624results about How to "Improve conduction ability" patented technology

Disclosed is an organic / inorganic composite porous film comprising: (a) inorganic particles; and (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles, wherein the inorganic particles are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a micropore structure. A method for manufacturing the same film and an electrochemical device including the same film are also disclosed. An electrochemical device comprising the organic / inorganic composite porous film shows improved safety and quality.

The invention discloses a waterborne ceramic coated membrane for a lithium ion battery and a preparation method thereof. The waterborne ceramic coated membrane comprises a microporous membrane and a ceramic coating, the ceramic coating is arranged on one side or two sides of the microporous membrane and prepared from, by weight, 40-70 wt% of water and 30-60 wt% of base materials, and the base materials include, by weight, 65-98 parts of boehmite powder, 1-15 parts of waterborne wetting agent, 1-15 parts of waterborne adhesive and 1-5 parts of waterborne dispersant. The waterborne ceramic coated membrane is good in conduction effect and high in thermostability and safety.

The invention discloses a preparation method of a nano oxide coated long-life lithium ion sieve adsorbent. The method comprises the steps of: 1. dissolving a nano oxide and crushed lithium ion sieve adsorbent powder respectively in a same solvent according to a mass ratio of 1-10:100, and conducting ultrasonic dispersion for 0.5-3h to obtain two solutions; 2. mixing the two solutions uniformly, adjusting the PH to 8-10 with ammonia water, evaporating the solvent to dryness under stirring, and grinding the material obtained by evaporation to obtain nano oxide coated adsorbent powder; and 3. blending the nano oxide coated adsorbent powder with a polymer containing organic solution, conducting stirring for 2-4h, then adding the obtained suspension into deionized water drop by drop, thus obtaining the uniform spherical granular adsorbent with a particle size of 1-5mm. The preparation method of the nano oxide coated long-life lithium ion sieve adsorbent provided by the invention can improve the service life of the lithium ion sieve adsorbent.

Various embodiments of the present invention relate to a power amplification device and method, wherein the power amplification device can comprise: a power amplifier; a switch mode converter for controlling a bias of the power amplifier; a comparator for providing a switching signal to the switch mode converter according to an envelope signal; and a control unit for determining whether a switching frequency of the switch mode converter is within a specific band and applying an offset to the switching frequency so as to deviate from the specific band if the switching frequency of the switch mode converter is within the specific band. Various other embodiments can be carried out.

The invention relates to the production of a spherical hollow filling body for filling containers for combustible and inflammable liquids or gases, and to a method for the especially advantageous usesthereof, for example, for preventing explosive combustion processes and explosions, for extinguishing fires, as protection against corrosion in tanks, for separating fuels and water, as protection ag ainst bacteria and fungi in fuel tanks, as protection against theft, for reducing hydrocarbon emissions, for increasing the stability and safety of tanks in the event of a crash, for reducing the boil-off effect of hydrogen, for applications in the chemical industry, for deriving static electricity from fuel containers, for protection against electromagnetic interferences, for reducing and slowingdown the B.L.E.V.E. effect, for increasing the filling quantity of gas containers, for heating and cooling liquids and gases, and for reducing evaporation loss. The invention also relates to methodsfor producing the filling body. Figure 1 shows a spherical filling body according to the invention, consisting of a plurality of disk-type circular vertical surfaces (1, 2 and 3) and a plurality of disk-type circular horizontal surfaces (7, 8 and 10) which are parallel to each other. A circular opening (6) is located in the centre of the horizontal surface (10), said opening forming an axial continuous tube in the centre, from the top (4) to the bottom (5), together with the upper, inwardly open, circular sleeve-type body (4) and the lower, inwardly open, circular sleeve-type body (5), the inner diameters of the sleeve-type, inwardly open circular bodies (4 and 5) and the circular opening (6) being identical. The vertical surfaces (1) extend from the outer edge of the spherical body to theedge of each circular opening (4, 5 and 6) of the parallel horizontal surfaces (7, 10 and 8) respectively surrounding the openings.

The invention relates to a lithium ion battery graphene conductive agent and a preparation method thereof. The graphene conductive agent comprises the following components by mass: 25-30 parts of graphene, 10-15 parts of polyethylene glycol, 5-10 parts of monoethanolamine, 100-160 parts of a solvent, 1-5 parts of a rare earth element, and 0.5-1 part of titanium carbide. According to the invention, the graphene conductive agent utilizes the excellent conductivity of graphene to enhance the capacity of an electrode material, reduce the battery internal resistance, and improve the battery cycle life. The dosage of the graphene conductive agent only accounts for 50-60% of that of existing conductive agents during preparation of a lithium ion battery, the binder dosage is reduced by 18%, and the 2C multiplying power is improved by 6-10%, the cost is saved, and the lithium ion battery can be more competitive.

The invention discloses a method for preparing a compound electrical contact material. The technical process comprises the following steps of: (1) preparing a catalyst precursor, preparing a Ni-based catalyst from a mixed aqueous solution of hexahydrated nickel nitrate and hexahydrated yttrium nitrate, and depositing on a sample copper sheet which is subjected to plasma treatment and washed to obtain a catalyst precursor, wherein the mass ratio of nickel to yttrium is 1-10; (2) preparing a CNTs (Carbon Nanotube) array, putting the catalyst precursor into a quartz boat, undergoing a decomposition reaction under the protection of argon gas, and undergoing a catalytic pyrolysis reaction to obtain a sample copper sheet on which a CNTs array grows; and (3) preparing a CNTs-Ag-Cu compound electrical contact material, adding a silver nitrate aqueous solution into the sample copper sheet on which the CNTs array grows, soaking the silver nitrate aqueous solution into the CNTs array of the sampler copper sheet under the low ultrasonic action, evaporating and decomposing repeatedly for 3-20 times for 0.2-3 hours every time till the CNTs array is fully filled.

The invention discloses an inorganic matter-filled poriferous composite membrane for a liquid flow energy-storage cell and a use thereof. The inorganic matter-filled poriferous composite membrane for a liquid flow energy-storage cell is characterized in that one or more of organic polymer resins and sulfonated organic polymer resins are prepared into a poriferous diaphragm as a matrix; inorganic matter particles are filled into apertures of the matrix so that the inorganic matter-filled poriferous composite membrane is obtained; and the inorganic matter particles are prepared from one or more of silicon oxide, zirconia, titanium oxide, lead oxide, tungsten oxide and zirconium phosphate. The inorganic matter-filled poriferous composite membrane can be prepared by simple processes, has controllable apertures, is suitable for large-scale production, has high ion selectivity, hydrophily and ion conductivity, can realize ion transport without introduction of any ion exchange groups, and broadens a selection scope of liquid flow energy-storage cell membrane materials.

The invention discloses an electrolyte of a lithium-ion secondary battery, which adopts fluoro-carbonate, high molecular weight chain carbonate and N, N-dimethyl trifluoro ethyl amide as cosolvent, and an organboron compound as an enhanced conductivity additive, and also contains film forming additive vinylene carbonate, 1,3-propyl sultone and a non-aqueous organic solvent in which lithium salt is dissolved. The battery assembled by using the electrolyte has good charging performance and discharging performance at low temperature, and the flame retardant property of the electrolyte is remarkably improved as the fluoro-carbonate is added.

The invention discloses a lithium ion battery nano composite positive-negative electrode material containing a three-dimensional conductive network as well as a preparation method thereof. Technical key point is that the three-dimensional conductive network is built by comprehensively using a modified and dispersed one-dimensional conductive nano material with great slenderness ratio and high strength and a zero-dimensional nano conductive material under action of a binding agent, so that mechanical strength and processing performance of the positive-negative electrode material of the lithium ion battery as well as transmissibility of electrons among particles are improved, and therefore, a problem that the typical lithium ion battery electrode material is poor in great multiplying power performance and short in cycle life is solved. The preparation method of the lithium ion battery nano composite positive-negative electrode material comprises the following steps: firstly, adding the one-dimensional conductive nano material into water or an organic solvent containing a surfactant for ultrasonic treatment and stirring treatment so as to sufficiently disperse one-dimensional conductive nano material; and then, respectively adding the dispersing liquid into a zero-dimensional conductive agent, a binding agent and the positive-negative electrode material for ultrasonically stirring and stirring for a certain time at a high speed to obtain the lithium ion battery nano composite positive-negative electrode material containing the three-dimensional conductive network.

The invention discloses a compound composition used for increasing the crop fertilization rate. The compound composition comprises a first component of phethalanilic acid, a second component selected from one or more of brassinolide, 6-benayl aminopurine, compound sodium nitrophenolate, diethyl aminoethyl hexanoate, prohexadione calcium, grain yellowing agents, forchlorfenuron, triacontanol, chlormequat chloride, mepiquat chloride, paclobutrazol, uniconazole, amino-oligosaccharin, humic acid, amino acid, alginic acid and chitosan oligosaccharide, and a third component selected from one or more of boric fertilizer, calcium fertilizer, nitrogen fertilizer, potash fertilizer, phosphatic fertilizer, iron fertilizer, copper fertilizer, magnesium fertilizer, manganese fertilizer, molybdenum fertilizer and silicon fertilizer. The composition can be prepared into an aqueous solution or a soluble solution or wettable powder or water dispersible granules which are allowed to be used for agriculture. The compatibility of all the components is reasonable, the key risks of the phethalanilic acid are lowered while it is ensured that the crop fertilization rate is effectively increased, the nutrition level and stress-resistant capacity of crops are improved, and the increase of production and income of crops is promoted.

The invention relates to a full-solid-state battery, which comprises a positive electrode and solid-state electrolyte, wherein a positive electrode active material on the surface of the positive electrode is in contact with the solid-state electrolyte; the positive electrode active material and the solid-state electrolyte contain same substances. Preferably, the identical substance ingredients arefast ion conductors Li1+xAlxTi2+x(PO4)3 (the x is greater than 0 but smaller than or equal to 0.5). Therefore the composition ingredients of the solid-state electrolyte and the composition ingredients of the positive electrode active materials contain the identical substances, so that the homogenesis compatibility between the battery positive electrode and the solid-state electrolyte is improved;the interface resistance is reduced. The invention also relates to a preparation method of the full-solid-state battery.

The invention discloses a method for preparing a high-temperature proton exchange membrane. The method is characterized by comprising the following steps: introducing a precursor composition with a metal organic frame into oxidized graphene to form a coexisting body of the oxidized graphene and the metal organic frame, subsequently adding the coexisting body together with a sodium hydroxide solution into an N-methyl pyrrolidone solution of sulfonyl chlorination polyphenyl ether to perform Hinsberg reaction to obtain polymer membrane casting liquid with the coexisting body, coating and drying so as to obtain the high-temperature proton exchange membrane. According to the method, the metal organic frame is introduced into the oxidized graphene by using a hydrothermal method to form the coexisting body, and is further prepared into the high-temperature proton exchange membrane together with sulfonated polyphenyl ether in a chemical bond mode, the membrane is good in mechanical strength, thermal stability and excellent high-temperature proton conductivity and oxidative resistance, and can be applied to high-temperature proton exchange membrane fuel batteries.

The invention discloses a preparation method for a graphene and metal composite electromagnetic shielding film. The method comprises the steps of extruding graphene or graphene oxide dispersion liquid from a horizontal type die orifice preparation device by a solution wet spinning method, and performing solidification drying reduction to obtain a graphene film; then depositing metal on the surface of the graphene film through physical vapor deposition or chemical electroplating to obtain the electromagnetic shielding film in which the graphene film is used as a substrate and a single surface or two surfaces is or are covered by a metal layer or two metal layers. The graphene film prepared by the preparation method is adjustable in thickness and size; a micro structure is regular; the grahene film is extremely high in conductivity and wide in absorption frequency band, and has a wide application prospect in the field of electromagnetic shielding and wave absorption.

The invention discloses a cross-linked polymer-based all-solid-state electrolyte material and an application of cross-linked polyoxyethylene ether. The cross-linked polymer-based all-solid-state electrolyte material comprises cross-linked polyoxyethylene ether, lithium salt and a modifying agent. An electrolyte membrane prepared from the electrolyte material containing the cross-linked polyoxyethylene ether has relatively high conductivity and a wide electrochemical window; and an assembled half-cell has good high-temperature cycle performance, and the retention rate of the charge-discharge specific capacity of the half-cell is high.

Adequate patient enrollment and participation in different design stages of a clinical trial is facilitated and scaled by dynamically adjusting clinical trial criteria relative to characteristics and conditions of massive numbers of patients whose medical records have been aggregated in databases in compliance with patient privacy and confidentiality laws and regulations. Patient participation results without intervention by multiple providers of healthcare services, and by directly identifying and communicating with qualified patients while maintaining patient privacy and compliance requirements as required by law.

The invention discloses a preparation method of a lithium ion battery cathode material SiOX-TiO2 / C. The preparation method comprises steps as follows: analytically pure organic silicon sources, organic titanium sources and organic carbon sources are weighed in a certain mole ratio; the organic silicon sources are dissolved in a mixed solution of deionized water and absolute ethyl alcohol and stirred, the pH of the solution is adjusted to be alkaline, and a mixed solution A is obtained; the organic titanium sources are dissolved in the absolute ethyl alcohol and stirred for a period of time, and a mixed solution B is obtained; the mixed solution B is added to the mixed solution A and left to stand at the room temperature after being stirred for a period of time, and a colloidal mixed solution is obtained; after the colloidal mixed solution is mixed with the organic carbon sources, mechanical ball-milling treatment is performed; the mixed solution after mechanical ball-milling treatment is dried, and a precursor is obtained; the precursor is put in a crucible and calcined under the protection of inert atmosphere, thermal insulation is performed for multiple hours, and a product is cooled to the room temperature with the furnace. Compared with the prior art, the cathode material prepared with the method has good rate performance, the raw materials are cheap, the preparation process is simple, and the yield is high.

A process for preparing a multi-element acidic soil conditioning agent from the alkali dregs and city sludge includes such steps as adding calcium lime to city sludge for stabilizing and disinfecting it, modifying the alkali dregs by (NH4)2HPO4, mixing them together, stacking to obtain compost, drying and breaking.

The invention provides a battery pack which comprises a plurality of heat-conducting partition plates, at least one heat-conducting pipe and a plurality of single batteries, wherein the heat-conducting partition plates are arranged in a laminating manner; each heat-conducting partition plate comprises two partition plate main bodies and a connector; every two partition plate main bodies are paved horizontally and arranged at an interval; each connector is connected with every two partition plate main bodies; the heat-conducting pipes penetrate through the connectors of the heat-conducting partition plates; the heat-conducting partition plates are fixed on the heat-conducting pipes; a battery containing space is arranged between every two adjacent partition plate main bodies in a laminating direction of the heat-conducting partition plates; and one single battery is arranged in each battery containing space.

The invention relates to a mechanical heat switch for a refrigerating machine to directly cool a superconducting magnet, which comprises a corrugated pipe upper flange (3), a corrugated pipe (4), a glass fiber reinforced plastic rod (5), a plug-unplug type electric joint (6), a fixed electric joint (7) and a superconducting magnet (8), wherein the upper end of the glass fiber reinforced plastic rod (5) is connected with the corrugated pipe (4) through the corrugated pipe upper flange (3), the lower end of the glass fiber reinforced plastic rod (5) is provided with the plug-unplug type electric joint (6), the fixed electric joint (7) is arranged under the plug-unplug type electric joint (6) and is arranged on the superconducting magnet (8), the plug-unplug type electric joint (6) is connected with a primary cold head (1) of the refrigerating machine, and a secondary cold head (2) of the refrigerating machine is connected with the fixed electric joint (7). The mechanical heat switch for the refrigerating machine to directly cool the superconducting magnet has the advantages that in the magnet temperature reduction process, the great cold quantity of the primary cold head of the refrigerating machine is utilized, the structure is simple, the operation is convenient and reliable, and the conduction capability is high. When the switch is switched off, no additional heat conduction is caused between the primary cold head and the secondary cold head of the refrigerating machine, and the effective utilization of the secondary cold quantity of the refrigerating machine is ensured.

The invention relates to a disc type motor of an integral cooling heat radiation structure. The disc type motor is an axial flux motor, and uses a double-stator and single-rotor structure. The disc type motor comprises an enclosure assembly, wherein a rotor assembly is used for fixing a non-driving end stator assembly and a driving end stator assembly onto the enclosure assembly; the rotor assembly is positioned between the non-driving end stator assembly and the driving end stator assembly; a rotary transformer assembly is fixed on the non-driving end stator assembly; and an outlet box assembly is directly welded onto the enclosure assembly. By using the measures that an iron core is prepared from ultra-thin silicon steel sheets so as to reduce iron consumption, magnetic steel uses an epoxy cladding material to block eddy currents so as to reduce the eddy-current loss, a stator winding uses a thin enameled wire to reduce high-frequency eddy-current copper loss and the like, end cover water channels on two sides of the disc type motor, an inner water jacket and an enclosure water channel are combined and integrally designed, so that the heat convection capacity of the motor system is improved; the disc type motor has the advantages of high overload capacity, compact structure, high power factor, great power density, wide speed adjustable range and the like, and is suitable for serving as power of pure electric vehicles and hybrid electric vehicles.

The invention relates to an azoxystrobin nano-water suspending agent, which comprise, by mass: 10-20% of azoxystrobin, 10-30% of hydrophobic dispersible nano-silica, 2-10% of a wetting dispersant, 0.2-3% of a thickening agent, 1-5% of an antifreezing agent, 0.01-0.2% of a preservative, and the balance water. The azoxystrobin nano-water suspending agent of the invention has the advantages of: small particle size, high fluidity, and enhanced penetration and conductivity within leaves. Due to enhanced surface energy, the nano-water suspending agent provided in the invention is easier to be adsorbed by plants. As wind blow and rain wash resistance are strengthened, pesticide residues flowing into water and soil can be reduced. With certain slow release effect, the azoxystrobin nano-water suspending agent in the invention can reach the purposes of improving drug effects and prolonging the duration period.

The invention provides a negative lead paste for a lead-carbon battery. The negative lead paste is prepared from the following components in parts by weight: 1-99 parts of lead powder, 0.1-90 parts of a carbon-oxide composite material, 0-0.5 part of carbon black, 0.1-2 parts of barium sulfate, 0.05-0.1 part of a short fiber and 0.01-3.2 parts of an organic swelling agent. Oxides on the surface and in holes of the carbon material of the lead paste are tightly adsorbed to the periphery of the carbon material in an ionic form, and are recombined on the surface and in the holes of the carbon material in curing and drying processes; and a tiny oxide film is evenly attached to the active surface and the holes of the carbon material by 'dissolving and recombination', so that the bonding degree of the carbon material and the oxides is greatly improved; the conduction characteristics and the capacitance characteristics of the carbon material are put into a fully play; and hydrogen evolution on the surface of the carbon material is limited.

The invention discloses a nucleotide-added water soluble fertilizer containing amino acid and a preparation method thereof. The water soluble fertilizer comprises the following components: compound amino acid, a major element of N, secondary elements of Ca and Mg, trace elements of Fe, Mn, Zn and Cu, composite sugar alcohol, pH modifier, water, nucleotide, chelating agent and surface active agent. The nucleotide can promote the synthesis and operation of calmodulin and calcium-dependent protein kinase (CDPKs) in plant bodies, while the calmodulin and the calcium-dependent protein kinase are receptors of Ca<2+> signals in cells, and can be used as carriers for operating Ca<2+> to promote the conductivity of the Ca<2+> in the plant bodies and improve the absorption and utilization rate of the Ca<2+> so as to avoid the loss of nutritional ingredients; meanwhile, the preparation method has the advantages of simple process, high productivity and low cost.

The invention belongs to the field of conductive printing ink, and in particular relates to conductive printing ink containing flake graphene and compound metal filling. The conductive printing ink is specifically prepared from the following components in parts by mass: 1 to 10 parts of a flake graphene conductive material, 10 to 30 parts of a nano metal conductive material, 20 to 50 parts of an adhesive, 1 to 5 parts of an auxiliary agent and 30 to 50 parts of a solvent. According to the conductive printing ink provided by the invention, graphene and nano composite metal particles are used as the conductive materials; a flake-shaped structure of the graphene and the nano-grade metal particles are tightly stacked for filling, so that the contact area of the conductive materials is enlarged, and the conductivity and current-carrying capability of a printed circuit are improved; the defect that the conductive performance is unstable after pure metal conductive printing ink is oxidized is overcome.

The invention relates to a thermal switch for conduction-cooled superconducting magnet, characterized in that it is the cylinder closed accommodator, comprising upper round plate [8], low round plate [10] and cylinder with thin wall [9]; the cylinder with thin wall [9] is the wall surface of cylinder closed accommodator; parallel red copper fins arranged in certain distance are set on inner surfaces of upper round plate [8] and lower round plate [10], fins on upper and lower round plates insert in cross and there is gap between adjacent fins; upper round plate [8] and lower round plate [10] are made of high thermal conductivity material and the cylinder with thin wall [9] is made of low thermal conductivity material; upper round plate [8], lower round plate [10] and cylinder with thin wall [9] are connected by positive and negative screw thread and the length of thermal switch [4] on the axial direction is controlled by the rotating depth of cylinder with thin wall [9]. The invention is provided with no need to vacuum pumping, strong conduction ability, big on-off ratio and no need to be controlled by outside. It can shorten the cooling time of prior conducting cooled magnet system.

The invention discloses an integrated air-cooled axial magnetic flux motor and belongs to the technical field of motor cooling. The motor is characterized in that a casing for connecting a front rotorand a rear rotor is provided with blades which are obliquely arranged, a rotor disc of the front rotor and / or the rear rotor is provided with an air inlet, a stator comprises a stator support, two axial ends of the stator support are symmetrically provided with a plurality of support columns which are radially arranged, a plurality of support columns form a plurality of U-shaped grooves along thecircumferential direction, the supporting columns at two ends are connected through a circumferential bottom, ventilation openings and circumferentially-arranged heat dissipation ribs are arranged atthe circumferential bottom, the stator iron core wound with the stator coil is embedded in the U-shaped groove, the rotor magnetic steel adopts an oblique pole type structure, a U-shaped heat pipe isfurther arranged on the stator core, one end of the U-shaped heat pipe is inserted into the stator core in the axial direction, the other end of the U-shaped heat pipe is located on a circumferentialouter surface of the stator core and tightly attached to the stator coil, and the stator core and the U-shaped heat pipe are integrally formed. The motor is advantaged in that the temperature of thewinding and the iron core in the axial flux motor can be effectively reduced, and thermal performance of the motor is improved.

Belonging to the technical field of nano-material preparation, the invention in particular relates to a ZnS / rGO / CuS nano-photocatalyst and a preparation method thereof. ZnS / CuS is a widely applied photocatalyst, the morphology of ZnS / CuS can be further regulated to increase the exposure number of active sites, thereby improving the photocatalytic activity of the photocatalyst. The zeolite imidazole framework material ZIF-8 has high specific surface area and abundant pore structures, and provides favorable conditions for construction of the photocatalyst. The preparation method of the materialincludes: firstly preparing graphene oxide (GO) loaded ZIF-8, and taking the product as the template to prepare the GO loaded ZnS porous nano-material ZnS / rGO, and finally introducing nano-CuS into the porous ZnS / rGO system to prepare the target product, i.e. ZnS / rGO / CuS nano-photocatalyst. The ZnS / rGO / CuS nano-photocatalyst provided by the invention has the advantages that: the ZnS prepared withZIF as the template has a super-large specific surface area, and provides more loading sites for CuS, thereby increasing the exposure number of active sites, and the introduction of graphene oxide cansignificantly improve the carrier conduction capacity, thereby significantly improving the photocatalytic activity of the photocatalyst.

The invention provides an anode of a high-energy lithium / thionyl chloride battery and a preparation method of the anode. The anode of the high-energy lithium / thionyl chloride battery contains acetylene black, a teflon emulsion, absolute ethyl alcohol and conductive carbon fiber, wherein the mass ratio of the acetylene black to the teflon emulsion to the absolute ethyl alcohol is 10: (0.8-1.2): (53-57), and the carbon fiber accounts for 8-12 percent of the acetylene black by mass. By virtue of the excellent conductivity of the carbon fiber, the charge transfer situation of active particles on the surface of the carbon anode is remarkably improved, the transmission of reaction ions and ionic charges is dredged, the anode electron conduction capability is improved, the passivation and deactivation process is retarded and the capacity and the working voltage of the lithium / thionyl chloride battery is improved, and therefore the high-energy lithium / thionyl chloride battery is very suitable for a battery using environment at -40-71 DEG C.

The invention provides a battery diaphragm and a preparation method thereof, a lithium ion battery and communication equipment. The battery diaphragm comprises a polyolefin diaphragm, and polyolefin molecules of the polyolefin diaphragm contain -SO3Li and -COOLi groups. The preparation method of the battery diaphragm comprises the following steps of a sulfonation step of the polyolefin diaphragm and a replacement reaction step of the polyolefin diaphragm. The lithium ion battery contains the battery diaphragm prepared by the method. The communication equipment contains the lithium ion battery. The battery diaphragm has good electrolyte affinity and increases the capacity for electrolyte retention and ionic conductivity. Lithium ions form a clear lithium ion transfer channel in the polyolefin diaphragm, so that the lithium ion battery has the large-current charging and discharging capacity. The preparation method has the advantages that the process is simple, conditions are easily controlled, the production efficiency is high and the production cost is reduced.