86results about "Microscopic fiber electrodes" patented technology

A lithium ion battery electrode includes silicon nanowires used for insertion of lithium ions and including a conductivity enhancement, the nanowires growth-rooted to the conductive substrate.

A composite composition for electrochemical cell electrode applications, the composition comprising multiple solid particles, wherein (a) a solid particle is composed of graphene platelets dispersed in or bonded by a first matrix or binder material, wherein the graphene platelets are not obtained from graphitization of the first binder or matrix material; (b) the graphene platelets have a length or width in the range of 10 nm to 10 μm; (c) the multiple solid particles are bonded by a second binder material; and (d) the first or second binder material is selected from a polymer, polymeric carbon, amorphous carbon, metal, glass, ceramic, oxide, organic material, or a combination thereof. For a lithium ion battery anode application, the first binder or matrix material is preferably amorphous carbon or polymeric carbon. Such a composite composition provides a high anode capacity and good cycling response. For a supercapacitor electrode application, the solid particles preferably have meso-scale pores therein to accommodate electrolyte.

A battery on a conductive metal wire and components of a battery on a conductive metal wire of circular cross section diameter of 5-500 micrometers and methods of making the battery and battery components are disclosed. In one embodiment, the battery features a porous anode or cathode layer which assist with ion exchange in batteries. Methods of forming the porous anode or cathode layer include deposition of an inert gas or hydrogen enriched carbon or silicon layer on a heated metal wire followed by annealing of the inert gas or hydrogen enriched carbon silicon layer. Energy storage devices having bundles of batteries on wires are also disclosed as are other energy storage devices.

Stretchable electrochromic devices are disclosed including a stretchable electrochromic substrate; and a stretchable and transparent polymeric electrolyte coating or impregnating the stretchable electrochromic substrate. The stretchable electrochromic devices can find utility in the preparation of wearable electronic garments. Other devices using a stretchable and transparent polymeric electrolyte are disclosed.

A surface-mediated, lithium ion-exchanging energy storage device comprising: (a) A positive electrode (cathode) comprising a cathode active material that is not a functional material (bearing no functional group reactive with lithium), but having a surface area to capture or store lithium thereon; (b) A negative electrode (anode) comprising an anode active material having a surface area to capture or store lithium thereon; (c) A porous separator disposed between the two electrodes; and (d) A lithium-containing electrolyte in physical contact with the two electrodes, wherein the anode active material and/or the cathode active material has a specific surface area of no less than 100 m²/g in direct physical contact with the electrolyte to receive lithium ions therefrom or to provide lithium ions thereto; wherein at least one of the two electrodes contains therein a lithium source prior to a first charge or a first discharge cycle of the energy storage device. This new generation of energy storage device exhibits the best properties of both the lithium ion battery and the supercapacitor.

The invention, which belongs to the technical field of the micro energy storage device, particularly relates to a stretchable linear supercapacitor and a lithium ion battery preparation method. A spring-like oriented carbon nanotube fiber is prepared and is twisted to form a spiral unit, wherein the spiral unit can be stretched by over 300%; and then the processed fiber is used as the electrode to construct a stretchable supercapacitor. Moreover, the fiber can be combined with lithium manganate and lithium titanate nano particles to form composite fibers respectively used as the positive electrode and the negative electrode; and thus a stretchable lithium ion battery can be constructed. According to the invention, compared with other micro devices, the stretchable linear supercapacitor and stretchable linear lithium ion battery have novel structures. The stretching function can be realized without the need of an elastic substrate, thereby reducing the weight and size of the device and improving the specific capacity and the energy density of the device and thus providing the important innovation for the micro device field. Meanwhile, the supercapacitor and the battery having high flexibility are easy to manufacture and integrate and have good application prospects.

The present invention relates to a method of preparing a porous silicon nanorod structure composed of columnar bundles having a diameter of 50-100 nm and a length of 2-5 μm, and a lithium secondary cell using the porous silicon nanorod structure as an anode active material. The present invention provides a high-capacity and high-efficiency anode active material for lithium secondary cells, which can overcome the low conductivity of silicon and improve the electrode deterioration attributable to volume expansion because it is prepared by electrodepositing the surface of silicon powder with metal and simultaneously etching the silicon powder partially using hydrofluoric acid.

A composite anode active material, an anode including the composite anode active material, a lithium battery including the anode, and a method of preparing the composite anode active material. The composite anode active material includes: a shell including a hollow carbon fiber; and a core disposed in a hollow of the hollow carbon fiber, wherein the core includes a first metal nanostructure and a conducting agent.

The present invention provides a method of efficiently fabricating a large number of fiber electrodes at the same time from a large number of fibers while taking advantage of inherent characteristics of fiber electrodes.

A fiber electrode fabrication method according to the present invention includes: a step (2, 2a) of spreading a fiber tow; a step (3, 4, 5) of obtaining fiber positive electrodes or fiber negative electrodes by forming a positive electrode active material coating or a negative electrode active material coating on each of single fibers that are obtained by spreading the fiber tow; and a step (6, 6a) of forming a separator coating on the fiber positive electrodes or the fiber negative electrodes.

Provided are electrode layers for use in rechargeable batteries, such as lithium ion batteries, and related fabrication techniques. These electrode layers have interconnected hollow nanostructures that contain high capacity electrochemically active materials, such as silicon, tin, and germanium. In certain embodiments, a fabrication technique involves forming a nanoscale coating around multiple template structures and at least partially removing and/or shrinking these structures to form hollow cavities. These cavities provide space for the active materials of the nanostructures to swell into during battery cycling. This design helps to reduce the risk of pulverization and to maintain electrical contacts among the nanostructures. It also provides a very high surface area available ionic communication with the electrolyte. The nanostructures have nanoscale shells but may be substantially larger in other dimensions. Nanostructures can be interconnected during forming the nanoscale coating, when the coating formed around two nearby template structures overlap.

A photoelectric conversion element including: (1) a window electrode having a transparent substrate and a semiconductor layer provided on a surface of the transparent substrate, a sensitizing dye being adsorbed on the semiconductor layer; (2) a counter electrode having a substrate and a conductive film, provided on a surface of the substrate, that is arranged so as to face the semiconductor layer of the window electrode, and wherein the counter electrode has carbon nanotubes provided on the substrate surface via the conductive film; and (3) an electrolyte layer disposed at least in a portion between the window electrode and the counter electrode.

The invention discloses a lithium titanate-carbon nanometer fiber flexible non-woven fabric, a preparation method and applications thereof. The preparation method comprises: dissolving a lithium source in a titanium source dispersion liquid, carrying out a hydrothermal reaction to obtain lithium titanate precursor nanoparticles with uniform size, dispersing the lithium titanate precursor nanoparticles in polyacrylonitrile/dimethylformamide, and carrying out electrospinning and high-temperature calcination to finally obtain the lithium titanate-carbon nanometer fiber flexible non-woven fabric.According to the present invention, with the method, the proportion of lithium titanate in the composite material can be substantially increased so as to improve the specific mass capacity of the whole lithium titanate battery; and the inexpensive raw materials are used, and the particles are directly and simply dispersed in the sol to be spin, such that the spinning method is suitable for industrial mass production.

The present invention discloses a wire structure carbon fiber / MoS2 / MoO2 flexible electrode material and a preparation method thereof, and belongs to the field of electrochemistry and new energy materials. The inner layer of the electrode material is carbon fiber, the intermediate layer is MoS2, the outermost layer is MoO2, and the electrode material is a three-layer-covered wire structure. The inner layer carbon fiber is used as an electron and ion transmission path, and the intermediate layer MoS2 provides high capacity, and the outer layer MoO2 coating can not only improve the capacity of the material, but also improves the conductivity of the material. The wire structure material is used as a negative electrode material of a lithium ion battery. Wet paper towel is treated by removing impurity, and calcined at high temperature, and the wet paper towel is carbonized at high temperature to form the flexible carbon fiber, and then the carbon fiber / MoS2 composite is formed by hydrothermal reaction with sodium molybdate and thiourea. The composite material is further calcined in oxygen at low temperature in oxygen to form the wire structure carbon fiber / MoS2 / MoO2 flexible electrode material. The three-layer-covered wire structure significantly improves the specific capacity and cycle stability of the material.

The invention discloses a preparation method of a nitrogen and oxygen co-doped carbon nanofiber material, and relates to the technical field of nano materials. The preparation method comprises the following steps of (1) preparing a precursor; and (2) putting the precursor into a tubular furnace filled with nitrogen, respectively calcining at 600-800 DEG C for 2 hours, naturally cooling to room temperature to obtain MnO nanocrystals embedded with nitrogen-doped porous carbon, finally etching the sample with a 3mol/L hydrochloric acid solution for 3 hours, and washing to obtain the nitrogen-oxygen co-doped carbon nanofiber material. The invention also provides a product prepared by the preparation method and an application thereof. The beneficial effects of the present invention are that thepreparation process is simple and efficient, is safe and easy to implement and is short in synthesis period and is expected to be popularized and industrially produced, and the prepared nanofiber material has a loose and porous composite structure.

The invention belongs to the field of lithium ion batteries, and discloses a preparation method of nitrogen-doped porous carbon coated silicon composite nanofibers. The method comprises the followingsteps: (1) electrostatic spinning: mixing a polymer binder, nano silicon powder and a solvent to obtain a spinning solution, and carrying out electrostatic spinning to obtain a precursor nanofiber membrane; (2) in-situ polymerization coating of polypyrrole: adsorbing elemental iodine on the surface of the precursor nanofiber membrane by a gas phase method, then adsorbing a pyrrole monomer, and carrying out a polymerization reaction to obtain composite nanofibers; (3) heat treatment: calcining the composite nanofibers in a protective atmosphere. According to the preparation method, polypyrrolecoating is more uniform in the gas-phase adsorption in-situ polymerization polypyrrole coating process, uniform nitrogen-doped porous carbon coated silicon particle composite nanofibers are obtained after heat treatment, and the method is simple, convenient and reliable in production process, cheap and easily available in raw materials, low in equipment requirement and easy to realize large-scaleproduction.