1764 results about "Electron transmission" patented technology

The invention provides a high-stability lithium-rich manganese-based positive electrode material and a preparation method thereof, and relates to the technical field of lithium-rich manganese-based positive electrode materials, and the method comprises three steps of preparation of a homogeneous precursor, solid-state mechanical fusion doping and coating, and high-temperature sintering; a lithium-rich manganese-based precursor is prepared by adopting a homogeneous coprecipitation process, uniform distribution of metal ions is ensured, then an aluminum source, a zirconium source and a fluorine source are introduced as doping agents, phosphate and a titanate coating agent are combined, doping and coating integrated treatment is realized through mechanical ball milling, and the lithium-rich manganese-based composite material is obtained. And finally, mixing with a lithium source in an argon atmosphere, and carrying out high-temperature sintering of temperature programming and staged heat preservation to form a stable composite coating layer in situ. Therefore, manganese ion migration is effectively inhibited through lattice doping, a layered structure is prevented from being converted into spinel or rock salt phase, meanwhile, a nanoscale ion / electron transmission channel is constructed, interface impedance is reduced, and the charging and discharging efficiency under high voltage is improved.

The invention belongs to the technical field of polymer insulating materials, and particularly discloses a high-toughness and high-insulating-strength epoxy insulating material and a preparation method thereof. Single-end amine-terminated straight-chain alkyl groups with different chain lengths in a specific molar ratio are grafted to fluorine-containing epoxy resin to construct a side chain structure, and then a step curing process is adopted to form a three-dimensional cross-linked network with a curing agent under the action of an accelerant. The fracture toughness is remarkably improved by utilizing an epoxy body chain extension effect in a side chain grafting process and a uniform microphase separation structure formed by self-assembly of a long alkyl side chain in a curing process; meanwhile, through the synergistic effect of steric hindrance of a short alkyl side chain and a fluorine atom charge trap, delocalized electron transmission of a benzene ring conjugated structure is inhibited, and the insulating property is synchronously enhanced. Compared with a traditional toughening technology, insulation deterioration caused by toughening modification is effectively avoided, and an epoxy resin material with mechanical reliability and insulation stability is provided for high-voltage electrical equipment.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The present invention relates to a novel organic compound and an organic electroluminescent device using same and, more specifically, to an organic compound that exhibits excellent electron transport ability, heat resistance, carrier transport capability, and luminescence, and an organic electroluminescent device in which the organic compound is included in one or more organic layers, thereby improving properties such as emission efficiency, driving voltage, and lifespan.

The invention belongs to the field of perovskite solar cells, and particularly relates to application of a bulk phase and interface synergistic passivator in a perovskite solar cell. The invention provides a bulk phase / interface synergistic passivation innovative strategy, molecules with a tricyclic sulfur-nitrogen heterocyclic ring structure are introduced as a synergistic passivator, and defect global repair of each functional layer of a device is realized. The molecular design of the structural derivative taking phenothiazine as the core has the following advantages: skeleton characteristics: a conjugated tricyclic system forms an electron transport network through pi-pi stacking, endows molecules with excellent electron delocalization ability, and effectively regulates and controls carrier kinetics; the thioether group is used for dynamically repairing an ion migration channel through oxidation-reduction activity and inhibiting formation of deep-energy-level defects; and the secondary amine group is used as a hydrogen bond donor for anchoring uncoordinated halide ions and synchronously passivating surface and grain boundary defects.

The invention relates to the technical field of electrode materials, and discloses a preparation method of a lithium iron manganese phosphate material and a lithium ion battery. The lithium iron manganese phosphate material is prepared by the following steps: performing in-situ growth in a cavity of polyethylene glycol-sucrose hybrid aerogel with a three-dimensional porous network structure to form a manganese iron phosphate precursor; the hybrid aerogel can control excessive agglomeration and disordered growth of ferromanganese phosphate precursor particles and avoid particle agglomeration, so that the finally formed lithium ferromanganese phosphate material particles are finer and more uniformly distributed, and an amorphous carbon-aluminum layer is formed during later calcination, so that the performance of the material is improved. The surface of lithium manganese iron phosphate particles is tightly coated with the composite material, electron transmission can be accelerated, particle pulverization can be reduced, meanwhile, corrosion of corrosive components in electrolyte can be inhibited, interface side reactions such as transition metal ion dissolution can be reduced, and finally the conductivity and cycling stability of the lithium ion battery are remarkably improved.

The invention discloses an optical-grade PET release film and a preparation method and application thereof, and belongs to the technical field of PET release liners.The preparation method comprises the steps that organic silicon resin, polyacrylate and functional silicone oil serve as raw materials, hexadecafluorophthalocyanine copper serves as a catalyst, sodium hydroxide provides hydroxyl anions, and hydroxyl-containing fluorinated hydroxyaniline is obtained; amino groups on the surface of fluorinated hydroxyaniline react with carboxyl groups of graphene oxide and are grafted on the surface of graphene oxide, then hydroxyl groups in the fluorinated hydroxyaniline and carboxyl groups of acrylic acid are subjected to esterification reaction under the action of a catalyst, so that acrylic acid is grafted on fluorinated modified graphene oxide, and the fluorinated modified graphene oxide is obtained. Therefore, hydroxyl and epoxy functional groups on the surface of the graphene oxide are consumed, hindering of electron transmission is reduced, the conductivity of the release film is improved, and the antistatic requirement of the release film is met.

The invention provides a carbon-based negative electrode material, a preparation method, a secondary battery and an electric device. The carbon-based negative electrode material is granular and comprises a carbon-based core and a coating structure, the coating structure comprises a fast ion conductor layer and a stable modification layer which are sequentially arranged on the surface of the carbon-based core, the fast ion conductor layer is arranged on the surface of the carbon-based core, and the stable modification layer is arranged on the surface of the fast ion conductor layer; the stable modification layer has electron and ion transmission capability and has self-supporting performance through chemical bonding connection in the layer so as to protect the fast ion conductor layer. A negative electrode of a secondary battery includes a carbon-based negative electrode material. The power utilization device comprises a secondary battery. The stable modification layer has relatively good ion electron transmission capability and structural stability, and can improve the retention rate of the fast ion conductor layer in the negative electrode material processing process and the battery operation process, so that the structural integrity of the negative electrode active material is protected, and the stability of the battery performance is improved.

The invention discloses a high-performance lithium-rich manganese oxide positive electrode material, a preparation method thereof and application of the high-performance lithium-rich manganese oxide positive electrode material to an all-solid-state battery. The lithium-rich manganese oxide positive electrode material coats / composites a lithium-rich manganese positive electrode base material and a lithium ion conductor or a conductive agent in situ through a freeze-drying method. In-situ coating / compounding of a lithium ion conductor or a conductive agent on the lithium-rich manganese oxide positive electrode material is realized through freeze drying, the interface impedance is effectively reduced, the interface stability is improved, and the lithium ion and electron transmission efficiency is improved. The lithium-rich manganese oxide positive electrode material prepared by the invention can inhibit the release and side reaction of lattice oxygen in the cycle process, and improve the structural stability and cycle life of the material; meanwhile, the freeze-drying method can maintain the nano dispersity and uniformity of the material, full solid-solid contact between the lithium-rich manganese material and a lithium ion conductor or a conductive agent is realized, and the high specific capacity of the lithium-rich manganese positive electrode material in all-solid-state battery application is ensured. The prepared lithium-rich manganese-based all-solid-state battery has the reversible specific capacity as high as 273 mAh / g, the bottleneck that the capacity release of the lithium-rich manganese oxide positive electrode material in an all-solid-state battery system is limited is broken through, the strategy provides a new design thought and technical path for the construction of the high-specific-energy all-solid-state battery positive electrode material, the adopted process is simple and controllable, and the method is suitable for industrial production. The method is suitable for large-scale preparation.

The invention discloses a preparation method of a negative electrode material of a sodium ion battery, a negative electrode plate containing the negative electrode material and the sodium ion battery, and the negative electrode material is prepared by taking biomass waste semen cassiae as a carbon precursor and montmorillonite as a template and combining an in-situ fluorine ion exchange and carbonization process. The preparation method comprises the following steps: mixing semen cassiae with montmorillonite, removing a template, and carrying out fluorine ion exchange to obtain the fluorine-doped three-dimensional porous carbon composite material. According to the material, micro / mesopore distribution is regulated and controlled through a confinement effect between montmorillonite layers, uniform doping of fluorine elements is realized, and an electronic structure and a pore channel system are synergistically optimized. The composite material has rich sodium storage active sites, efficient ion / electron transmission paths and stable interface characteristics, can significantly improve the specific capacity, rate capability and cycle life of the sodium-ion battery, and has important application value in the field of sodium-ion battery negative electrode materials.

The invention discloses a graphite diacetylene / copper oxide composite material cocatalyst and a co-production preparation process and application thereof. Graphite diyne has a two-dimensional layered structure and is composed of sp and sp hybridized carbon atoms, a periodically distributed structure is formed, and excellent electron transmission performance and pore structure are shown. An existing graphite diacetylene synthesis method is complex and high in cost, large-scale application of the graphite diacetylene in the industrial field is seriously restricted, the potential value of a copper catalyst cannot be fully exerted, and resource waste is caused. According to the invention, through a simple and efficient co-production process, co-production of graphite diyne and copper oxide nanoparticles is realized for the first time, and the graphite diyne / copper oxide composite material is successfully prepared. The novel composite material can be used as a cocatalyst to effectively improve photocatalytic hydrogen production, and the hydrogen production performance can be comparable with that of noble metal photocatalysts such as Pt. The problems of tedious steps, high energy consumption, low yield and the like in a traditional preparation method are solved, and the preparation method has important application value in the field of high-performance photocatalysis.

The invention discloses a binder system with an electron and ion conduction function and application thereof. The binder system comprises 1) a cross-linking agent containing an ethyoxyl unit and 2) a polymer with electron conduction or electron and ion conduction functions, and the cross-linking agent and the polymer respectively have groups which are cross-linked under light and / or heat conditions; when in use, light and / or heat are utilized to initiate a cross-linking reaction, so that the polymer is cross-linked in situ by the cross-linking agent, and a three-dimensional binder network structure for ion and electron transmission is formed. According to the binder system disclosed by the invention, the polymer is subjected to in-situ crosslinking by utilizing the cross-linking agent to form a three-dimensional binder network structure, the polymer is used as a conjugated main chain for providing electron transmission, and the cross-linking agent is used as a flexible cross-linking chain segment beneficial to ion diffusion, so that the mechanical property of the binder is improved to the greatest extent while the high adhesive force of the binder is ensured; enough mechanical properties are provided for a battery pole piece to maintain the integrity of an electrode, so that the cycling stability of the high-specific-capacity negative electrode material is improved.

The invention relates to the technical field of metal materials, and discloses a composite metal material based on micro-nano porous copper powder, which is composed of the following components: a matrix is micro-nano porous copper powder with the particle size of 50-500 nanometers, the porosity is 30-80%, and the pore diameter is 20-200 nanometers; the metal additive comprises 5-20 wt% of aluminum powder and 3-15 wt% of nickel powder; the functional additive comprises 1 to 8 weight percent of titanium powder, 0.5 to 5 weight percent of graphene and 0.3 to 3 weight percent of a carbon nano tube; a nickel-titanium alloy coating with the thickness of 50-500 nanometers is formed on the surface of the micro-nano porous copper powder through electrochemical deposition. Through the graded hole design of the micro-nano porous copper powder, a main hole channel provides a rapid electron transmission path, the powder gap stress is eliminated in the low-temperature pre-pressing stage, and atom diffusion and densification are promoted in the high-temperature and high-pressure stage, so that the resistance can be effectively reduced, the loss of energy in the transmission process is reduced, and the energy transmission efficiency of the whole system is improved.

The invention discloses a micro-positive pressure hydrogen environment in-situ stress-strain testing device and method. The device comprises a sealed reaction cavity which can be placed in a scanning electron microscope sample cabin; the loading device is arranged in the cavity and is used for fixing and applying a load; the atmosphere control system is communicated with the cavity and is used for introducing gas and maintaining a micro-positive pressure state; an electron transmission window arranged on the cavity, wherein an electronic transparent film packaged by the electron transmission window can maintain air tightness under micro-positive pressure and allows electron beams to penetrate through; and the heating module is arranged in the cavity. The method comprises the following steps: loading and sealing a sample, establishing a micro-positive pressure atmosphere, heating the sample, starting loading, and synchronously carrying out SEM real-time imaging and data recording. The problem that a traditional SEM in-situ device cannot work in a real micro-positive pressure hydrogen and high-temperature environment is solved, and synchronous visual in-situ observation of material microstructure evolution and macromechanical response under the gas-heat-force multi-physics field coupling condition is achieved.

The invention relates to the technical field of electroluminescence, and discloses a laminated organic light-emitting device and application thereof, and the laminated organic light-emitting device comprises an anode layer, a first light-emitting unit, an electron transport layer, an interface modification layer, a connection layer, a second light-emitting unit and a cathode layer which are sequentially arranged from bottom to top; the electron transport layer comprises a hole blocking layer and an n-type electron transport layer; wherein the n-type electron transport layer is composed of an n-type dopant and an organic electron transport material, has the functions of electron transport, charge separation and injection and regulation and control of the optical microcavity effect of the laminated device, can simplify the electron transport and connection layer structure of the laminated device, and effectively improves the conductivity of the laminated device; according to the laminated organic light-emitting device, the voltage drop of the body is obviously reduced, and the interface electron injection barrier is reduced, so that the laminated organic light-emitting device has the advantages of low driving voltage, high efficiency and long service life, and the effect of adjusting the optical microcavity of the device can be achieved by utilizing the n-type electron transport layer.

The invention provides a negative electrode and a preparation method thereof, a battery and electric equipment. The negative electrode comprises a negative electrode current collector and a negative electrode active material layer arranged on the surface of the negative electrode current collector, the negative electrode active material layer comprises graphite, the orientation value of the negative electrode active material layer is less than or equal to 3, and the binding force between the negative electrode current collector and the negative electrode active material layer is greater than or equal to 0.25 N / 40mm. The negative electrode has excellent ion and electron transmission capability and good internal stability, is favorable for being used in the battery, improves the charge-discharge rate and the cycle capacity retention rate of the battery, and prolongs the service life of the battery.

The invention discloses a composite material and application thereof in electrochemical carbon dioxide capture, and belongs to the technical field of electrochemistry and carbon dioxide capture. The composite material provided by the invention comprises a carbon felt and a 1, 4-naphthoquinone compound, the 1, 4-naphthoquinone compound is loaded on the carbon felt; the 1, 4-naphthoquinone compound comprises at least one of 1, 4-naphthoquinone, 2-methyl-1, 4-naphthoquinone or 2, 3-dimethyl-1, 4-naphthoquinone, and the compound is a compound of the 1, 4-naphthoquinone, the 2-methyl-1, 4-naphthoquinone and the 2, 3-dimethyl-1, 4-naphthoquinone. In the composite material disclosed by the invention, a 1, 4-naphthoquinone structure of the 1, 4-naphthoquinone compound can realize specific capture of CO2 through a reversible oxidation-reduction reaction, a carbon felt three-dimensional porous framework provides a smooth channel for CO2 mass transfer and electron transmission, and the 1, 4-naphthoquinone structure and the carbon felt three-dimensional porous framework cooperate with each other to solve the problems of low capture capacity, poor stability and high energy consumption of a traditional carbon material; therefore, the method has a good application prospect in electrochemical carbon dioxide capture.

A light-emitting device includes: a first electrode; a second electrode; an interlayer between the first electrode and the second electrode and including an emission layer; a hole transport region between the first electrode and the emission layer; and an electron transport region between the second electrode and the emission layer, wherein the first electrode is a multi-layered electrode including: a first layer including a first material, a second layer disposed on the first layer and including a second material, and a third layer between the second layer and the hole transport region and including a third material, wherein a first surface of the third layer contacts the second layer, and a second surface of the third layer facing the first surface directly contacts the hole transport region, and the third material has a work function of greater than about 4.8 eV and less than or equal to about 6.8 eV.

The invention relates to the field of gas sensing, and discloses a two-dimensional Cu-TCPP modified bimetallic MOF composite material and a preparation method and application thereof, a gas sensor and a preparation method and application thereof, the two-dimensional Cu-TCPP modified bimetallic MOF composite material comprises a Zn / Co-MOF material, and the surface of the Zn / Co-MOF material is modified with a Cu-TCPP nanosheet. According to the two-dimensional Cu-TCPP modified bimetallic MOF composite material, the characteristics of large surface area and high electron transmission efficiency of a two-dimensional material and the characteristics of porosity, high specific surface area, chemical tunability and the like of an MOF material are fused, and the catalytic activity of the material is enhanced through introduction of Cu-TCPP, so that the detection sensitivity of target gas is improved; resistance change detection of gas molecules is realized, and the gas molecules are converted into electric signals to be output and used for monitoring characteristic gas of dissolved gas in transformer oil.

Disclosed in the present invention are an oxygen-enriched carbon quantum dot composite bismuth oxybromide nanosheet material, and a preparation method therefor and the use thereof. The preparation method comprises: sequentially uniformly dissolving Bi(NO3)3·5H2O and oxygen-enriched carbon quantum dots in a mannitol solution, then adding KBr thereto, stirring the mixture, then subjecting same to a solvothermal reaction, and then subjecting same to washing, suction filtration and drying, so as to obtain an oxygen-enriched carbon quantum dot composite bismuth oxybromide nanosheet material. The preparation method of the present invention is simple, and the bismuth oxybromide nanosheet is more easily and uniformly modified with the oxygen-enriched carbon quantum dots. The oxygen-enriched carbon quantum dots provide more active sites for bismuth oxybromide, thereby overcoming the defects of monomer bismuth oxybromide having a limited visible-light response and few active sites, optimizing the electron transmission performance of monomers, enhancing the light absorption intensity of the material, effectively guiding the charge flow, accelerating the separation and transfer of photo-generated charges, and achieving efficient visible light catalytic activity.

The invention provides an Au nanocluster-Cu monatomic / titanium dioxide photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysis. According to the invention, the Cu monatomic atom is used as a catalyst for hydrogen evolution reaction, the Cu monatomic atom and the Au nano-cluster are loaded at the same time, the Cu monatomic atom can be used as an electron transport bridge to regulate the electronic structure of the Au nano-cluster, the synergistic effect of the Cu monatomic atom and the Au nano-cluster is realized, the catalytic activity is regulated and controlled together, and efficient series connection of multi-step reaction is realized; therefore, the product selectivity can be accurately regulated and controlled; the catalytic oxidation reaction can be dynamically adjusted through carrier mediation or direct contact by virtue of the electron interaction between the Cu monatomic and the Au nano-cluster, so that the electron distribution in the catalytic process is favorably optimized, the reaction energy barrier of C-C bond breakage and hydroxymethyl oxidation is regulated and controlled, and the dynamic performance of generating GA and hydrogen through photocatalytic oxidation of EG is improved.

A lithium-ion battery and an electric device. The lithium-ion battery comprises an electrode sheet assembly, wherein the electrode sheet assembly comprises a positive electrode sheet, a negative electrode sheet and a separator, at least one of the positive electrode sheet and the negative electrode sheet comprises a composite current collector, a first conductive layer and at least two active material layers, and the at least two active material layers are stacked on at least one surface of the composite current collector in the thickness direction thereof; and on the same side of the composite current collector, the electrical conductivity of the active material layer away from the composite current collector is lower than the electrical conductivity of the active material layer close to the composite current collector, such that the active material layer which is close to the composite current collector and has higher electrical conductivity can compensate for the electron transport capability of the composite current collector, thereby reducing electron transport resistance in the composite current collector. By means of providing a first conductive layer connecting a composite current collector and active material layers, the rate capability and overcurrent capability of a lithium-ion battery can be effectively improved while the energy density thereof is not significantly reduced.

The invention discloses a preparation method of a Prussian blue analogue (CoFe-PBA) and copper metal organic framework (HKUST-1) composite core-shell material and application of the composite core-shell material in oxygen evolution reaction (OER). The material is prepared through a step-by-step synthesis and composite process: firstly, synthesizing copper-based MOF (HKUST-1) and a ferrocobalt Prussian blue analogue (CoFe-PBA), then compounding the copper-based MOF (HKUST-1) and the ferrocobalt Prussian blue analogue (CoFe-PBA) through a solvothermal method to form a core-shell structure (HKUST-1-atCoFe-PBA), and further performing high-temperature oxidation and vulcanization treatment to obtain HKUST-1-atCoFe-O and HKUST-1-atCoFe-S materials. According to the composite material, the electron transmission efficiency and the catalytic activity are remarkably improved by utilizing the synergistic effect of multi-metal active sites of Cu, Co and Fe. No precious metal or strong corrosive reagent is used in the preparation process, the cost is low, and the green synthesis requirement is met. An electrochemical test shows that the OER overpotential of the optimized catalyst at the current density of 10mAcm is only 268mV, and the catalyst shows excellent catalytic performance. The material can be widely applied to the fields of water electrolysis hydrogen production and the like, and has important industrial application prospects.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a bituminous coal-based hard carbon negative electrode material based on oxygen treatment, a preparation method and application. The oxygen-containing functional group is introduced into the bituminous coal material, so that the electron transmission performance and the ion diffusion rate of the bituminous coal material are optimized, and the sodium storage performance and the first coulombic efficiency of the bituminous coal-based carbon material are remarkably improved. The invention provides an effective and practical strategy, converts low-cost bituminous coal into the high-grade hard carbon negative electrode of the sodium ion battery, and is suitable for popularization and application.

The invention discloses a preparation method of a lithium battery composite material, in the preparation method, by optimizing insect shells and a large number of oxygen-containing functional groups on the surfaces of the insect shells, the insect shells are subjected to pretreatment, carbonization treatment and post-treatment, and the oxygen-containing functional groups still remain on the surfaces of electrodes after carbonization; the existence of the oxygen-containing functional groups is very beneficial to improving the electrochemical energy storage effect of the electrode, and after activation treatment, the electron transmission effect is enhanced by a high surface area and a conductive network, and the thermal stability of the material can be obviously improved by adhering a small amount of calcium sulfate while the conductivity is ensured. Besides, the whole process is simple, the components interact, the whole material has excellent conductivity, lithium ions are slowly released under the regulation and control of the porous material, the situation that a large amount of lithium ions move in a short time, consequently, a large amount of heat is released in the battery, the battery structure is damaged, and the service life of the battery is shortened is avoided, the capacity retention rate of the battery is increased, and the service life of the battery is prolonged. The battery service life is prolonged.

The invention relates to the technical field of solar cells, in particular to a cell piece and a photovoltaic module. The battery piece comprises a welding structure, a confluence harpoon and a confluence electrode. The welding structure comprises an edge welding structure located on the outermost side, the confluence harpoon is connected with the edge welding structure, and the confluence harpoon comprises a harpoon gap. The confluence electrode comprises a first electrode and a second electrode which are connected with the confluence harpoon, the first electrode is located between the second electrode and the edge welding structure, the first electrode penetrates through the harpoon gap in the second direction, and the second electrode is disconnected at the harpoon gap. The side, away from the edge welding structure, of the outermost first electrode is the edge area of the battery piece, and the arrangement distance of at least part of the auxiliary bus electrodes in the edge area is smaller than the arrangement distance of the auxiliary bus electrodes in other areas, so that the arrangement number of the auxiliary bus electrodes in the edge area can be increased; therefore, the current collection efficiency is improved, the electron transmission path is optimized, and the brightness uniformity and the output power of EL testing are improved.

The invention belongs to the technical field of electrode materials, and relates to coffee residue heat treatment doping-based super capacitor carbon and a preparation method and application thereof, coffee residue is used as a raw material, and after hydrothermal carbonization, staged gradient activation and ultrasonic-acid etching coupling treatment, the super capacitor carbon with a rich pore structure is prepared. According to the process, through precise matching of intrinsic characteristics of coffee grounds and process parameters, a hierarchical porous structure is constructed and is matched with an electron transport network formed by self-doping, so that the technical bottleneck that a traditional biomass carbon material is poor in electrical conductivity and difficult to achieve both ion diffusion efficiency is broken through; the super-capacitor carbon with extremely high specific surface area, excellent electricity storage performance and high energy density is finally obtained; a supercapacitor electrode prepared from the supercapacitor carbon has good charge-discharge performance, large specific capacitance, high energy density and good cycle efficiency; moreover, efficient recycling of the coffee grounds can be achieved, the environment-friendly requirement is met, the process is simple, cost is low, and application and popularization are easy.

The invention discloses a nickel disulfide composite electrode material and a preparation method and application thereof, and relates to the technical field of sodium ion battery electrode materials, the nickel disulfide composite electrode material comprises a nickel-based precursor of a cobalt-doped yolk-egg shell structure, a carbon nanotube packaged nano-alloy heterostructure is derived by utilizing the catalytic action of transition metal on a ligand, and the nickel-based precursor is a nickel-based precursor of a cobalt-doped yolk-egg shell structure. And finally, carrying out gas-phase vulcanization to form the cobalt-doped nickel disulfide electrode material with a complete spherical shell structure which is formed by stacking nano sulfide particles and is hollow and provided with holes in the surface. The carbon nano tube packaging structure is beneficial to improvement of electrolyte wettability and ion diffusion kinetics, the carbon nano tube and cobalt doping can synergistically improve the electron transmission capacity, experimental verification shows that the sodium storage performance is excellent, and the multiplying power and cycle performance of NiS2 under large current are improved.

A quantum dots light emitting diode is provided. The quantum dots light emitting diode includes a first electrode layer; an electron transport layer on the first electrode layer; and a quantum dots layer on a side of the electron transport layer away from the first electrode layer. The electron transport layer includes a gradient alloy composite sub-layer including an electron transport oxide material and an electron transport non-oxide chalcogen-containing material. The non-oxide chalcogen is selected from a group consisting of sulfide ion, selenium ion, and tellurium ion. The electron transport non-oxide chalcogen-containing material has a gradient distribution such that a content of the electron transport non-oxide chalcogen-containing material decreases along a direction from the quantum dots layer to the first electrode layer.

The invention relates to a positive pole piece, a battery comprising the positive pole piece and an electric device, and belongs to the technical field of batteries. The positive pole piece comprises a positive current collector and a positive active material layer arranged on at least one surface of the positive current collector, the positive active material layer comprises a positive active material, the positive active material comprises lithium manganese iron phosphate and a ternary positive material, and the positive pole piece meets the condition that a / b is greater than or equal to 0.09 and less than or equal to 5.1, a is the mass percentage content of the Ni element in the positive electrode active material layer, and the unit is%; b is the longitudinal wettability of the positive pole piece, and the unit is%. The LMFP and the ternary positive electrode material are compounded, and the content of the Ni element in the positive electrode active material layer and the longitudinal wettability of the positive electrode plate are reasonably controlled, so that after the positive electrode plate is applied to the battery, the charging time of the battery in a high-voltage stage can be remarkably shortened, and the battery performance is improved. Meanwhile, the balance of the lithium ion transmission rate and the electron transmission rate of the positive pole piece in the longitudinal direction is realized, and the fast charging performance and the high-temperature cycle performance of the battery are effectively improved.