18results about How to "Reduce migration resistance" patented technology

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.

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 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.

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.

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.

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.

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

The invention discloses a phosphate polyanion and nickel-based layered oxide composite positive electrode material and a preparation method and application thereof. The composite positive electrode material is obtained by ball-milling a nickel-based layered oxide positive electrode material or a Ti-doped nickel-based layered oxide positive electrode material and a phosphate polyanion positive electrode material or an F-doped phosphate polyanion positive electrode material according to a mass ratio of (1-5): (5-9), wherein the phosphate polyanion positive electrode material is selected from any one of NaFePO4, Na3V2 (PO4) 3, NaMnPO4, NaTi2 (PO4) 3 and Na4Fe3 (PO4) 2 (P2O7). The composite positive electrode material provided by the invention has high specific capacity, excellent cycling stability and good rate capability.