22results about How to "Shorten the migration path" patented technology

The invention discloses an improved efficient turbulent flow microbubble flotation device for feeding and discharging materials. Comprising an outer cylinder, an inner cylinder arranged in the outer cylinder, a stirring mechanism arranged in the outer cylinder, a feeding mechanism used for conveying raw materials into the inner cylinder, a concentrate tank located on the upper portion of the outer cylinder, a countercurrent mineralization mechanism arranged in the inner cylinder and a tailing separation mechanism connected to the bottom of the inner cylinder. Through cooperation of the sawtooth disc self-suction dispersion impeller and the false bottom structure, local area circulation can be formed, the elution effect on the surfaces of coarse particles can be enhanced, meanwhile, dispersion of heterogeneous fine silt is facilitated, and the purity of tailings is further ensured; according to the method, the flotation efficiency can be improved, and the energy consumption is greatly reduced; due to the design of the sawtooth disc self-suction dispersion impeller, gas is allowed to enter in a self-suction mode, and energy consumption of traditional air compression equipment is avoided. According to the sawtooth disc self-suction dispersion impeller, suction force brought by the vacuum effect generated by rotation of the impeller can be improved, and suction of more air is promoted.

The invention discloses a high-conductivity manganese iron phosphate precursor, lithium manganese iron phosphate and a preparation method, and belongs to the technical field of lithium ion battery materials. The preparation method of the ferromanganese phosphate precursor comprises the following steps: adding a manganese source, an iron source and a phosphorus source into a nitric acid solution, then adding nano silicon dioxide, and stirring and carrying out a constant-temperature hydrothermal reaction to obtain an intermediate; adding the intermediate into an HF solution for soaking to obtain a ferromanganese phosphate precursor; the lithium manganese iron phosphate prepared by adopting the manganese iron phosphate precursor, glucosylated carbon nanotubes and a lithium source through wet ball milling and calcination is good in specific capacity and rate capability and high in conductivity.

The invention provides a graphite negative electrode plate, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: S1, mixing materials; step S2, coating is carried out; the coated electrode plate is subjected to N sets of magnetization treatment periodically, a graphite negative electrode plate is obtained, and N is an integer larger than or equal to 1; each group of magnetization treatment comprises first magnetization carried out along a first direction, second magnetization carried out along a second direction and third magnetization carried out along a third direction, the first magnetization, the second magnetization and the third magnetization are carried out in any sequence, the first direction is perpendicular to the plane direction of the coated electrode slice, the second direction is perpendicular to the third direction, and the third direction is perpendicular to the plane direction of the coated electrode slice. And the direction is parallel to the plane direction of the coated electrode plate. According to the invention, the coated pole piece coated with the graphite active material slurry is magnetized for three times to obtain the oriented graphite negative pole piece, so that the migration path of lithium ions in the de-intercalation process is shortened, and high charge-discharge rate and excellent cycle performance are obtained.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a silicon-carbon negative electrode material, a preparation method thereof, a negative electrode plate and a lithium ion battery. The silicon-carbon negative electrode material comprises a composite fiber, wherein the composite fiber comprises a core layer and a carbon coating layer; the core layer has a pore structure and comprises a carbon skeleton and a silicon material; in the cross section of the composite fiber, the area of the pore structure is S pore, the area of the silicon element is S silicon, the area of the carbon element is S carbon, and 0.5 < = S pore / (S silicon + S carbon) < = 2. The silicon material in the core layer can provide higher gram volume, and the carbon skeleton can provide mechanical strength and enhance the conductivity of the material; the core layer has a pore structure and can provide a buffer space when the silicon material is charged, so that the cycle performance is improved; the carbon coating layer can effectively reduce the specific surface area of the material, avoids direct contact between the silicon material and an electrolyte, and improves the initial coulombic efficiency; the silicon material can be ensured to have enough buffer space by meeting the relational expression, and the cycle performance can be further improved.

The invention discloses a low-moisture and high-safety lithium battery diaphragm and a preparation method thereof.The low-moisture and high-safety lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified gamma-phase superfine porous aluminum oxide, the modified gamma-phase superfine porous aluminum oxide is obtained by modifying gamma-phase superfine porous aluminum oxide through a silane coupling agent, and the modified gamma-phase superfine porous aluminum oxide is prepared from modified gamma-phase superfine porous aluminum oxide. The silane coupling agent is one of a vinyl silane coupling agent and a methyl silane coupling agent. According to the invention, surface modification is carried out on gamma-phase superfine porous alumina by using a silane coupling agent with a hydrophobic group, so that the diaphragm has high ionic conductivity, good high temperature resistance and good liquid absorption and retention capability, and meanwhile, the water content of the diaphragm is reduced.

The invention belongs to the technical field of lithium ion batteries, and relates to a high-load positive pole piece, a preparation method and a high-specific-energy battery. The positive pole piece is an electrode of a double-layer structure and comprises a current collector, a first electrode layer and a second electrode layer, wherein the first electrode layer and the second electrode layer are far away from the current collector. The specific gravity of the active substance small-particle single crystal ternary material of the first electrode layer is smaller than that of the large-particle polycrystalline ternary material, and the specific gravity of the active substance small-particle single crystal ternary material of the second electrode layer is larger than that of the large-particle polycrystalline ternary material. According to the dual-structure electrode plate, Li < + > migration paths are distributed in a tortuous gradient mode, large and small particles have a synergistic effect, a rapid electrolyte diffusion channel and a rapid lithium ion diffusion channel are achieved, the first electrode layer serves as a rapid transmission layer, the second electrode layer serves as a reaction balance layer, the concentration polarization problem in a thick electrode is effectively solved, the positive electrode capacity can be brought into play, and the service life of the electrode plate is prolonged. The battery energy density is improved. Meanwhile, the prepared positive electrode slurry is heated, high solid content is achieved, the use amount of a solvent is reduced, cracking of a high-load pole piece during coating is prevented, simultaneous coating and integrated preparation of the first electrode layer and the second electrode layer are achieved through the double-layer coating die head, and the interface internal resistance is reduced.

The invention discloses a negative plate and a preparation method thereof, and a lithium ion battery. The negative plate comprises a current collector; the first negative electrode active layer is arranged on at least one surface of the current collector; the polymer layer comprises a plurality of polymer bosses, the plurality of polymer bosses are arranged on the surface, back to the current collector, of the first negative electrode active layer at intervals, and the polymer bosses are made of polymers capable of being dissolved in the electrolyte; the second negative electrode active layer comprises a plurality of negative electrode active bosses, the plurality of negative electrode active bosses are arranged on the surface, back to the current collector, of the first negative electrode active layer at intervals, and each negative electrode active boss is arranged between two adjacent polymer bosses; wherein the polymer bosses are dissolved in the electrolyte, so that a groove is formed between every two adjacent negative active bosses. The polymer layer is introduced into the negative plate, and the safety, the ionic conductivity and the high-rate charging performance of the battery can be improved by utilizing the characteristic that the polymer layer can be dissolved in electrolyte.

The present invention belongs to the technical field of lithium ion batteries, and discloses a ligand-coated doped lithium iron phosphate and a preparation method and application thereof. The general formula of the ligand-coated doped lithium iron phosphate is LiFePO4@Mn-T-C / N; T is at least one of zinc, nickel, copper, iron, cobalt, zirconium, aluminum, gallium, and chromium. The doped type in the ligand-coated doped lithium iron phosphate of the present invention is doped by a composite-loaded micro-carbon sphere conductor, and the particle size of the composite-loaded micro-carbon sphere conductor reaches 80-150nm level, so it can withstand greater stress and reduce the probability of rupture. The spherical lithium iron phosphate doped with the composite-loaded micro-carbon sphere conductor has a more easily controlled material structure integrity.

The invention relates to the field of battery materials, in particular to a lithium ion battery which comprises a positive pole piece, a negative pole piece, electrolyte and a diaphragm located between the positive pole piece and the negative pole piece, the electrolyte comprises boron-containing lithium salt, based on the total mass of the electrolyte, the mass percentage of the boron-containing lithium salt is 2wt%-10wt%, and the mass percentage of the diaphragm is 10wt%-10wt%. The diaphragm comprises a base film and a gluing layer located on at least one surface of the base film, and the coverage rate of the gluing layer is 5-70%. The boron-containing lithium salt has a relatively large anion volume, so that surface charges of anions can be delocalized, dissociation of the lithium salt is facilitated, and the conductivity of the electrolyte and the transference number of lithium ions are improved. Meanwhile, a large number of fluorine elements in the boron-containing lithium salt can stabilize the lithium supplement agent material and reduce the oxidation of the electrolyte. The gluing layer can improve the bonding force between the diaphragm and the positive pole piece, shorten the migration path of lithium ions and shorten the migration time of the lithium ions; meanwhile, the gluing layer can weaken diffusion of large-volume anions.

This invention relates to a method for preparing a vanadium selenide / vanadium oxide heterojunction photo-assisted zinc-ion battery, belonging to the technical field of vanadium selenide / vanadium oxide heterojunction photo-assisted electrochemical energy storage and zinc-ion battery. The method includes the following steps: mixing a selenium source solution and a vanadium source solution to obtain a reaction precursor solution; subjecting the reaction precursor solution to a hydrothermal reaction and washing to obtain vanadium selenide material; annealing the vanadium selenide material to form a vanadium oxide layer on its surface, obtaining a vanadium selenide / vanadium oxide heterojunction composite material; mixing the vanadium selenide / vanadium oxide heterojunction composite material, a conductive agent, and a binder, adding a solvent to prepare a slurry, coating the slurry onto the surface of a current collector, and drying to obtain a photocathode. The material and its application system described in this invention exhibit good specific capacity, rate performance, and cycle stability, and demonstrate good energy storage performance under illumination conditions; this invention is beneficial for further reducing electrode polarization and promoting the synergistic enhancement of electron transport and zinc-ion storage.

This invention discloses a method for extracting fish oil from tuna by-products, a partitioned supercritical fluid extraction (SCFE) device, and the resulting fish oil. The method includes: washing and crushing the by-products into 0.5-5 mm pieces; drying them at 30-40°C under a nitrogen-fluidized atmosphere with an oxygen content below 50 ppm until the moisture content is below 5%; and then processing them using a partitioned supercritical fluid extraction (SCFE) device at 35-40°C and 40-80 MPa. The device is divided into an extraction section and a separation section from bottom to top. The first to fifth layers are extraction trays, and the sixth to Nth layers are separation trays, where N is 12-30. The solid feed inlet is located between the two sections. Supercritical CO2 rises from the bottom of the column. The material descends layer by layer through the extraction section and is discharged from the bottom. Oil-rich CO2 rises, undergoes pre-separation in the separation section, and is then subjected to two-stage pressure reduction separation and filtration to obtain fish oil. This invention allows for continuous and stable operation under high pressure, with uniform mass transfer, resulting in fish oil with low oxidation and high quality.

The present application discloses a supported bimetallic-based two-dimensional nanocatalytic material, a preparation method thereof, and an application thereof, which relate to the technical field of catalysts. The preparation method includes: preparing a plasma nanosheet with a single-layer structure or a few-layer structure; dispersing the plasma nanosheet in a solvent and adding a copper source to prepare a first mixed solution; subjecting the first mixed solution to stirring treatment in an inert gas environment, and successively performing freeze-drying treatment and calcination treatment in a hydrogen atmosphere to prepare a nanosheet-Cu; successively adding HAuCl4 and HCl to the nanosheet-Cu, mixing and reacting under a preset light condition to prepare a supported bimetallic-based two-dimensional nanocatalytic material, namely, a nanosheet-Cu-Au. The present application can achieve the functional division and spatial synergy of bimetallic active sites, and promote the efficient generation, separation, and directional transport of photo-generated carriers, thereby improving the reaction efficiency and product selectivity of the co-reduction of nitrate and carbon dioxide to urea.

The utility model relates to a kind of LED chip structure for improving device performance, recess that is through second semiconductor layer and active layer, and extend to the inside of first semiconductor layer;With the ohmic contact of second semiconductor layer, the first conductive layer is covered in the part surface of second semiconductor layer and forms regular recess on the surface of first conductive layer first insulating layer;Covered in the part surface of first insulating layer and filled in the recess formed by first insulating layer, and the first reflective layer is electrically connected with first conductive layer;Covered in the part surface of first insulating layer and forms electrically connected with first reflective layer second conductive layer, covered in the sidewall of recess and the second insulating layer of first electric connection layer side, covered in the part surface of second insulating layer and filled in recess second reflective layer, second reflective layer forms ohmic contact with first semiconductor layer.The utility model improves external quantum efficiency, i.e. Lower forward voltage, improve chip brightness;Reduce thermal effect, prevent metal migration to cause failure.

The utility model discloses a kind of cleaning equipment with efficient cleaning air-drying function, including machine body, cleaning mechanism and air-drying mechanism, the front and rear ends of machine body advancing direction are respectively correspondingly provided with horizontal installation part and vertical installation part;The brush disc bottom of cleaning mechanism has several roller brush heads for cleaning carpet, brush disc is set below the horizontal installation part;Air-drying mechanism has mounting seat and air-drying scraper brush, mounting seat is adjustably set below vertical installation part, air-drying scraper brush is set in the lower part of mounting seat and with roller brush head at same cleaning horizontal plane, so that several roller brush heads of brush disc are supplied with clean water by clean water tank and clean carpet along cleaning direction, air-drying scraper brush immediately after it to complete roller brush carpet and carry out air-drying treatment and sewage recovery to sewage tank to the carpet.The optimization of cleaning mechanism, air-drying mechanism on machine body makes the whole machine structure more compact and lower cost, and improves the cleaning work efficiency of equipment to carpet.

The application discloses a TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst and a preparation method and application thereof, and relates to the field of photocatalytic materials. The TiO2-ZnIn2S4 core-shell structure S-type heterojunction photocatalyst comprises a TiO2 inner core, and a ZnIn2S4 outer shell coated outside the TiO2 inner core; the ZnIn2S4 outer shell is formed by in-situ growth of ZnIn2S4 nanosheets on the surface of the TiO2 inner core to form a three-dimensional hierarchical nanoflower structure; wherein, an S-type heterojunction is formed between the TiO2 and the ZnIn2S4. The photocatalyst realizes efficient spatial separation of photo-generated carriers through a close heterojunction interface of the core-shell structure, and meanwhile, the S-type heterojunction retains the carriers with strong oxidation-reduction capacity, so that the performance of water decomposition for hydrogen production by photocatalysis and the cycle stability are improved.

The invention discloses a sodium vanadium fluorophosphate-based sodium ion battery positive electrode material and a preparation method thereof, and relates to the technical field of battery materials. The preparation method of the sodium vanadium fluorophosphate-based sodium ion battery positive electrode material of the invention comprises the following steps: adding a carbon source, a vanadium source, a phosphorus source, a fluorine source, a sodium source, and deionized water into a reactor and stirring to obtain a gel A; heating the gel A to remove water, vacuum drying, and grinding to obtain a precursor; pre-sintering the precursor in an inert gas atmosphere, secondary sintering, and furnace cooling to obtain the sodium vanadium fluorophosphate-based sodium ion battery positive electrode material. The invention is simple to operate and has good reproducibility. The prepared material has a high energy density and excellent rate and cycle performance, and can meet the needs of practical applications of sodium ion batteries.

This invention discloses a chemically resistant insulating paper, relating to the field of insulating materials technology. The chemically resistant insulating paper includes an outer layer, with an inner intermediate layer; the intermediate layer is bonded to the inner layer. This invention, combining a multi-layered composite structure with a unique fiber interweaving and porous structure, effectively blocks the penetration of chemical substances. The outer PTFE coating provides the first line of protection, the dense structure and chemically stable materials of the intermediate layer further block the penetration, and the modified fibers of the inner layer also possess a certain degree of corrosion resistance. Testing showed that after immersion in a 10% hydrochloric acid solution for 1000 hours, the insulating paper's performance did not significantly decrease. Each layer of material itself possesses excellent insulation properties, and the structural design optimizes the internal electric field distribution. The aramid fiber and nano-silica composite structure of the intermediate layer, and the modified cellulose and PPS fiber interweaving structure of the inner layer, reduce electron migration paths and improve insulation resistance, reaching over 10^15 Ω·cm.

The invention relates to the technical field of MOS (Metal Oxide Semiconductor) semiconductors, and discloses a voltage-withstanding MOSFET (Metal Oxide Semiconductor Field Effect Transistor) device for high-load shutdown of a robot dog and a preparation method thereof, the voltage-withstanding MOSFET device comprises a plurality of parallel MOS cells, and each MOS cell comprises a drain electrode, a semiconductor epitaxial layer, a source electrode and a grid electrode; the semiconductor epitaxial layer comprises an N substrate layer, an N drift layer, a P + layer, an N well layer and a P well layer, and a lightly doped N layer is arranged in the middle of the N drift layer of each MOS cell; laterally symmetrical L-type P-layers with inclined tops and arc-shaped opposite side tops are introduced to the two sides of an N drift layer, and in cooperation with the middle buffering effect of a lightly doped N layer, local electric field concentration at the edge of the N drift layer in a traditional device can be accurately dispersed; the arc-shaped and L-shaped contours defined by the photoetching process can effectively guide the electric field to be uniformly distributed, so that the breakdown risk caused by too strong local electric field is avoided.

The utility model discloses an electrochromic mobile phone back cover, including first substrate layer, first electrode layer, electrochromic layer, electrolyte layer, ion storage layer, second electrode layer and second substrate layer that set gradually in layers, at least one in electrochromic layer and ion storage layer is equipped with grid shape protuberant microstructure on the side surface of electrolyte layer, grid shape protuberant microstructure is embedded to electrolyte layer. This electrochromic mobile phone back cover has lower energy consumption, faster color change response speed and deeper color change effect.

The present invention relates to a positive electrode material and a preparation method and application thereof. The positive electrode material of the present invention comprises a sodium vanadium phosphate composite carbon nanofiber material and a conductive mesogen coating layer coated on the surface of the sodium vanadium phosphate composite carbon nanofiber material. 2 Ox mesomorphous material coated with carbon composite sodium vanadium phosphate nanofiber material M 2 O x @NVP / C stabilizes the sodium vanadium phosphate during the charge and discharge process on the basis of enhancing the ionic conductivity and electronic conductivity of sodium vanadium phosphate, thereby improving the rate charge and discharge performance and cycle stability of the positive electrode material.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a multi-layer structure negative pole piece, a preparation method thereof and a lithium ion battery, the multi-layer structure negative pole piece comprises a negative current collector, and a first active layer, a composite layer and a second active layer which are sequentially laminated on one side of the negative current collector; the composite layer comprises a dissolvable polymer material layer obtained by a multi-stripe coating method and a third active layer for filling gaps of the dissolvable polymer material layer; by utilizing the physical intersolubility between the organic solvent and the polymer slurry in the electrolyte, when the negative pole piece is made into a finished battery, a plurality of grooves are dissolved in the coating layer of the negative pole piece, an ion channel is constructed to accelerate the ion transmission performance, the procedure of constructing the grooves before the pole piece is assembled is omitted, and the production period is shortened; no negative electrode powder is left in the prepared lithium ion battery, the polymer material is dissolved in the electrolyte to form a stable solution, adverse effects on the working performance of the battery are avoided, and potential safety hazards are reduced.

The invention relates to the technical field of battery positive electrode materials, in particular to a double-ion-doped phosphate sodium battery positive electrode material, a preparation method and a sodium ion battery. The method comprises the following steps: taking a sodium source, a manganese source, a magnesium source, a chromium source, a zirconium source and a phosphorus source according to a stoichiometric ratio of (3.8-4.2): (0.7-0.95): (0.05-0.3): (0.7-0.95): (0.05-0.3): 1; the metal manganese chromium source accounts for 1.0-8.0% of the total mass of the metal manganese chromium source and is used as an organic chelating agent; the method comprises the following steps: mixing a metal manganese-chromium source and a chelating agent in a solvent, and dissolving to prepare a solution A; s3, mixing a phosphorus source, a sodium source, a magnesium source and a zirconium source in a solvent, dissolving to obtain a solution B, mixing the solution B with the solution A, and performing high-temperature spray drying to obtain a solid-phase precursor material; and S4, sintering and crushing the precursor material to obtain the dual-ion doped phosphate sodium battery positive electrode material. According to the method disclosed by the invention, the migration rate of sodium ions is optimized, and the rate capability of the material is improved.