177results about How to "High magnification" patented technology

The invention provides a high-rate ultralow-temperature sodium-ion battery electrolyte as well as a preparation method and application thereof, and belongs to the technical field of sodium-ion batteries. The super-low-temperature sodium-ion battery electrolyte capable of operating at-60 DEG C is obtained by taking a strong-solvation carbonic ester solvent as a main solvent and matching with a weak-solvation ether diluent, a film-forming additive and sodium salt. Besides, the solvent-solvent strong interaction between the ether diluent and the carbonic ester solvent in the system weakens the interaction between Na < + > and the strong solvent, thereby realizing the improvement of sodium ion kinetics, realizing high rate and high cycle stability at room temperature, and showing higher capacity and cycle stability at low temperature of-60 DEG C.

The invention provides a sodium ferric pyrophosphate positive electrode material cooperatively doped with anions and cations, a preparation method of the sodium ferric pyrophosphate positive electrode material and a sodium ion battery, and relates to the field of sodium ion batteries. The anion and cation synergistically doped ferric sodium phosphate pyrophosphate positive electrode material comprises an inner core and a coating layer covering the outer surface of the inner core, the inner core comprises ferric sodium phosphate pyrophosphate, the coating layer comprises carbon, the chemical formula of the ferric sodium phosphate pyrophosphate is Na4-2yFe2.91-xQx (PO4) 2-yP2O7Fy, x is more than 0 and less than or equal to 0.3, and y is more than or equal to 0.03 and less than or equal to 0.08; q comprises at least one of Sn, Ni, Cu, Mg and Mn. The introduced Q positive ions and F negative ions can keep the crystal structure of the body material stable, and the positive ions and the negative ions have a synergistic effect, so that the band gap of the positive electrode material is reduced, the state density near the Fermi level of the positive electrode material is increased, the conductivity of the positive electrode material is enhanced, the specific capacity of the positive electrode material is improved, and the rate and the cycle performance are promoted.

The invention provides an optical imaging lens, the optical imaging lens has eight lenses with focal power, and the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element in the direction of the optical axis of the optical imaging lens meet the following condition: f7 / EP67 is more than or equal to-8.25 and less than or equal to-6.82; the curvature radius R15 of the object side face of the eighth lens and the inner diameter d7m of the image side face of the seventh spacing element meet the condition that R15 / d7m is larger than or equal to 1.31 and smaller than or equal to 2.28. The multi-group optical imaging lens solves the problems that in the prior art, the rear end forming yield of the multi-group optical imaging lens is low, and stray light is serious.

The invention relates to the technical field of electrochemistry, in particular to a high-entropy Prussian blue analogue positive electrode material, a preparation method and application. Preparing manganese source, iron source, cobalt source, nickel source and copper source solutions; the preparation method comprises the following steps: dispersing a potassium ferrocyanide precursor and a potassium citrate chelating agent in deionized water, adding quantitative manganese source, iron source, cobalt source, nickel source and copper source solutions after uniformly dispersing, and continuously stirring in the adding process until all the solutions are dropwise added; centrifugally washing the obtained mixed solution by using deionized water and absolute ethyl alcohol; drying the centrifugally washed colloid in a vacuum drying box; the obtained solid particles are ground into uniform powder, and the high-entropy Prussian blue analogue positive electrode material is prepared by adopting the preparation method; the material can be used as a sodium ion battery positive electrode material. The content of crystal water is reduced, and side reactions in the electrochemical process are reduced. Excessive crystal defects are improved; the structural stability is improved; and the sodium ion diffusion barrier is reduced.

The invention provides a lithium-mixed coated modified ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium battery raw materials. Various lithium sources are mixed according to a certain proportion to prepare a ternary positive electrode, co-doping modification is carried out through cooperation of Li3PO4 and a W / Al / Zr / Y / B-containing compound, double-layer coating modification is carried out through cooperation of the Li3PO4 and a Ti / Al-containing compound for primary coating and cooperation of an anhydrous Li compound and TiP2O7 or Ti3 (PO4) 4 for secondary coating, and a double-gradient fast ion conductor coating layer is constructed. The structural stability, the thermal stability, the first discharge capacity and efficiency, the multiplying power, the circulation and storage performance and the like of the single-crystal or polycrystal ternary positive electrode material under different voltage and power conditions are improved; the lithium-mixed multi-element composite ternary positive electrode provided by the invention has the advantages of more stable layered structure, higher safety, higher electronic conductivity, better multiplying power, high specific capacity and long cycle performance.

The invention provides a preparation method of an electron-ion mixed conductor sulfide electrolyte material, which is characterized by comprising the following steps: taking a sulfide solid electrolyte as an inner core, taking a two-dimensional transition metal layered material MXene as a surface coating layer, and coating the surface of the inner core with the two-dimensional transition metal layered material MXene, and carrying out ball milling and calcining to obtain the electron-ion mixed conductor sulfide electrolyte material. The two-dimensional transition metal layered material MXene is used as a surface coating layer, the air stability of the sulfide solid electrolyte is improved, calcination treatment is carried out, S in the sulfide solid electrolyte is combined with metal ions in MXene, the sulfide solid electrolyte has high electronic conductivity, the appearance of a space charge layer can be inhibited, and the performance of the sulfide solid electrolyte is improved. The electronic conductivity of the positive electrode is improved, the multiplying power of a battery cell is improved, the content of conductive carbon is reduced, and the intrinsic ion conductivity of sulfide electrolyte can be kept to the maximum extent.

The battery top cover for the secondary battery comprises a positive / negative terminal, a top cover substrate and a lower plastic part, the positive / negative terminal comprises a plane part and a protruding part formed by stamping, and the back surface of the protruding part is provided with a concave part; the protruding part of the terminal penetrates through the top cover substrate and the lower plastic part, the lower end of the terminal can be connected with the switching piece when the battery is assembled, and the plane part of the terminal is matched with the switching piece to clamp the top cover substrate and the lower plastic part; a positive / negative insulating ring, a fixing ring and a sealing ring are sleeved on the protruding part of the terminal; a plurality of upper bulges matched with the terminals and lower bulges matched with the top cover substrate are respectively arranged on the upper surface and the lower surface of the positive / negative electrode insulating ring; the array radiuses of the upper bulges and the lower bulges are different; a plurality of lower grooves matched with the upper bulges are formed in the plane part of the terminal; a plurality of upper grooves matched with the lower bulges are formed in the top cover substrate; an annular bulge is arranged on the upper surface of the fixing ring; sawtooth structures are arranged on the inner circumferential wall and the outer circumferential wall of the annular protrusion. According to the utility model, the simplification and integration of the structure are realized, and the performance and the manufacturing efficiency of the battery cell top cover are improved.

The invention provides a positive pole piece, a preparation method thereof and a lithium ion battery. The positive pole piece comprises a positive current collector and a negative current collector, the first active coating is arranged on the surface of at least one side of the positive electrode current collector; the raw materials of the first active coating comprise a first main material, a first conductive agent and a low-swelling binder; the second active coating is arranged on the surface of one side, relatively far away from the positive electrode current collector, of the first active coating; and raw materials of the second active coating comprise a second main material, a second conductive agent and a high-swelling binder. Different types of binders are introduced into the first active coating and the second active coating, so that the tortuosity and porosity of the pole piece are changed, the diffusion rate of lithium ions is effectively improved, the concentration polarization of the surface layer of the pole piece is reduced, and the rate and cycle performance of the battery are remarkably improved. Particularly, the positive pole piece can achieve the goal of improving the multiplying power and the cycle performance without increasing the proportion of the conductive agent.

The invention discloses a hard carbon negative electrode material for a sodium-ion battery as well as a preparation method and application of the hard carbon negative electrode material. The hard carbon negative electrode material for the sodium ion battery is a graphite microcrystal cross-linked hard carbon material, and the carbon layer spacing is 0.37 nm to 0.40 nm; the range of the Raman D / G (w) value is 1.1-1.6; and the compaction density of the 3T powder is 0.96 g / cm < 3 >-1.10 g / cm < 3 >. The hard carbon negative electrode material for the sodium ion battery has high capacity, high compaction, high magnification and high cycle performance; meanwhile, amorphous carbon is directionally etched through chemical reaction, and a second carbon source is compounded on the basis, so that the crosslinking degree between graphite microcrystals (a structural unit of hard carbon) is improved, open pores are further promoted to be converted into closed pores, sodium storage sites of the closed pores are increased, and the density and conductivity of the hard carbon material are improved; and the capacity, the compaction density, the multiplying power and the cycle performance are improved.

The invention relates to the field of lithium ion batteries, in particular to a fluorine-containing soluble polyimide adhesive special for a lithium battery and a preparation method and application of the fluorine-containing soluble polyimide adhesive. The fluorine-containing polyimide is prepared by reacting dianhydride and diamine, the dianhydride comprises 3, 3 ', 4, 4'-benzophenone tetracarboxylic dianhydride, the diamine comprises 4, 4 '-bis (4-amino-2-trifluoromethylphenoxy) biphenyl and 1, 3-bis (3-aminopropyl)-1, 1, 3, 3-tetramethyldisiloxane, the structure of the fluorine-containing polyimide in the adhesive is as shown in a formula I: # imgabs0 #, and the fluorine-containing polyimide in the adhesive is fluorine-containing polyimide. The groups A and B are independently selected from # imgabs 1 # or # imgabs 2 #, and A is different from B. The adhesive is applied to a lithium ion battery, especially a silicon negative electrode lithium ion battery, shows excellent rate capability and adhesive performance, and has a good industrial prospect.

The invention discloses a polymer electrolyte, a preparation method and application. The polymer electrolyte provided by the invention comprises a polymer elastomer and a multi-element deep eutectic electrolyte, the multi-element deep eutectic electrolyte comprises a lithium salt, a hydrogen bond donor and an additive containing O = S = O groups, and the molar ratio of the lithium salt to the hydrogen bond donor to the additive containing the O = S = O groups is (5-20): (60-90): (2-20). The polymer electrolyte provided by the invention has good rate capability at room temperature and good charge-discharge cycle performance in a wide temperature range of-60 DEG C to 120 DEG C, and can be matched with a positive electrode material with higher working voltage, so that the energy density of a battery is remarkably improved.

The invention discloses an intelligent processing system and method for a magnetoelectric tachometric transducer, and relates to the technical field of engine control, the system comprises an electronic control unit, a signal acquisition circuit, an amplification circuit and a signal calculation circuit; the signal acquisition circuit is used for acquiring a voltage signal output by the magnetoelectric rotating speed sensor; the amplifying circuit is used for amplifying the voltage signal to obtain an amplified signal; the signal calculation circuit is used for calculating the rotating speed of the engine at the second moment according to the amplified signal; the amplifying circuit is used for amplifying the voltage and comprises a numerical control variable resistor; the resistance value of the numerical control variable resistor is controlled by the electronic control unit, the amplification factor is adjusted by adjusting the resistance value, when the rotating speed is low and the signal is weak, the signal amplification factor is large to ensure that the signal can be normally detected, and when the rotating speed is high and the signal is strong, the signal amplification factor is small to reduce the interference signal.

The invention belongs to the field of energy storage of new energy materials, and relates to an asphalt-based hard carbon negative electrode material with high initial efficiency, high magnification and high capacity and a preparation method thereof. The hard carbon negative electrode material has a long and complete carbon layer edge, the specific surface area is 2-8 m < 2 > / g, and / or the aperture of the hard carbon negative electrode material is 1-12 nm. The method comprises the following steps: pre-oxidizing asphalt, mixing the pre-oxidized asphalt with a fusion repair-decomposition etching dual-function additive, and carrying out two-step high-temperature carbonization treatment in an inert atmosphere: melting metal salt in the first step of high-temperature carbonization so as to catalytically connect an edge carbon layer and repair defects; in the second step of high-temperature carbonization, the metal salt is decomposed to generate gas, pores are formed in the material, and the temperature of the first step of high-temperature carbonization is controlled to only melt the metal salt but not decompose the metal salt. Through single-additive two-step reaction, the first coulombic efficiency, the rate capability and the capacity are improved at the same time.

The invention discloses a sulfur-doped composite hard carbon material as well as a preparation method and application thereof. Sulfonated resin is used as a carbon source and a sulfur source, and non-metal sulfur atoms with the atomic radius larger than that of carbon are doped in situ, so that the carbon layer spacing of hard carbon is increased, and the rate capability of the hard carbon is improved; and the sulfonated resin is subjected to surface pre-coating modification by using a cheap biomass carbon source, so that the specific surface area and defect sites of hard carbon are reduced, the number of closed pores is increased, and the specific capacity and the first coulombic efficiency of the hard carbon are improved.

The invention provides a positive electrode material, a positive electrode plate and a secondary battery. The positive electrode material contains an element M, the element M is selected from at least one metal element in IA group and IIA group in the periodic table of elements, the distribution of the element M in particles meets the condition that X2 / X1 is greater than or equal to 1.2 and less than or equal to 20, X1 is the concentration of the element M in the central region of the particles, X2 is the concentration of the element M in the surface region of the particles, and X3 is the concentration of the element M in the surface region of the particles. The surface of the positive electrode material contains nitrate ions, the content of the nitrate ions is N1, and N1 is more than or equal to 10ppm and less than or equal to 100ppm. The positive electrode material disclosed by the invention has relatively high structural stability and relatively small number of microcracks, a stable interface protection layer can be formed on the surface of the positive electrode material, and side reaction between an electrolyte and the surface of the positive electrode material is reduced, so that the capacity and the cycle performance of a battery prepared from the positive electrode material are comprehensively improved, and meanwhile, the gas production performance is improved.

The invention discloses a multi-component gas laser synchronous detection system and method, and belongs to the technical field of laser spectrum gas detection. According to the invention, the corresponding absorption peak position is obtained through the concentrations of CH4, H2S, O2 and CO standard gases in the multi-component sealed gas pool, and the laser driving module is regulated in real time to lock the central wavelength output by the corresponding laser module; a laser driving module synchronously outputs CH4 and H2S analog voltage signals in the same direction and O2 and CO analog voltage signals in the reverse direction to drive a corresponding CH4 laser, a H2S laser, an O2 laser and a CO laser, paired analog voltage signals in opposite directions can be synchronously output, and modulation amplitudes of current modulation signals of the four lasers are mutually counteracted when gas to be detected is detected. And meanwhile, absorption signal positions of the four gases can be arranged at strong light intensity positions, so that the amplitude values and the signal-to-noise ratios of the absorption signals of the four gases are remarkably improved, and the synchronous absorption detection precision of the four gases is greatly improved.

The embodiment of the invention relates to the technical field of optics, and discloses a camera shooting optical lens which is composed of a first prism, a first lens group and a second lens group. The first lens group comprises a first lens and a second lens; the second lens group comprises a third lens, a fourth lens and a fifth lens; the first lens group can be moved and adjusted: 4.00 < = fA / IH < = 4.80; 0.10 < = Rp1 / Rp2 < = 1.00; 0.20 < = d5 / d7 < = 1.20. The five-piece lens is divided into the first lens group and the second lens group, and the first lens group moves for focusing, so that the focusing mode of internal focusing of the optical lens is realized; the ratio of the focal length to the image height of the optical lens in the first state is set, and the optical lens has a relatively long focal length under the condition that the image height is fixed, so that the magnification of the optical lens can be improved; due to the concave-convex shape of the first prism, the deflection degree of light passing through the lens can be relieved; the thickness of the third lens and the thickness of the fourth lens are reasonably distributed, so that the optical total length of the optical lens can be compressed.

The invention relates to a camera shooting optical lens which is composed of a first prism, a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side. The maximum focal length of the shooting optical lens is fA, the back focus is BF, the image height is IH, the distance between the lens surface closest to the object side and the lens surface closest to the image side in the maximum focusing process on the optical axis is Lp, the total optical length is TTL, the curvature radiuses of the object side surface and the image side surface of the first prism are Rp1 and Rp2 respectively, the curvature radiuses of the object side surface and the image side surface of the fifth lens are R9 and R10 respectively, and fA * BF / IH is larger than or equal to 6.00 and smaller than or equal to 13.00. 0.40 < = Lp / TTL < = 0.51; rp1 / Rp2 is greater than or equal to-4.01 and less than or equal to-0.80; -0.80 < = (R9 + R10) / (R9-R10) < =-0.30. The camera shooting optical lens has the characteristics of long focal length, high magnification and miniaturization.

The invention discloses in-situ carbon-coated multi-cation doped lithium manganese iron phosphate and a preparation method thereof, the preparation method comprises the following steps: firstly synthesizing ternary metal cation doped MnxFe1-x-a-b-cAaBbCc-MOF through a solvothermal method, wherein x is more than 0 and less than 1, a is more than 0 and less than 0.04, b is more than 0 and less than 0.04, c is more than 0 and less than 0.04, and a + b + c is equal to 0.05; a, B and C are respectively one of doped metal elements Mg, Ti, V, Co, Ni, Cr, Zn, Cu, Zr and Nb, and A, B and C are different from one another; and then mixing the in-situ carbon-coated multi-cation doped lithium manganese iron phosphate serving as a precursor with a lithium source and a phosphorus source, grinding, spray-drying, and calcining in an inert atmosphere to obtain the in-situ carbon-coated multi-cation doped lithium manganese iron phosphate. According to the invention, atomic-scale uniform distribution of iron and manganese metal elements and three doped cations in the lithium manganese iron phosphate can be realized, the synergistic effect of the doped metal cations is fully exerted, the structural stability of the material is improved, and the electrochemical performance of the lithium manganese iron phosphate is further optimized.

The invention discloses a resin-based hard carbon composite material and application thereof in button type half-cell preparation. The method comprises the following steps: melting phenol, and adding a formaldehyde solution to prepare a mixed solution A; dispersing the carbon nano tube powder and hexadecyl trimethyl ammonium bromide in pure water, and grinding to obtain carbon nano tube dispersed slurry B; and adding the carbon nanotube dispersion slurry B into the mixed solution A to obtain a mixed solution C, adjusting the pH value to prepare a phenolic resin precursor solution, carrying out cross-linking curing to prepare a phenolic resin cured precursor, carrying out mechanical grinding, and putting the phenolic resin cured precursor into a tubular furnace to finally prepare the resin-based hard carbon composite material. Conductive carbon is introduced to the condensation polymerization end of phenol and formaldehyde, a communicated conductive network is formed in the composite material by regulating and controlling the material composition, the electron transmission distance between particles is shortened, the intrinsic conductivity of original resin carbon is improved, and the composite material has the advantages of high capacity, high first efficiency, high magnification and low ash content; wide application prospects are realized in the field of lithium ion battery negative electrode materials.

The invention discloses a preparation method of micro-expanded graphite, which comprises the following steps: uniformly kneading and mixing graphite, an oxidant solid and an inorganic acid, standing, then adding water to carry out micro-expansion treatment, carrying out solid-liquid separation, drying, and calcining to obtain the micro-expanded graphite. The invention also discloses the micro-expanded graphite which is prepared according to the preparation method of the micro-expanded graphite. The invention also discloses an application of the micro-expanded graphite in a negative electrode material. The method is simple to operate and low in cost; good conductivity can be maintained while micro-expansion of the graphite is realized; the obtained micro-expanded graphite has high magnification and long cycle performance at the same time.

The invention provides an optical imaging lens, the optical imaging lens has eight lenses with focal power, and the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f4 of the fourth lens and the interval EP34 between the third spacing element and the fourth spacing element in the direction of the optical axis of the optical imaging lens meet the condition that f4 / EP34 is greater than or equal to-10.62 and less than or equal to-5.20; the curvature radius R8 of the image side face of the fourth lens, the outer diameter D4s of the object side face of the fourth spacing element and the inner diameter d4s of the object side face of the fourth spacing element meet the condition that R8 / (D4s-d4s) is larger than or equal to 0.87 and smaller than or equal to 1.65. The multi-group optical imaging lens solves the problems that the middle group of the multi-group optical imaging lens in the prior art is unstable and stray light is serious.

The invention relates to the field of optical detection, in particular to a differential interference confocal displacement measurement system and method based on microsphere assistance, and the measurement system comprises a laser light source, a test platform, an optical detection structure, a beam splitting structure, a first polarization beam splitting structure, a second polarization beam splitting structure, a detection unit and a signal processing unit. The test platform is used for placing a sample, transparent microspheres are uniformly attached to the surface of the sample, and the transparent microspheres are used for increasing the magnification times of the sample during imaging; linearly polarized light output by the laser light source sequentially passes through the optical detection structure, the beam splitting structure, the first polarization beam splitting structure and the second polarization beam splitting structure to generate four paths of interference signals with phases of 0 degree, 90 degrees, 180 degrees and 270 degrees, the four paths of interference signals are received by the detection unit, and after photoelectric conversion, the interference signals are transmitted to the signal processing unit to calculate the surface height of a sample. The transverse resolution of the measurement system can be improved through the transparent microspheres attached to the surface of the sample, and the imaging quality is enhanced.

The utility model discloses an oblique translation vehicle-mounted camera device, which comprises a camera main body, an image acquisition unit and an imaging lens, and is characterized in that the imaging lens and the image acquisition unit are sequentially mounted in the camera main body; and the center of the image acquisition unit has a predetermined oblique offset relative to the intersection point of the optical axis of the imaging lens and the plane of the image acquisition unit. By adopting the camera device in which the central point of the image acquisition unit is obliquely translated, the effective area of the image acquisition unit can be utilized to the maximum extent, and the problem of perspective deformation caused by the fact that a camera is obliquely mounted towards the outer side of a vehicle body and the ground due to the acquisition angle requirement is avoided; and meanwhile, a visual field observation area meeting the requirements of GB1508-2022 and ECE R46 laws and regulations can be provided.

The invention provides a method for preparing a composite solid electrolyte through a Lewis fluorine supply nano additive, and the composite solid electrolyte comprises the following components in parts by weight: 10-20 parts of a polymeric monomer, 2-6 parts of a lithium salt, 1-4 parts of a nano functional additive and 5-12 parts of an organic solvent. When the prepared composite solid electrolyte is used for a lithium ion battery, the composite solid electrolyte has the characteristics of no need of an additional initiator, uniform polymerization reaction, high ionic conductivity and the like, and the stability, the rate and the cycle performance of the semi-solid lithium ion battery can be improved; according to the preparation method, no extra initiator is added into the preparation raw materials of the in-situ cured solid electrolyte, the lithium salt is instably decomposed into the lewis acid in a heating state, the lewis acid is utilized to efficiently initiate ring-opening of cyclic ether to perform polymerization reaction, no initiator is left, and no extra side reaction is generated to cause reduction of battery performance.

The present invention discloses a microscopic imaging objective lens and an imaging method thereof for fiber core identification of an optical fiber fusion splicer. It adopts a coaxial transmission optical imaging structure, and along the incident direction of light, it is sequentially composed of a front group consisting of a concave-convex spherical positive lens and a meniscus spherical negative lens glued together, and a rear group consisting of a double convex spherical positive lens, a meniscus spherical negative lens and a meniscus spherical thick positive lens separated. The imaging objective lens provided by the present invention has the advantages of high resolution, small distortion, good imaging performance, short optical tube length, low processing cost, simple and compact structure, etc. Its imaging performance reaches the diffraction limit, and the resolution is as high as 2μm, which is much higher than the fiber end face diameter size of 10μm; the magnification reaches 5 times, and the fiber end face can be finely imaged, high-precision alignment can be achieved, and the fiber type can be accurately identified; at the same time, it solves the problems of large fusion loss and unstable fusion in the prior art, and meets the use requirements of the core alignment type optical fiber fusion splicer.

The invention provides a positive electrode active material and a preparation method thereof, a positive plate and an all-solid-state lithium battery, and relates to the field of lithium ion batteries, the positive electrode active material comprises a layered oxide and a coating layer coating the surface of the layered oxide, and the coating layer comprises a polyanion lithium salt and conductive carbon; the thickness of the coating layer is larger than 10 nm and smaller than 30 nm. The coating layer comprises the polyanion lithium salt and the conductive carbon, and the two substances cooperate with each other, so that direct contact between the layered oxide and the solid electrolyte can be better isolated, and side reaction is avoided. And moreover, the conductive carbon in the coating layer can reduce the electron transmission impedance, so that the improvement of the electrochemical performance of the positive electrode active material is facilitated.

The invention belongs to the field of batteries, and particularly relates to a positive electrode material and a preparation method thereof, a positive plate and a lithium-sulfur battery. The preparation method of the positive electrode material comprises the following steps: (1) uniformly mixing polyacrylonitrile, transition metal salt and CTAB (Cetyltrimethyl Ammonium Bromide) in an organic solvent to obtain a solution A; dissolving 2-methylimidazole into an organic solvent to obtain a solution B; adding the solution B into the solution A to obtain ZIF-PAN; and 2) mixing the ZIF-PAN with sulfur powder, then carrying out ball milling, drying, and then carrying out calcination treatment to obtain the positive electrode material. According to the invention, transition metal sulfide derived from the MOF material is compounded with SPAN in situ, and the SPAN-based composite material with high sulfur loading capacity, high cycle, high magnification and low resistivity is synthesized as the positive electrode material by regulating the type of transition metal and the addition amount of a surface additive and utilizing the advantages of the MOF material that the morphology is regular and adjustable and the like, and is used for the positive electrode of a lithium-sulfur battery, so that the service life of the lithium-sulfur battery is prolonged, and the service life of the lithium-sulfur battery is prolonged. The electrochemical performance is obviously improved.

The invention relates to a key technology for coating a positive electrode of a lithium ion capacitor. Commercial activated carbon and hard carbon (HC) are respectively used as positive and positive electrode active materials to assemble the lithium ion capacitor. The invention relates to a key technology for coating a positive electrode, namely selection of a binder system. Specifically, the positive electrode material is composed of the following components in percentage by mass: 88-92% of a positive electrode main material, 5-7% of a conductive agent, 1-2% of water-based green pollution-free sodium carboxymethyl cellulose (CMCC) serving as a binder and 2-3% of styrene butadiene rubber emulsion (SBR). By adjusting the ratio of the positive electrode main material to the sodium carboxymethyl cellulose and adding the butadiene styrene rubber emulsion in a proper ratio into the positive electrode slurry after the ratio of the positive electrode main material to the sodium carboxymethyl cellulose is adjusted, the performance of the positive electrode plate is effectively improved, and the electrochemical performance of the lithium ion capacitor is effectively improved.

The invention relates to a negative pole piece as well as a preparation method and application thereof, and belongs to the technical field of secondary batteries. The negative pole piece comprises a negative active material layer and a negative current collector, and the negative active material layer is attached to the negative current collector; the negative electrode active material layer comprises a negative electrode active material, the negative electrode active material comprises a first material and a second material, the first material comprises a pre-magnesium silica material, the pre-magnesium silica material is a pre-magnesium silica body of which the surface is modified with nitrogen, and the second material comprises graphite; nitrogen modification is carried out on the surface of a pre-magnesium silica material, more Li3N components are generated when SEI is generated on the surface of the pre-magnesium silica material in the charging and discharging process, and Li3N generated in situ is a stable inorganic substance with high ion conductivity, so that the problem of poor lithium ion conductivity caused by magnesium silicate on the original surface of the material can be solved; furthermore, the rate and the cycle performance of the battery are improved, and the effect of improving the electrochemical performance of the pre-magnesium silica material is achieved.