1352 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 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 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 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 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.

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.

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.

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 provides a lithium iron phosphate material and a preparation method thereof, a positive pole piece and a lithium ion battery, the preparation method comprises the following steps: dissolving a soluble iron salt and a ligand in water to form an iron-based complex so as to obtain a first solution; placing the carboxylated cellulose material in a first solution to form an iron-cellulose complex, so as to obtain a first mixed material; carrying out first separation and drying on the first mixed material to obtain an iron-cellulose complex; and mixing a lithium source, an iron source, a phosphorus source, a carbon source and the iron-cellulose complex in a solvent, heating, carrying out second separation on the obtained reaction mixture, and sintering the obtained solid to obtain the lithium iron phosphate material. According to the method, an iron-cellulose complex is used as a one-dimensional structure template, the lithium iron phosphate material with a one-to-many electron transport mechanism is successfully constructed, the conductivity, the rate capability and the working voltage of the material are improved, and the problem of capacity fading of the lithium iron phosphate material under high current density is further solved.

The invention relates to the technical field of sodium-ion batteries, and discloses a preparation method and application of a cation-doped polyanion type sodium-ion battery positive electrode material, the chemical formula of the positive electrode material is Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7, TM is one or more of transition metals with the same valence state as Fe < 2 + > in Mn, Co, Ni, Cu and Zn, x is more than 0 and less than or equal to 0.5, y is more than 0 and less than or equal to 0.4; precursor wet gel is obtained through a sol-gel process, and is sintered after being dried. The transition metal cations with the same valence state and different electronic structures are introduced into the Fe site of the material, and the electron transmission rate is effectively increased and the ion diffusion kinetics is enhanced by adjusting the Fe coordination environment; when the Na < 4 + x > Fe < 3-y > TMy (PO4) 2P2O7 positive electrode material prepared by the invention is applied to a sodium ion battery, high specific discharge capacity, excellent rate capability and cycle performance are shown.

The invention belongs to the technical field of perovskite solar cells, and particularly relates to a preparation method for improving the quality of a perovskite thin film by using a local high-temperature field, and the method comprises the steps: 1, forming a perovskite precursor thin film on an electron transmission layer; step 2, when the precursor film is in an intermediate phase or an incompletely crystallized state, placing the precursor film below a heating plate with a microstructure array, keeping a gap between a convex part of the microstructure array and the surface of the precursor film, and forming a periodically distributed local high-temperature field on the surface of the precursor film; step 3, maintaining the local high-temperature field to act for a period of time, so that the local area of the precursor film is preferentially crystallized; and 4, removing the heating plate, and uniformly annealing the precursor film. According to the method, a local high-temperature field is applied to induce a hot spot region to preferentially nucleate, abnormal growth and Ostwald ripening of crystal grains are inhibited, and the large-area uniform perovskite thin film with narrow crystal grain size distribution, low defect density and a flat film surface is obtained, so that the efficiency and consistency of a device are improved.

The present invention relates to an organic electroluminescent device comprising an emitting layer B comprising two host materials, namely an n-type (electron transport) and a p-type (hole transport) host material, a thermally activated delayed fluorescence (TADF) material, and an emitter material exhibiting a narrow deep blue emission with a small full width at half maximum (FWHM) and an emission maximum of 440 nm to 475 nm. Furthermore, the present invention relates to a method for generating blue light using the organic electroluminescent device of the present invention.

The invention relates to the field of negative electrode materials, in particular to a carbon nanotube enhanced negative electrode material and a preparation method thereof. The carbon nanotube enhanced negative electrode material comprises the following substances in parts by weight: an artificial graphite inner core, a carbon nanotube coating layer and an asphalt coating layer which are sequentially coated from inside to outside, and the carbon nanotube coating layer further comprises magnetic modified particles, the asphalt coating layer comprises the following substances in parts by weight: 25-35 parts of biochar particles; 65 to 70 parts of asphalt particles; and 0.1-0.5 part of a dispersant. According to the application, a continuous conductive network can be constructed through the carbon nanotube coating layer, the electron transmission efficiency is improved, and meanwhile, the asphalt coating layer is compounded through the biochar particles and the asphalt. The synergistic effect of the three-layer structure can repair the surface defects of the artificial graphite, reduce the side reaction of the electrolyte and inhibit the volume expansion in the charge-discharge process, so that the cycling stability and conductivity of the negative electrode material are comprehensively improved.

The invention discloses a composite lithium supplement additive and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The composite lithium supplement additive provided by the invention comprises a lithium-rich lithium ferrite core; the conductive carbon coating layer and the pentafluoropropionamide coating layer are sequentially coated outside the lithium-rich lithium ferrite inner core from inside to outside, so as to form a core-shell structure. The composite lithium supplement additive prepared by the invention forms a three-dimensional interpenetrating electron transport network, significantly improves the material conductivity, optimizes the charge transfer dynamics, can effectively isolate lithium-rich lithium ferrite from contacting H2O and CO2 in the air, significantly reduces the generation of surface residual alkali, can adapt to the volume expansion of lithium-rich lithium ferrite in the charge-discharge process, and improves the lithium supplement efficiency. And material structure damage caused by interface stress is reduced, so that the cycling stability of the lithium ion battery is greatly improved, the service life of the lithium ion battery is greatly prolonged, and the material has a wide application prospect in the lithium ion battery.

The application discloses a preparation method of a high-density and high-stability conductive polymer film based on electrochemical polymerization, and comprises the following steps: using an oxidant solution and a BFDO monomer solution to pretreat a formed foil to obtain a working electrode, then immersing the working electrode and a reference electrode into an electrolyte to perform electrochemical oxidation polymerization, and obtaining the high-density and high-stability conductive polymer film based on electrochemical polymerization. The pretreated formed foil containing N-type conductive polymer PBFDO is prepared by using a chemical in-situ polymerization method on the formed foil, and when the pretreated formed foil is applied in the field of capacitors, the conductivity and electron transport capacity of the capacitor can be improved, and the stability problem caused by the coupling of positive and negative charges in the traditional capacitor is greatly improved.

The invention provides a silicon-based material with a core-shell structure, a preparation method of the silicon-based material, a negative plate and a lithium ion battery. The core-shell structure silicon-based material comprises a silicon core and a SiOC shell coating the surface of the silicon core. The free carbon component in the SiOC shell layer has good electron conduction capability, and is beneficial to promoting charge transmission in the electrode material, thereby being beneficial to improving the conductivity of the core-shell structure silicon-based material. Due to the existence of the SiOC shell layer, the direct contact between the silicon core and the electrolyte is reduced, the overgrowth and repeated damage of the SEI layer are inhibited, and the continuous consumption of the electrolyte and the loss of active Li < + > are reduced. Therefore, the silicon-based material with the core-shell structure has relatively low volume change in the charge-discharge process, and the silicon-based material with the core-shell structure has excellent ion transmission and electron transmission performance, so that the specific capacity and the cycling stability of the battery can be improved when the silicon-based material with the core-shell structure is applied to the battery.

The invention discloses a nitrogen / boron-doped non-noble metal-based material, a synthesis method thereof and application of the nitrogen / boron-doped non-noble metal-based material in a microbial fuel cell. According to the method, a carbon fiber brush is used as a substrate, urea and sodium borohydride are used as a nitrogen source and a carbon source respectively, and the nitrogen / boron doped non-noble metal-based material is synthesized through a hydrothermal method. The electrostatic interaction between graphene oxide and FeCoNi-LDH is utilized to realize tight combination, so that FeCoNi-LDH nanosheets are uniformly dispersed on the surface of the carbon fiber brush, and the problems that LDHs are easy to agglomerate and poor in conductivity are solved; in the boron / nitrogen co-doping process, an efficient electron transmission channel is constructed by adjusting the electronic structure of the composite material, and the material is endowed with excellent electron transmission capability and oxygen reduction performance. In an MFC (Microbial Fuel Cell) test constructed by taking a nitrogen / boron-doped non-noble metal-based material as a cathode, the output voltage and the maximum power density are several times of those of commercial Pt / C and a blank carbon fiber brush, and the carbon fiber brush has a wide application prospect in the field of microbial fuel cells.

The invention discloses an ion-electron mixed conductor material and a preparation method and application thereof. The ion-electron mixed conductor material is prepared by doping a heterovalent transition metal element ion pair in a solid electrolyte. The different-valence transition metal element ion pairs comprise same transition metal elements with different valence states or different transition metal elements with different valence states; the solid electrolyte is halide solid electrolyte. Wherein the solid electrolyte structure provides a lithium ion transmission channel, and the transition metal element is rapidly oxidized and reduced to provide an electron transmission channel. The ion-electron mixed conductor is applied to a composite positive electrode of a solid-state battery, can simultaneously transmit lithium ions and electrons, shortens the transmission paths of the lithium ions and the electrons, remarkably improves the content of positive electrode active substances, improves the cycling stability of the solid-state battery, and has a relatively good application prospect in the solid-state battery.

The invention discloses a gradient triggering method for preventing battery short circuit, which comprises the following steps: S1, uniformly mixing early-warning thermal expansion microspheres, open-circuit thermal expansion microspheres and conductive carbon black, adding a water-based adhesive, and fully dispersing to obtain a turbid liquid; s2, coating a current collector with the turbid liquid obtained in the step S1, and then carrying out drying treatment; wherein the expansion temperature of the early-warning thermal expansion microspheres is 85-95 DEG C, the expansion multiple is 10-15, and the early-warning thermal expansion microspheres are used for increasing the internal resistance of the battery during expansion so as to carry out early warning; the expansion temperature of the open-circuit thermal expansion microspheres is 130-140 DEG C, the expansion multiple is 50-100 times, and the open-circuit thermal expansion microspheres are used for disconnecting direct contact between the positive electrode current collector and the negative electrode during expansion and cutting off electron transmission so as to avoid internal short circuit thermal runaway. The anode current collector prepared on the basis of the gradient trigger safety response mechanism for preventing the internal short circuit of the lithium battery has the characteristic that a micron-sized protective layer is in contact with a cathode when the internal short circuit occurs, so that the defects of other methods such as expensive equipment, complex working procedures and reduction of the energy density of the battery are overcome.

The invention provides a compound with an electron transmission function, an organic electroluminescent device containing the compound and application of the compound, the structure of the compound takes 9-alkyl-9-phenyl fluorenyl, phenanthryl and a triazine group as main components, the 9-alkyl-9-phenyl fluorenyl is one of core structures, fluorene is a polycyclic aromatic hydrocarbon with better planarity, and the triazine group is one of the core structures. Alkyl and phenyl are introduced to the ninth site to generate strong spatial repulsive force with a fluorene ring, a three-dimensional and non-planar propeller-shaped structure is formed, and the non-planar structure can effectively inhibit close packing of molecules in a solid state, so that concentration quenching and excimer formation caused by pi-pi packing are prevented, and the stability of the fluorescent probe is improved. And moreover, the rigid and non-planar structure can also effectively improve the thermal stability of the material, and the service life of the device is prolonged. The compound provided by the invention is used as an electron transport layer and a hole blocking layer in a light-emitting device, so that the device has low driving voltage, high luminous efficiency and long service life.

The invention relates to a multi-conductive-agent composite conductive paste for a lithium battery and a preparation method of the multi-conductive-agent composite conductive paste, and belongs to the technical field of lithium battery conductive pastes.The multi-conductive-agent composite conductive paste is characterized in that an iron-molybdenum catalyst is loaded on expanded graphite, then vertical orientation carbon nanotubes and transverse graphene blades are grown in situ, the specific surface area is increased, and the expanded graphite serves as a layered carrier; a metal alloy catalyst can be uniformly loaded in natural pores of the carbon nanotube, a layered framework is kept from collapsing at a high temperature, support is provided for directional growth of a carbon material, electrons can be rapidly transmitted along the carbon nanotube when the composite conductive paste is prepared, gaps of the carbon nanotube are filled by graphene blades, a breakpoint-free conductive network is formed, and the composite conductive paste is prepared. And meanwhile, abundant pores provide channels for lithium ion diffusion, so that the conductive efficiency is improved from the source of the structure, and abundant specific surface area and subsequent nitrogen and sulfur loading provide sufficient sites.

The invention provides a negative active material, a negative pole piece, a lithium ion battery and an electric device, and belongs to the technical field of batteries. The negative electrode active material has the core-shell structure, the coating layer is arranged on the surface of the graphite core, and through the synergistic effect of molybdenum disulfide in the coating layer and a carbon material except graphite, lithium ions can be rapidly conducted into crystal lattices of graphite for embedding, so that the electron transmission efficiency and the ion diffusion rate of the negative electrode active material are improved, and the service life of the negative electrode active material is prolonged. Therefore, the rate capability and the cycle performance of the negative electrode active material are improved, and the lithium precipitation phenomenon is relieved.

The invention discloses a topology enhanced three-dimensional porous framework lithium-based metal negative electrode material as well as a preparation method and application thereof, and belongs to the technical field of solid-state lithium batteries. The material comprises a three-dimensional porous conductive skeleton and an electrochemical active lithium-based phase, pores of the three-dimensional porous conductive skeleton are filled with the electrochemical active lithium-based phase, and tight physical and electrochemical contact is formed; the three-dimensional porous conductive framework is provided with a lithium-loving surface; the three-dimensional porous conductive skeleton has a Young modulus greater than 10 GPa; and the electrochemical active lithium-based phase is pure lithium metal or lithium alloy. The three-dimensional skeleton can effectively buffer the volume change of active lithium in the charging and discharging process, inhibit the growth of lithium dendrites, provide rapid lithium ion and electron transmission channels and bear external pressure. The all-solid-state lithium battery adopting the negative electrode material shows excellent cycling stability, high critical current density, high rate performance and nearly zero macroscopic volume change, and the comprehensive electrochemical performance and safety of the all-solid-state lithium battery are remarkably improved.