33results about How to "Reduce migration resistance" patented technology

The invention discloses a PEO-based solid electrolyte film and a preparation method and application thereof, the PEO-based solid electrolyte film comprises a polymer matrix and a lithium salt, the polymer matrix is selected from PEO, and the lithium salt is selected from LiTFSI; the PEO-based solid electrolyte film also comprises a molecular coordination regulator and a filler, the molecular coordination regulator is selected from DFBOP, and the filler is selected from LLZTO. According to the PEO-based solid electrolyte film disclosed by the invention, the problems of poor lithium stability and high-voltage compatibility of PEO-based solid electrolyte can be remarkably improved, and the cycling stability and rate capability of a PEO-based solid lithium metal battery can be remarkably improved.

The invention discloses an iron-based positive electrode lithium supplementing material, a preparation method thereof, a positive electrode material and an iron-based positive electrode lithium supplementing material, the iron-based positive electrode lithium supplementing material comprises a base material, doping elements and a coating layer, the base material is Li5FeO4, the doping elements are Co and Sr, and the coating layer is a carbon coating layer coating the surface of the Li5FeO4 base material. The prepared positive electrode lithium supplementing material has the advantages of stable structure, good conductivity and excellent air stability.

The invention provides a fluorine-containing polymer wetting reversal agent suitable for shale reservoir protection as well as a preparation method and application of the fluorine-containing polymer wetting reversal agent. The preparation method of the reverse wetting agent comprises the following steps: adding ethylamine, triethylamine and deionized water into a reaction flask, and adding perfluorooctanoyl chloride into the system for reaction; after the reaction is completed, potassium hydroxide and 2-chloroethanol are continuously added for reaction; and after the reaction is completed, obtaining the N-ethyl-N-hydroxyethyl perfluorooctanamide. Adding nanoparticles, a silane coupling agent and ammonia water into the dispersant solution, and carrying out a modification reaction to obtain a modified nanoparticle solution; and adjusting the pH value of the obtained modified nanoparticle solution to 5-9, adding N-ethyl-N-hydroxyethyl perfluorooctanamide, introducing nitrogen to remove oxygen, adding an initiator, and carrying out thermal initiation polymerization reaction to obtain the composite material. The wetting reversal agent disclosed by the invention has excellent wetting reversal performance and a certain filtration reduction effect, and provides innovative thinking for development of a high-performance water-based drilling fluid technology.

The invention provides a metal organic framework sodium ion battery positive electrode material Mn-PTO, a preparation method and application, and belongs to the technical field of battery development. According to the material, an organic ligand pyrene tetraketone with conjugate extension is selected, 2, 7-dicarboxyl-4, 5, 9, 10-pyrene tetraketone PTO-(COOH) 2 is synthesized through a series of reactions, and the material has four energy storage sites and can provide high specific capacity. The high reversible specific capacity of 160.1 mAh g < 1 > can be achieved under the current condition of 0.1 A g < 1 >; even under the current condition of 5A g < 1 >, the reversible specific capacity of 118.1 mAh g < 1 > can be realized after 7000 cycles. And stable circulation can be carried out for 10000 times under the high current of 10A g < 1 >. Therefore, the material has huge potential in the aspect of being used as a sodium-ion battery positive electrode.

The invention discloses a uniformly-distributed defect-free c-PIMs / MOFs composite membrane as well as a preparation method and application thereof, and belongs to the technical field of gas separation membrane technology separation. The MOFs / PIMs composite membrane is a homogeneous membrane and comprises a modified PIMs matrix and MOFs nanoparticles, the MOFs nanoparticles are uniformly embedded into the modified PIMs matrix, and the MOFs / PIMs composite membrane is formed by compounding a modified PIMs chain segment structure and a MOFs / PIMs cross-linked structure; the PIMs matrix in the composite membrane has continuous cavities, and the MOFs have regular pore channels. Firstly, a modified polymer PIMs is prepared; secondly, preparing an MOFs seed crystal solution; and finally, carrying out heat treatment on the PIMs / MOFs membrane casting solution through a solvent evaporation method to prepare the c-PIMs / MOFs composite membrane. On the basis of the concept of solvent volatilization, the gas separation performance and long-term stability of the PIMs composite membrane are improved by optimizing solvent volatilization conditions and regulating and controlling the interfacial compatibility between PIMs and MOFs; the interfacial compatibility between PIMs-MOFs can be improved, non-selective defects are avoided, and formation of a defect-free composite membrane is promoted; selective rapid transfer of gas can be achieved, and preparation of the evenly-distributed defect-free composite membrane is further achieved.

The application discloses a polymer electrolyte for a lithium metal battery and a preparation method and application thereof, and relates to the technical field of battery electrolyte materials. + The desolvation energy barrier at the electrode interface is reduced, the ionic conductivity of the electrolyte is significantly enhanced, and the lithium ion can be guided to form a stable solid electrolyte interface film in cooperation with the lithium ion, so that the uniform lithium ion flow is achieved, the uncontrollable growth of lithium dendrites is significantly inhibited, the side reaction consumption of the electrolyte in the cycle process is greatly reduced, and the long-period stability of the battery is effectively ensured, and the application is suitable for large-scale popularization and application in lithium metal batteries.

The present invention provides a positive electrode material with dual ion doping and wood ear derived carbon composite modification, and a preparation method and application thereof. The preparation method comprises the following steps: (1) adding NaF, KF, NH4H2PO4, NH4VO3, C4H6MnO4·4H2O and wood ear particles to water in sequence under stirring, and dispersing them evenly to obtain a mixed solution; (2) heating and stirring the mixed solution to obtain a gel state mixture; (3) freeze drying to obtain a freeze-dried gel; (4) grinding and then performing a first calcination; (5) grinding the first calcination product and then performing a second calcination. The positive electrode material with dual ion doping and wood ear derived carbon composite modification of the present invention is Na 3‑x K x V 2‑y Mn y (PO4)2F3@BF can effectively improve the structural stability and cycle stability of the positive electrode material, and the capacity retention rate can reach up to 102.86% after 200 cycles at a 0.2 C rate.

This invention discloses a large-area photo-chargeable aqueous zinc-ion battery, its preparation method, and its application. The method includes the following steps: Two pieces of glass with a transparent conductive layer coated on one side are taken. A positive electrode material is placed on the coated layer of one of the glass pieces. A glass fiber separator and a negative electrode material are sequentially covered on top of the positive electrode material. The other glass piece is then placed on top of the negative electrode material with its coated layer facing down. The positions of the two glass pieces are adjusted so that they are stacked alternately. Pressure is applied to the resulting stacked structure, and three sides are sealed with hot melt adhesive. After the hot melt adhesive has cured, electrolyte is injected into the unsealed side, and then this side is sealed again. The negative electrode of a diode is connected to the glass on the positive electrode side of the battery, and the positive electrode of the diode is connected to the glass on the negative electrode side of the battery, thus obtaining a large-area photo-chargeable aqueous zinc-ion battery. The battery of this invention has the advantages of high light utilization, stable charging, and low loss.

The present application relates to the technical field of gel electrolyte for supercapacitor, in particular to a gel electrolyte based on lysozyme amyloid fibers and application thereof. The ion conductivity of the conventional plant protein-based gel electrolyte is poor, and the electrical performance needs to be further improved. In view of the above problems, the present application provides a gel electrolyte based on lysozyme amyloid fibers. The lysozyme in the formula self-assembles into amyloid fibers under acidic conditions, and the surface of the amyloid fibers is rich in polar groups such as hydroxyl, carboxyl and amino groups, which can effectively promote the dissociation of lithium salt. At the same time, the three-dimensional network structure formed by the self-assembly of the fibers. Glycerol as a small molecule plasticizer inserts between the polymer chains. Lithium perchlorate and other lithium salts can provide high concentration of free lithium ions due to the large anion volume and low dissociation energy. The above components synergize and jointly act, effectively improving the comprehensive electrical performance of the gel electrolyte.

The present invention provides an electrolyte and a battery including the electrolyte. The electrolyte of the present invention includes a solvent, a lithium salt and an additive, wherein the additive includes an additive A, an additive B and an additive C; the additive A is selected from fluoroethylene carbonate, the additive B is selected from the silane borate compound shown in formula I, and the additive C is selected from the polycyclic ester compound shown in formula II. The electrolyte of the present invention forms an interface protective film having excellent thermal stability, high density, good flexibility, good mechanical strength and low impedance on the surface of the negative electrode through additives A, additive B and additive C. The protective film can effectively protect the electrode from side reactions with the electrolyte, and can also allow lithium ions to be freely deintercalated, thereby allowing the battery to have excellent normal temperature and high temperature cycle performance, high temperature storage performance and low temperature discharge performance.

The application provides a cation exchange membrane and a preparation method and application thereof, and belongs to the technical field of cation exchange membranes.The method provided by the application is free of volatile organic compounds, toxic and harmful monomers or heavy metal components, and the raw material itself is environmentally friendly.The method is free of harmful gas emission and hazardous waste generation, and is environmentally friendly.The cation exchange membrane material prepared by the method is chemically stable, easy to recycle after being discarded, free of additive precipitation during use, and free of pollution to the treatment system.The water-soluble dispersion bonding medium adopted by the application forms rich and uniform connected pore structures in the cation exchange membrane after being washed by water, greatly reduces ion migration resistance, significantly alleviates membrane polarization, and improves ion exchange rate and energy utilization efficiency when used for separation.The method provided by the application is free of complex chemical reactions, harsh process conditions, and standardized operation steps, and is easy to realize large-scale continuous production.

The invention provides a photolithography coated high-nickel ternary positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion battery positive electrode materials, and the preparation method comprises the following steps: carrying out wet spraying coating on LiNixCoyMn1-x-y-wZrwO2 matrix powder by using a conductive photoresist as a modifier to obtain a coated product, and under the protection condition of an oxygen atmosphere, carrying out wet spraying coating on LiNixCoyMn1-x-y-wZrwO2 matrix powder to obtain the high-nickel ternary positive electrode material. And sequentially carrying out exposure reaction, washing and developing treatment, drying, sieving and iron removal on the coated product by utilizing illumination or thermal radiation to obtain the conductive polymer coated high-nickel ternary positive electrode material. According to the invention, the advantages of good conductivity and stable structure of the conductive polymer are fully utilized, so that the problem of migration resistance of Li < + > on a material interface is reduced in the high-current charging and discharging process of the battery, and dissolution of metal particles on the surface of the material and surface side reaction are inhibited; the obtained high-nickel ternary positive electrode material crystal coated with the conductive polymer is high in first discharge efficiency, good in rate capability and cycle performance, and simple in process operation.

This invention relates to the field of battery technology, and in particular to a modified negative electrode, a full cell, and a preparation method thereof. The modified negative electrode includes a negative electrode and a ceramic layer coated on the surface of the negative electrode; the ceramic layer includes a fast ion conductor, ceramic particles, and a binder. The ceramic layer of this invention employs a composition of a fast ion conductor, hollow ceramic particles, and a binder. The hollow ceramic particles provide mechanical strength and buffer space, the fast ion conductor provides an ultrafast lithium-ion transport channel, and the composite ceramic layer, incorporating the fast ion conductor and ceramic particles, provides the core requirements for stable mechanical support, stress buffering, and ion conduction at the silicon-doped negative electrode interface. This significantly improves the effectiveness of reducing interface wrinkles on the negative electrode sheet after formation, maintaining the integrity of the electrode structure between the coating and the current collector, and the active material particles.

The invention relates to a modified graphite negative electrode material and a preparation method thereof, a negative electrode and a lithium ion battery. The modified graphite negative electrode material comprises graphite particles and an SEI precursor layer which is uniformly coated on the surface of each graphite particle and is constructed by lithium salt, wherein the lithium salt is of a crystalline state structure, and the thickness of the SEI precursor layer is 1-500 nm; during the first charging and discharging process of the battery, the lithium salt of the SEI precursor layer is subjected to electrochemical reaction prior to electrolyte, and an inorganic phase SEI with LiF and / or Li3PO4 as a main component is formed on the surface of graphite particles in situ. The negative electrode material disclosed by the invention realizes active formation and uniform distribution of SEI, even in a thick electrode, a continuous SEI layer can be formed on the surface of a deep graphite particle in the first charge-discharge and cycle process of a battery, the first-cycle coulombic efficiency is remarkably improved, the cycle life is remarkably prolonged, and the low-temperature and rate performance is improved; in addition, the electrolyte can more easily infiltrate the electrode, so that Li < + > is more smoothly transmitted in the thick electrode, and the electrochemical performance of the electrode is improved.

The invention discloses a recyclable valve-regulated lead-acid storage battery, lead paste and a preparation method of the lead paste, and relates to the field of lead-acid storage batteries. The lead paste comprises positive lead paste and negative lead paste which both contain short fibers compositely modified by carboxylic acid and silane monomers, and key components such as stannous oxide, zinc oxide, carbon black and lignin are added. The modified short fiber has the functions of acid affinity and storage, sulfuric acid conduction and structure enhancement, and has a synergistic effect with each component, so that the conductivity, the structural stability and the reaction activity of the lead plaster are remarkably improved, and the problems of reduced charging acceptance, quick capacity fading and short cycle life of the existing lead-calcium alloy storage battery are solved. The method is suitable for power cycle use scenes such as electric bicycles and electric tricycles, the cycle life of the storage battery can be prolonged, and the capacity stability is improved.

This application discloses a method for preparing a rare-earth composite solid electrolyte coating material, relating to the field of solid-state battery technology, comprising the following steps: Step 1, modifying solid high-purity, highly colloidal alumina powder with rare-earth-based precursor powder to obtain a modified mixture; Step 2, subjecting the modified mixture to sequential acidification and high-speed stirring dispersion to obtain a slurry; Step 3, adding LATP solid electrolyte powder to the slurry and mixing and beating to obtain a coating material; wherein the modified mixture is obtained through surface coating modification or doping modification. This application has the effect of enhancing the ion transport capability of the coating material in solid-state batteries and improving chemical and thermal stability.

The invention provides a conductive heating plate for a hair straightener and a preparation process of the conductive heating plate, and belongs to the technical field of conductive heating plate preparation. The preparation process comprises the following steps: preparing a graphene composite mixed solution; preparing the modified boron nitride doped with the three-dimensional structure; preparing a heat-conducting insulating layer; preparing a heat insulation layer; and preparing the conductive heating plate. The conductive heating plate is prepared from the ceramic substrate, the heat conduction insulating layer, the graphene composite heating layer, the conductive layer and the heat insulation insulating layer in sequence from bottom to top, and in the frequent heating and cooling circulation process of the hair straightener, the graphene composite heating layer can keep the performance unchanged; the heating effect is not affected by material aging or performance attenuation, the heat insulation layer serving as the outermost layer of the conductive heating plate can isolate heat generated by the heating body, and the heat is effectively prevented from being transmitted to a shell, a handle and other parts of the hair straightener.

This invention discloses a conductive network coating modified high-nickel ternary cathode material and its preparation method, belonging to the technical field of modified ternary materials. It comprises: a high-nickel ternary cathode material, an inner coating, and an outer coating; the chemical formula of the high-nickel ternary cathode material is LiNi. x Co y Mn 1‑x‑y O2, x=0.8~0.9, y=0.05~0.15; the inner coating is a lithium titanate coating, which coats the surface of the high-nickel ternary cathode material; the outer coating is a conductive polymer-conductive carbon composite coating, which coats the surface of the inner coating; the conductive polymer-conductive carbon composite coating consists of poly(3,4-ethylenedioxythiophene) and conductive carbon. The conductive network coating modified high-nickel ternary cathode material prepared by this invention has a high discharge specific capacity and good cycle stability.

The present invention relates to a composite current collector and a preparation method thereof, and a negative electrode-free lithium battery. The composite current collector includes a metal substrate and a first artificial SEI layer; the first artificial SEI layer includes a high entropy alloy layer and an oxide solid electrolyte layer stacked, the high entropy alloy layer includes a first high entropy alloy, and the oxide solid electrolyte layer includes a first oxide solid electrolyte; or, the first artificial SEI layer includes a mixed ion-electronic conductive layer of a second high entropy alloy and a second oxide solid electrolyte. The high entropy alloy can provide sufficient lithium-philic sites, induce the growth of lithium metal in the surface, and contribute to the dense deposition of lithium metal. The oxide solid electrolyte has excellent ion conductivity and can promote the rapid transport of lithium ions at the interface. The first artificial SEI layer helps to reduce the migration impedance of lithium ions at the interface, and promotes its uniform nucleation growth in the horizontal direction, thereby improving the cycle electrochemical performance of the battery.

This invention discloses a Prussian blue-graphite electrode sheet, its preparation method, and an assembled thermoelectric device. The Prussian blue-graphite electrode sheet comprises a graphite sheet and a Prussian blue deposition layer on the surface of the graphite sheet. The thermoelectric device comprises a first electrode layer, an ion-thermoelectric hydrogel layer, and a second electrode layer sequentially arranged, both of which are the Prussian blue-graphite electrode sheet of this invention. The Prussian blue-graphite electrode sheet of this invention can store energy and possesses a certain degree of flexibility. The thermoelectric device assembled with this electrode sheet and ion-thermoelectric hydrogel material has advantages such as thermal / electric charging capability, high thermoelectric conversion efficiency, large storage capacity, good flexibility, simple preparation process, low cost, safety, and environmental friendliness, making it suitable for large-scale production applications.

The invention discloses a preparation method of an efficient lithium ion battery electrolyte based on a novel polymer, and relates to the technical field of battery electrolytes.According to the polymer electrolyte, through reasonable molecular design and polymerization reaction, high ion conduction performance can be achieved, rapid transmission of lithium ions in a battery is ensured, and the service life of the battery is prolonged. According to the lithium ion battery, the migration resistance of ions in the transmission process is reduced, the ionic conductivity of the electrolyte is effectively improved, and the lithium ions can still rapidly and smoothly migrate between the positive electrode and the negative electrode in a low-temperature environment, so that the problem of discharge capacity attenuation caused by conductivity reduction is avoided, and the service life of the lithium ion battery is prolonged. According to the present invention, the lithium ion battery can maintain the high working efficiency under the extremely cold condition, and the diffusion resistance of the lithium ion in the electrolyte and the non-selective reaction of the lithium ion on the electrode surface are reduced by adding the various different functional additives so as to improve the cycle efficiency and the overall performance of the battery.

The invention belongs to the technical field of component transportation, and relates to a heavy and heavy bottomed component transportation device and method. The device comprises a sealing device, the sealing device comprises a rubber barrel skirt and a sealing skirt edge, the upper portion of the rubber barrel skirt is connected to the peripheral face of the lower portion of a component in a sleeving mode, the lower portion of the rubber barrel skirt abuts against a pedestal face, the outer ring of the sealing skirt edge is connected to the inner wall of the rubber barrel skirt, and the inner ring of the sealing skirt edge is connected with the pedestal face in a pressing mode; the inflating device comprises an inflating main pipe and a plurality of inflating branch pipes, the inflating branch pipes are buried in the pedestal, the extending direction of the inflating branch pipes is perpendicular to the moving direction, a plurality of inflating ports communicated with the inflating branch pipes are formed in the pedestal, one end of the inflating main pipe is connected with an air compression station, and the other end of the inflating main pipe is connected with all the inflating branch pipes; the air compression station is started, the bottom of the component is inflated through the inflation device until the component floats and forms an air chamber with the pedestal, and then the traction device is used for pulling the component to move. The problems that a traditional caisson migration mode is complex in pedestal area structure, high in foundation bearing capacity requirement, long in construction period, high in cost and the like can be solved.

This invention provides a battery negative electrode sheet and its preparation method. At least one surface of the current collector is provided with an active material layer comprising single-walled carbon nanotubes (SUVs) and silicon-carbon. Grooves are formed on the active material layer, and the depth of the grooves is related to the content of SUVs and silicon-carbon as follows: H = 0.236 × b / w; where H is the groove depth in μm, w% is the mass percentage of SUVs, and b% is the mass percentage of silicon-carbon. This invention forms a synergistic system of "silicon-carbon improving energy density + single-walled carbon nanotubes improving fast-charging performance + grooves mitigating silicon-carbon deformation." By quantitatively defining the relationship between the groove depth and the content of the two core components, the structural stability problem caused by the volume expansion of silicon-carbon materials is solved, and the contradiction between fast-charging performance and energy density brought about by the addition of SUVs is balanced, enabling the negative electrode sheet to simultaneously possess high energy density, excellent fast-charging performance, and long cycle life.

The invention relates to a battery cell and an electrochemical device and an electronic device comprising the same, and belongs to the technical field of electrochemical energy storage. The battery cell comprises an electrode assembly, and the electrode assembly comprises a straight area and corner areas located on the two sides of the straight area; the electrode assembly is formed by winding a positive pole piece, a diaphragm and a negative pole piece which are stacked; the diaphragm comprises a base membrane and coatings located on the surfaces of the two sides of the base membrane. The negative pole piece comprises a current collector and a negative active material layer; the surface density of a negative electrode active material layer in the negative electrode plate in the corner region is M1 g / m < 2 >, and the surface density of the negative electrode active material layer in the straight region is M2 g / m < 2 >; the surface density of the coating in the diaphragm in the corner area is M3g / m < 2 >, and the surface density of the coating in the straight area is M4g / m < 2 >; meanwhile, 0.5 < = M1 / M2 < = 0.9, 0.3 < = M3 / M4 < = 0.8, and 0.09 < = (M1 / M2)-(M3 / M4) < = 0.40. The battery cell can effectively inhibit lithium precipitation and improve the cycle performance of the battery.

The application provides a preparation method of a lithium manganese iron phosphate positive electrode material and the lithium manganese iron phosphate positive electrode material. The preparation method comprises the following steps: mixing a lithium manganese iron phosphate precursor and a COF-5 covalent organic framework material to obtain a first mixture, the COF-5 covalent organic framework material has a porous hole structure and contains carbon elements and active functional groups; and performing first sintering on the first mixture, so that the lithium manganese iron phosphate precursor is converted into a lithium manganese iron phosphate matrix, the COF-5 covalent organic framework material is carbonized to form a porous carbon coating layer, and thus the lithium manganese iron phosphate positive electrode material is obtained. The positive electrode material obtained by the preparation method has a uniform surface coated with a porous carbon layer formed by carbonization of COF-5, the coating layer retains an ordered porous structure, can improve the electronic conductivity and lithium ion diffusion capacity of the material, inhibits manganese dissolution and interface side reactions in high-temperature cycles, and improves particle dispersity and particle size consistency.

The invention discloses a lithium battery diaphragm and a preparation method thereof, the lithium battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises modified soybean meal activated carbon, an acrylate copolymer and a dispersant, a method for obtaining the modified soybean meal activated carbon comprises the following step: carrying out normal-temperature liquid phase modification on the soybean meal activated carbon by adopting a polyacrylamide-containing solution so as to graft polar groups on the surface of the soybean meal activated carbon, wherein the soybean meal activated carbon is carbonized soybean meal. And the modified soybean meal active carbon is beneficial to enhancing the liquid absorption, liquid retention and wettability of the diaphragm and ensuring more effective transmission of lithium ions, so that the performance of the lithium battery is improved.

The application discloses a step-by-step doped porous lithium iron manganese phosphate composite material and a preparation method thereof. 2+ The application discloses a step-by-step doped porous lithium iron manganese phosphate composite material and a preparation method thereof. 2+ The application discloses a step-by-step doped porous lithium iron manganese phosphate composite material and a preparation method thereof. 2+ The application discloses a step-by-step doped porous lithium iron manganese phosphate composite material and a preparation method thereof. 2+ The application discloses a step-by-step doped porous lithium iron manganese phosphate composite material and a preparation method thereof.

The application discloses a magnesium hydroxide-based high-safety lithium ion battery diaphragm and a preparation process thereof, and belongs to the technical field of lithium ion battery materials. The magnesium hydroxide-based high-safety lithium ion battery diaphragm comprises a polyolefin-based film and a composite functional coating attached to the surface of the polyolefin-based film. In the application, the surface of magnesium hydroxide is chemically grafted and modified by using a specific silane coupling agent, so that the interface compatibility between the inorganic filler and the organic matrix and the binder is obviously improved. The chemical bond formed by the hydrolysis product of silane and the hydroxyl group on the surface of magnesium hydroxide is used to introduce an organic molecular layer on the surface of the inorganic particles, effectively reduces the surface energy and inhibits the particle agglomeration, and thus the dispersion uniformity of the filler in the coating slurry is greatly improved.

The invention belongs to the technical field of food processing, and particularly relates to a method for improving the processing quality of dehydrated onions based on freezing and salting. According to the present invention, the onion is dehydrated by using the catalytic infrared combined hot air drying manner, and the fresh onion is subjected to the salting permeation synergistic freezing pretreatment before drying, that is, the fresh onion is subjected to the soaking treatment by using the low-concentration NaCl solution, and then is frozen for 18-24 h at the temperature of-25--18 DEG C. After the pretreatment, the subsequent drying time is substantially shortened, and the drying efficiency is substantially improved; the obtained dehydrated onions have little color change, the loss of flavones, aroma components and the like in the onions is greatly reduced, and the processing quality of the dehydrated onions is remarkably improved.

The invention discloses a positive plate which comprises a current collector and an active material layer attached to at least one surface of the current collector, and the active material layer comprises an additive A. In the pulping process of the positive plate, the diphosphoric acid compound is added, so that the stability of the positive electrode material under high voltage is improved, and the cycle performance of a battery cell is further improved.