137results about How to "Lower internal resistance" patented technology

A method of producing a composite electrode having a specific surface area of at least 100 m²/gm for use in an electrochemical capacitor. The method comprises (a) providing exfoliated graphite flakes that are substantially interconnected to form a porous, conductive graphite network comprising pores; and (b) incorporating an electrochemically active material into at least a pore of the graphite network to form the composite electrode. The exfoliated graphite flakes are preferably obtained from the intercalation and exfoliation of a laminar graphite material selected from natural graphite, spheroidal graphite, synthetic graphite, highly oriented pyrolytic graphite, meso-carbon micro-bead, carbon/graphite fiber, carbon/graphite whisker, carbon/graphite nano-fiber, carbon nano-tube, or a combination thereof. A supercapacitor featuring such a composite electrode exhibits an exceptionally high capacitance value and low equivalent series resistance.

The invention discloses a flexible film type solid state super capacitor and a method for manufacturing the same; the flexible film type solid state super capacitor comprises a positive electrode, a negative electrode, an outer electrode and an encapsulation film, wherein a flexibility solid state electrolyte membrane is arranged between the positive and the negative electrodes. The manufacturing method is as follows: the outer electrode pasting, the electrode pasting, the flexibility solid state electrolyte pasting, the electrode pasting, the outer electrode pasting and the encapsulation pasting are orderly and precisely coated on a basal body by the printing technique; by fitting the corresponding pressing, drying, cutting and packaging techniques, the flexible film type solid state super capacitor with electrode-membrane-electrode structure is finally formed. The flexible film type solid state super capacitor has the advantages of low product internal resistance and good power characteristic, and is suitable for the large scale production and particularly applied to flexible electric products such as electric papers, intelligent name cards and plastics electric products, etc.

The button-type electrochemical capacitor comprises: a button-type anode cover and a button-type cathode cover, and the button-type anode cover is tightly coupled to the button-type cathode cover; inside the button-type anode cover and the button-type cathode cover, there are anode piece, cathode piece, multi-pore isolator and electrolyte; the anode piece is made by means of coating the anode active materials on the anode current collector; the cathode piece is made by means of coating the cathode active materials on the negative current collector; the anode piece is connected to the button-type anode cover; the cathode piece is connected to the button-type cathode cover; said anode piece, multi-pore isolator film and the cathode piece are winded together to form a square coil core.

The invention relates to a lithium ion capacitor. The lithium ion capacitor comprises a positive pole plate, a negative pole plate, a diaphragm and an electrolyte, wherein the diaphragm is arranged between the positive pole plate and the negative pole plate, the positive pole plate comprises a positive electrode current collector and a positive electrode material coated on the positive electrode current collector, the positive electrode material comprises a positive electrode active substance and a binding agent, the positive electrode active material is formed through in-situ combination of a metal oxide with one or more of porous graphene, porous graphdiyne and a porous carbon fiber material mixture, the negative pole plate comprises a negative electrode current collector and a negative electrode material coated on the negative electrode current collector, the negative electrode material comprises a negative electrode active substance and a binding agent, and the negative electrode active material is one of spherical nature graphite, graphitizing mesocarbon microspheres and graphitizing polyimide microspheres through in-site growth of a carbon nanotube or a nanometer metal nitride after pore forming and nitrogen treatment on the surface. The above lithium ion capacitor has the advantages of high working voltage, good power characteristic and high energy density, and is safe to use. Further, the invention also provides a preparation method of the lithium ion capacitor.

The provided composite material for super capacitor comprises: 5-95wt% expanded graphite, and 1-95wt% metal oxide. The preparation method comprises: high-energy grinding, sol dipping, or chemical deposition (CVD). This invention also introduces lower internal resistance, and needs low cost.

The invention relates to a chemical power source product, aiming at providing a preparation method of an active carbon electrode for a double electric layer capacitor. The preparation method is characterized by comprising the following steps: 1. filling binder into solvent, and fully stirring until the mixture is dissolved evenly; 2. after the active carbon and conductive agent powder are mixed, pouring into a binder solution, and fully mixing until even active carbon sizing agent is formed; and 3. evenly coating the active carbon sizing agent on a metallic matrix, drying and pressing to form the active carbon electrode. The active carbon electrode prepared by the method has the advantages of good aridity, small internal resistance, stable performance, long cycle life and the like.

The invention discloses a modification method of a single crystal ternary positive electrode material. The method comprises the following steps: mixing a precursor containing nickel, cobalt and manganese elements with a dopant metal soluble salt, adding pure water, uniformly stirring, and carrying out spray drying to obtain a pretreated precursor; carrying out low-temperature sintering on the pretreated precursor in an oxidizing atmosphere to obtain a low-temperature sintered product; and uniformly mixing the low-temperature sintering product with a lithium source, and carrying out high-temperature sintering in an oxidizing atmosphere to obtain the doped and modified single-crystal ternary positive electrode material. According to the invention, the precursor and the dopant are pre-sintered at a low temperature, most of the pre-sintered dopant uniformly coats the surface of the precursor in an oxide form, and then the pre-sintered precursor and the lithium salt are sintered at a high temperature, so that the dopant is prevented from forming an oxide coating layer on the surface of the ternary positive electrode material, and the internal resistance of the ternary positive electrodematerial is reduced; and the cycling stability of the lithium-ion battery is greatly improved.

The invention relates to a preparation method of a lead crystal carbon storage battery. A composite carbon material with high specific surface area is added to a negative plate of the battery, so that the battery provided by the invention has long cycle life and excellent high current charge-discharge capability. A weak acid electrolyte is introduced into the assembled battery, so that, compared with the battery employing a strong acid electrolyte in the prior art, the battery provided by the invention is low in internal resistance; the hydrogen evolution over-potential is improved; the hydrogen evolution problem is effectively solved. Due to the characteristic that the formed electrolyte is in a crystalline state, active materials can be firmly fixed; an enough space is provided for motion of ions; the disadvantages of sulfation of a negative electrode of the lead-acid storage battery, corrosion of a positive grid, active material dropping and the like are effectively overcome; the service lifetime of the battery is greatly prolonged; meanwhile, the formed electrolyte in the crystalline state does not generate acid vapor in the charging process, does not generate a leakage phenomenon and is environment-friendly and safe; and the battery has excellent low temperature resistance.

The invention provides a preparation method for cathode paste of a high-capacity lithium ion battery. The preparation method for the paste comprises the following steps: 1) each component is dried firstly; 2) after drying, polyvinylidene fluoride and 1-methyl-2-pyrrolidinone are mixed in proportion and dispersed, and a glue solution A is obtained; 3) Super-p and KS-6 are added to the dispersed glue solution A, obtained mixed paste is stirred uniformly, ground and filtered, and paste B is obtained; 4) a lithium iron phosphate material is added to 60%-70% of the paste B in two times and stirred, and paste C is obtained; 5) after stirring, the residual paste B and 1-methyl-2-pyrrolidinone remaining in total quantity are added to the solution and stirred, and the final paste is obtained. Substances of the paste have good dispersity, a preparation process is simple, preparation of conductive glue and combination of the paste can be performed simultaneously, and the efficiency is increased; the obtained battery is high in energy density, good in safety performance and low in internal resistance, and exertion of the maximum capacity per gram of the lithium ion battery is facilitated.

The invention relates to a composite adhesive, a pole piece prepared by means of the composite adhesive, a preparation method and an application thereof, wherein the composite adhesive, the pole piece, the preparation method and the application thereof belong to the technical field of energy storage devices. The composite adhesive is composed of the following components by weight: 1-13% of phosphoric acid, 20-45% of polyvinylidene fluoride, 5-9% of phenolic resin, 2-3% of amino resin, 6-11% of polyacrylate, 10-30% of acrylate terpolymer latex, 1-4% of carboxymethylcellulose sodium, 3-17% of polyimide, 2-4% of ethanol and 6-18% of N-methylpyrrolidone. The composite adhesive can reduce the internal resistance of a lithium ion battery or a super-capacitor and settle problems such as electrode powdering and electrode peeling-off caused by size increase of the pole piece. Utilization rate and cycle life of the electrode material are improved.

The invention relates to a preparation method of a modified mesoporous silica-doped solid-state polymer electrolyte for a lithium-ion battery. The method comprises the following steps: dissolving polymer matrix into a solvent to prepare a polymer solution; with lithium perchlorate (LiClO4) as a lithium salt, dispersing the modified mesoporous silica into the obtained polymer solution; carrying out dispersing and casting to form a film; and after the solvent volatilizes, obtaining a composite polymer film, namely the composite polymer electrolyte for the lithium-ion battery. The method is simple to operate; the solid-state polymer electrolyte with high mechanical property and high ionic conductivity is easy to obtain; and the solid-state polymer electrolyte has a wide application prospect in the aspect of a power lithium-ion battery car.

The invention relates to a preparation method of a low-porosity positive pole piece suitable for a solid-state battery and the solid-state lithium metal battery. The positive pole piece is composed ofan active material, a conductive agent, a binder (having lithium ion conduction capability) and a current collector, and is characterized in that the positive active material is primary particles orlarge single crystals, and the typical size of the positive active material is 50 nm to 30 [mu] m; the binder, the conductive agent and the current collector have a synergistic effect, so that the integrity of ions and electronic channels in the pole piece is guaranteed; and the porosity of the pole piece is less than 20%. The pole piece provides a transmission channel for ions and electrons, so that the pole piece is in good interface contact with solid electrolyte and is suitable for a solid-state lithium metal battery.

The invention discloses an energy-storing device with low internal resistance and a production method thereof. A certain blank margin is reserved for a current collector when an electrode plate of the energy-storing device is produced; a core cladding consists of a positive electrode plate, a negative electrode plate and a diaphragm; current collectors of a positive electrode and a negative electrode respectively extend out of two ends of the core cladding; and the current collectors of the positive electrode and the negative electrode of the core cladding of the energy-storing device are respectively welded on a positive electrode end plate and a negative electrode end plate which are provided with lead-out binding posts by adopting a wall-viewing welding process. The energy-storing device suitable for the method comprises a device for storing energy by using an electrochemical principle and a device for storing energy by using a physical principle, such as lithium ion battery, a super capacitor, a double electric layer capacitor, a capacity battery, a high-power battery and the like. The invention can greatly reduce the lead-out resistance of an electrode lug of the energy-storing device, improve the power performance, does not use a transitional electrode lug, further improves the utilization rate of an inner space of the energy-storing device and ensures that the volume power density and the volume energy density of the energy-storing device are higher; and compared with the riveting and crimping, the laser welding is beneficial to further improving the reliability of the device.

There is described a charge pump circuit (1) circuit comprising an input terminal, an output terminal (5) connected to an intermediate node (Ni), a ground terminal (4), a first fly capacitor module (21) with a first fly capacitor (Cfly1) having a first pin (211) and a second pin (212) and connected to the intermediate node (Ni); and a second fly capacitor module (22) with a first fly capacitor (Cfly2) having a first pin (221) and a second pin (222) and connected to the intermediate node (Ni); wherein each being adapted to successively charge and discharge a the first fly capacitor and the second fly capacitor, respectively, wherein the second pin (212) of the first fly capacitor module (21) is connected to the first pin (221) of the second fly capacitor module (22) by a direct connection.

The invention relates to a proton exchange membrane for a fuel cell, in particular to a combined self-humidifying proton exchange membrane for a self-humidifying fuel cell and a preparation method. The method comprises the steps of distributing loaded catalysts to organic solution of solid macromolecule electrolyte to form casting solution, then casting, coating, or tape casting are adopted to prepare the self-humidifying proton exchange membrane, or the casting solution is adopted with methods of casting, coating, or tape casting to be filled in a porous strengthening membrane to prepare theself-humidifying proton exchange membrane. The self-humidifying proton exchange membrane of the invention generates from non-electric short circuit in the whole membrane, and has the characteristics of good density, high proton conductivity, strong water retaining capacity, as well as low cost.

Disclosed is a raw material carbon composition which can be a carbon material for electrodes of electric double layer capacitors when activated. Such a raw material carbon composition is characterized by having a volatile content of not less than 1.3% by mass and not more than 15% by mass. The raw material carbon composition is further characterized by having a microstrength of 5-30% when the volatile content is less than 6% by mass while having a microstrength of a 5-20% when the volatile content is 6% by mass or more. The capacitance per unit volume of an electric double layer capacitor can be increased by using such a raw material carbon composition.

The invention discloses a formation method for a lithium ion battery. The method comprises the steps of carrying out formation on the lithium ion battery, after the lithium ion battery is filled with an electrolyte and is subjected to standing, at a temperature of 35-55 DEG C by 0.01-0.5C charging current under a vacuum-pumping condition. The method adopts high-temperature negative pressure for realizing formation; the exhaust gas generated from the internal of the battery in the formation process is exhausted in time; a uniform and stable SEI film is formed on the negative electrode of the lithium ion battery at a high-temperature environment; the battery processed by the formation method has the advantages of high capacity volatilization of active materials, low internal resistance, low expansion rate, long cycle life and long storage life, so that the product quality is improved, and the service life of the battery is prolonged; and meanwhile, the method has the advantages of short formation time, high equipment utilization ratio and low energy consumption, so that the method is an efficient formation method suitable for batch production of the lithium ion batteries.

There is provided a supercapacitor with a significantly reduced internal resistance. The supercapacitor comprises two electrodes in which each of the two electrodes is comprised of a current collector and an electrode active material adhered to the current collector, a separator positioned between the two electrodes, an electrolyte and a package, wherein the current collector is a metal thin plate having a conductive metal oxide layer thereon and the electrode active material is adhered on a surface of the conductive metal oxide layer. The supercapacitor according to the present invention has a significantly reduced internal resistance and a highly enhanced charge capacitance.

In a sealed battery, a metal current carrying block 24A having a protrusion 24b on each of the two opposing faces is placed between positive or negative electrode substrate exposed portions that are divided into two so as to bring the protrusion 24b on each of the two opposing faces into contact with the positive or negative electrode substrate exposed portions that are stacked, a pair of electrodes 31 and 32 for resistance welding are brought into contact with positive electrode collector members 16 or negative electrode collector members that are each placed on the outermost surfaces of the positive electrode substrate exposed portions 14 or negative electrode substrate exposed portions, and resistance welding is performed with pressure applied between the pair of electrodes 31 and 32 for resistance welding.

The invention discloses a perovskite solar cell and a manufacturing method of the perovskite solar cell. The perovskite solar cell is provided with a conducting glass conducting layer, a barrier layer, a mesoporous layer, a counter electrode layer and a perovskite light-absorbing layer. The conducting glass conducting layer is divided into a positive electrode region and a negative electrode region by a piece of insulating tape, the positive electrode region of the conducting glass conducting layer is coated with the barrier layer, the mesoporous layer is located on the barrier layer, the mesoporous layer, the insulating tape and the positive electrode region of the conducting glass conducting layer are covered with the counter electrode layer, and the outer surface of the counter electrode layer is coated with the perovskite light-absorbing layer. The low-cost screen printing technology is fully utilized, the production process is simple, the energy consumption of the low-cost screen printing technology is much lower than that of the evaporation coating technology, and the manufacturing method of the perovskite solar cell is beneficial for large-scale production and has broad application prospects.

The invention relates to a solid-state battery and a preparation method thereof. The solid-state battery comprises a positive electrode, a negative electrode and a solid-state electrolyte membrane compounded between the positive electrode and the negative electrode, wherein the positive electrode comprises a positive electrode current collector and a positive electrode material layer coated on thepositive electrode current collector, the positive electrode material layer contains a positive electrode material and a binder, and the binder is a polymer electrolyte; the electrolyte membrane comprises an inorganic electrolyte layer attached to the positive electrode and a polymer electrolyte layer attached to the negative electrode, and the inorganic electrolyte layer contains an inorganic solid-state electrolyte and a polymer electrolyte. According to the solid-state battery provided by the invention, on the basis of using the composite electrolyte membrane, the polymer electrolyte is used as the binder in the positive electrode material layer and the inorganic electrolyte layer, and the polymer electrolyte has lithium ion conductivity, so that the improvement of a conductive networkof the positive electrode material layer is facilitated, and the compatibility of the positive electrode and the inorganic electrolyte membrane is improved, thereby being capable of effectively reducing the internal resistance of the battery, and promoting the improvement of the overall performance of the battery.

The invention provides a lithium iron phosphate composite positive electrode material with a surface coated with titanium nitride and graphene, a preparation method of the material and an application of the material in preparation of a lithium ion battery. According to the lithium iron phosphate composite positive electrode material, a lithium iron phosphate material is used as an inner core; the surface of the lithium iron phosphate material is coated with a conductive network film which consists of titanium nitride and graphene; and the mass of the conductive network film is 0.2%-10% of the mass of the lithium iron phosphate material. The preparation method of the material comprises the following steps: uniformly mixing the lithium iron phosphate material with graphene, a nitride source and a titanium-containing compound in a dispersion medium to prepare a mixed material, drying the mixed material, subsequently sintering the mixed material at 400 DEG C to 900 DEG C for 6-24 hours in the presence of inert protective atmosphere so as to prepare the lithium iron phosphate composite positive electrode material with the surface coated with titanium nitride and graphene. The lithium iron phosphate composite positive electrode material is relatively high in conductivity and tap density and relatively good in rate capability and cycle performance; and the preparation method is simple in steps, low in cost and simple to operate.

The invention discloses a high-multiplying-power flexibly-packaged lithium ion secondary battery. The high-multiplying-power flexibly-packaged lithium ion secondary battery comprises an outer packaging film, wherein a positive plate, an isolation film, a negative plate and electrolyte are arranged in the outer packaging film, the positive plate comprises an aluminum foil, the surface of the aluminum foil is provided with a positive material layer consisting of positive active substances, a conductive agent and a binder, the positive active substances consist of lithium cobalt oxide and lithium iron phosphate in different working voltages, the aluminum foil is provided with a plurality of positive through holes, the positive substance layer is provided with a plurality of positive pores corresponding to the through holes, and the electrolyte can pass through the positive through holes and the positive pores; the negative plate comprises a copper foil, wherein the surface of the copper foil is provided with a negative substance layer consisting of a negative active substance, a conductive agent and a binder, the negative active substance is a carbon material, the copper foil is provided with a negative through holes, the negative substance layer is provided with a plurality of negative pores corresponding to the through holes, and the electrolyte can pass through the negative through holes and the negative pores.

The invention provides a method for preparing a composite pitch-based activated carbon. In the invention, graphene oxide and pitch coke are reduced and activated through high-temperature coking, and graphene oxide forms a uniform network inside the pitch coke; at the same time, after high-temperature activation and high-temperature Reduction, graphene oxide removes most of the oxygen to form graphene, so that a good conductive network is formed inside the activated carbon and the internal resistance of the activated carbon is reduced. The preparation method provided by the present invention effectively solves the problem that the existing activated carbon is mainly composed of micropores, the pore size distribution is unreasonable, the proportion of alkali used in the preparation process is relatively high, and the performance of activated carbon still cannot meet the requirements for capacity and internal resistance. Big question. The composite pitch-based activated carbon prepared by the invention has the advantages of reasonable pore size distribution, large specific surface area, low internal resistance, high capacity, low impurities and low oxygen-containing functional groups, and can be used as supercapacitor carbon to obtain supercapacitors with better performance.

The invention discloses a preparation method of an integrated electrode composite material. The method comprises the following steps of obtaining a porous cellulose network structure from wood, then filling a multi-walled carbon nanotube into the cellulose network structure, and carrying out aniline in-situ polymerization to obtain the cellulose network/multi-walled carbon nanotube/polyaniline integrated electrode composite material. According to the integrated flexible super capacitor prepared from the material, the area specific capacitance can reach 0.71 Fcm <-2 >, when the power density is15.67 mW/cm < 2 >, the energy density is 0.83 mWh/cm < 2 >, and the retention rate of the area specific capacitance can reach 103.24% after 10000 times of charging and discharging cycles, so that theelectrochemical performance of the flexible super capacitor is obviously superior to that of an existing biomass-based flexible super capacitor.

The invention discloses colloidal electrolyte for a lead-acid storage battery. The electrolyte is composed of the following components in percentage by weight: 40-48 percent of sulfuric acid, 7-15 percent of nano gas-phase silicon dioxide, 0.3-5 percent of sodium sulfate, 0.5-5 percent of hydroxypropyl methyl cellulose, 0.07-0.15 percent of acrylamide, 0.01-0.05 percent of polyethylene glycol, 0.01-0.04 percent of vanillin, 0.01-0.18 percent of soft soap, and the balance of pure water. By utilizing the colloidal electrolyte, the problems that the colloidal electrolyte prepared by utilizing common colloidal silica has poor thixotropy, is easy to hydrate, is rapid to age and is easy to dry are solved. The storage battery filled with the colloidal electrolyte has the advantages of good thixotropy, low internal resistance, low self-discharge, strong high-current discharging capacity and good low temperature resistance, and the capacity and cycle life of the battery are improved.

A formation method of a lithium ion battery comprises the following steps of placing a battery cell of which aging is finished in a device for high-temperature pressurized formation, wherein the charging cutoff voltage is 3.5-3.8V; cooling the battery cell under a room temperature and a fixed pressure to make the temperature of the battery cell reduced to a room temperature; placing the cooled battery cell in a vacuum environment, puncturing an air bag of the battery cell, pumping air, and sealing; placing the battery cell of which air pumping is finished in a formation device for high-temperature pressurized formation, wherein the charging cutoff voltage is 3.9-4.5V; and cooling the battery cell under a room temperature and a fixed pressure to make the temperature of the battery cell reduced to the room temperature, and finishing formation. According to the formation method, the steps of puncturing the air bag and pumping air are added during hot-press formation, reaction gas can be timely eliminated, and thus, the internal resistance of the battery cell is effectively reduced; and with the two steps of high-pressure room-temperature cooling, the hardness of the lithium battery can be improved, the flatness of the battery cell is improved, and the performance of the lithium battery is improved.

The invention provides a lithium secondary battery electrolyte. The preparation method comprises the following steps: adding polyfluorophosphate with a specific structure and a non-aqueous solvent into LiPF6 electrolyte lithium salt, and performing reasonable mixing to obtain the electrolyte. The lithium secondary battery using the electrolyte can have good thermal stability and chemical stabilityin the high-rate charging and discharging process, and meanwhile, has low internal resistance, good low-temperature performance and long cycle life.

The invention provides a thin-film solar cell. Electrode grooves are formed in a low-resistance window layer, and collection electrodes are deposited in the electrode grooves respectively. On the premise that the thickness of a buffer layer and the thickness of a high-resistance window layer are large enough so that the density of a film layer of the thin-film solar cell can be ensured, the photon-generated carrier recombination probability of an interface can be effectively lowered. Due to the fact that the collection electrodes are arranged in the electrode grooves respectively, the thickness of the portions, in the perpendicular direction of the contacting areas of the collection electrodes and the electrode grooves, of the high-resistance window layer can be reduced, the internal resistance of the solar cell can be effectively reduced, the output power of the solar cell can be improved, meanwhile, the contact area between the collection electrodes and a transparent window layer composed of the high-resistance window layer and the low-resistance window layer is increased, the collection rate of the collection electrodes for photon-generated carriers is improved, and the output power of the thin-film solar cell is further improved. In addition, a method for preparing the thin-film solar cell is simple in process and allows large-scale industrial production to be easily achieved.

This invention relates to a polymer having a chain structure of a repeating unit of a proton-conducting compound which causes an electrochemical redox reaction in a solution of a proton source to act as an electrode active material, and a heterocyclic compound structure; and an electrochemical cell comprising the polymer as an electrode active material.