9results about How to "Improve high pressure stability" 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 a preparation method of a step-by-step polymerization double-enhanced interface solid polymer electrolyte, which comprises the following steps: mixing a matrix monomer and a first photoinitiator to obtain mixed slurry, and illuminating to obtain prepolymerized slurry; adding a lithium salt and a second photoinitiator into the pre-polymerized slurry, mixing to obtain polymer slurry, dividing the polymer slurry into first polymer slurry and second polymer slurry, adding a nitrogen-containing functional monomer into the first polymer slurry to obtain polymer slurry A, and adding a fluorine-containing functional monomer into the second polymer slurry to obtain polymer slurry B; and pouring the polymer slurry A on the first surface of the base membrane, treating the first surface, pouring the polymer slurry B on the second surface of the base membrane, and treating the second surface of the base membrane to obtain the step-by-step polymerization double-enhanced interface solid polymer electrolyte. The solid polymer electrolyte is prepared by adopting a step-by-step polymerization method, a positive electrode side interface and a negative electrode side interface are optimized, and continuous large-scale production of the solid polymer electrolyte is realized.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly discloses a composite positive electrode material of a solid electrolyte epitaxial coating, which comprises an inner-layer positive electrode active material and an epitaxial layer coated outside the inner-layer positive electrode active material, the inner-layer positive electrode active material is a configuration entropy ultrahigh nickel positive electrode material, and the general formula of the configuration entropy ultrahigh nickel positive electrode material is LiNi < x > Co < y > M < 1-x-y > O < 2 >. The disorder degree and inherent strain of the positive electrode material can be relieved through the chloride solid electrolyte epitaxial coating, the consistency and interface compatibility between an electrode and an electrolyte are enhanced, the electrochemical performance of the configuration entropy ultrahigh nickel positive electrode material LiNi < x > Co < y > Mn < 1-x-y > O < 2 > is improved, and therefore the composite positive electrode material with high stability and long service life is constructed.

The invention discloses a lithium ion halide solid electrolyte material as well as a preparation method and application thereof. The chemical general formula of a halide solid electrolyte is Li < x > MC < 4-y > F < x + y >, wherein 0 < x < = 2; x is greater than or equal to-x and less than or equal to y, and M is selected from one or two of transition metal elements Hf and Zr. The invention discloses a preparation method of a lithium ion halide solid electrolyte material. The halide solid electrolyte is used for preparing a solid electrolyte or a composite positive electrode of a lithium ion all-solid-state battery. By introducing F, on one hand, non-crystallization of the electrolyte is promoted, which is a reason for remarkably improving the conductivity of the electrolyte, and on the other hand, as the electronegativity of F is large, the high-voltage stability of the electrolyte is enhanced, so that the lithium ion halide solid electrolyte provided by the invention can be used for improving the conductivity of the electrolyte. And in a solid-state battery system, the material has relatively high ion conduction capability and good high-voltage stability and mechanical stability.

The present invention relates to an electrolyte, a lithium ion battery and an electrical device. The electrolyte comprises a lithium salt, a solvent and a diluent; wherein the solvent comprises a compound having a general structural formula as shown in formula (I): wherein R1 and R2 are independently selected from nitrogen-containing groups, substituted or unsubstituted C1-C 12 The electrolyte provided by the present application improves the high-voltage resistance and thermal stability of a single dicarbonate solvent without adding additional additives or increasing the concentration of lithium salts, and the electrolyte has good interfacial compatibility, low viscosity, and good wettability, which is conducive to the transmission and migration of ions, thereby improving the electrochemical performance of lithium-ion batteries.

The invention relates to the field of batteries, and particularly discloses a single-ion conductor solid-state electrolyte, a preparation method thereof and a solid-state battery, the solid-state electrolyte comprises a single-ion conductor polymer and a cyano-group-containing covalent organic framework filler; the single ion conductor polymer contains sulfonic acid alkali metal salt groups and / or fluorine groups. According to the solid electrolyte, anions are anchored in a polymer framework of a single-ion conductor polymer to limit movement of the anions, only lithium ions are conducted in the solid electrolyte in the charging and discharging process, the transference number of the lithium ions is close to 1, and concentration polarization and dendritic crystal growth on the surface of a lithium negative electrode can be effectively inhibited. Besides, the cyano-containing covalent organic framework filler is rich in electron-withdrawing cyano groups, and the cyano-containing covalent organic framework filler can promote dissociation of lithium ions from a polymer skeleton through strong ion-dipole interaction with the lithium ions, so that the ionic conductivity is effectively improved, and the ionic conductivity reaches about 1mS cm <-1 >.

The application discloses a cold-resistant high-voltage cable and a preparation method thereof, and relates to the technical field of polyolefin cables. The cold-resistant high-voltage cable comprises the following steps: step 1, uniformly mixing high-density polyethylene, linear low-density polyethylene, maleic anhydride grafted POE, hydrogenated styrene-butadiene-styrene block copolymer, a crosslinking agent, an antioxidant and a lubricant, and high-temperature stirring to obtain premix; step 2, melt extruding the premix, wherein the melt extrusion process comprises six temperature zones, and high-pressure modified fibers are added in the fourth temperature zone, and then cooling and forming to obtain a cold-resistant high-voltage outer sheath; and step 3, sequentially coating a cable core with the outer sheath, a shielding layer and an insulation layer to obtain the cold-resistant high-voltage cable. The outer sheath of the cold-resistant high-voltage cable prepared in the application has good cold resistance and high-voltage stability, so that cracks of the outer sheath are avoided, and the use of the cable is affected.

The invention discloses a low-cost electrolyte for a high-voltage sodium-ion battery, the electrolyte comprises an organic solvent, a solute and additives, the organic solvent adopts a pure linear carbonic ester solvent, the solute adopts sodium hexafluorophosphate, and the additives comprise a film-forming additive, a flame-retardant additive and an overcharge protection additive; compared with the prior art, the electrolyte has the advantages that the electrolyte adopting the pure linear carbonic ester solvent and sodium hexafluorophosphate as a sodium source is applied to sodium metal, and when the electrolyte is applied to a P2-phase material, the electrolyte can stably work at 4.5 V and exert high capacity, and the electrolyte has high and good high-voltage stability along with the increase of the chain length. Wherein the circulation retention rate of DEC can be maintained at 94.94% at 4.5 V, 2C and 300 circles. Therefore, the high-pressure stability can be remarkably improved by increasing the chain length of the linear ester.

This invention belongs to the field of electrochemical technology and relates to a high-voltage resistant composite positive electrode sheet and its preparation method for suppressing gas generation during battery cycling. The composite positive electrode sheet includes a positive electrode sheet and a polymer coating on the active material layer of the positive electrode sheet. The polymer coating is a composite polymer coating formed by in-situ copolymerization of phosphorus-containing monomers and fluorinated acrylate monomers in the presence of polyethylene glycol borate under ultraviolet light. The mass ratio of the phosphorus-containing monomers, fluorinated acrylate monomers, and polyethylene glycol borate is (3~4):1:(0.15~0.4). The composite positive electrode sheet of this invention can suppress gas generation during battery cycling and improve its high-voltage resistance (≥4.3V vs Li). + / Li) stability.