51results about How to "Reduce polarization" patented technology

The invention discloses a low-temperature-resistant negative electrode zinc paste and a low-temperature alkaline zinc-manganese battery containing the zinc paste. The negative electrode zinc paste comprises the following components in parts by weight: 60-65 parts of zinc powder, 1-2 parts of a composite conductive agent, 0.1-0.3 part of a composite corrosion inhibitor and 35-38 parts of a low-temperature electrolyte; the low-temperature electrolyte comprises a multi-element nonionic surfactant system, a multi-element nano anti-freezing agent system and a mixed solution A, the 3.9 ohm discharge capacity of the battery under the condition of-40 DEG C is larger than or equal to 60% compared with the capacity retention rate at normal temperature, the interface impedance amplification is smaller than or equal to 15%, the hydrogen evolution amount is reduced by 80% on year-on-year basis, the process is compatible with an existing production line, and the battery is suitable for polar scientific investigation and electronic equipment in plateau and cold regions.

The present application relates to the technical field of electrochemistry, and in particular to a fast-charging numerical simulation method, device and medium for thick electrodes of lithium ion batteries, the method comprising: constructing an electrochemical model of a lithium ion battery based on a pseudo two-dimensional model; loading basic parameters of the lithium ion battery, spatially discretizing according to the battery structure, and initializing an array of physical quantities required for simulation; using a Bayesian optimization algorithm, determining the charge-discharge curve of the lithium ion battery based on experiments, and calibrating the kinetic parameters of the battery cell; switching the charge-discharge mode according to the state of the lithium ion battery, performing cycle simulation, outputting simulation data, and completing fast-charging numerical simulation. The method overcomes the problems of the prior art, such as the inability of the pseudo two-dimensional model to accurately simulate the low-temperature fast-charging process of thick electrodes, the lack of an efficient and accurate method for obtaining kinetic parameters, and the difficulty in predicting battery aging caused by SEI growth.

The invention provides a preparation method of a high-compaction high-capacity lithium iron phosphate material, which comprises the following steps: (1) mixing polyvinyl alcohol, iron phosphate, a lithium source, a carbon source and water to obtain slurry A; mixing iron phosphate, a lithium source, a carbon source and water to obtain slurry B; (2) performing spray drying on the slurry A, and performing low-temperature sintering to obtain a black material C; performing spray drying on the slurry B, and performing high-temperature sintering to obtain a black material D; and (3) mixing the black material C and the black material D, crushing, adding barium titanate, carrying out ball milling, and drying to obtain the lithium iron phosphate material. The polyvinyl alcohol is partially acetylated modified polyvinyl alcohol. The sintering temperature is reduced by adding the modified polyvinyl alcohol to prepare the compact lithium iron phosphate material with smaller particle size, and the lithium iron phosphate material and the lithium iron phosphate material obtained by high-temperature sintering form grading of large and small particles, so that the compaction density of the lithium iron phosphate is improved.

This invention belongs to the field of composite material technology, specifically disclosing a high-dielectric-constant, low-dielectric-loss polyphenylene sulfide composite material, its preparation method, and its applications. The composite material comprises the following components in parts by weight: 100 parts of polyphenylene sulfide matrix, 10-60 parts of high-dielectric-constant nanofiller, 0.5-8 parts of metal nanoparticles, and 0.5-5 parts of surface modifier. This invention utilizes the aforementioned high-dielectric-constant, low-dielectric-loss polyphenylene sulfide composite material, its preparation method, and its applications. The composite material exhibits a high dielectric constant and achieves low dielectric loss. It also enhances its mechanical strength and toughness, enabling the composite material to maintain its electronic properties while possessing excellent physical properties.

The invention provides a graphene / activated carbon composite material and a preparation method and application thereof, and belongs to the technical field of nano materials, the graphene / activated carbon composite material comprises a carbon matrix and a two-dimensional sheet material covering the carbon matrix; the carbon matrix is an activated carbon material and is a carbon material prepared by performing high-temperature pyrolysis on magnesium citrate in a high-temperature self-propagating reaction process; the two-dimensional sheet material is a graphene material and is a few-layer carbon material which is prepared by converting CO2 through a high-temperature self-propagating reaction and is formed by arranging carbon atoms according to a honeycomb-shaped two-dimensional lattice. According to the invention, graphene is used as a conductive and structural dual skeleton; and a hierarchical pore structure is constructed by utilizing gas production and template effect in the reaction process, so that the electrochemical performance of the active carbon positive electrode is improved. And a proper amount of graphene can provide more active sites and maintain the structural stability at the same time, so that the specific capacity and the cycle life are remarkably improved and prolonged, and the material has a wide application prospect and is particularly suitable for preparing a high-performance lithium ion capacitor positive electrode material.

The application provides a lithium-rich lithium-iron material, a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium-rich lithium-iron material comprises a core and a coating layer coated on the surface of the core. The material of the core is lithium-rich lithium-iron doped with a first doping element, and the material of the coating layer is carbon material doped with a second doping element. The first doping element comprises at least one of Ti, W, Ni, Ce and Co, and the second doping element comprises at least one of B, N, S, O and P. The lithium-rich lithium-iron material is used as a lithium supplement in a battery, so that the capacity of the battery can be further improved and the gas production amount can be reduced.

The application relates to the technical field of battery materials, and discloses a sodium-philic carbon-based material, a negative-electrode-free current collector, a preparation method of the sodium-philic carbon-based material and a sodium metal battery. The preparation method of the sodium-philic carbon-based material comprises the following steps: providing a mixed solution, wherein the mixed solution comprises carbon source powder, an iron source and a solvent; fully reacting the mixed solution in a protective atmosphere at 160-240 DEG C; obtaining a carbon-loaded sodium-philic material after solid-liquid separation; fully calcining the carbon-loaded sodium-philic material in an inert atmosphere at 700-900 DEG C to obtain a porous sodium-philic precursor; and treating the porous sodium-philic precursor in a reaction gas atmosphere at 400-700 DEG C for 1-3 hours to obtain the sodium-philic carbon-based material. The reaction gas atmosphere is an ammonia gas and inert gas mixed atmosphere or an ammonia gas atmosphere. The material is coated on the surface of the negative-electrode-free sodium metal battery current collector, and can enhance the electrochemical performance of the battery.

The utility model discloses a novel pump body structure which comprises a coil assembly, a fixing seat is arranged at the top of the coil assembly, a cylindrical pipe is arranged at the bottom of the fixing seat in an extending mode, and the cylindrical pipe penetrates through the center of the coil assembly and is clamped and positioned with the bottom of the coil assembly. A plurality of claw buckles are evenly arranged on the edge of the periphery of the lock cover, locking grooves correspondingly connected with the claw buckles in a clamped mode are formed in the fixing base, the top ends of the locking grooves extend upwards to be higher than the top surface of the fixing base, and the locking grooves are designed in the top of the fixing base in a lifting mode, so that the whole locking grooves are higher than the top surface of the fixing base. When the claw buckle is mounted, the assembling is more labor-saving and faster; the reset spring is integrally arranged on the movable iron core in a sleeving manner; polarization reduction of the movable iron core is realized; the friction between the movable iron core and the inner wall of the cylindrical pipe is reduced, so that the power loss of the pump body is reduced.

The invention discloses a silicon negative electrode active material which sequentially comprises a silicon-based material inner core, a flexible solid electrolyte or gel electrolyte middle layer and a carbon-coated outer layer from inside to outside, the flexible solid electrolyte or gel electrolyte middle layer comprises a conductive agent, and the conductive agent comprises a carbon nanotube. According to the silicon negative electrode active material, the surface of the silicon-based material is coated with the flexible solid-state or gel-state electrolyte, so that the volume change of the negative electrode active material in the charging and discharging process is effectively relieved, the electrolyte is isolated, the stability of the negative electrode active material is improved, and the negative electrode active material has relatively high reversible specific capacity and relatively high specific surface area; and excellent long cycle performance is shown.

The invention belongs to the technical field of optical devices, and discloses a high-polarization dustproof plate for a vehicle-mounted HUD (Head Up Display) and a preparation method of the high-polarization dustproof plate. The polarization dustproof plate comprises a polarization element sub-layer, a first optical compensation layer and a second optical compensation layer, wherein the polarization element sub-layer is clamped between the first optical compensation layer and the second optical compensation layer; wherein the first optical compensation layer and the second optical compensation layer are both polycarbonate films, and the compensation value Re of the polycarbonate films meets the following relational expression: Re < = 50nm or Re > = 3000nm; the polarizer layer is a polyvinyl alcohol polarizing film, and the degree of polarization of the polyvinyl alcohol polarizing film is larger than or equal to 99%. The optical compensation layers with low compensation value or high compensation value functions are arranged on the two sides of the polarization element sub-layer, and the polarization element sub-layer with high polarization degree is adopted, so that the problems of rainbow lines and ghosting are solved, glare and reflection are reduced, the display definition is improved, and the application requirement of large-size HUD projection display can be met.

The application provides a cation exchange membrane and a preparation method and application thereof, and belongs to the technical field of cation exchange membranes.The method provided by the application is free of volatile organic compounds, toxic and harmful monomers or heavy metal components, and the raw material itself is environmentally friendly.The method is free of harmful gas emission and hazardous waste generation, and is environmentally friendly.The cation exchange membrane material prepared by the method is chemically stable, easy to recycle after being discarded, free of additive precipitation during use, and free of pollution to the treatment system.The water-soluble dispersion bonding medium adopted by the application forms rich and uniform connected pore structures in the cation exchange membrane after being washed by water, greatly reduces ion migration resistance, significantly alleviates membrane polarization, and improves ion exchange rate and energy utilization efficiency when used for separation.The method provided by the application is free of complex chemical reactions, harsh process conditions, and standardized operation steps, and is easy to realize large-scale continuous production.

The application relates to a secondary battery and a power consumption device, and belongs to the technical field of batteries. The secondary battery comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole current collector and a positive pole active layer arranged on the surface of the positive pole current collector, the positive pole active layer comprises a positive pole active material; the negative pole piece comprises a negative pole current collector and a negative pole active layer arranged on the surface of the negative pole current collector, the negative pole active layer comprises a negative pole active material; and the secondary battery satisfies 0.14<=Z<=4.67; wherein Z=(n1 / n2)*(p1 / p2). The secondary battery can maintain high energy density, and has good fast charging performance and long cycle life.

The invention discloses a lithium ion battery charging control method, which comprises the following steps: S1, carrying out an electrochemical impedance spectroscopy test on a battery, and determining the maximum pulse discharge duration through the electrochemical impedance spectroscopy test; s2, charging the battery to be charged to a preset SOC; s3, performing pulse discharge on the battery by adopting the NC discharge current within the maximum pulse discharge duration, and after the pulse discharge is completed, charging the battery by adopting the MC charge current until the battery is charged to a preset cut-off voltage; and S4, repeating the step S3 until the SOC of the battery reaches the target SOC.

This invention relates to a battery charging method and system, belonging to the field of battery charging technology. It includes a constant current charging stage and a constant voltage charging stage. The battery charging method includes: obtaining the highest temperature T1 during the constant current charging stage; calculating the target control temperature T2 of the battery during the constant voltage charging stage, the calculation formula for the target control temperature being: [formula missing], where [value missing] is a trade-off parameter between charging speed and cell temperature, 0 < [value missing], and [value missing] is the current charging ambient temperature; when the battery is in the constant voltage charging stage, the temperature of the cell is controlled so that the cell temperature T satisfies the following relationship: T2 ≤ T ≤ T1. This invention increases the average temperature of the cell during the constant voltage charging stage by heating the cell, reduces cell polarization, increases the charging current during the constant voltage charging stage, and improves the charging speed.

This invention relates to a method for preparing a vanadium selenide / vanadium oxide heterojunction photo-assisted zinc-ion battery, belonging to the technical field of vanadium selenide / vanadium oxide heterojunction photo-assisted electrochemical energy storage and zinc-ion battery. The method includes the following steps: mixing a selenium source solution and a vanadium source solution to obtain a reaction precursor solution; subjecting the reaction precursor solution to a hydrothermal reaction and washing to obtain vanadium selenide material; annealing the vanadium selenide material to form a vanadium oxide layer on its surface, obtaining a vanadium selenide / vanadium oxide heterojunction composite material; mixing the vanadium selenide / vanadium oxide heterojunction composite material, a conductive agent, and a binder, adding a solvent to prepare a slurry, coating the slurry onto the surface of a current collector, and drying to obtain a photocathode. The material and its application system described in this invention exhibit good specific capacity, rate performance, and cycle stability, and demonstrate good energy storage performance under illumination conditions; this invention is beneficial for further reducing electrode polarization and promoting the synergistic enhancement of electron transport and zinc-ion storage.

This invention relates to the field of batteries, and more particularly to a positive electrode material, a method for preparing the same, and a battery. The positive electrode material includes a core and a coating layer covering at least a portion of the surface of the core; the core has the general chemical formula Na3V. 1.925 M 0.075 (PO4)3, where M is a transition metal element; the coating layer includes carbon materials, which include nitrogen-doped amorphous carbon and carbon nanotubes introduced by acidified carbon nanotubes. The cathode material provided by this invention can significantly improve the low-temperature, high-rate, and long-cycle electrochemical performance. Thanks to the synergistic effect of structural optimization and interface regulation, the polarization of the material is significantly reduced under low-temperature and high-current charge-discharge conditions, and the rate performance and cycle stability are significantly improved, enhancing the practicality and reliability of sodium-ion batteries in large-scale energy storage and wide-temperature applications.

The application provides a polarization current elimination method and a charging circuit. The polarization current elimination method comprises the following steps: when a power battery is fast-charged based on a preset power, it is detected whether a first signal is received; when the first signal is received, the power battery is controlled to perform negative pulse discharge, so as to input a negative pulse current to a target load, wherein the first signal is generated when a polarization value of the power battery reaches a starting depolarization function threshold; when a second signal is received, the power battery is controlled to stop inputting the negative pulse current to the vehicle-mounted motor or the load, and the second signal is generated when the polarization value of the power battery reaches an exiting depolarization function threshold. The application can reduce the polarization degree of the battery, thereby improving the safety of the battery and prolonging the service life of the battery in a large-power fast-charging scene. Meanwhile, the application can reduce the polarization degree of the battery without the need of increasing an additional capacitor to reduce the polarization degree of the battery, and therefore, the application also has the advantage of lower cost.

The invention relates to a titanium dioxide negative pole piece, a preparation method thereof and an aqueous lithium ion battery, and belongs to the field of electrochemical materials. And at least one of the problems of low conductivity, easy agglomeration of nano-particles, poor rate capability caused by serious hydrogen evolution in an aqueous battery, fast cycle capacity fading and the like of the negative plate in the aqueous lithium ion battery in the prior art is solved. The preparation method of the titanium dioxide negative pole piece comprises the following steps: performing electrochemical expansion treatment on graphite paper to obtain expanded graphite paper; carrying out fluorination treatment on the expanded graphite paper; loading titanium dioxide on the fluorinated expanded graphite paper to obtain an active precursor; and combining the active precursor with a current collector to obtain the titanium dioxide negative pole piece. By improving the conductivity of the negative plate, the phenomena of nanoparticle aggregation and hydrogen evolution are reduced, and the rate capability and the cycle capacity retention ratio of the aqueous lithium ion battery are improved.

This invention discloses a method for preparing carbon-coated lithium titanium phosphate anode material, comprising the following steps: sequentially mixing water, a lithium source, a phosphorus source, a titanium source, a carbon source, and a dispersant, stirring to obtain a mixture; and sequentially subjecting the mixture to sand milling, drying, and heat treatment to obtain carbon-coated lithium titanium phosphate material. The preparation method of this invention is simple, efficient, and easy to operate. The carbon-coated lithium titanium phosphate material prepared reduces the polarization phenomenon of lithium titanium phosphate, thereby improving the battery capacity and cycle stability.

The application discloses a composite material and a preparation method and application thereof. The composite material comprises: a porous carbon skeleton, wherein nano red phosphorus is attached in the porous carbon skeleton; and a carbon coating layer, which is coated on the surface of the porous carbon skeleton. According to the composite material of the first aspect of the application, the following beneficial effects are achieved: the porous carbon skeleton has a large number of pores, which can effectively solve the volume expansion problem of the nano red phosphorus attached therein, shorten the electron transmission distance, accelerate the electron transfer and the embedding and stripping of cations therein and the transmission between the electrode and the electrolyte interface. The outer carbon coating layer can isolate the nano red phosphorus in the carbon skeleton and the phosphorus salt generated in the working state from direct contact with the electrolyte, thereby avoiding the occurrence of side reactions; the carbon coating layer can also improve the conductivity of the material, reduce the polarization and ensure the stability of the electrode structure. Therefore, the composite material as a negative active material can bring excellent cycle performance.

This invention provides a non-aqueous electrolyte, a lithium-ion battery, a battery module, a battery pack, and an electrical device. The non-aqueous electrolyte comprises a lithium salt, an organic solvent, and electrolyte additives. The electrolyte additives include 1,3-propanesulfonate lactone, fluoroethylene carbonate, vinylene carbonate, lithium tetrafluoroborate, and compounds represented by Formula I. Formula I. The non-aqueous electrolyte of this invention is applied to lithium-ion batteries to improve their cycle life.

The invention discloses a self-breathing type high-performance zinc air battery and a manufacturing method thereof, and the method comprises the following steps: preparing a La1-ySryMnO3-Mn3O4-porous carbon composite catalyst (y = 0.6-0.9) based on a one-pot method, and forming an extremely thin planar air electrode with the thickness of 0.35-0.55 mm by adopting a spraying method in combination with a cold pressing process; preparing the obtained planar air electrode into a cylindrical structure and then forming a flat-bottom U-shaped air positive electrode, putting a cylindrical diaphragm into the air positive electrode, injecting zinc negative electrode paste into the cylindrical diaphragm, and then inserting a negative electrode current collector with multiple layers of coaxial structures; the prepared air electrode is high in reaction activity and low in polarization potential; the cylindrical No.1 zinc air battery which is large in capacity (37Ah, working current 500mA), high in specific energy density (greater than 400W / kg) and capable of continuously and stably working under large current (2-5A) is developed by the method, and large-scale production of the high-performance LR20 type zinc air battery is facilitated.

The invention relates to the technical field of batteries, in particular to an all-solid-state battery and a preparation method thereof.The all-solid-state battery comprises a positive plate, a negative plate and a solid electrolyte layer located between the positive plate and the negative plate; the negative plate comprises a negative current collector and a negative layer positioned on at least one side surface of the negative current collector; the positive plate comprises a positive current collector and a positive layer positioned on at least one side surface of the positive current collector; the functional surface on one side of the solid electrolyte layer is combined with the positive electrode layer to form an integrated structure, and the functional surface on the other side of the solid electrolyte layer is combined with the negative electrode layer to form an integrated structure; the negative electrode layer comprises nano silver powder, and the nano silver powder has a honeycomb hollow structure; the solid electrolyte layer includes an oxide electrolyte. According to the all-solid-state battery, the interface impedance is greatly reduced, the rate capability of the battery is improved, the all-solid-state battery can adapt to the volume change of the pole piece in circulation, and the cycle life of the battery is prolonged.

The application discloses a preparation method of single-atom modified porous carbon material and application of the single-atom modified porous carbon material in lithium-sulfur batteries. The preparation method comprises the following steps: preparing zinc-based metal organic framework material Zn-MOF nanoparticles; coating phenolic resin (RF) on surfaces of the Zn-MOF nanoparticles to obtain Zn-MOF-RF nanoparticles; adsorbing X metal salt on the Zn-MOF-RF nanoparticles by using a solution immersion method; and obtaining X single-atom loaded hollow nitrogen-doped porous carbon (X-N / HNPC) composite material by high-temperature carbonization under an inert atmosphere. The composite material has a large specific surface area and rich pore size structure, and as a positive electrode material, can not only improve the utilization rate of active material sulfur, but also effectively adsorb polysulfides by high catalytic active sites, improve redox reaction kinetics, and further inhibit the shuttle effect of polysulfides. Based on the lithiumophilicity of metal single atoms, as a lithium negative electrode carrier, the lithium uniform deposition can be regulated, the growth of lithium dendrites can be relieved, and the stability of the battery can be improved.

The invention discloses an aqueous zinc-iodine battery electrolyte additive, an electrolyte preparation method and an aqueous zinc-iodine battery preparation method, 3-chloro-2-hydroxypropyl trimethyl ammonium chloride is used as a multifunctional electrolyte additive, and reversible four-electron conversion reaction is realized by synergistically regulating and controlling a zinc ion solvation structure and stable iodine positive ions, so that the zinc-iodine battery electrolyte additive is obtained. The energy density and the cycling stability of the water-based zinc-iodine battery are greatly improved, and dendritic crystal generation and side reaction can be inhibited. The electrolyte is composed of ZnSO and CHPTAC, and the pH value of the electrolyte is 5-6. The positive electrode of the iodine battery adopts a current collector-free structure, and a self-supporting electrode is prepared by compounding iodine and activated carbon and combining with carbon nanotube slurry. The zinc-iodine total battery constructed by the electrolyte and the iodine positive electrode has remarkable performance advantages.

Provided is an X-ray detector having a driving sequence in which a standby section, a preparation section, an accumulation section, and a readout section are repeated, the X-ray detector comprising: a first electrode on a substrate to which a pixel voltage is applied; a photoelectric material layer on the first electrode; and a second electrode on the photoelectric material layer, in which a switching voltage equal to or less than the potential of the pixel voltage is applied to the second electrode during at least a part of the period of the preparation section, and a bias voltage is applied between the preparation section and the next preparation section.

The invention provides a resin composition, application of the resin composition in preparation of a copper-clad plate and the copper-clad plate, and relates to the technical field of copper-clad plate preparation, and the resin composition comprises the following raw materials: hydroxyl-modified low-molecular-weight polyphenyl ether, bismaleimide resin, a trifluoromethyl-containing bifunctional isocyanate cross-linking agent, a filling material and an initiator. A fluorine-containing polyurethane cross-linked network is constructed by introducing a trifluoromethyl-containing bifunctional isocyanate cross-linking agent, so that the water absorption and dielectric loss of the material are reduced, the dielectric stability after damp and hot is improved, and the heat resistance, dimensional stability and comprehensive reliability of a cured product are improved; therefore, the application requirements of high-frequency and high-speed copper-clad plates, antennas / radars and millimeter wave device materials are met.

This invention provides a thick electrode, its preparation method, and its applications. The thick electrode includes a current collector and at least two electrode layers located on the surface of the current collector. An electrospun layer is disposed between the electrode layers. The active material in the electrode layer closer to the current collector surface is a large-particle-size active material, while the active material in the electrode layer farther from the current collector surface is a small-particle-size active material. This invention improves the electrode loading and thickness by designing at least two electrode layers and optimizing the particle size distribution of the main active material in each layer, thereby increasing the specific capacity and energy density of the battery. Simultaneously, the electrospun layer connects the electrode layers, creating a porosity gradient distribution along the direction perpendicular to the electrode, constructing efficient ion diffusion and conduction channels and electron transport channels. This results in good ion diffusion and conduction, reduces polarization during charging and discharging, and ensures high energy density and power performance of the battery.

The utility model discloses a cleanable depolarization film which comprises a substrate, a first protective film layer made of aluminum oxide is plated on the substrate, a depolarization film layer is plated on the first protective film layer, an anti-dazzle film layer is plated on the depolarization film layer, and a second protective film layer made of aluminum oxide is plated on the anti-dazzle film layer. The depolarization film solves the problems that an existing depolarization film is easy to clean, damage and oxidize, and the light splitting performance is affected, through the depolarization film layer, the light splitting performance is improved, meanwhile, the polarization degree of light is reduced, and through the anti-oxidation film layer, invasion of oxygen molecules is effectively blocked, so that the light splitting performance is improved. An internal film layer is prevented from oxidation reaction, so that the service life of the product is prolonged.