12results about "Microscopic fiber electrodes" patented technology

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.

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 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 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.

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.