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

Lithium ion capacitor and fabrication method thereof

ActiveCN105551815AReduce the complexity of the mixing processLower internal resistanceHybrid capacitor electrodesPhysicsLithium-ion capacitor
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.
Owner:QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI

Modification method of single-crystal ternary positive electrode material

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.
Owner:宜宾锂宝新材料有限公司

Preparation method of lead crystal carbon storage battery

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.
Owner:宁波中科孚奇能源科技有限公司

Energy-storing device with low internal resistance and production method thereof

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.
Owner:CHAOYANG LIYUAN NEW ENERGY

Solid-state battery and preparation method thereof

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.
Owner:郑州宇通集团有限公司

Lithium iron phosphate composite positive electrode material with surface coated with titanium nitride and graphene as well as preparation method and application of material

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.
Owner:CHANGSHA SAIWEI ENERGY TECH

High-multiplying-power flexibly-packaged lithium ion secondary battery and preparation method thereof

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.
Owner:中山市电赢科技有限公司

Composite asphalt-based active carbon preparation method and supercapacitor

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.
Owner:SHANDONG OBO NEW MATERIAL CO LTD

Formation method of lithium ion battery

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.
Owner:ZHUHAI COSMX BATTERY CO LTD

Thin-film solar cell and method for preparing same

InactiveCN103474488AReduce chance of recombinationLower internal resistanceFinal product manufacturePhotovoltaic energy generationHigh resistanceThin film solar cell
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.
Owner:DONGTAI HI TECH EQUIP TECH (BEIJING) CO LTD
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