15results about How to "Improved high-magnification performance" patented technology

The invention discloses a lithium iron phosphate positive electrode material rich in oxygen vacancies and a preparation method and application thereof.The preparation method of the lithium iron phosphate positive electrode material rich in oxygen vacancies has the advantages that the number of heating times can be set in a programmable mode, the heating and cooling speed is high, and the heat treatment time is short; the volatilization amount of the lithium salt is small, and the method is more economical and environment-friendly; according to the method, a programmable constant-current power supply is used for electrifying and heating the carbon-based Joule thermal material, and the carbon-based material is used as a heating stage to realize ultrafast synthesis of the lithium iron phosphate material through a physical contact heat transfer effect; and the oxygen vacancy content can be adjusted by regulating and controlling parameters such as temperature and time. The heat treatment is performed in a specific atmosphere (such as vacuum, inert gas, reducing gas and oxidizing atmosphere), so that the reoxidation of the oxygen vacancies can be reduced, and the formation and the stabilization of the oxygen vacancies are facilitated; the adjustable and controllable range of the oxygen vacancy concentration in the lithium iron phosphate material prepared by the preparation method disclosed by the invention is 2.198 E12 to 7.382 E13Spins / mm < 3 >.

The invention discloses a preparation method of a lithium manganese iron phosphate battery positive electrode material, and belongs to the technical field of battery positive electrode material preparation. The preparation method of the lithium manganese iron phosphate battery positive electrode material comprises the following steps: (1) adding a lithium source, a manganese source, an iron source, a phosphate radical source and polyacrylonitrile into a container, then adding N, N-dimethylformamide as a solvent, stirring under a water bath heating condition to obtain a spinning solution, stirring and mixing the spinning solution with a composite organic matter, and then, carrying out ultrasonic treatment to obtain a precursor solution; carrying out ultrasonic treatment, and then carrying out electrostatic spinning to obtain a positive electrode material precursor; (2) after aging the positive electrode material precursor, transferring the positive electrode material precursor into a tubular furnace for heat treatment to obtain a carbonized positive electrode material; and (3) carrying out ball-milling mixing on the composite carbon nanotube and the carbonized positive electrode material, and pressing to obtain the lithium manganese iron phosphate battery positive electrode material. The positive electrode material prepared by the method has excellent cycle performance, structural stability and rate capability.

The invention discloses a carbon-coated oxygen-vacancy-enriched hollow sphere H-CeO2-coated C-NC composite material and a preparation method and application thereof.The method comprises the steps that 1, polyvinylpyrrolidone is dissolved in an ethanol solution, CeCl3. 7H2O is added, Cu2O is added after the CeCl3. 7H2O is dissolved, stirring is conducted at the room temperature, and a brick-red solution is obtained; step 2, dropwise adding a sodium thiosulfate solution into the brick red solution to obtain a faint yellow solution, stirring at room temperature, and then sequentially standing, aging, centrifuging, washing and vacuum drying to obtain light yellow hollow CeO2 powder; step 3, respectively taking the hollow CeO2 powder and dopamine hydrochloride, adding into a Tris buffer solution, uniformly stirring, and sequentially centrifuging, washing and vacuum drying to obtain a CeO2 composite material CeO2 (at) PDA coated with polydopamine; and step 4, placing the CeO2 (at) PDA in a tubular furnace, and performing high-temperature carbonization treatment in an argon atmosphere to obtain the carbon-coated oxygen-vacancy-rich hollow sphere H-CeO2 (at) C-NC composite material which can endow the Li-S battery with excellent rate capability and good long cycle stability.

This invention discloses an O3-phase high-entropy layered oxide cathode material, its preparation method, and its application, belonging to the technical field of sodium-ion battery cathode materials. The O3-phase high-entropy layered oxide cathode material has the chemical formula NaNi. 1‑ 8x Ca x Co x Al x Fe x Mn x Si x Ti x Zr x O2, x = 0.05~0.1. Raw materials are weighed according to stoichiometric ratio, mixed, and pulverized to obtain precursor powder. The precursor powder is then sintered in a pure oxygen atmosphere to obtain a first sintered product, which is then pulverized again. The pulverized product is then sintered in a pure oxygen atmosphere for a second step, and after cooling, an O3 phase high-entropy layered oxide cathode material is obtained. Sodium-ion batteries assembled based on this cathode material exhibit excellent high-rate performance and long-cycle stability.

The application discloses a kind of quasi-solid electrolyte and preparation method thereof, battery, electrical device, electrolyte salt is mixed with carbonate solvent, and preparation base electrolyte solution;Diluent and initiator are added to base electrolyte solution and are reacted, and quasi-solid electrolyte is prepared;The diluent includes ring-opening polymerizable cyclic monomer diluent, and the mass ratio of the diluent, the initiator and the base electrolyte solution is (30-70) : (0.1-0.5) : (30-70) in turn.The precursor solution containing local high concentration solvation structure is formed in the preparation process of quasi-solid electrolyte of the application, and quasi-solid electrolyte with low impedance, high ionic conductivity, excellent high rate performance and good safety performance is prepared using in-situ polymerization technology.The quasi-solid electrolyte prepared by the application is assembled into battery, with excellent charge-discharge performance, excellent cycle stability under high rate conditions, and low economic cost and high practicality.

The invention provides a self-healing positive electrode material, a secondary battery and a preparation method, and relates to the technical field of batteries. The self-healing positive electrode material comprises a positive electrode material substrate and a self-healing polymer film coated on the surface of the positive electrode material substrate. The polymer film is composed of a polymer, a lithium salt and a conductive material, can repair damage caused by charging and discharging in the use process of a battery, prolongs the service life of the battery, improves the cycle stability of the battery, and has a good self-healing characteristic. In addition, through compounding with the lithium salt and the conductive material, the film layer has efficient lithium ion conductivity and electronic conductivity.

This invention provides a battery anode composite material, its preparation method, and its application. The preparation method includes: mixing a bismuth salt, a first metal salt, a carbon source, a template agent, and deionized water to obtain a mixed solution, wherein the first metal is selected from copper, silver, iron, zinc, gold, molybdenum, tungsten, titanium, and vanadium; spray-drying the mixed solution to obtain a precursor; removing the template agent from the precursor; and sintering at high temperature in a protective atmosphere to obtain a bismuth-first metal-carbon composite material or a bismuth-first metal oxide-carbon composite material. The composite material prepared by this invention can significantly alleviate the volume expansion problem of bismuth-based materials during charge and discharge, maintain the structural integrity of the electrode material, prevent the aggregation of bismuth nanoparticles, and thus improve the cycle stability of the anode material.

A vacancy composite diaphragm and its preparation method, application and lithium-based liquid battery based thereon, as well as a solid-state battery. The present invention belongs to the field of lithium battery diaphragms. The present invention is to solve the technical problems that the existing lithium-based batteries cannot achieve the simultaneous improvement of lithium ion conductivity and lithium ion migration number, and the existing modification method using ceramic particles directly coated or as fillers leads to diaphragm pore blockage, which is not conducive to the high rate performance and long cycle stability of lithium ion batteries. The present invention adds Te-rich vacancy particles to the diaphragm substrate to obtain a vacancy composite diaphragm with uniform pore size, precisely controllable thickness, high lithium ion conductivity, high lithium ion migration number, good electrolyte absorption rate and good wettability. The introduction of Te-rich vacancy particles effectively limits the migration of anions in the electrolyte, greatly improves the migration ability of lithium ions, and can also homogenize lithium ion deposition, inhibit the growth of lithium dendrites, and improve the rate performance and cycle stability of lithium batteries.

The application relates to a structure charge synergistically regulated sodium iron fluorophosphate positive electrode material and a preparation method thereof, and relates to a sodium ion battery positive electrode material and a preparation method. 1‑x‑ y V x Ti y PO4F@C, wherein 0.01 <= x <= 0.05, 0.01 <= y <= 0.05, and x+y < 0.1; C represents a carbon coating layer. The preparation method is as follows: after wet grinding, drying and sintering of raw materials for preparing sodium iron fluorophosphate, the raw materials are ball milled with a carbon source, and then sintered to obtain the sodium iron fluorophosphate. 0.95 V 0.03 Ti 0.02 The specific discharge capacity of the PO4F@C at 0.2C is 116.9 mAh / g, and the capacity retention rate is 94.0% after 100 cycles. The material can be used in the field of sodium ion batteries.

The invention belongs to the field of new energy storage materials, and particularly discloses a preparation method of a gradient asymmetric hydrogel electrolyte, which is characterized in that the gradient asymmetric hydrogel electrolyte is prepared by regulating the concentration of electrolyte salt as a main time factor and cooperating with the fine adjustment effect of a nano inorganic filler and the space factor of gravity settling. And rapidly preparing the organic-inorganic composite hydrogel electrolyte with a gradient structure at room temperature. The method has universality, can be adapted to various inorganic fillers, and finally forms a gradient structure of negative electrode side filler enrichment layer-middle transition layer-positive electrode side polymer network layer by adjusting the salt concentration to match the sedimentation behaviors of different fillers. The electrolyte can simultaneously realize negative electrode interface stability, positive electrode ion rapid transmission and mechanical property enhancement, and shows excellent cycling stability and capacity retention ratio in a symmetric battery and a total battery. The preparation method is simple, low in energy consumption, high in controllability and suitable for large-scale energy storage and flexible electronic equipment.

The invention relates to the technical field of chemical batteries, in particular to an aluminum ethoxide composite polymer electrolyte membrane, a preparation method of the aluminum ethoxide composite polymer electrolyte membrane, application of the aluminum ethoxide composite polymer electrolyte membrane in a battery and an assembly process of the battery. The aluminum ethoxide composite polymer electrolyte membrane comprises a polymer and aluminum ethoxide, the structure of the polymer contains ester groups or / and ether bonds; the polymer is polyethylene oxide or a polyethylene oxide derivative; the polyethylene oxide derivative is obtained by carrying out photopolymerization on a small molecular monomer. When the aluminum ethoxide composite polymer electrolyte membrane is applied to a battery, the interfacial compatibility is enhanced, rapid and ordered transmission can be realized, and the cycling stability is good.

The invention discloses a rapid preparation method and application of a sulfur-host lithium-sulfur battery positive electrode material, which belongs to the technical field of lithium-sulfur battery positive electrode material preparation. The invention first uses the metal organic framework material ZIF‑8 as a template, undergoes Joule heat treatment, and rapidly synthesizes a porous carbon material, then impregnates a manganese salt in an ethanol solution, reacts with thioacetamide through a Joule heat-driven solid phase reaction, and controls the heating and cooling atmosphere to rapidly prepare a sulfur-host lithium-sulfur battery positive electrode material. The Mn3O4 / MnS heterostructure in the sulfur-host lithium-sulfur battery positive electrode material creates an interface with high activity, which can enhance the chemical adsorption of polysulfides and their catalytic conversion, thereby significantly promoting the kinetic process of sulfur redox reactions and improving the overall performance of lithium-sulfur batteries.

The invention discloses a novel nitrile gel electrolyte and application thereof, and belongs to the technical field of lithium metal batteries. The electrolyte comprises LiTFSI, a DENE / DME plasticizer (the volume ratio is 1: (0-1)), a DOL solvent (the volume ratio to the plasticizer is 1: 1), a film-forming additive (1-20 wt%) and an initiator (1-10 mM). The DENE wraps lithium ions through a four-tooth chelating structure, the migration path is optimized, and the ion migration number is increased to be close to 0.6 (the contrast ratio is only 0.34). The electrolyte has both high mechanical strength and ionic conductivity, the assembled lithium-sulfur battery circulates for 230 circles at the rate of 2 C, the proportional capacity is improved by more than 150 mAh / g compared with the contrast, the capacity retention ratio is greater than 99%, and the nucleation overpotential of the lithium-copper battery is reduced by 60%.

The invention relates to hollow sea urchin carbon based on concentrated gel carbonization and a preparation method and application of the hollow sea urchin carbon based on concentrated gel carbonization, zinc salt conversion and macromolecular precursor carbonization are synchronously carried out based on a zinc salt concentrated gel carbonization strategy, and an ordered hollow sea urchin carbon structure is prepared. The ordered hollow sea urchin carbon structure is further processed into an electrode plate for a supercapacitor, and the electrode plate has optimized high-rate performance. The method disclosed by the invention does not need a complicated synthesis process and expensive instruments and equipment; the prepared hollow sea urchin carbon structure is uniformly dispersed, so that effective permeation of an electrolyte under a high-load condition is facilitated; zinc salt conversion is beneficial to formation of a spatial multi-layer structure, and complex activation is avoided; the high-rate capacitor carbon material has high-rate performance after being assembled into an electrode material, and the method is wide in application range, has relatively high reference value for developing a uniform high-rate capacitor carbon material with a spatial structure, and is suitable for popularization and application.

The invention belongs to the technical field of battery energy storage, and provides a hydrogen solid-state secondary battery with a vanadium-based positive electrode. The hydrogen solid-state secondary battery with the vanadium-based positive electrode comprises a vanadium-based compound positive electrode, a Pt / C negative electrode and a solid-state electrolyte, the solid electrolyte comprises an acidic electrolyte and clay; the vanadium-based compound positive electrode comprises one of a Li3V2 (PO4) 3 positive electrode, a LiV3O8 positive electrode and a LiVOPO4 positive electrode. The vanadium-based compound positive electrode is applied to a system of the novel hydrogen solid-state secondary battery, so that the battery has excellent cycling stability, rate capability and low-temperature performance and is wide in application range; in addition, the preparation method of the vanadium-based compound positive electrode is simple, low in energy consumption, low in cost, free of resource limitation, environmentally friendly and easy to realize industrialization.