45results about How to "Increase electrode capacity" patented technology

Provided are an electrode for a secondary battery employing an active material layer having improved thickness uniformity by printing low-viscosity ink on the active material layer, a manufacturing method of the electrode, and a secondary battery having improved electrode capacity due to the employing of the electrode. The electrode includes a current collector, and an active material layer formed by printing ink having a viscosity not exceeding 500 mPa·s on the current collector and drying the current collector, wherein the current collector has a surface roughness (Ra) in a range from about 0.025 to 1.0 μm.

Electrochemical cells containing nanostructured negative active materials and composite positive active materials and methods of fabricating such electrochemical cells are provided. Positive active materials may have inactive components and active components. Inactive components may be activated and release additional lithium ions, which may offset some irreversible capacity losses in the electrochemical cells. In certain embodiments, the activation releases lithium ion having a columbic content of at least about 400 mAh/g based on the weight of the activated material.

An electrode material of Fe¿CLi phosphate and its composite metal phosphate is electrode material of LiFePO4 and LiFePO4 / MxP in high density spherical shape with diameter of 2micro m. The electrode material of LiFePO4 and LiFePO4 / MxP can be prepared by low ¿C temperature controllable one ¿C stage atomizing process in short flow.

The invention provides a preparation method with polysaccharide modified activated carbon as a supercapacitor electrode material. Firstly, a polysaccharide thermal reaction is carried out to obtain a carbon ball, then the carbon ball and potassium hydroxide are mixed and soaked such that the potassium hydroxide is fully diffused into a carbon material, and finally the mixture is subjected to high-temperature calcinations such that the carbon ball is activated by the potassium hydroxide to obtain an activated carbon material. The polysaccharide modified activated carbon material prepared by using the method has the advantages of rich level pore structures and a large specific surface area, as a supercapacitor electrode material, the electrode capacity is high to 510F/g, and the method has the advantages of simple process operation, high reproducibility and low cost.

The invention discloses an electrode preparation method and a battery. The battery anode is prepared by pasting an electrode film prepared from an active substrate, a conductive agent and a binder toa current collector, the surface density of a pole piece is improved, the electrode capacity and the pole piece stability are improved, and the internal resistance is reduced. In the preparation process of the electrode film, lamellar crystals of the binder are stretched to paste the active substance and conductive agent, influence of expansion and contraction of the active substance caused by ionembedding and separating is reduced. The battery cathode is prepared by coating a slurry prepared from a pre-lithium active substance, a binder and a conductive agent on the current collector, the active substrate and conductive agent of the cathode are wetted rapidly, dispersed ultra-finely and homogeneous in a binder solution, the amount of the solvent for slurry dispersion is reduced, energy consumption for drying is reduced, the electrode process is shortened, and the load capacity of the cathode active substance is improved. The anode and cathode of the battery can be designed in an integrated way, and energy storage of the battery is improved. The electrode preparation method is simple, production and manufacture are realized by means of existing equipment, and the method is easy topopularize.

Improved flow through capacitors (FTC) and methods for purifying aqueous solutions are disclosed. For example, FTC electrodes that are activated with a poly-electrolyte are disclosed.

[Problem]

Provided is a negative electrode active material for an electric device which exhibits a well-balanced property of maintaining a high cycle property and attaining a high initial capacity.

[Technical solution]

The negative electrode active material for an electric device comprising an alloy having a composition formula Si_xZn_yAl_z (where each of x, y, and z represents amass percent value, satisfying (1) x+y+z=100, (2) 21≦x<100, (3) 0<y<79, and (4) 0<z<79).

The invention discloses a preparation technology of a nitrogen-doped mesoporous carbon composite metal oxide electrode material for a supercapacitor, wherein the preparation method comprises the following steps of firstly, taking a mesoporous molecular sieve SBA-15 as a template agent, taking carbohydrate as a carbon source, and taking urea and hexamethylenetetramine as a nitrogen sources, performing calcining by inert gas, and removing the template agent to obtain nitrogen-doped mesoporous carbon; then, adding a metal salt solution, introducing inert gas for calcining to obtain a nitrogen-doped mesoporous carbon composite metal oxide composite material; and then mixing the material with polytetrafluoroethylene (PTFE) ) and the carbon black and then performing coating, pressing and dryingto obtain the nitrogen-doped mesoporous carbon composite metal oxide electrode material for the supercapacitor. The preparation method disclosed by the invention is low in cost and simple and convenient to operate. The nitrogen-doped mesoporous carbon prepared by the method disclosed by the invention is clear in pore passage and appropriate in pore size, the specific surface area is large, the distribution of the transition metal oxide nano particles is uniform, and the loading capacity is large. The electrochemical performance of the nitrogen-doped mesoporous carbon composite metal oxide electrode material is excellent, so that the electrode material has a wide market prospect in the field of energy storage materials such as supercapacitors and the like.

[Problem]

Provided is a negative electrode active material for an electric device which exhibits a well-balanced property of maintaining a high cycle property and attaining a high initial capacity.

[Technical solution]

The negative electrode active material for an electric device comprising an alloy having a composition formula Si_xTi_yZn_z (where each of x, y, and z represents amass percent value, satisfying (1) x+y+z=100, (2) 38≦x<100, (3) 0<y<62, and (4) 0<z<62).

The invention discloses a tin dioxide/porous carbon composite lithium battery negative electrode material and a preparation method. The preparation method comprises the following steps: with fibroin and a high molecular polymer PAMAM as precursors, soaking a fibroin/PAMAM composite material after freeze drying treatment in a stannous sulfate aqueous solution for sufficient adsorption; performing high-temperature calcination to obtain the lithium battery negative electrode material. Sn<2+> and amino groups (mainly tertiary amino groups) in the PAMAM dendrimer can generate an effective complexing action so that the SnO2 nanoparticles are in-situ compounded on the surface of the fibroin/PAMAM; therefore, the yield of tin dioxide/porous carbon compound is higher, the uniform stability is better, and a lithium ion battery negative electrode material with high specific capacity and long cycle life is prepared finally.

The invention discloses a Sn-Co/C alloy cathode material of a lithium ion battery and a preparation method thereof. The preparation method comprises the steps: uniformly mixing Sn powder and Co powder according to the mass ratio of (99:1) to (97:3), melting the mixture of the Sn powder and the Co powder, and carrying out spraying cooling to obtain a Sn-Co composite material; then adding an acid solution with the concentration being 1-3mol/L into a Sn-Co composite material for acid treatment to obtain a Sn-Co material subjected to the acid treatment; and mixing and sintering the Sn-Co material with an organic carbon source and asphalt in sequence to obtain an Sn-Co/C alloy cathode material. According to the invention, by adoption of acid etching, primary carbon coating based on the organic carbon source and secondary carbon coating based on the asphalt, the electrode is limited in expansion while being endowed with an expansion space, so that the material is prevented from being pulverized in a discharge/charge process. The prepared Sn-Co/C alloy cathode material is a solid solution alloy, has excellent mechanical strength, is free from the problem of electrode capacity reduction caused by the material itself, is improved in cyclic performance and electrode capacity at the same time, and has the advantages of high charge/discharge capacity and good cyclic performance.

The invention discloses a carbon-based binder-free composite material as well as a preparation method and application thereof, and belongs to the technical field of carbon material preparation. The carbon-based binderless composite material comprises a matrix, a carbon film and structural carbon. The carbon film is loaded on the surface of the matrix, and the structural carbon integrally formed with the carbon film grows on the carbon film. Alkali metal and alkaline earth metal catalysts are added in the preparation process, so that a carbon source is deposited on the surface of the matrix toform an integrally formed carbon film and structural carbon, the use of a binder is avoided, the effective specific surface area of the composite material is increased, the bonding strength and electrical contact performance of the carbon material and the matrix are improved, the electron, ion and atom transmission and chemical structure characteristics of the surface of the material are modified,and the composite material with excellent physical and chemical properties is prepared. The composite material prepared by the invention can be used for various battery electrodes, capacitor electrodes, various sensor electrodes, solar cell electrodes, water electrolysis hydrogen production electrodes, hydrogen storage materials, catalysts, catalyst carriers, composite material reinforcing materials and the like.

In a mercury free arc tube provided with a sealed glass chamber in which at least metallic halide for main light emission is sealed as well as rare gas by pinch-sealing both end openings of a glass tube and electrode bars are opposite to each other, the tip of a region projecting into the sealed glass chamber of each the electrode bars is formed of a single crystal. Owing to repetition of ON/OFF of the arc tube, the crystal at the tip of the electrode bar grows but the shape of the electrode end face formed of the single crystal remains unchanged. Further, even if the tip of the electrode bar is gradually consumed by thermal load acting on the tip of the electrode bar, the entire shape of the electrode end face is consumed nearly uniformly so that decline of the luminescent spot does not occur during discharging.

The present invention relates to an electrochemical cell having a channel-type flow-electrode unit.

The channel-type flow-electrode structure according to the present invention, which has at least two channel-type flow-electrode units, can significantly reduce manufacturing costs and installation space by reducing the number of parts while extending the electrode capacity to be suitable for large-scale plants for electricity generation, energy storage, desalination, etc. In addition, the channel-type flow-electrode structure can be applied not only to a capacitive flow-electrode device and/or a redox flow battery device, but also to all of the devices for electricity generation, energy storage, and desalination while moving ions or protons.

The invention relates to a preparation method of an electrode material, and specifically relates to a method for improving electrode capacity through in-situ coated conductive macromolecule, and belongs to the technical field of the electrochemistry. The method comprises the following steps: mechanically mixing and ball-milling the powdery battery material and the carbon at first, and then tableting the mixed material which is used as a positive electrode material to be assembled into the battery, charging the positive electrode material to 3-4.2V, and then taking out the charged electrode material and placing in the water solution containing the conductive macromolecule monomer and the surfactant to soak, taking out the soaked electrode to clean, and drying to obtain the electrode material with the in-situ coated conductive macromolecule. The electrode material can be applied to the lithium and sodium ion battery, and the battery capacity is greatly improved, and the preparation method is simple and easy to operate.

Problem: To provide a lithium secondary battery negative electrode active material consisting of a Sn—Sb based sulfide that delivers a high electrode capacity density, excellent output characteristics, and excellent cycle life characteristics and also provide a method for manufacturing the lithium secondary battery negative electrode active material, said method being capable of easily manufacturing the high performance lithium secondary battery negative electrode active material at low cost without requiring a high-temperature processing step and special facilities as required in a glass melting method.

Solution: A method for manufacturing a lithium secondary battery negative electrode active material containing a Sn—Sb based sulfide comprises a step of obtaining a Sn—Sb based sulfide precipitate by adding an alkali metal sulfide to a mixed solution of a tin halide and an antimony halide.

An arc tube includes a light emitting body for light therein and a ceramic tube having a first capillary and a second capillary integral with respective opposite sides of the light emitting body. A first electrode is inserted and sealed in the first capillary, and a second electrode is inserted and sealed in the second capillary. The first electrode is sealed in the first capillary by shrink fitting.

The invention belongs to the field of battery energy, and particularly relates to a preparation method of a binder-free lithium ion battery negative electrode material. The method comprises the following steps that: step 1, under the protection of argon, direct sintering and ball-milling are performed waste silicon powder generated by single crystal cutting; step 2, sodium silicate is added into an obtained product so as to be mixed with the product, ammonium chloride is added, and ball milling and drying are performed; 3, asphalt is added, and sintering is performed; 4, hydrofluoric acid soaking treatment is conducted, and washing is conducted until a product is neutral; 5, nano titanium dioxide particles are added, and carbon nanotubes are added, and ball milling is performed; and 6, tabletting is performed through a tabletting machine, so that the flaky silicon-based lithium ion battery negative electrode material can be obtained.