20 results about "Surface conductivity" patented technology

The invention discloses a niobium-doped and carbon nanotube continuously coated lithium iron nickel phosphate material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The niobium source and the phosphorus source are added step by step, the concentration gradient distribution of the niobium element in the material is realized, and niobium is preferentially doped in the [100] crystal orientation through three-section temperature control sintering, so that the bulk phase conductivity and the lithium ion mobility are remarkably improved, and the capacity loss caused by excessive doping is avoided while the lattice structure is stabilized. In addition, the carbon nanotubes and the nitrogen-containing carbon source have a synergistic effect, Li-N-C covalent bonds are formed on the surface of the material, the interface stability is enhanced, the interface side reaction is effectively inhibited, and the surface conductivity is improved. According to the method, through double modification of doping and coating, the problems of low conductivity and poor cycling stability of the lithium iron nickel phosphate material are successfully solved, and the final product shows excellent rate capability and long cycle life.

This enables improved (enhanced) charge trapping capability and suppression of parasitic surface conductivity within the wafer structure. [Solution] The wafer structure 240 includes a trap-rich layer 214 bonded to a handle wafer 224 such that the grain structure within the trap-rich layer 214 becomes coarser adjacent to the handle wafer 224, and the grain size within the grain structure decreases away from the handle wafer 224, thereby improving the trapping efficiency of the wafer structure 240 within the trap-rich layer 214 at the interface (IF) toward the top wafer. A method for manufacturing the wafer structure 240 includes the steps of depositing a trap-rich layer 214 on a top wafer 204 and bonding a handle wafer 224 onto the top wafer 204 such that the trap-rich layer 214 is located between the top wafer 204 and the handle wafer 224.

This enables improved (enhanced) charge trapping capability and suppression of parasitic surface conductivity within the wafer structure. [Solution] The wafer structure 232 includes a trap-rich layer 214 bonded to a handle wafer 224 such that the grain structure within the trap-rich layer 214 becomes coarser adjacent to the handle wafer 224, and the grain size within the grain structure decreases away from the handle wafer 224, thereby improving the trapping efficiency of the wafer structure 232 within the trap-rich layer 214 at the interface (IF) toward the top wafer. A method for manufacturing the wafer structure 232 includes the steps of depositing a trap-rich layer 214 on a top wafer 204 and bonding a handle wafer 224 onto the top wafer 204 such that the trap-rich layer 214 is located between the top wafer 204 and the handle wafer 224.

This invention provides a device and method for testing the surface conductivity of conductive wires in the millimeter-wave to terahertz frequency band, belonging to the field of surface conductivity testing technology. The testing device is designed based on a double-concave quasi-optical cavity and innovatively utilizes the differentiated multi-mode of the quasi-optical cavity to accurately extract key geometric and electrical parameters of the conductive wire: the electric field of the symmetric mode is concentrated on the cavity axis, and the radius of the conductive wire at this position directly affects the coupling volume with the electric field. Therefore, the frequency shift of the symmetric mode is used to calculate the precise radius of the conductive wire based on the principle of shape perturbation; the antisymmetric mode has a zero electric field at the axis and is more sensitive to surface loss. The quality factor variation value is determined using the antisymmetric mode. Finally, based on the cavity wall impedance perturbation theory, combined with the radius and quality factor, the surface conductivity of the conductive wire is measured, achieving accurate measurement of the surface conductivity of a single fine conductive wire in the millimeter-wave to terahertz frequency band.

The invention discloses a second harmonic enhancement method, a semiconductor-graphene nonlinear composite structure is adopted, the semiconductor-graphene nonlinear composite structure comprises at least two anisotropic nano-particles wrapped by graphene, a gap is arranged between every two nano-particles, and the gaps are arranged between every two adjacent nano-particles. The surface conductivity of graphene is composed of in-band conductivity and inter-band conductivity, and the second harmonic scattering efficiency is enhanced by three orders of magnitude through the near-field coupling characteristic between two graphene wrapped nanoparticles. According to the invention, the coupling characteristic between two graphene-coated nano-particles is utilized, so that the enhancement of second harmonic scattering up to 3 orders of magnitude is realized.

The present application relates to the technical field of laundry treatment. Provided is a laundry treatment apparatus. The laundry treatment apparatus comprises a laundry accommodating drum, a lifting rib, and an electrical conductivity measurement device, wherein the laundry accommodating drum has a laundry accommodating cavity; the lifting rib is arranged in the laundry containing cavity; and at least part of the electrical conductivity measurement device is arranged on the outer surface of the lifting rib. At least part of the electrical conductivity measurement device is arranged on the outer surface of the lifting rib, and the electrical conductivity measurement device can be in contact with loads such as laundry in the laundry accommodating cavity, thereby sensing the drying degree of the laundry at a short distance, and the accuracy of determining the drying degree of the laundry in the laundry accommodating drum is thus effectively improved.

Disclosed herein is a titanium plate with excellent surface conductivity and excellent durability. The titanium plate for a fuel cell separator according to the present disclosure includes: a titanium (Ti) base material including, in mass%, Si: 0.001 to 0.09%, a remainder Ti, and inevitable impurities; and a surface coating layer in which a content of each of Ti, Si, and O exceeds 0% when measured by angle-resolved X-ray photoelectron spectroscopy using an Al-Kα X-ray source under a condition where a photoelectron takeoff angle is 45°. The surface coating layer satisfies a following formula (1): 0.2≤Siat.% / Tiat.%+Siat.%≤0.8

This invention belongs to the field of flow batteries, specifically relating to a high-strength flexible bipolar plate and its preparation method. The method includes: electrospinning and carbonizing a spinning solution containing polyacrylonitrile, metal salts, and organic acids to obtain carbon fiber filaments; extruding and granulating materials such as PE, EPDM, carbon black, and antioxidants, followed by crushing and grinding to obtain elastomer powder; dissolving polyimide in DMF, adding EPDM-PE powder, and then ultrasonically dispersing and vacuum distilling to obtain a concentrated solution of polyimide-coated EPDM-PE core-shell structure; and hot-pressing the concentrated solution with carbon fiber filaments and graphite, respectively. The bipolar plate prepared by this invention possesses high strength, high conductivity, and good flexibility, with a tensile strength ≥40MPa, surface conductivity ≥256S / cm, and bulk resistance ≤10mΩ·cm². After 100 cycles in a vanadium redox flow battery, its energy efficiency is ≥82.1%, making it suitable for high-performance flow batteries.

The present invention aims to provide a fuel cell separator material that simultaneously ensures manufacturing cost, conductivity, and durability by adjusting the composition of the titanium (Ti) base material and easily forming a conductive oxide layer on the surface coating layer, and does not require additional coating. [Solution] A titanium separator plate material with excellent surface conductivity and durability is disclosed. The titanium plate material for a fuel cell separator plate according to the present invention comprises a Ti base material consisting of, by mass%, 0.001 to 0.09% Si, the remainder Ti, and unavoidable impurities, and a surface coating layer in which the contents of Ti, Si, and O measured by X-ray angle-resolved photoelectron spectroscopy using an Al-Kα X-ray source at a photoelectron takeoff angle of 45° are each greater than 0%. The surface coating layer is characterized by satisfying the following formula (1): Formula (1): 0.2 ≦ Si(at.%) / [Ti(at.%)+Si(at.%)] ≦ 0.8

Disclosed is a titanium plate for a fuel cell separator, which has excellent surface conductivity and durability. The titanium plate for a fuel cell separator according to the present invention comprises a base metal and a surface oxide layer, the base metal comprising, by weight%, 0.001-0.09% of Si, 0.065% or less of Fe, and the balance of Ti and unavoidable impurities; the surface oxide layer contains, by weight%, 0.20% or less of Si, 0.20% or less of O, and the balance of Ti and unavoidable impurities. Wherein the surface oxide layer may satisfy formula (1) at a point where the weight% of O is a maximum value. Formula (1): 0.05 < = Si / (Ti + O) < = 0.4 wherein Si, Ti, and O represent the content (wt%) of each element.

The present invention aims to provide a fuel cell separator material that simultaneously ensures manufacturing cost, conductivity, and durability by adjusting the composition of the titanium (Ti) base material and easily forming a conductive oxide layer on the surface coating layer, and does not require additional coating. [Solution] A titanium separator plate material with excellent surface conductivity and durability is disclosed. The titanium plate material for a fuel cell separator plate according to the present invention comprises a Ti base material consisting of, by mass%, 0.001 to 0.09% Si, the remainder Ti, and unavoidable impurities, and a surface coating layer in which the contents of Ti, Si, and O measured by X-ray angle-resolved photoelectron spectroscopy using an Al-Kα X-ray source at a photoelectron takeoff angle of 45° are each greater than 0%. The surface coating layer is characterized by satisfying the following formula (1): Formula (1): 0.2 ≦ Si(at.%) / [Ti(at.%)+Si(at.%)] ≦ 0.8

The invention provides a doped and coated modified lithium-rich manganese-based positive electrode material, a preparation method thereof and a battery, and the preparation method comprises the following steps: merging a manganese-rich mixed salt solution, an alkaline solution and an EDTA (Ethylene Diamine Tetraacetic Acid) solution, injecting into a base solution to prepare a precursor, mixing the precursor with a tantalum source, a tungsten source and a magnesium source, and carrying out solvothermal reaction to obtain a doped precursor; and mixing the doped precursor with a lithium source, carrying out sintering treatment to obtain a lithium-rich material, mixing the lithium-rich material with the lithium tantalate sol, evaporating a solvent, and carrying out calcination treatment to obtain the doped and coated modified lithium-rich manganese-based positive electrode material. According to the invention, the lithium-rich manganese-based positive electrode material is doped, coated and modified, so that the two core problems of unstable bulk phase structure and unstable surface interface of the lithium-rich manganese-based positive electrode material are solved, the surface conductivity of the material is improved, and the dissolution of transition metal ions is inhibited.

The application belongs to the technical field of flexible electronic micro-nano manufacturing, and discloses a plasma-assisted insulating surface electrohydrodynamic jetting method and application, which comprises the following steps: modifying the surface of an insulating substrate by using plasma to inject active groups into the surface of the insulating substrate to improve the surface conductivity and bulk conductivity of the insulating substrate, and then performing electrohydrodynamic jetting; wherein the surface of the insulating substrate treated by plasma forms a coral-like structure. The plasma modification treatment changes the micro-nano structure of the surface of the insulating substrate, injects active groups into the surface of the insulating substrate, changes the charge trap energy level distribution of the surface of the insulating substrate, improves the surface conductivity and bulk conductivity of the insulating substrate, these changes inhibit the accumulation of charges on the insulating surface and accelerate the dissipation of charges, eliminate the distortion of the electric field, and thus optimize the electrohydrodynamic jetting effect on the surface of the insulating substrate.

The present application relates to a kind of based on PTFE silica gel composite porous elastic skeleton piezoresistive film and its preparation method, including composite porous elastic film substrate and gradient conductive layer, the composite porous elastic film substrate is by the three-dimensional porous skeleton of modified PTFE fiber and the solidified silica gel elastomer of optional coating in the fiber intersection node of this porous skeleton, the gradient conductive layer is for covering from the inside of composite porous elastic film substrate to surface, the three-section gradient conductive layer of gradually increasing electrical conductivity.In 50000 times cyclic compression, elastic recovery rate still keeps 94% or more, resistance signal drift≤3%, it is especially suitable for being applied to the robot dexterous hand tactile system of extremely high reliability and durability requirement.

The present application relates to a kind of high-conductivity fingerprint-resistant galvanized sheet and its production method, strip steel chemical composition is C:0.001%~0.460%, Si:0.01%~0.80%, Mn:0.20%~2.60%, Cr:0.01%~0.50%, Mo:0.01%~0.25%, Ni≤0.10%, Cu≤0.10%, Nb≤0.500%, Ti≤0.300%, V≤0.008%, B≤0.005%, Al:0.015~0.045%, N≤0.004%, P≤0.080%, S≤0.012%, the rest is Fe and impurity;The surface of strip steel is plated with fingerprint-resistant film.For different thickness, different strength grade strip steel, accurately control the finishing rolling force, surface roughness and fingerprint-resistant film weight;Air-cooled film is used, and for different thickness of strip steel, accurately control the plate temperature after drying, the plate temperature after cooling in rising section, the plate temperature after cooling in horizontal section and the plate temperature after cooling in falling section;Finally, the surface conductivity of fingerprint-resistant galvanized sheet product is improved.

The invention provides a long carbon chain modified PA66 composite material and a preparation method thereof, and belongs to the field of high polymer material modification. Long carbon chain molecules containing both quaternary ammonium salt cation groups and siloxane groups are combined with functional nanoparticles, co-grafting modification is carried out on the surfaces of PA66 molecules pre-grafted with amino acid, and the PA66 composite film with the super-hydrophobic function and the anti-static performance at the same time is prepared. The problems that an existing PA66 material is high in hygroscopicity and poor in antistatic capacity and cannot be applied to the fields of high-end electronics and semiconductors are solved. The long-carbon-chain modified PA66 composite material prepared by the invention has excellent super-hydrophobicity and antistatic property, can keep stable surface conductivity in different humidity environments, still keeps stable after physical friction and solution erosion, is simple in preparation process, is suitable for large-scale production and application, and shows very high development potential.

This invention belongs to the field of lithium battery technology and discloses a lithium-rich manganese cathode material with a nanoporous structure, comprising a lithium-rich manganese cathode material matrix and a fluorocarbon organic compound coating layer on the surface of the matrix. The lithium-rich manganese cathode material matrix has a nanoporous structure layer near the fluorocarbon organic compound coating layer. This nanoporous structure can effectively improve the wettability of the material with the electrolyte, increase the utilization rate of lithium-rich manganese active material, reduce uneven polarization inside the electrode, and alleviate internal stress; however, it will also reduce the structural stability of the material and increase the gas generation and water absorption of the material. Therefore, this invention also includes fluorocarbon organic compound coating, which can improve the structural stability and surface stability of the material, increase the surface conductivity of the material, and reduce the surface water absorption of the material. The synergistic effect of the two can effectively solve the problems of low initial coulombic efficiency, rapid capacity and voltage decay, poor rate performance, and severe gas generation at high temperatures in lithium-rich manganese cathode materials.

The invention provides a composite modified lithium-rich manganese-based positive electrode material, a preparation method thereof and a battery, and the preparation method comprises the following steps: mixing ZIF-8 with a cobalt salt solution, and carrying out spray pyrolysis treatment to obtain a coating agent; mixing the coating agent, the lithium-rich manganese-based positive electrode material and a solvent, grinding and calcining to obtain a coated lithium-rich manganese-based positive electrode material; and mixing the coated lithium-rich manganese-based positive electrode material with a PEDOT: PSS solution, evaporating a solvent, and calcining to obtain the composite modified lithium-rich manganese-based positive electrode material. The composite coating layer is arranged on the surface of the lithium-rich manganese-based positive electrode material, so that the surface structure of the material is stabilized, the problems of poor electrode surface conductivity and more interface side reactions are solved, and the circulation and rate performance of the material is obviously improved.

This invention provides a silicon wafer, its preparation method, and its applications. The silicon wafer of this invention includes a boron-containing layer and a phosphorus-containing layer. The boron-containing layer extends from the outer surface of the silicon wafer to its center, and the spatial distribution of the boron-containing layer and the phosphorus-containing layer within the silicon wafer does not overlap. In the boron-containing layer, the concentration of boron gradually decreases from the outer surface of the silicon wafer to its center. In the phosphorus-containing layer, phosphorus is uniformly distributed. The silicon wafer of this invention can possess both excellent surface conductivity and a long bulk minority carrier lifetime.