15results about How to "Improve polarization" patented technology

The invention relates to a negative pole piece, a battery and electric equipment. The negative electrode piece comprises a negative electrode current collector layer and a negative electrode material layer, the negative electrode current collector layer and the negative electrode material layer are arranged in a stacked mode, the negative electrode material layer comprises liquid absorption particles, each liquid absorption particle comprises a liquid absorption core layer and a shell, the shell wraps the periphery of the liquid absorption core layer, the shell is a polymer shell layer, and the liquid absorption core layer and the shell are arranged in a staggered mode. And the melting temperature T of the shell is more than or equal to 100 DEG C and less than or equal to 150 DEG C.

The invention relates to the field of battery materials, in particular to a positive plate and a lithium ion secondary battery, the positive plate comprises a current collector, a bottom coating layer located on at least one side of the current collector and a positive electrode active material layer located on one side, away from the current collector, of the bottom coating layer, the bottom coating layer comprises metal oxide, and the positive electrode active material layer comprises metal oxide. The total mass of the metal oxide is 100%, the metal oxide comprises 50%-70% of titanium dioxide, 25%-40% of tin oxide and more than 0 and less than or equal to 25% of antimony oxide, and the titanium dioxide, the tin oxide and the antimony oxide in the bottom coating are expanded, shrunk and the like when the battery is overcharged; the bottom coating is separated from the current collector, so that the positive plate is not electrically connected, the voltage of the battery is rapidly increased to the overcharge cut-off voltage, the structure of the positive active material is stable, the battery can be effectively prevented from overcharge failure, the safety of the battery is improved, overcharge protection is realized, and meanwhile, the normal cycle performance of the battery is not influenced.

The preparation method comprises the following specific steps: firstly, loading carbon nanoparticles and SiO2 nanoparticles on the surface of BNNS to obtain 1-BNNS / C / SiO2, then preparing a porous hollow SiO2 coated BNNS / C composite material (2-BNNS / C / SiO2), and mixing double-structure BNNS / C / SiO2 as a polyurethane filler to obtain the wave-absorbing and heat-conducting super-hydrophobic anticorrosive coating. The coating consists of a polyurethane matrix and two BNNS / C / SiO2 composite materials with different structures, and the structure of the 1-BNNS / C / SiO2 composite material is as follows: carbon nanoparticles are uniformly loaded on the surface of BNNS, and then SiO2 microspheres are uniformly grown on the surface of the BNNS; the structure of the 2-BNNS / C / SiO2 composite material is as follows: BNNS uniformly loaded with carbon nanoparticles is wrapped by porous and mesoporous SiO2 microspheres. According to the prepared wave-absorbing and heat-conducting type super-hydrophobic anticorrosive coating, the tight attachment of the carbon nanoparticles and the SiO2 nanoparticles on the surface of the BNNS is fully utilized, and an efficient conductive network and a heat conduction path are constructed. And the BNNS and the porous SiO2 microspheres can optimize impedance and enhance wave absorption.

The invention relates to the technical field of lithium batteries, and particularly discloses a silicon-carbon negative electrode active material based on a fluidized bed method and a preparation method thereof. Comprising silicon carbon and a Mo < x > O < y > P < z > layer; the Mo < x > O < y > P < z > layer coats the silicon carbon; wherein 0 < x < 1, 0 < y < 1.6, and 0 < z < 1. The silicon-carbon negative electrode active material prepared by the invention has excellent cycling stability and rate capability, and the MoxOyPz with excellent structural stability is uniformly coated on the silicon-carbon surface, so that direct contact between sulfide solid electrolyte and a silicon-carbon negative electrode can be effectively prevented, generation of high-resistance substances is inhibited, and increase of battery polarization and deterioration of rate are avoided; li < + > can be received in the first lithiation process to form a rapid transmission channel, and Li < + > transmission is accelerated; due to the excellent structural stability of MoxOyPz, the MoxOyPz can bear volume expansion and shrinkage in the silicon-carbon lithiation lithium removal process, so that the material and the electrode keep complete and stable in structure.

A bipolar plate suitable for a trapezoidal liquid flow battery or a battery stack, the bipolar plate is a trapezoidal flat plate structure, and an isosceles trapezoidal area for contacting an electrode is provided in the middle of one side surface or two side surfaces of the plate; the electrolyte flows into the electrode area from the lower bottom side of the trapezoidal electrode area and then flows out from the upper bottom side of the trapezoidal area, the lower bottom side of the trapezoidal area flowing in is called the inlet side side of the electrode area, and the upper bottom side of the trapezoidal area flowing out is called the outlet side side of the electrode area; two groups of groove groups consisting of one or more quadrilateral grooves are respectively provided on the left and right waists of the trapezoidal electrode area toward the middle of the electrode area, which are called guide grooves, one of the two groove groups is arranged near the inlet side, and the other is arranged near the outlet side. By causing the electrolyte to flow directly from the middle of the inlet cross section to the vicinity of the outlet wall, the concentration of active substances in the outlet attachment is increased, thereby effectively reducing the concentration gradient of reactive active substances in the inlet and outlet directions and reducing polarization.

The present application relates to a positive electrode material and a preparation method thereof, and a battery. The positive electrode material is a nickel cobalt lithium composite oxide. The positive electrode material is measured by XRD to obtain a characteristic peak I(104) corresponding to the (104) crystal plane of the positive electrode material. The characteristic peak I(104) is separated to obtain two diffraction peaks. The separation degree α of the two diffraction peaks satisfies: 0.7≤α≤2.0. The technical solution provided by the present application can improve the particle strength of the positive electrode material and reduce the polarization phenomenon of the positive electrode material, so that the positive electrode material has both excellent cycle stability and rate performance.

The present invention discloses a wafer fusion integrated multi-junction long wavelength surface emitting laser and a manufacturing method, including: a surface emitting laser VCSEL structure and a modulator EOM structure; the surface emitting laser VCSEL structure includes a GaAs base substrate, a GaAs buffer layer, a first N-type doped DBR, a resonant cavity, a buried tunnel junction, a fill layer, and a P-type doped DBR from bottom to top; the modulator EOM structure includes a P-type doped DBR, a first waveguide layer, an absorption layer, a second waveguide layer, and a second N-type doped DBR from bottom to top; the surface emitting laser VCSEL structure and the modulator EOM structure share a P-type doped DBR. The present invention can significantly improve the heat dissipation problem, reduce the divergence angle of the emitted light, and improve the output beam quality.

The present invention provides a method for preparing a positive electrode material for a lithium ion battery, comprising the following steps: 0.6 Mn 0.4 The (OH)2 precursor is mixed with lithium carbonate and then ground and sintered to obtain LiNi 0.6 Mn 0.4 O2; using anhydrous ethanol as solvent, polyvinyl pyrrolidone, prepared LiNi 0.6 Mn 0.4 O2 and cobalt nitrate are mixed and stirred until the ethanol evaporates naturally; the mixed material is sintered at 500℃~600℃ for 3~7h to obtain surface-modified LiNi 0.6 Mn 0.4 O2, and the lithium-ion battery positive electrode material is obtained. The present invention adopts a relatively simple preparation method to prepare the low-cost cobalt-free positive electrode material LiNi 0.6 Mn 0.4 O2 is used for surface modification to produce positive electrode materials with high capacity and good cycle performance. The electrochemical performance of the obtained materials is greatly improved and has great practical value.

This invention provides a cathode material, its preparation method, and a lithium-ion battery. The preparation method includes: (1) mixing an organic ligand, a magnesium source, and a solvent, and reacting to obtain a magnesium-based MOF; wherein the molar ratio of the organic ligand to the magnesium source is (1.8-2.3):1; (2) mixing carbon-coated lithium vanadium oxyphosphate, a solvent, and the magnesium-based MOF, and sintering to obtain the cathode material. In the preparation method of this invention, a carbon layer and a magnesium-based MOF layer are sequentially coated on the surface of lithium vanadium oxyphosphate, which can effectively reduce the contact between the cathode material and the electrolyte, suppress its side reactions with the electrolyte, and improve the cycle stability of the material; and can improve the surface porosity, ionic conductivity, electronic conductivity, and Li-ion battery of the material. + The insertion and extraction speed is increased, thereby improving the polarization phenomenon at high magnification and effectively enhancing the rate performance of the material.

The invention relates to the technical field of lithium batteries, and particularly discloses a graphite negative electrode active material based on a fluidized bed method and a preparation method thereof. Comprising graphite and a MoxOyPz layer, the graphite is coated with a Mo < x > O < y > P < z > layer; wherein x is more than 0.50 and less than 0.95, y is more than 0.15 and less than 1.45, and z is more than 0.35 and less than 0.98. The prepared graphite negative electrode active material has excellent cycling stability and rate capability, the surface of graphite is uniformly coated with a layer of substance containing molybdenum and phosphorus based on a fluidized bed, MoxOyPz with excellent structural stability is obtained through high-temperature calcination, the surface of the graphite is uniformly coated with the MoxOyPz, and the performance of the graphite negative electrode active material is improved. The direct contact between the sulfide solid electrolyte and the graphite cathode can be effectively prevented, the generation of high-resistance substances is inhibited, and the increase of the polarization of the battery and the deterioration of the multiplying power are avoided; and moreover, Li < + > can be received in the first lithiation process to form a rapid transmission channel, and Li < + > transmission is accelerated.

The present application provides a polarizing film, which has transparent protective films attached to both sides of a polarizing film, the polarizing film being formed by adsorbing iodine to a polyvinyl alcohol-based film and orienting it, and having an iodine concentration of 6% by weight or more, and the moisture permeability of at least one of the transparent protective films being 200 g / (m 2 24h) or less, the polarizing film satisfying the condition that the change amount (ΔTs) of the monomer transmittance represented by the general formula (1): ΔTs(%) = Ts 750 Ts0 is 0% or more and 5% or less. The initial degree of polarization of this polarizing film is good, and the effects of suppressing the decrease in monomer transmittance due to the coloring of the polarizing film in a high-temperature environment are also excellent, and furthermore, the effects of suppressing the decrease in the degree of polarization in a high-temperature high-humidity environment (moisture resistance) are excellent.

The present application provides a polarizing film, which is formed by adsorbing iodine to a polyvinyl alcohol-based film and orienting it, has an iodine concentration of 3% by weight or more and 10% by weight or less, and in a produced gas analysis method, the peak temperature of the maximum intensity of water detected in the presence of an inert gas at a temperature increase rate of 10°C / min and a temperature increase range of 40°C to 350°C is 205°C or higher. The polarizing film has a good initial degree of polarization, and is also excellent in the effect of suppressing a decrease in monomer transmittance caused by coloring of the polarizing film in a high-temperature environment.

The invention discloses a digital signage with a screen moistening function and a screen moistening method thereof, the digital signage comprises a display panel and a controller, the display panel is configured to display content, and the controller is configured to perform screen moistening processing on the display panel based on a configured screen moistening trigger condition. The screen moistening processing is to play the set screen moistening display content on the display panel in a rolling manner for a specified duration. Starting and stopping of the screen moistening program are accurately controlled, it is ensured that the screen moistening program is automatically started in the non-high-frequency use time period of a client or when the screen is in a low load state, and therefore normal use of the client is prevented from being disturbed. According to the screen moistening method, pixel refreshing is carried out by displaying well-designed dynamic images, and the images cover different colors, brightness and animation effects. The refreshing strategy of the dynamic image aims at uniformly dispersing the pixel load and effectively reducing the liquid crystal molecule polarization risk caused by long-time display of the static image.

The invention relates to a method for preparing ceramic material of ceramic electrode for tumor treating fields, which comprises the following steps of synthesizing a[0.67Bi0.995Ce0.005FeO3-0.33BaTiO3]-b[Sr1-xPbxTi1-yZryO3]-c[Pb(Mg1 / 3Nb2 / 3)O3] powder by a solid phase method; Where 0<a<0.06, 0.05<b<0.18, a+b+c = 1; 0.6≤x≤0.8, 0<y<0.2; Fine grinding the powder, adding a binder, granulating, and pressing for forming to obtain a biscuit; Removing organic substances in the biscuit; Sinter that biscuit to obtain the ceramic material. The invention also provides a ceramic material prepared by the preparation method, which has the characteristics of high dielectric constant and low loss and is suitable for manufacturing a ceramic capacitor electrode for conducting an electric field but blocking conducting current.

This application provides an electrochemical device, an electrical device, and a charging device. The electrochemical device includes an electrode assembly and a charging circuit configured to receive a charge current and charge the electrochemical device. The first electrode plate includes a first current collector, a first active material layer disposed on a surface of the first current collector, and X first tabs, where X is an integer greater than 1, and the X first tabs and the first current collector are integrally formed. The second electrode plate includes a second current collector, a second active material layer disposed on a surface of the second current collector, and Y second tabs electrically connected to the second current collector, where Y is an integer greater than or equal to 1, and Y < X. The electrochemical device, the electrical device, and the charging device according to this application can avoid the loss of active materials, and avoid a series of problems caused by uneven thinning. In addition, compared with a multi-tab winding structure, the electrochemical device can keep the capacity and energy density from losing. Moreover, coupled with a pulse charging manner, the structure disclosed herein significantly improves the charging capabilities of the electrochemical device under low-temperature conditions.