15results about How to "Reduce interface resistance" patented technology

The application provides a pore-forming agent for lithium ion batteries and a preparation method thereof, which comprises a wall material preparation step, a core material preparation step, a W / O type initial milk preparation step and a pore-forming agent for lithium ion batteries preparation step. The pore-forming agent preparation method is a new pore-forming agent synthesis route, which has the advantages of simple reaction steps, mild reaction conditions, high yield, low cost and environmental protection. The technology can accurately construct a uniform multi-level pore network by introducing the pore-forming agent into the electrode, significantly reduces the charge transmission impedance, effectively improves the fast charging capacity and high-rate discharge performance of the battery, greatly improves the electrode-electrolyte interface contact, and ensures the full use of the active material. The application also provides an application of the pore-forming agent for lithium ion batteries to lithium ion batteries. The application of the pore-forming agent for lithium ion batteries to the lithium ion batteries can improve ion conduction and improve the rate performance.

The application relates to a fluorinated two-dimensional inorganic nanofiller reinforced PEO-based solid-state polymer electrolyte and a preparation method and application thereof, and comprises the following steps: S1, obtaining fluorinated two-dimensional inorganic nanofillers by treating two-dimensional inorganic materials with a mixed gas of fluorine and nitrogen; S2, dissolving polyethylene oxide and a lithium salt in a polar solvent, then adding the fluorinated two-dimensional inorganic nanofillers obtained in the step S1, mixing, and obtaining a uniform mixed polymer solution; and S3, pouring the mixed polymer solution obtained in the step S2 on a polytetrafluoroethylene mold, vacuum drying, and obtaining the PEO-based solid-state polymer electrolyte. Compared with the prior art, the preparation process is simple and easy to operate, the ionic conductivity of the polymer electrolyte based on the fluorinated two-dimensional inorganic nanofillers can be improved, the electrochemical stability window can be widened, and the interface stability between the electrolyte and a lithium metal electrode can be improved.

The invention provides an in-situ polymerized lithium iron phosphate-bright aluminum foil composite positive electrode and a preparation method thereof, and relates to the field of lithium batteries. According to the positive electrode slurry, the functional additive A and the functional additive B are adopted for compatibility, and the additive B is a compound of which the molecular structure simultaneously contains polymerizable carbon double bonds and phosphate groups and is used for linking an inorganic surface and an organic polymer; the functional additive A and the functional additive B are compatible to construct a three-dimensional stable chemical bonding network, and a dynamic gradient conductive interface layer with high conductivity and strong binding power is constructed on the surface of the optical aluminum foil in situ, so that the risk that an active material falls off from a current collector in the later period of circulation is greatly reduced, and the interface resistance is remarkably reduced; the mechanical stability of the pole piece is remarkably improved (the interface bonding strength can still be kept at 90% after 1000 times of circulation), and the cycle life is long.

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 relates to a pole piece and a battery cell, and relates to the technical field of batteries.The pole piece comprises a current collector, a first conductive layer and an active body.The current collector is provided with a plurality of first holes.The first conductive layer comprises a first conductive part and a second conductive part.The first conductive part is arranged on at least one side of the current collector, and the second conductive part is filled into the plurality of first holes.The second conductive part is electrically connected with the first conductive part.The active body is arranged on the side of the first conductive part away from the current collector.The pole piece and the battery cell can reduce the interface resistance, improve the problem that the transmission path of electrons is blocked, and improve the transmission efficiency of the electrons.

The application discloses a preparation method of an ionic hydrogel-based humidity generator for efficient power generation and self-powered sensing. By preparing an ionic hydrogel prepolymer solution rich in active functional groups, a pre-polymer hydrogel is formed by short-time initial ultraviolet irradiation. After the pre-polymer hydrogel is transferred to the surface of an electrode, secondary ultraviolet irradiation is performed to enable chemical bonding and interpenetrating network structure between the hydrogel and the electrode. Finally, an active metal top electrode is attached. Through the synergistic design of the two-step curing method and the active electrode, on the one hand, the firm interface combination of the hydrogel and the electrode is realized, and the contact impedance is significantly reduced; on the other hand, the additional output is generated by the redox reaction between the active electrode and the hydrogel, thereby greatly improving the electrical output performance of the device. The obtained generator has excellent electrical output performance in a wide temperature and humidity range, and can be integrated for power supply and used as a high-sensitivity self-powered sensor, and has application prospects in the field of flexible wearable devices.

This invention provides a polymer electrolyte, its preparation method, and its application. The raw materials of the polymer electrolyte, by mass, include the following components: 8-12 parts of an olefin polymer, 4-8 parts of a sodium salt, 0.4-1.2 parts of hydrophobic fumed silica (SiO2), 7-30 parts of a fluorinated small-molecule plasticizer, and 35-85 parts of a solvent. The polymer electrolyte of this invention uses a fluorinated small-molecule plasticizer with weak solvation ability as the plasticizer in the electrolyte, which improves the mechanical properties of the electrolyte membrane. Simultaneously, it forms a competitive coordination effect with the residual solvent with strong solvation ability, which is beneficial for inhibiting the corrosion effect of sodium salt on the current collector. The hydrophobic fumed silica filler reduces the crystallinity of the polymer matrix and enhances the mobility of the polymer matrix segments, thereby improving the ionic conductivity.

This invention provides a resin-based hard carbon material, its preparation method, and a battery. The resin-based hard carbon material has a porous structure, including micropores and ultramicropores; the pore size distribution of the ultramicropores is <0.7 nm, and the pore size distribution of the micropores is 0.7–2 nm (excluding 2 nm); zinc is also attached to the pore walls. The resin-based hard carbon provided by this invention has narrow, uniform, and dense pores, possessing both micropores and abundant ultramicropores, which is beneficial for lithium-ion storage. Furthermore, the ultramicropores isolate the entry of electrolyte, avoiding excessive side reactions and irreversible capacity buildup while achieving lithium-ion storage. It also retains the high-rate performance characteristics of hard carbon materials. The zinc in the pores also has a lithiophilic effect, further attracting lithium ions into the pores, thus achieving the goal of improving the capacity and first-time efficiency of hard carbon materials while maintaining high-rate performance.

The utility model relates to a kind of electrode structure of supercapacitor, to solve the problem of insufficient electrode and electrolyte interface contact, big resistance. The structure includes electrode main body, its one side is sequentially provided with porous layer, intermediate layer and electrolyte reservoir. The porosity of porous layer is not less than 50%, aperture range is 1-100nm, can significantly increase the actual contact area of electrode and electrolyte, reduce interface resistance. Intermediate layer is conductive polymer layer, can relieve interface stress, improve interface stability, while optimizing electrode surface characteristics, so that electrolyte is more easily spread and soak. The cavity volume of electrolyte reservoir accounts for 30%-40% of total volume, ensure sufficient supply of electrolyte. The device improves ion transport efficiency, reduces ion diffusion resistance, enhances electrode mechanical strength, prolongs the service life of supercapacitor, improves electrochemical performance through the synergistic effect of porous layer, intermediate layer and electrolyte reservoir.

This invention discloses a multilayer synergistic composite membrane for alkaline water electrolysis to produce hydrogen, its preparation method, and its application, belonging to the field of water electrolysis hydrogen production technology. The membrane comprises, from bottom to top, a base support layer, an intermediate functional layer, and a surface hydrophilic layer; wherein the base support layer is a hydrophilically treated polyphenylene sulfide nonwoven fabric, the intermediate functional layer is a polysulfone / ZrO2-TiO2 heterostructure composite material, and the surface hydrophilic layer is a chitosan-polyethyleneimine dual-network hydrogel. This membrane features low surface resistivity, high gas barrier properties, excellent mechanical strength, and long-term stability, making it particularly suitable for alkaline water electrolysis to produce hydrogen under high current densities.

Provided are a solid electrolyte (19), an ion conductor (10), a sheet (15), an electrode (12), a diaphragm (25), and an energy storage device (11) capable of reducing interfacial resistance. The solid electrolyte has a garnet-type crystal structure containing Li, La, Zr, and O. In X-ray photoelectron spectroscopy, when the area intensity of the first peak corresponding to the Li-O bond in the O1s energy spectrum detected by irradiation with monochromatic AlKα rays is set as the first intensity, the area intensity of the peak existing at a position where the bonding energy is greater than that of the first peak is set as the second intensity, the area intensity of the third peak corresponding to the Li-O bond in the O1s energy spectrum detected by irradiation with monochromatic CrKα rays is set as the third intensity, and the area intensity of the peak existing at a position where the bonding energy is greater than that of the third peak is set as the fourth intensity, the second intensity is greater than the first intensity, and the fourth intensity is less than the third intensity.

The application provides a biosensor based on a screen-printed electrode and a preparation method and application thereof. The preparation method comprises the following steps: a, depositing a silicon thin film transition layer on the surface of a working electrode of a screen-printed electrode by using a PECVD device; b, spin-coating a tin dioxide solution on the surface of the silicon thin film transition layer to form a tin dioxide layer; c, first performing hydrogen reduction on the surface of the tin dioxide layer, and then performing silicon nanowire growth to obtain a silicon nanowire layer; d, first performing ultraviolet ozone treatment on the silicon nanowire layer, then placing the silicon nanowire layer in an alcohol solution containing 3-aminopropyl triethoxysilane to perform condensation reaction, cleaning, then performing heating to enhance the coupling strength, and finally placing the silicon nanowire layer in a phosphate buffer solution containing a nucleic acid aptamer to fix the nucleic acid aptamer, so as to obtain the biosensor. The application prepares silicon nanowires on a screen-printed electrode, then fixes a nucleic acid aptamer, and constructs an electrochemical sensor for detecting Alzheimer's disease, and the electrochemical sensor has excellent conductivity, biocompatibility and detection sensitivity.

This application provides a secondary battery and an electrical device. The secondary battery includes a positive electrode sheet, which includes a positive current collector, a first positive active layer disposed on at least one surface of the positive current collector, and a second active layer disposed on the side of the first active layer opposite to the positive current collector. The first active layer and the second active layer each independently include a positive active material, a binder, and a conductive agent. The binder includes PVDF-g-PAALi, satisfying: Nw1 > Nw2, where Nw1 represents the weight-average molecular weight of PVDF-g-PAALi in the first active layer, and Nw2 represents the weight-average molecular weight of PVDF-g-PAALi in the second active layer; G1% < G2%, where G1% represents the PAALi grafting rate of PVDF-g-PAALi in the first active layer, and G2% represents the PAALi grafting rate of PVDF-g-PAALi in the first active layer.

The present application belongs to the field of batteries. The present application provides a kind of pole piece for improving surface flatness, its preparation method and battery, the preparation method includes that the coating layer of pole piece has formed is carried out re-coating, the mode of re-coating is gravure coating, control the particle size of substance in slurry used in re-coating is less than the particle size of substance in the coating layer that has formed, then carries out isostatic pressing treatment, forms re-coating layer.The specific re-coating layer formed by isostatic pressing treatment of the present application can prevent the generation of internal and surface defects of pole piece caused by roll pressing, improve the surface roughness and thickness uniformity of pole piece, effectively improve the surface flatness of pole piece and reduce interface impedance, optimize the solid-solid contact state and effect of electrode active material and solid electrolyte in pole piece, and further improve the cycle stability of battery.