9results 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 >.

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.

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 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%.