90results about How to "Reduce migration resistance" patented technology

The invention relates to a solid electrolyte capable of lowering interface resistance on a metal lithium electrode, and a preparation method for the solid electrolyte. The preparation method comprises the steps of mixing lithium carbonate, lanthanum oxide and zirconium oxide, and uniformly grinding the mixture by a dry grinding method; then sintering the mixture in a muffle furnace, and grinding to obtain mother powder, and tabletting the mother powder; putting the tablet-shaped material into a crucible with a cover; then performing mother powder filling and sintering in the muffle furnace to obtain the compact ceramic sheet; and polishing the ceramic sheet until the surface of the ceramic sheet is smooth to obtain the solid electrolyte. Compared with the prior art, the electrolyte prepared by the method has the advantages of absence of impure phase on the surface, high relative density, low interface resistance on the metal lithium electrode, and the like.

The invention discloses a lithium manganese nickel oxide cathode material having nickel manganese concentration gradient and a preparation method thereof. The average chemical composition of the lithium manganese nickel oxide cathode material can be shown as a molecular formula of LiNi<0.5-x>Mn<1.5+x>O<4>, wherein x is more than or equal to 0.1 and less than or equal to 0.35, the concentration of Ni is gradually reduced in a gradient distribution manner from the particle center to the particle surface of the lithium manganese nickel oxide cathode material, and the concentration of Mn is gradually reduced in a gradient distribution manner from the particle center to the particle surface of the lithium manganese nickel oxide cathode material. The preparation method comprises the following steps of firstly, synthesizing a spherical-like particle having a core-shell structure by a co-precipitation process; and finally, preparing the lithium manganese nickel oxide cathode material with change on the nickel and manganese concentration by element diffusion during the high-temperature roasting process. The cathode material disclosed by the invention has excellent high-temperature cycle stability and rate performance, high reversible capacity, high chemical stability, long cycle life, and excellent comprehensive electrochemical performance.

The invention belongs to the technical field of battery material preparation, and specifically relates to a flame-retardant electrolyte of a lithium ion battery and a preparation method of the electrolyte. The flame-retardant electrolyte consists of a solvent, an accessory solvent, a film forming agent, a cosolvent, flame retardant and lithium salt; the preparation method comprises the steps of performing mixing on ethylene carbonate, diethyl carbonate and methyl ethyl carbonate in a glove box filled with argon to prepare a mixed solvent; next, adding the accessory solvent, the film forming agent, the cosolvent and the flame retardant into the mixed solvent to be mixed uniformly to obtain a mixed liquid; and finally, dissolving the lithium salt into the mixed liquid to obtain the flame-retardant electrolyte of the lithium ion battery. The obtained flame-retardant electrolyte has relatively high flame-retardant effect, so that the safety and reliability of the lithium ion battery can be effectively improved; meanwhile, the flame-retardant electrolyte has relatively high compatibility with a graphite carbon negative electrode; and furthermore, the lithium ion battery assembled by the flame-retardant electrolyte has high electrochemical performance.

The invention discloses sulfur-doped carbon nanowires, and a three-dimensional sulfur-doped carbon nanowire network-silicon composite material and a preparation method thereof. The invention discloses a preparation method of a sulfur-doped carbon nanowire lithium ion battery anode material. In the method, sulfur-containing polymer nanowires are prepared with a soft template method, and the sulfur-doped carbon nanowires are prepared through further carbonization. Through doping of carbon into sulfur, the first-time coulombic efficiency of the carbon nanowires serving as the lithium ion battery anode material is increased effectively. Moreover, silicon particles are added into a sulfur-containing polymer nanowire reaction system prepared with the soft template method in order to prepare a composite material in which carbon particles are embedded into a three-dimensional sulfur polymer nanowire network, and high-temperature carbonization is performed to obtain a three-dimensional sulfur-doped carbon nanowire network-silicon composite material. The composite anode material has the advantages of high specific capacity, high cyclic stability and the like, and a novel effective path is provided for the research and development of high-performance lithium ion battery anode materials.

The invention provides a low-temperature lithium iron phosphate battery, which comprises a positive plate, a negative plate, a diaphragm and electrolyte. The positive plate is prepared by coating a positive current collector with positive paste including a positive active material, positive conductive agents, a positive binder and a positive solvent. The positive active material is Ti3SiC2-modified carbon-coated lithium iron phosphate. The positive conductive agents are carbon nanotubes and graphene. The negative plate is prepared by coating a negative current collector with negative paste including negative active materials, negative conductive agents, a negative binder, a thickener and a negative solvent. The negative active materials are artificial graphite and mesophase carbon microspheres. The negative conductive agents are carbon nanotubes and graphene. The experimental results show that the discharge capacity of the battery in the invention at minus 20 DEG C is 2488mAh and is 88.13% of that at room temperature, and the discharge capacity of the battery at minus 40 DEG C is 2215mAh and is 78.46% of that at room temperature.

The invention discloses an efficient flame retardant siloxy fluoro-cyclotriphosphazene and a synthesis method thereof. Fluoro-cyclotriphosphazene is dissolved into an organic solvent, and a siloxy compound and a catalyst are added to perform a reaction for 0.5-72h to replace fluorine atoms by siloxy to obtain siloxy fluoro-cyclotriphosphazene, wherein the siloxy compound is potassium trimethylsilanolate, sodium trimethylsilanolate or lithium trimethylsilanolate. The adopted synthesis method is mild in reaction conditions, high in reaction controllability and capable of realizing industrial production conveniently; and in addition, the technological process is simple, the reactants and the solvent can be recycled, and the product purity and yield are relatively high.

The invention discloses a preparation method of an organic silicon pouring sealant for LED (light emitting diode) encapsulation, and belongs to the technical field of electronic pouring material preparation. Silicon micro powder, spherical aluminum oxide and the like are mixed and heated to prepare base materials; hydroxyl silicone oil, tetramethyl tetravinyl cyclotetrasiloxane and the like are mixed and heated to prepare tackifiers; then, the base materials, the tackifiers, platinum catalysts and the like are mixed and ground to prepare an ingredient A; then, the base materials, vinyl silicone oil, hydrogen-containing silicone oil and methylbutynol are used as raw materials; mixing grinding and dispersion are performed to prepare an ingredient B; the ingredient A and the ingredient B are uniformly mixed, are subjected to foam discharging and are then filled onto bonding base materials to be cured; the organic silicon pouring sealant for LED encapsulation can be obtained. The obtained organic silicon pouring sealant has good flowing performance and bonding performance; meanwhile, the pouring sealant has excellent heat conduction performance; wide application prospects are realized in the LED encapsulation field.

The invention relates to a potassium ion battery positive electrode active material, a preparation method thereof and application thereof. The preparation method comprises the following steps: stirring and dissolving a sodium source, a titanium source, a phosphorus source and a carbon source in water, adding zirconium oxide and ethanol, carrying out ball milling treatment to obtain slurry, carrying out spray drying treatment on the slurry to obtain a precursor, carrying out vacuum annealing treatment on the precursor, and carrying out air cooling to room temperature to obtain carbon-coated zirconium-doped NaTi2 (PO4) 3.Carbon-coated zirconium-doped NaTi2 (PO4) 3 prepared by a ball milling-spray drying method is used as a positive electrode material, flaky metal potassium is used as a negative electrode material, and a potassium ion solution is used as an electrolyte to assemble the total battery; the total battery is high in energy density, long in cycle life and excellent in rate capability, the electrode material synthesis method is low in cost and environmentally friendly, the electrolyte is safe, non-toxic, stable, pollution-free and low in price, and possibility is provided for practical application of the potassium ion battery in the aspect of power grid energy storage.

The invention discloses a high-energy-density long-service-life fast-charging lithium ion battery and a preparation method thereof, wherein the low temperature is -20 DEG C, the multiplying power of rapid charging is 1C and 2C respectively, the multiplying power of rapid discharging is 1C and 3C respectively, the lithium ion battery mainly consists of five parts, namely a positive electrode sheet,a negative electrode sheet, a ceramic diaphragm, an electrolytic solution and a battery shell, and is prepared by combining and laminating the positive electrode sheet, the ceramic diaphragm, the negative electrode sheet and the ceramic diaphragm, putting into the battery shell, injecting the electrolytic solution and carrying out opening formation, sealing and grading capacity. According to theinvention, through preferable materials of lithium nickel cobalt aluminate, a silicon-carbon composite material, a macromolecular plasticizer, a nano-microporous carbon-coated aluminum net, a nano-microporous copper net, a high-temperature insulating tape, a polymer adhesive, a ceramic diaphragm, an electrolytic solution, a battery shell and the like and a preferable process technology, the beneficial effects of the battery are completely achieved, and the battery is suitable for application in the fields of 3C, power, energy storage and the like.

The invention belongs to the technical field of carbon nanotube, and discloses a flame method modified carbon nanotube, and a preparation method and applications thereof. According to the preparationmethod, ethanol flame combustion is adopted for surface modification of carbon nanotube so as to obtain TCNTs with a relatively large pore diameter as a matrix; in the presence of a nickel salt catalyst, flame combustion time and temperature are controlled, and in-suit growth of nanometer scale short carbon nanotubes (FCNTs) on the internal wall and the external wall of the TCNTs with certain spatial constraint effect is realized, and carbon nanotube composite fractal structures with different modification effects are obtained; when the flame method modified carbon nanotube is taken as a lithium ion battery anode material, excellent lithium ion storage ratio capacity is achieved. Compared with chemical vapor deposition method in the prior art wherein expensive production equipment, enclosed production environment, and relatively temperature (higher than 650 DEG C) are needed, the preparation method possesses following advantages: only alcohol flame is needed, open production environment is enough for production, and treatment temperature is relatively low (as low as 450 DEG C); obvious competitiveness is achieved; and large scale product is more convenient to realize.

The invention provides a Cu2S-SiW12/MoS2 composite counter electrode and a preparation method thereof and a quantum dot solar sensitized cell, which belong to the technical field of solar cells. The Cu2S-SiW12/MoS2 composite counter electrode comprises a conductive substrate and a Cu2S layer and a SiW12/MoS2 composite layer attached successively to the conductive substrate. The Cu2S-SiW12/MoS2 composite counter electrode provided in the invention has excellent catalytic performance in a polysulfide electrolyte, and can effectively reduce the interface charge transfer impedance of the quantum dot sensitized solar cell.

The invention relates to the technical field of carbonate oil and gas field development, and provides a fracture network volumetric acid fracturing method of a carbonate reservoir. The fracture network volumetric acid fracturing method includes the following steps that a low-viscosity emulsion slippery water acid solution is injected into a carbonate oil and gas field well, and migration resistance of the low-viscosity emulsion slippery water acid solution near the wellbore area is lowered; the low-viscosity emulsion slippery water acid solution is injected into the carbonate oil and gas fieldwell, and fracture network volumetric acid fracturing modification is conducted on a dominant fracture channel near the perforation section; vegetable glue liquid is pumped into the carbonate oil andgas field well, and the steering process of low-viscosity emulsion slippery water acid solution is completed; the low-viscosity emulsion slippery water acid solution is continuously pumped into the carbonate oil and gas field well, and the fracture network volumetric acid fracturing modification process is completed; and displacement fluid is injected into the carbonate oil and gas field well, and the oil and gas production is tested. According to the fracture network volumetric acid fracturing method of the carbonate reservoir, the low-viscosity emulsion slippery water acid solution can lower the migration resistance of acid liquor in fractures near the well to the distance, and a long and complex fracture system is formed advantageously; and meanwhile, the vegetable glue liquid has thehigh steering ability and glue is prone to being broken by oxygen, the secondary damage of steering fluid to the reservoir can be reduced, and the purposes of carbonate acid fracturing well stimulation and stable production are achieved.

[Problem] To provide a slurry composition for a lithium-ion secondary cell negative electrode making it possible to obtain a secondary cell having excellent cycling characteristics, and a negative electrode having excellent binding properties. [Solution] This slurry composition for a lithium-ion secondary cell negative electrode contains a negative-electrode active substance (A), a water-soluble polymer (B), and water (C), wherein the water-soluble polymer (B) contains a water-soluble polymer (B1) that is a polymer alkali metal salt containing an ethylenically unsaturated acid monomer unit and a fluorine-containing (meth)acrylate monomer unit, and a water-soluble polymer (B2) that is a polymer alkali metal salt containing at least 80 percent by mass of an ethylenically unsaturated acid monomer unit, the viscosity of a 5% aqueous solution of the water-soluble polymer (B1) being 100-1500 cp, and the viscosity of a 5% aqueous solution of the water-soluble polymer (B2) being 2000-20000 pc.

The invention discloses equipment for double-membrane desalination through the synergistic effect of a pressure field and an electric field and an application method. The equipment comprises reverse osmosis membranes, anion and cation membranes, an electrode and the like, wherein the electrode is electrified and pressurized for inflowing water so that the equipment runs in both the electric field and the pressure field simultaneously. The reverse osmosis membranes and the anion and cation membranes in the equipment are perpendicularly arranged to form a plurality of reaction cells, and effluent water acted by the anion and cation membranes is directly drained through a water outlet pipe connected with the reaction cells. The adjacent reverse osmosis membranes are taken as a group of reverse osmosis system, and the water outlet galleries of the reverse osmosis system are formed among the membranes at intervals. The equipment is applied to realize the simultaneous conducting of reverse osmosis process and electroosmosis processes; the pressure field and the electric field have influence on each other; through the action of the pressure field, the electroosmosis effect can be enhanced, the ion migration rate can be speeded up, the desalination rate can be improved, and the energy consumption can be reduced; through the action of the electric field, the migration of ions in waste water can be promoted, the solvent migration resistance in reverse osmosis process can be reduced, the recovery rate of water can be improved, and the pollution problem of the reverse osmosis membrane can be overcome.

The invention provides a double perovskite negative electrode material prepared through template synthesis and used for a potassium ion battery, and a preparation method thereof. The invention is characterized in that the composition of the negative electrode material is KY<0.8>Ba<0.2>Cr<0.9>Zn<0.1>Mo<0.9>Fe<0.1>O<6>; the continuous channel structure of gel is employed as a template in the process of preparation, and a double perovskite-structured product with continuous porous morphology and mutually bonded particle parts is formed, wherein such morphology is beneficial for reducing crystal boundary resistance and electron transfer resistance and accelerating potassium ion migration capability and oxidation reduction reaction rate; the double perovskite negative electrode material has certain structural rigidity, so buffering is formed for volumetric changes of the material during charging and discharging ; furthermore, due to co-occupation of position A by K and Y, electronic conductivity is improved; due to partial Ba doping at position Y, the conductivity of potassium ions is improved; Zn and Fe doping at position B can improve the stability of a perovskite structure; and thus, the potassium ion battery negative electrode material with high performance is eventually formed.

The invention provides a quick-charging type lithium ion battery. The battery comprises a positive electrode, a negative electrode, diaphragms and electrolyte. The positive electrode, the negative electrode and the diaphragm are installed in a battery shell; the electrolyte is injected into the battery shell; the battery shell is sealed; and therefore, the quick-charging type lithium ion battery can be formed. The positive electrode is prepared from the following components in percentage by mass: 97.3 percent of lithium cobalt oxide; 1.5 percent of acetylene black; and 1.2 percent of polyvinylidene fluoride. The negative electrode is prepared from the following components in percentage by mass: 95 percent of secondary carbon beads; 2 percent of acetylene black; 1.3 percent of carboxymethylcellulose; and 1.7 percent of butadiene styrene rubber. The diaphragm is a ceramic diaphragm. The electrolyte is non-aqueous electrolyte. According to the lithium ion battery, the quick charging performance of the battery is improved, and the rate cycle performance, especially the high-current rate (10C) cycle performance of the battery is effectively improved.

The invention discloses an electrolyte, which comprises carboxylic ester and halogenated methane. The carboxylic ester can be combined with cations of the electrolyte, haloalkane has a small volume, arole of a lubricant can be played, ion migration resistance is reduced, and ionic conductivity of the electrolyte is thus improved. A potassium salt additive can change the solvation condition of thecations inside the electrolyte and an electrode interface film-forming reaction form, a thin and stable SEI film can be formed on the surface of a negative electrod, and the resistance of the ions embedded in the negative electrode can be reduced. An AgPF6 additive can perform reduction on the surface of the negative electrode to form nano-Ag particles, the SEI film charge transfer impedance is reduced, and the ion embedding/de-embedding resistance is reduced. Through combined actions of the carboxylic ester, the halogenated methane, the electrolyte and the additives, the discharge performance and the cycle performance of the battery below -40 DEG C can be improved, and the battery can perform discharge in a deep low temperature environment of -70 DEG C. The invention also provides an electrolyte preparation method and a battery containing the electrolyte.

The invention provides a template-synthesized double-perovskite lithium battery negative electrode material and a preparation method thereof. The negative electrode material is characterized in that the composition of the negative electrode material is Sr0.8LaMg0.1K0.1Cr0.9Zn0.1W0.9Fe0.1O6; in the preparation process, a continuous porous morphology and double-perovskite structure product of which particles are partially bonded mutually is formed by taking a continuous porous structure of gel as a template; the morphology is beneficial for reducing the crystal boundary resistance and the electron migration resistance, improving the lithium ion migration capacity and increasing the rate of a redox reaction and has the certain structure rigidity to form buffer for material volume changes in the charging and discharging process; and furthermore, the electron conductivity is improved by means of Sr and La common occupy at the A position, the lithium ion conductivity is improved by means of Mg doping at part of the Sr position, the sinterability of the particles is improved by means of K doping, the stability of the perovskite structure is improved by means of Zn and Fe doping at the B position, and finally the high-performance lithium battery negative electrode material is prepared.

The invention discloses a vanadium sodium phosphate cathode material doped with ruthenium and wrapped in carbon and a preparation method of the cathode material. A vanadium sodium phosphate electrodematerial is doped with ruthenium ions and wrapped in carbon. The first discharge capacitor and circulation performance of the vanadium sodium phosphate cathode material are improved, the method is simple, and the material is easy to produce in batch and popularize and use.

The invention discloses a high-nickel positive electrode-lithium carbon negative electrode lithium ion battery and a preparation method thereof, the lithium ion battery comprises a positive electrodeplate, a negative electrode plate, a ceramic diaphragm, an electrolyte and a battery shell, the positive electrode plate, the ceramic diaphragm, the negative electrode plate and the ceramic diaphragmare sequentially and repeatedly laminated to form a dry battery cell; the lithium ion battery is prepared by putting a dry battery cell into a battery shell, injecting electrolyte, opening for formation, sealing and grading capacity, and is characterized in that a positive plate and a negative plate are respectively a multi-element high-nickel positive plate and a lithium-carbon composite negativeplate, positive plate reserved tabs are arranged on the front surface and the back surface of the positive plate, and negative plate reserved tabs are arranged on the front surface and the back surface of the negative plate; through application of preferred materials and optimization of the process technology, the mass energy density of the prepared lithium ion battery reaches 350 wh/kg or above,and the lithium ion battery is very suitable for application in the fields of 3C, power, energy storage and the like.

The invention belongs to the technical field of energy saving, and relates to a high-filling-ratio loop thermosiphon based on the multi-scale synergistic hydrophobic surface. The high-filling-ratio loop thermosiphon can be used for cooling a high-temperature part under the complex working condition; according to the high-filling-ratio loop thermosiphon based on the multi-scale synergistic hydrophobic surface, besides a heating area and a cooling area, other pipelines are multi-scale synergistic hydrophobic surface heat transfer pipelines; and the heating area on the high-filling-ratio loop thermosiphon based on the multi-scale synergistic hydrophobic surface is lower than the cooling area on the high-filling-ratio loop thermosiphon based on the multi-scale synergistic hydrophobic surface.The heat transfer coefficient can be increased by 20% or above, flowing resistance can be lowered greatly, and the small-power stable operation effect is improved.

The invention discloses a novel method for preparing a lithium titanate-carbon nanotube electrode material. The method comprises the steps that S1 an NMP mixture containing 4 wt% carbon nanotube, dioland titanate are added to a homogeneous reaction device, and stirred for polymerization reaction to form polymer mixed slurry A with the carbon nanotube and suction filtration slurry A, and washing with a methanol solution is carried out to acquire a polymer M with the carbon nanotube; S2 the carbon nanotube-containing polymer M and a lithium compound are mixed and dissolved in water, and then placed in a homogeneous reactor, and after stirring and hydrolysis reaction, mixture slurry B and suction filtration slurry B are acquired and washed with a methanol solution to acquire a solid N; and S3 after the solid N is sintered in an inert atmosphere in a high-temperature furnace, the lithium titanate-carbon nanotube electrode material is acquired. The lithium titanate-carbon nanotube electrode material prepared by the preparation method provided by the invention can realize charge and discharge under large current, and overcomes the problems of capacity attenuation and poor rate performance during charge and discharge under large current.