111results about How to "Reduce interfacial resistance" patented technology

An all solid-state polymer battery uses: 1) a lithium based negative electrode active material including crystal grains and crystal grain boundaries, wherein at least part of the crystal grain boundaries are exposed on a surface of the lithium-based negative electrode active material, and the area of the exposed surface of the crystal grain boundaries is 0.02 to 0.5 cm2 per square centimeter of surface; 2) a dry polymer electrolyte including a specific ethylene glycol ether, a polymer containing electron-donating oxygen atoms in the skeleton, and a lithium salt; or 3) an amorphous lithium nitride layer formed between the negative electrode and the polymer electrolyte. This reduces the resistance at the interface between the negative electrode and the polymer electrolyte, thereby providing an all solid-state polymer battery with high capacity and excellent cycle characteristics. This also suppresses an increase in internal resistance during storage, thereby providing an all solid-state polymer battery with excellent high-rate discharge characteristics after storage.

A porous bi-layer separator is composed of a first separator layer with a contacting array of non-conducting particles overlaid with a second separator layer of a microporous polymer layer, fabricated on the electrode surface of the anode of a lithium-ion battery to form an integral electrode-separator construction. Exemplary bi-layer separators may be fabricated by deposition of solvent-containing slurries of separator particles followed by solvent evaporation to produce the particle layer with subsequent application of polymer solutions followed by controlled evaporation of solvent to produce the microporous polymer layer. The elevated temperature performance of lithium-ion battery cells incorporating such integral electrode-bi-layer separators was demonstrated to exceed the performance of similar cells using commercial and experimental single layer polymer separators.

The present invention relates to a polymer blend electrolyte membrane comprising an inorganic polymer having polydimethylsiloxane as a main chain, which has a pore structure at both ends formed by condensation reaction between 3-aminopropyltriethoxysilane and tetraethylorthosilicate, wherein phosphoric acid is chemically linked to an amino group of the pore structure; and a proton-conducting polymer having a cation exchange group at the side chain thereof, as well as a manufacturing method thereof. Generally, proton-conducting electrolyte membranes have significantly reduced ion conductivity at high temperatures. However, proton-conducting electrolyte membranes have advantages in terms of efficiency and cost, and thus it is needed to develop an electrolyte membrane, which has excellent ion conductivity even at high temperature. Accordingly, the present invention aims to provide a polymer blend electrolyte membrane for use at high temperature and a manufacturing method thereof.

A method for pretreating a lithium electrode, and a lithium metal battery, and in particular, a method for stabilizing a lithium electrode through pretreatment of being immersed in a composition for forming a solid electrolyte interphase, and a lithium metal battery including such a lithium electrode. Effects of decreasing interfacial resistance and enhancing Li charge and discharge efficiency are obtained when forming a solid electrolyte interphase (SEI) on a lithium electrode in advance using a pretreatment process of the lithium electrode, and then using the SEI layer-formed lithium electrode in a lithium metal battery.

The invention discloses a polyadipic acid / butylene terephthalate composite material containing modified nanometer microcrystalline cellulose, wherein the material comprises, by mass, 100 parts of polyadipic acid / butylene terephthalate, and 1-20 parts of modified nanometer microcrystalline cellulose, and is prepared sequentially through high speed blending and extrusion granulation, wherein the preparation method of the modified nanometer microcrystalline cellulose comprises: mixing nanometer microcrystalline cellulose and anhydrous ethanol, ultrasonically dispersing to obtain a nanometer microcrystalline cellulose suspension liquid, dissolving a coupling agent in absolute ethanol to form a coupling agent solution, mixing the nanometer microcrystalline cellulose suspension liquid and the coupling agent solution, refluxing for 2-4 h at a temperature of 75-85 DEG C, cooling to a room temperature, carrying out centrifugal separation, and drying to obtain the modified nanometer microcrystalline cellulose. According to the present invention, by organically modifying the nanometer microcrystalline cellulose, the interface resistance can be effectively reduced, the compatibility with the matrix material can be improved, and the modification requirements polyadipic acid / butylene terephthalate can be met.

A solid electrolytic fuel cell having an oxygen electrode layer on one surface of a solid electrolytic layer, having a fuel electrode layer on the other surface thereof, and having a reaction-preventing layer comprising a sintered body of an oxide between the upper surface of the solid electrolytic layer and the oxygen electrode layer for preventing elements from diffusing from the oxygen electrode layer into the solid electrolytic layer, wherein the oxygen electrode layer has a two-layer structure including an inner layer on the side of the reaction-preventing layer and a surface layer on the inner layer; the surface layer of the oxygen electrode layer comprises a sintered body of a perovskite composite oxide; and the inner layer of the oxygen electrode layer comprises a sintered body of a mixture of particles of an oxide for preventing the diffusion of elements and particles of the peroviskite composite oxide, and is formed more densely than said surface layer. The fuel cell has a decreased interfacial resistance between the oxygen electrode layer and the reaction-preventing layer, an increased junction strength between the oxygen electrode layer and the reaction-preventing layer, and generates electricity of a large output.

A metal foil with a karstified topography having a surface morphology in which a maximum peak height minus a maximum profile depth is greater than 0.5 μm and extends into the surface at least 5% of the foil thickness, a root mean square roughness is at least about 0.2 μm measured in a direction of greatest roughness, and an oxygen abundance is less than 5 atomic %. The foil may be composed of aluminum, titanium, nickel, copper, or stainless steel, or an alloy of any thereof, and may have a coating composed of nickel, nickel alloy, titanium, titanium alloy, nickel oxide, titanium dioxide, zinc oxide, indium tin oxide, or carbon, or a mixture or composite of any thereof. The foil may form part of a metal electrode, current collector, or electrochemical interface. Further described is a method for producing the foil by laser ablation in a vacuum.

The invention discloses a molybdenum-doped nickel cobaltate porous yolk-shell-structure material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing a precursor containing Ni, Co and Mo from a nickel salt, a cobalt salt and a molybdenum salt by adopting a solvothermal method, heating the precursor to 490-510 DEG C, and conducting calcining to obtain the molybdenum-doped nickel cobaltate porous yolk-shell-structure material. According to the invention, NiCo2O4 crystal lattices are doped with Mo, so Mo replaces a part of Co<3+> in NiCo2O4; and a porous yolk-shell structure is formed by wrapping a yolk inner core with a shell, the shell has a nanoscale diameter, the sum of the thickness of the shell and the radius of the yolk inner core is smaller than the radius of the porous yolk-shell structure, and the yolk inner core is porous particles. According to the preparation method, the molybdenum-doped nickel cobaltate porous yolk-shell-structure material can be prepared only through a two-step method. The prepared molybdenum-doped nickel cobaltate porous yolk-shell-structure material has better electrochemical performance when used as a lithium ion battery negative electrode material.

The invention relates to an ultra-high performance cement-based composite material for a sensor, the sensor and a preparation method thereof, and belongs to the technical field of civil engineering materials, and the ultra-high performance cement-based composite material comprises cement, fly ash, quartz sand, fibers, a water reducing agent, starch gel, water, carbon nanotubes, graphite powder anda surfactant. The tensile strain of the ultra-high-performance cement-based composite material is 3% or above; the defects of brittleness, low tensile strength, poor toughness, easiness in cracking and the like of a common cement-based material are overcome; the strain monitoring range of the manufactured sensor is far larger than that of a sensor made of a common smart cement-based material; thecarbon nano tube and the graphite powder are used as conductive phase materials, the manufacturing cost is low, the sensor is good in compatibility with a concrete structure, excellent in conductivity and smart, stable and reliable in performance, long in service life and easy to manufacture, and due to the addition of the starch gel, shrinkage deformation of the composite material is greatly reduced.

The invention discloses a Ni / CeO2NP@PANI core-shell structural composite material and a preparation method thereof. The method comprises the following steps: firstly, Ni / CeO2 NPs are prepared througha hydrothermal method; and then aniline is polymerized on the surfaces of the Ni / CeO2 NPs by adopting a chemical oxidation polymerization method, and in the polymerization process of the aniline, through changing a concentration of HCl, conversion from a Ni / CeO2NP@PANI core-shell structure to a spaced Ni / CeO2NP@PANI core-shell structure to PANI hollow spheres is realized. In the process, templatesare not needed, the method is green and environmentally friendly, the preparation method is simple, the preparation process is safe, the energy consumption is low, and the operability is strong; andthe Ni / CeO2 NPs prepared by the method have rough surfaces, so that the specific surface area can be increased to increase the contact area of the Ni / CeO2 NPs and the PANI, and the diffusion of ions and electrons can be promoted to effectively improve the electrochemical performance.