5results about How to "Stable cycle life" patented technology

This invention belongs to the field of sodium-ion batteries, and relates to a fluorophenylphosphonate, its preparation method, and its application in sodium-ion batteries. The fluorophenylphosphonate includes di(trifluoroisopropyl)phenylphosphonate or di(hexafluoroisopropyl)phenylphosphonate; the preparation steps are as follows: using fluoroalcohol and phenylphosphonyl dichloride as raw materials, triethylamine as an acid-binding agent, and diethyl ether as a reaction solvent, the fluorophenylphosphonate is prepared by a condensation substitution reaction. Sodium-ion batteries prepared using fluorophenylphosphonate exhibit high ionic conductivity and an electrochemical stability window. This phosphonate additive preferentially decomposes at the electrode interface, inducing the formation of a thin, dense, uniform electrode-electrolyte interface phase rich in NaF inorganic components, and giving the electrolyte excellent flame-retardant properties. Sodium-ion batteries assembled with positive electrode materials exhibit good rate performance and cycle stability, with a cycle life exceeding 5000 cycles at room temperature. Simultaneously, this electrolyte also exhibits excellent cycle performance at a high temperature of 60°C.

A fiber-reinforced lithium borohydride-based all-solid-state electrolyte for suppressing dendrite formation, its preparation method, and its application are disclosed. The method employs a reverse micelle precipitation method to prepare a precursor solution by dissolving lithium borohydride and lithium iodide in an ether solvent solution. Aluminum oxalate and vapor-grown carbon fibers are then added, followed by dropwise addition to an isopentane solution containing a surfactant. After reverse micelles form, the solution is allowed to settle and react completely, and the solvent is thoroughly removed. The product from the settled reaction is dried and then subjected to partial hydrogen release treatment. The partially hydrogen-released product is dispersed in a benzene solution containing polymethyl methacrylate, freeze-dried, and then melt-reacted in situ in a universal mold. This process is simple and highly controllable, significantly improving the mechanical stability and dendrite resistance of the lithium borohydride-based all-solid-state electrolyte, and enabling long lifespan of all-solid-state lithium batteries under fast-charging conditions, thus facilitating commercial applications.

The application relates to the technical field of batteries, in particular to a positive electrode material precursor, a positive electrode material, a positive electrode sheet, a battery and an electric device, the specific surface area of the positive electrode material precursor is a m 2 / g; the Dvmin of the positive electrode material precursor is b mu m; the reciprocal of the aspect ratio of the positive electrode material precursor is c; the positive electrode material precursor satisfies: 5<=a / b x c<=500; the positive electrode material precursor comprises at least one of a nickel-cobalt-manganese ternary material precursor, a nickel-cobalt-aluminum ternary material precursor and a nickel-cobalt-manganese-aluminum quaternary material precursor. Compared with the prior art, the related parameters of the positive electrode material precursor are comprehensively regulated, the positive electrode material precursor has high-dispersed single-crystal structure characteristics, excellent lithium extraction uniformity requirements are met, and on the basis of guaranteeing that the battery has good cycle stability, the battery electrical performance is improved.

This invention discloses a lithium-rich manganese-based layered oxide composite cathode material and its preparation method, belonging to the field of lithium-ion battery technology. The method includes: adding water to a nickel source, a cobalt source, and a manganese source to obtain a mixed solution; adding sodium carbonate solution to adjust the pH; washing with deionized water and centrifuging; drying; mixing with lithium salt; and pre-calcining to obtain Li. 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 1.8 F 0.2 The material was then subjected to a process involving the sequential addition of a carbon source and an organic solvent. The resulting mixture was heated under a mixed atmosphere to obtain a lithium-rich manganese-based basal oxide material. Na₂WO₄ and pyrrole were then added, and the mixture was dissolved in deionized water to obtain a composite cathode material, Li. 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 1.8 F 0.2 @N,S-C@Na2WO4@PPy. The composite cathode material of this invention has uniform particles, stable structure, and exhibits considerable wide potential window reversible capacity, excellent rate performance, and stable cycle life.

The application discloses a kind of bionic ligament structure interpenetrating network hydrogel electrolyte and preparation and application thereof.The electrolyte is formed by the double chemical-physical crosslinking of polymerizable acrylic acid protonated chitosan ionic liquid, acrylamide and TEMPO oxidized cellulose nanofiber, forming rigid-flexible synergistic interpenetrating network structure, simulating the mechanical and functional properties of human ligament.The hydrogel has excellent mechanical properties and high efficient ion conduction capacity.Its rich functional groups can regulate Zn 2+ solvated structure, uniform ion flux, inhibit dendrite growth and side reaction.Zinc symmetric battery using the hydrogel electrolyte can realize more than 2400h of super-long cycle life, and the average coulombic efficiency of zinc-copper battery reaches 99.3% in 1300 cycles, the capacity retention rate of zinc-manganese dioxide full battery reaches 80% after 1000 cycles, and the flexible soft pack battery still maintains stable output under different bending states.The application provides a new electrolyte material system for high-performance, long-life flexible zinc ion battery.