24results about "Microscopic fiber electrodes" patented technology

The invention provides a sensor-structure energy storage carbon fiber battery integrated device for sports equipment and application thereof, and relates to the technical field of electrical elements. The sensor-structure energy storage carbon fiber battery comprises one or more energy storage units and a sensor unit, the energy storage unit is of a coaxial coating structure and comprises a carbon fiber bundle negative electrode, an electrolyte layer and a positive electrode coating which are sequentially arranged from inside to outside; the energy storage unit further comprises a functional interface layer, and the functional interface layer is located between the carbon fiber bundle negative electrode and the electrolyte layer and / or between the positive electrode coating and the electrolyte layer. The sensor-structure energy storage carbon fiber battery has relatively high energy density and is arranged along the stress direction of sports equipment during use, and carbon fibers serve as a battery cathode and keep the original mechanical bearing effect, so that sufficient electric energy can be provided for electronic components such as a sensor and the like on the premise of not influencing the light weight of the sports equipment, and the service life of the sensor-structure energy storage carbon fiber battery is prolonged. And zero-weight power supply is realized.

The present invention relates to the field of carbon nano electrospinning, and specifically to an electrospinning production device and preparation method for a carbon nanowire composite electrode, comprising a control host, the control host being the overall control mechanism of the equipment and being arranged on a bottom plate frame, a mixed liquid tank being nested and installed in the control host, a spinning tank being connected to the mixing tank, six groups of spinning mechanisms distributed in a circular array being arranged in the spinning tank, and a wire guide frame fixedly mounted to the inner wall of the spinning tank being arranged on the side of the spinning mechanism. By providing six groups of guide gears, the six spinning disks can be driven to spin, achieving efficient spinning, and the spinning mechanisms distributed corresponding to the spinning disks are fed and spun, a first conductive clamp clamps a first guide core for conductivity, a second conductive clamp clamps another guide core on a nozzle, and six groups of second conductive clamps clamp the nozzle and the first guide core to form six circulating electric fields, achieving zoned spinning.

The present invention belongs to the field of energy storage and new material technology, and in particular to a preparation method and application of a multi-level porous fiber modified by amine functionalization. The method comprises the following steps: a graphene oxide dispersion, sodium polyacrylate, Triton X-100 and a solvent are mixed to obtain a spinning solution; a graphene oxide nanofiber membrane is obtained by electrostatic spinning, and the obtained graphene oxide nanofiber membrane is wound using a winding process to obtain a single multi-level hole fiber; the single multi-level hole fiber obtained by S2 is placed in an amine functionalization modification solution for surface functional group modification to obtain a special one-dimensional fiber electrode modified by ammonia functionalization; chemical reduction is then performed to obtain a multi-level porous fiber modified by amine functionalization. The preparation method obtains a multi-level hole one-dimensional fiber with layered winding multi-level hole structure characteristics and a surface positive charge, which has good electrochemical properties in zinc-iodine batteries and is suitable for large-scale batch production.

This application relates to a negative electrode sheet and its preparation method, a lithium-ion battery, and an electrical device. The negative electrode sheet includes a current collector and a negative electrode active layer covering at least one surface of the current collector; the negative electrode active layer includes an intermediate layer and an outer layer sequentially stacked on the surface of the current collector; the intermediate layer is made of silicon with a silicon mass percentage greater than 50%, and the outer layer is made of a first conductive carbon material. In the negative electrode active layer, the intermediate layer is mainly made of silicon, which can fully utilize the advantage of silicon's high specific energy, giving the negative electrode sheet a higher overall energy density; the outer layer is made of a first conductive carbon material, which can effectively suppress the formation of an unstable solid electrolyte interface layer by electrolyte reaction, thus delaying battery capacity decay.

A method for producing sulfurizcd-carbon cathode materials for electrochemical cells involves mixing carbon nanofibers, sulfur, and a monomer (e.g., acrylonitrile) to form a mixture, polymerizing the monomer to encapsulate the nanofibers and sulfur within a polymer matrix (e.g., polyacrylonitrile), and pyrolyzing the matrix to chemically bond carbon from the polymer to the nanofibers and sulfur, yielding sulfurized-carbon particles fused to the nanofibers. The pyrolyzed material forms a fluffy powder that is compressed into a free-standing dry film, wherein the nanofibers and longer nanofiber yarns create a three-dimensional conductive network enhancing mechanical stability and electrical conductivity. The film is laminated to a current collector to form a cathode. Optional pore- loading with molecular sulfur improves capacity and cycle life, achieving >70% sulfur utilization without wet processing solvents.

A structured support for an energy storage micro-device, comprising: - a substrate; - micro-pillars disposed on one face of the substrate, each micro-pillar having a free surface; - nano-wires, said nano-wires being disposed on the free surface of at least a portion of the micro-pillars, and said face of the substrate being devoid of nano-wires.

The invention provides an electrode diaphragm, a preparation method thereof and a lithium battery. The preparation method comprises the following steps: pretreating a polytetrafluoroethylene material under a preset condition, and crushing to obtain first powder; wherein the pretreatment is used for inhibiting the extension of molecular chains of the polytetrafluoroethylene material, so that the polytetrafluoroethylene material is easier to break but not extend under the subsequent crushing action, the advanced fibrosis in the crushing process can be avoided, and the crushed polytetrafluoroethylene material can be better dispersed in an active material and a conductive material; therefore, the electrode performance of the electrode diaphragm is better ensured.

Due to the linear structure of cable-type cells, when a battery cell is fabricated with electrode tabs formed on both ends, the increased battery length increases the distance electrons travel from the electrodes to the electrode tabs, resulting in increased battery resistance and a decrease in the electron transfer rate. To solve this problem, the outermost casing of the cable-type cell is configured so that the external electrodes are exposed from the interior member that constitutes the outermost casing of the cable-type cell, thereby providing the function of electrode tabs without the need for electrode tabs on the external electrodes. This provides a shortest path for electrons to pass from the active material layer of the electrode to the electrode tab, thereby confirming high flexibility and low resistance.

When a cable-type cell in which electrode tabs are formed at both ends thereof is manufactured, the travel distance of electrons from electrodes to the electrode tabs increases as the length of the cell increases due to the linear structure of the cable-type cell, resulting in a problem of low electron transfer rate due to an increase in cell resistance. Disclosed is a highly flexible, low-resistance cable-type cell without electrode tabs configured such that an embedded member constituting the outermost side of the cable-type cell serves as an electrode tab without the need to form an electrode tab of an outer electrode by configuring the outermost side of the cable-typed cell such that the outer electrode is exposed from the embedded member in order to solve the above problem. The shortest path for electrons to pass from an active material layer of the electrode to the electrode tabs is provided, whereby high-flexibility and low-resistance properties are achieved.

A negative electrode includes a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a conductive agent, wherein the negative electrode active material includes a silicon-based active material, the silicon-based active material includes SiOx (0≤x<2), the conductive agent includes a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side, and the carbon nanotube structure is included in an amount of 0.01 wt % to 1.0 wt % in the negative electrode active material layer. A secondary battery including the negative electrode, and a method of preparing same are also provided.

A negative electrode active material for a non-aqueous electrolyte secondary battery according to one example of an embodiment comprises composite particles (30) that include a lithium aluminate phase (31) and a silicon phase (32) dispersed in the lithium aluminate phase (31). The composite particles (30) have an internal porosity of 25% or less before being charged and discharged for the first time.

When a cable-type cell in which electrode tabs are formed at both ends thereof is manufactured, the travel distance of electrons from electrodes to the electrode tabs increases as the length of the cell increases due to the linear structure of the cable-type cell, resulting in a problem of low electron transfer rate due to an increase in cell resistance. Disclosed is a highly flexible, low-resistance cable-type cell without electrode tabs configured such that an embedded member constituting the outermost side of the cable-type cell serves as an electrode tab without the need to form an electrode tab of an outer electrode by configuring the outermost side of the cable-typed cell such that the outer electrode is exposed from the embedded member in order to solve the above problem. The shortest path for electrons to pass from an active material layer of the electrode to the electrode tabs is provided, whereby high-flexibility and low-resistance properties are achieved.

The present invention relates to a negative electrode, a secondary battery comprising the same, and a method for preparing the negative electrode, the negative electrode comprising a negative electrode active material layer, in which the negative electrode active material layer comprises a negative electrode active material and a conductive agent, in which the negative electrode active material comprises a silicon-based active material and a carbon-based active material, the conductive agent includes a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side, and wherein, in the negative electrode, the carbon nanotube structures are connected to each other to present a network structure, in which the carbon nanotube structures have an average diameter of 5 nm to 50 nm, and in which the single-walled carbon nanotube units have an average diameter of 0.5 nm to 9 nm.

A negative electrode includes a negative electrode active material layer, wherein the negative electrode active material layer includes a negative electrode active material and a conductive agent, wherein the negative electrode active material includes a silicon-based active material, the silicon-based active material includes SiOx(0≤x<2), the conductive agent includes a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded side by side, and the carbon nanotube structure is included in an amount of 0.01 wt % to 1.0 wt % in the negative electrode active material layer. A secondary battery including the negative electrode, and a method of preparing same are also provided.

The invention relates to the technical field of flexible fabric power supplies, and discloses a preparation method of a high-safety and bending-resistant flexible fabric power supply. In order to solve the problems of rapid battery capacity attenuation and insufficient safety caused by the problems of leakage, dendritic crystal growth, positive electrode material dissolution and the like of a traditional energy storage device under mechanical deformation, the method mainly comprises the following steps: performing in-situ polymerization on an interpenetrating network bi-crosslinking gel electrolyte on the surface of a zinc wire to serve as a negative electrode; tight coating, rapid curing, high strength, spontaneous healing and continuous construction of the gel are realized; and spirally winding the fiber cathode on the surface of the fiber anode, and packaging to obtain the fiber battery. And weaving by taking the fiber batteries as wefts and warps or textile yarns as warps to form a safe, folding-resistant and self-healing flexible fabric power supply. The fiber batteries in the fabric are electrically connected through a multi-conductive terminal series / parallel connection technology, the working stability of a fabric power supply is effectively improved, and stable operation can still be kept even if a single battery is accidentally disconnected.

A method for producing sulfurizcd-carbon cathode materials for electrochemical cells involves mixing carbon nanofibers, sulfur, and a monomer (e.g., acrylonitrile) to form a mixture, polymerizing the monomer to encapsulate the nanofibers and sulfur within a polymer matrix (e.g., polyacrylonitrile), and pyrolyzing the matrix to chemically bond carbon from the polymer to the nanofibers and sulfur, yielding sulfurized-carbon particles fused to the nanofibers. The pyrolyzed material forms a fluffy powder that is compressed into a free-standing dry film, wherein the nanofibers and longer nanofiber yarns create a three-dimensional conductive network enhancing mechanical stability and electrical conductivity. The film is laminated to a current collector to form a cathode. Optional pore- loading with molecular sulfur improves capacity and cycle life, achieving >70% sulfur utilization without wet processing solvents.

An electrochemical device component comprises at least one electro-spun fibre (1) comprising a core (2) and a sheath (3) surrounding the core. The core (2) comprises particles of an electrode active material (4) held together by a first polymeric material (6), and is electrically conductive along its length. The sheath (3) is formed from a second polymeric material, the second polymeric material being electrically insulating. The core (2) of the at least one electro-spun fibre (1) is arranged to provide a first electrode of an electrochemical device. The sheath (3) of the at least one electro- spun fibre (1) may be arranged to provide a separator between the first electrode and a counter electrode of the electrochemical device.

The present invention discloses a method for preparing fiber electrodes by using a magnet to induce the directional arrangement of Fe3O4@GO, belonging to the field of functional material technology. The present invention first disperses Fe3O4 nanoparticles in a GO suspension, and controls the distribution of Fe3O4 nanoparticles on the surface of GO nanosheets by adding EDA to form a Fe3O4@GO liquid crystal solution; then, the Fe3O4@GO liquid crystal solution is extruded into a coagulation bath through a spinneret of a spinning device, and at the same time, a magnet is used to rotate above the spinneret to drive the Fe3O4@GO to rotate and unfold in the solution for bidirectional directional arrangement, forming Fe3O4@GO gel fiber filaments; finally, drying, stretching, and winding to obtain a fiber electrode. The fiber electrode prepared by the present invention can take into account both electrochemical and mechanical properties, and can be used to prepare fiber-shaped batteries, supercapacitors, etc.

The invention relates to the technical field of fiber batteries, in particular to a fiber battery with electrodes arranged in a honeycomb shape and a preparation method thereof, the preparation method is as follows: fiber electrodes are arranged in a multi-layer mode, fiber positive electrode layers and fiber negative electrode layers are arranged at intervals, and diaphragms are arranged between the fiber positive electrode layers and the fiber negative electrode layers; the fiber positive electrode layer is formed by extending and arranging a plurality of parallel fiber positive electrodes along the axial direction of the fiber battery, and the fiber negative electrode layer is formed by extending and arranging a plurality of parallel fiber negative electrodes along the axial direction of the fiber battery; the fiber positive electrode, the fiber negative electrode and the diaphragm are arranged in at least one stage of shaping mold, then enter at least one stage of reducing mold to be subjected to tightening treatment, then are sleeved with a packaging pipe, and are packaged after electrolyte is injected, so that the fiber battery is obtained. The fiber battery prepared by the invention can keep good flexibility and has higher battery capacity, continuous production can be realized, the production efficiency is improved, and the manufacturing cost is reduced.

Architectural support for an energy storage micro-device comprising: a substrate, micro-pillars arranged on one face of the substrate, each micro-pillar having a free surface, nano-wires, said nano-wires being arranged on the free surface of at least a portion of the micro-pillars, and said face of the substrate being devoid of nano-wires.

The invention relates to a preparation method and application of a ferroferric selenide-diindium triselenide heterostructure carbon-based composite nanofiber material. The preparation method comprises the following steps: firstly, mixing N, N-dimethylformamide and polystyrene nitrile, then adding a polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, stirring to obtain a uniform and transparent solution, then adding ferric acetylacetonate and indium chloride, continuously stirring to obtain an electrostatic spinning precursor solution, transferring the electrostatic spinning precursor solution into an electrostatic spinning medical injector, and carrying out electrostatic spinning to obtain the nano-silver-doped graphene composite material. Spinning on an electrostatic spinning device, and receiving nanofibers obtained by spinning with tin foil. And then carrying out vacuum drying and pre-oxidation on the tin foil substrate loaded with the nanofibers, and then collecting the nanofibers by using a corundum ark for selenylation treatment to obtain the ferroferric selenide-diindium triselenide heterostructure carbon-based composite nanofiber material. The core of the invention is to construct a heterostructure with a synergistic effect. The structure can effectively buffer the volume change in the charge-discharge process and accelerate ion / electron transport kinetics.

The invention discloses an electrostatic spinning porous lithium iron phosphate nanofiber material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The material is of a three-dimensional network structure composed of continuous porous nanofibers, the fibers are composed of carbon-coated lithium iron phosphate nanocrystals, and pores with the pore diameter of 2-100 nm are distributed in the interior and on the surface of the fibers. The preparation method is characterized in that polytetrafluoroethylene (PTFE) is used as a pore-forming agent and a positive electrode electrolyte interface film (CEI) film-forming additive, a two-stage pre-oxidation process is adopted, and lithium iron phosphate is obtained through high-temperature carbon calcination treatment. According to the invention, the cooperation of pore-forming and interface fluorine modification is realized by creatively utilizing PTFE, and the prepared material not only has a rapid electron / ion transmission channel, but also can actively induce to form stable CEI, so that the rate capability, the first coulombic efficiency and the cycle life of the battery are remarkably improved.

The present invention discloses a negative electrode material, a preparation method thereof, and a sodium ion battery. In the present invention, a displacement reaction is carried out on copper-carbon nanofibers, and the copper element in the copper-carbon nanofibers is replaced by elemental tin nanoparticles through ion exchange, realizing the uniform dispersion of the elemental tin nanoparticles in the carbon nanofibers. Through the method of the present invention, a high proportion of the elemental tin nanoparticles can be incorporated into the carbon fibers, and at the same time, the microstructural stability of the elemental tin can be maintained, thereby obtaining a high reversible sodium storage capacity.

When a cable-type battery cell having electrode tabs formed at both ends thereof is manufactured, due to the linear structural characteristics of the cable-type battery cell, as the length of the battery cell increases, the travel distance of electrons from an electrode to the electrode tabs increases, resulting in a problem of low electron mobility due to an increase in the resistance of the battery cell. In order to solve the problem, the present invention relates to a high-flexibility and low-resistance cable-type battery cell without an electrode tab, that is, the cable-type battery cell is configured such that the function of an electrode tab is achieved by exposing an external electrode from a built-in member constituting the outermost side of the cable-type battery cell without forming the electrode tab of the external electrode. High flexibility and low resistance characteristics are achieved by providing the shortest distance path for electrons from the active material layer of the electrode to the electrode tab.