cycling performance of the battery can be improved. The prepared flexible composite nonwoven fabric membrane is used as a membrane assembly of the lithium ion battery.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an inorganic and organic composite multihole diaphragm. The diaphragm comprises a multihole diaphragm base material and an active coating layer attached to at least one surface of the multihole diaphragm base material, wherein the active coating layer comprises inorganic particles, vinylidene fluoride and hexafluoropropylene copolymer, cellulose based polymer with the molecular weight of 100,000 to 1,000,000 and at least one of polyacrylic acid and polyacrylate. Compared with the prior art, the diaphragm keeps relatively high air permeability and lithium ion transmission capacity; the active coating layer and the multihole diaphragm base material are well bonded; and the overheating contraction performance and the puncture strength of a diaphragm base can be improved remarkably. Furthermore, the invention also discloses a preparation method for the diaphragm and a lithium ion battery with the diaphragm.

The invention discloses an inorganic/organic composite functional porous isolating membrane. The isolating membrane comprises porous base material and at least one inorganic functional coating adhering to the surface of the porous base material, and aqueous slurry prepared for the inorganic functional coatings is prepared from inorganic ceramic particles, water-soluble polymer thickener and aqueous polymer adhesive; the inorganic ceramic particles comprise the same substance in two types of particle sizes, wherein the average particle size (D50) of the smaller inorganic ceramic particles is 0.2-0.5 micrometer, and the average particle size (D50) of the larger inorganic ceramic particles is 0.6-1.0 micrometer; the aqueous polymer adhesive is a hydrophobic high-molecular polymer with the water drop contact angle of the dry adhesive of the aqueous polymer adhesive 110-140 degrees; the solid content of the aqueous slurry is 40-60%. According to the inorganic/organic composite functional porous isolating membrane, the high-temperature thermal stability of the isolating membrane can be effectively improved by means of the inorganic functional coatings, and the water content of the inorganic coatings is effectively reduced, so that the safe performance of a battery and the stability of long-term circulation are improved.

The present invention relates to a lithium ion battery composite separation membrane, which comprises: (a) a porous substrate having pores; and (b) an organic/inorganic composite layer formed by coating at least a surface of the porous substrate or partial surface area of the porous substrate with a mixture containing inorganic particles, one or a plurality of polymer binders selected from polyetherimide, polyetherketoneketone and polyisophthaloyl metaphenylene diamine, and an optional high temperature closed-cell material, wherein the inorganic particles are connected and are fixed with the polymer binder, and the gap between the inorganic particles forms the pore. According to the present invention, the organic/inorganic composite layer on the separation membrane is firmly bonded onto the porous substrate, and the polymer binder in the organic/inorganic composite layer substantially does not swell in the electrolyte, and further has good heat-shrinkage resistance so as to ensure the safety performance of the lithium ion battery. The present invention further relates to a method for preparing the composite separation membrane and an ion battery containing the composite separation membrane.

The invention discloses an alumina particle-filled composite multi-arc hole membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base material are filled with micro-nano Al2O3 particles; the diameters of the micro-nano Al2O3 particles are 50-800nm; and the micro-nano Al2O3 particles account for 20%-50% of total weight of the composite multi-arc hole membrane material. According to the micro-nano composite multi-arc hole membrane material, the porosity is 30%-60%; the surface mean pore size is 50-800nm; and the thicknesses are 10-40 microns. The micro-nano composite multi-arc hole membrane material disclosed by the invention has high-temperature resistance, heat shrinkage resistance, high-voltage and high-current shock resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super-capacitors as a safety battery diaphragm and a safety super-capacitor diaphragm. The invention further provides a preparation method of the nano composite multi-arc hole membrane material, and an application of the nano composite multi-arc hole membrane material as the battery diaphragm.

The invention discloses a gel polymer electrolyte for a lithium ion battery, and a preparation method thereof. The gel polymer electrode is composed of a polymer film as a substrate, and an electrolyte adsorbed to the polymer film; and the polymer film is made through the following steps: co-dissolving Carbomer resin, polyvinylidene fluoride and cellulose acetate butyrate in a solvent, mechanically stirring to form a liquid, coating the liquid, and solidifying the coated liquid on a polyolefin micro-porous film. The preparation method of the gel polymer electrolyte comprises the following steps: co-dissolving polyvinylidene fluoride and cellulose acetate butyrate in the solvent to prepare a liquid 1, adding the Carbomer resin to the liquid, fully stirring to form a liquid 2, immersing the polyolefin micro-porous film in the liquid 2, drying, immersing the dried polymer film in the electrolyte, and taking out the immersed film. The polymer lithium ion battery comprises the gel polymer electrolyte, a positive electrode and a negative electrode. The gel polymer electrolyte has the advantages of thermal contraction resistance, high conductivity and high electrochemical stability.

The invention relates to a graphene regenerated rubber and plastic foamed colloidal particle for soles. The graphene regenerated rubber and plastic foamed colloidal particle for soles is prepared fromthe following ingredients in parts by weight: 60 to 65 parts of EVA (Ethylene-vinyl acetate copolymer) waste materials, 23 to 25 parts of natural rubber, 4 to 6 parts of POE (Polyolefin elastomers),1 to 2 parts of modified graphene, 0.1 to 0.2 part of poly N-vinylacetamide, 2.0 to 2.3 parts of white mineral oil, 1.0 to 1.2 parts of silicone oil, 1.4 to 1.5 parts of active zinc oxide, 0.8 to 1.0part of zinc stearate, 0.8 to 1.0 part of stearic acid, 0.8 to 1.0 part of crosslinking agents, 2.0 to 3.0 parts of flow additives and 1.5 to 1.8 parts of foaming agents. According to the invention, the existing EVA waste materials are sufficiently utilized; resources are regenerated; and the foamed colloidal particle with the physical properties reaching a standard and the heat-shrinkage-resistant performance capable of being enhanced is obtained.

A separator having a heat-resistant insulating layer of the present invention includes a porous resin base layer and a heat-resistant insulating layer which is formed on one or both sides of the porous resin base layer and contains inorganic particles and a binder. The porous resin base layer contains a resin having a melting temperature of 120° C. to 200° C. The separator is configured so that the ratio of the basis weight of the heat-resistant insulating layer to the basis weight of the porous resin base layer is not less than 0.5. Accordingly, the separator having a heat-resistant insulating layer of the present invention exhibits excellent thermal shrinkage resistance while ensuring a shutdown function.

The invention discloses a lithium battery separator and a preparation method and application thereof. Cellulose and inorganic matter particles are contained in raw materials of the separator, wherein the inorganic matter particles are selected from more than one of silicon dioxide, aluminum oxide, boehmite, titanium oxide, zirconium oxide, tin oxide, magnesium oxide and silicon carbide.

The invention discloses a polytetrafluoroethylene nanoparticle (PTFE-NP)-filled composite tortuous porous membrane material. With polyimide (PI) nanofiber nonwoven fabric as a base material, holes of the base materials are filled with polytetrafluoroethylene nanoparticles (PTFE-NPs); the PTFE-NPs are 100-300nm in diameter and account for 30%-60% of total weight of the composite tortuous porous membrane material; and the PI nanofiber nonwoven fabric is electrospinning PI nanofiber nonwoven fabric of which the thickness is 9-38 microns, the porosity is 60%-80% and the fiber diameters are less than 0.5 micron. The nano composite tortuous porous membrane material disclosed by the invention has the advantages of high temperature resistance, heat shrinkage resistance, high voltage impact resistance, high current impact resistance and mechanical impact resistance, and is suitable for manufacturing various high-capacity and high-power lithium batteries or super capacitors as a safe battery diaphragm and a safe super capacitor diaphragm. The invention further provides a preparation method of the nano composite tortuous porous membrane material and an application of the composite tortuous porous membrane material as a battery diaphragm.

The invention discloses a functional coating material component of an isolating membrane for a power battery. The functional coating material component of the isolating membrane for the power batterycomprises a base film and a coating layer; the coating layer comprises the following materials taken as components calculated in parts by mass: 30-40 parts of nano-scale aluminum oxide, 30-40 parts ofaramid fibers, 10-20 parts of polymer emulsion, 5 to 10 parts of porous polyimide nanofibers, 5-10 parts of nano-porous shell powder and diatom mud, 5-10 parts of a crosslinking agent, 1-5 parts of an aqueous fluorine leveling agent, 2-5 parts of a dispersant and 1-3 parts of a stabilizer. The isolating membrane is added with the aramid fibers to improve the porosity uniformity of the isolating membrane and increase the puncture resistance strength of the isolating membrane, and has good heat shrinkage resistance to improve the practical life of the battery, in addition, the isolating membrane is added with the porous polyimide nanofibers and the nano-porous shell powder and the diatom mud, and the porous material structure has excellent liquid absorption to greatly improve the performance of ions passing through the isolating membrane and the conductive capability so as to further improve use performances of the battery.

The invention discloses a micro-nano composite multi-curved-pore membrane material. The polyimide (PI) nanofiber non-woven fabric is taken as the base material; the pores of the base material are filled by silicon dioxide particles; the diameter of the micro-nano silicon dioxide particles is 50-800 nm, accounting for 20-50% of the total weight of the micro-nano composite multi-curved-pore membrane material; and the PI nanofiber non-woven fabric is 9-38 um in thickness, and 60-80% in the porosity. The micro-nano composite multi-curved-pore membrane material prepared by the invention is high temperature resistant, thermal shrinkage resistant, high voltage resistant, high current impact resistant, and mechanical collision resistant, and suitable for being used as safe battery membranes and safe supercapacitor membranes for manufacturing various high-capacity and high-power lithium ion batteries or supercapacitors. The invention also provides a preparation method for the micro-nano composite multi-curved-pore membrane material, and application of the membrane material in being used as the battery membranes.

The invention discloses novel polyimide microsphere slurry and a coated diaphragm thereof, and is applied to the field of lithium ion batteries. The slurry is composed of polyimide microspheres, inorganic particles, a binder, a surfactant, a dispersant and a solvent. The coating diaphragm is obtained by coating the slurry on the surface of at least one side of a porous base membrane in a manner of micro-concave coating, extrusion coating, transfer coating, dip coating or bar coating and then drying, and the coating diaphragm has excellent lithium dendrite puncture resistance and an effect of preventing short circuit in a battery by high-temperature hole closing. Compared with a common ceramic diaphragm, the novel polyimide microsphere slurry coated diaphragm provided by the invention has more excellent cohesiveness and thermal shrinkage resistance. The novel polyimide coated diaphragm has lower surface density than a ceramic coated diaphragm, and the energy density of the lithium ion battery is remarkably improved. The slurry and the diaphragm provided by the invention are adaptive to the existing mature diaphragm coating process, and have great application prospects.

The invention provides an aramid UV coating for a battery isolation membrane. The aramid UV coating comprises the following components in parts by weight: 70-80 parts of aramid, 2-8 parts of a resin binder, 1-5 parts of an initiator, 0.1-2 parts of a dispersing agent and 0.5-1 part of a stabilizer. According to the aramid UV coating for the battery isolation membrane, the thickness and hole uniformity is improved, the puncture strength of the isolation membrane is improved, the water content is reduced, the aramid UV coating has good thermal shrinkage resistance and the service life of a battery is effectively prolonged.

The invention discloses a composite diaphragm and application thereof. The composite diaphragm comprises a diaphragm matrix and an active lithium source coating, wherein the active lithium source coating is arranged on the diaphragm matrix, and the active lithium source coating comprises a nano active lithium source, a nano catalyst, a ceramic electrolyte and a binder. Therefore, multiple effectsof improving the safety of the battery, supplementing lithium and improving the conductivity of the diaphragm are achieved.

The invention discloses a nano composite multi-arc-hole membrane material. The nano composite multi-arc-hole membrane material is characterized in that a polyimide (PI) nano fiber nonwoven fabric is used as a base material, and pores of the base material are filled with nano boric nitride particles; the diameter of the nano boric nitride particles falls in a range of 50nm to 100nm, and the nano boric nitride particles account for 30 to 60 percent in the total weight of the nano composite multi-arc-hole membrane material; the thickness of the PI nano fiber nonwoven fabric is ranged from 9 micrometers to 38 micrometers, and the porosity is ranged from 60 percent to 80 percent. The nano composite multi-arc-hole membrane material is resistant to high temperature, heat shrinkage, high voltage, high current impact and mechanical collision, suitable for being used as a safety cell diaphragm and a safety super capacitor diaphragm and suitable for manufacturing various high-capacity and high-power lithium cells or super capacitors. The invention also provides a preparation method of the nano composite multi-arc-hole membrane material and an application of the nano composite multi-arc-hole membrane material as a cell diaphragm.

The invention discloses a lithium ion battery, an isolation membrane of the lithium ion battery and a preparation method of the isolation membrane. The isolation membrane comprises embedded copolymer resin which is formed by copolymerizing a monomer A and a monomer B, wherein the monomer A is selected from cyanate ester and derivatives of cyanate ester, and the monomer B is selected from olefin and derivatives of olefin; the thermal shrinkage of the embedded copolymer resin is smaller than 3 percent at the condition of 130DEG C/3h. Compared with the prior art, the isolation membrane of the lithium ion battery is excellent in thermal shrinkage performance, so that the short circuit of the lithium ion battery at the high temperature can be effectively improved, and the rate performance and the cycling performance of the battery also can be improved.

The invention discloses an elastic body polrvinyl chloride nylon sheathed cable. The elastic body polrvinyl chloride nylon sheathed cable comprises a plurality of cable cores and sheathes, wherein the cable cores consists of conductors and insulated layers packaged at the exteriors of the conductors, and the cable cores and filling ropes are twisted to form the cable cores; and inner sheathes are pressed and packaged outside the cable cores, and outer sheathes are pressed and packaged outside the inner sheathes. According to the cable, the structure is simple, proper materials are selected, the environmental pollution is avoided, the friction coefficient of the cable is small, the tube penetration is convenient, the chemical resistance is good, and the cable has the functions of defending mice and ants; and better mechanical property can be still maintained under a rugged environment, and the service life can be up to 40 years.

The invention discloses a heat shrinkage-resistant sealing ring and a preparation method thereof. The preparation method comprises the following steps: 1) performing contact reaction on polyamide fibers, cyclodextrin, a silane coupling agent and water, then filtering, taking a filter cake and drying to prepare modified polyamide fibers; 2) performing a solvo-thermal reaction on the modified polyamide fibers, cobalt salt, alkali, urea and ethanol, then filtering, taking a filter cake and finally calcining in the presence of protective gas to prepare composite polyamide fibers; 3) mixing the composite polyamide fibers, a shell powder, attapulgite, barium sulfate whiskers and rare earth oxide to prepare a modified composition; 4) mixing styrene butadiene rubber, ethylene-propylene-diene monomer rubber, a talcum powder, zinc borate, white carbon black, white oil, aluminum hydroxide and the modified composition and forming to prepare the heat shrinkage-resistant sealing ring. The sealing ring prepared by the preparation method disclosed by the invention has excellent thermal shrinkage resistance; moreover, the preparation method has the advantages of being simple in process and easily-available in raw materials.