12results about How to "High ion conductivity" patented technology

The invention discloses a composite modification film, a lithium metal negative electrode and a preparation method of the lithium metal negative electrode. The composite modified film comprises an organic polymer solid electrolyte, an inorganic solid electrolyte and a film-forming agent, and the mass ratio of the organic polymer solid electrolyte to the inorganic solid electrolyte to the film-forming agent is (10%-35%): (10%-35%): (30%-80%). The composite modified film effectively buffers cyclic stress, prevents early mechanical failure of the protective layer, and realizes mechanical durability of the interface protective layer; the immobilized film-forming agent can be slowly released, so that the continuous and stable repair of SEI is realized, the dynamic repair capability of the whole life cycle is provided, and the efficient cycle life of the battery is greatly prolonged; and the electrolyte does not need to depend on a high-concentration liquid additive, dramatic change of electrolyte components in circulation is avoided, the overall chemical stability of the battery is improved, and the stability of an electrolyte system is guaranteed.

The application provides a high-nickel ternary material modification method and a high-nickel positive electrode material with a nitrogen-oxygen coating layer, and relates to the field of lithium ion batteries. In the high-nickel ternary material, surface lattice oxygen is gradually replaced by nitrogen atoms in a high-temperature long-time calcination process in a nitrogen-oxygen mixed atmosphere, so that a nitrogen-oxygen layer is formed on the surface, which is beneficial to the delocalization of electrons, thereby endowing the material with excellent electronic conductivity; meanwhile, the presence of the nitrogen-oxygen layer inhibits the transformation of the surface layer structure into a rock salt phase structure, which is beneficial to realizing efficient ion transport. The formation of the nitrogen-oxygen layer on the surface of the high-nickel ternary material can simultaneously improve the electronic and ionic conduction of the surface of the high-nickel positive electrode material, inhibit the interface side reaction, relieve the volume change, and thereby improve the cycle stability of the battery.

The application discloses a manganese iron lithium phosphate composite positive electrode material with Mn ion self-compensation and multiple interception functions and a preparation method thereof. The manganese iron lithium phosphate composite positive electrode material is composed of a manganese iron lithium phosphate positive electrode material and functional composite film micro-powder loaded on the surface and between the particles of the manganese iron lithium phosphate positive electrode material. The functional composite film of the functional composite film micro-powder is prepared from Na-merolite powder through Mn ion exchange, grafting and copolymerization, lithiumation and PVA composite film preparation. The manganese iron lithium phosphate composite positive electrode material is prepared from the manganese iron lithium phosphate positive electrode material and the functional composite film through mixing, crushing and freeze-drying. The manganese iron lithium phosphate composite positive electrode material realizes the inhibition of the dissolution of Mn 2+ in the manganese iron lithium phosphate positive electrode material from the source, improves the ion conduction performance and the cycle stability of the manganese iron lithium phosphate positive electrode material, and has the advantages of high capacity, long cycle life, high safety and the like.

The invention discloses a silicon negative electrode active material which sequentially comprises a silicon-based material inner core, a flexible solid electrolyte or gel electrolyte middle layer and a carbon-coated outer layer from inside to outside, the flexible solid electrolyte or gel electrolyte middle layer comprises a conductive agent, and the conductive agent comprises a carbon nanotube. According to the silicon negative electrode active material, the surface of the silicon-based material is coated with the flexible solid-state or gel-state electrolyte, so that the volume change of the negative electrode active material in the charging and discharging process is effectively relieved, the electrolyte is isolated, the stability of the negative electrode active material is improved, and the negative electrode active material has relatively high reversible specific capacity and relatively high specific surface area; and excellent long cycle performance is shown.

The application belongs to the technical field of hydrogen energy conversion by electrolysis of water, and particularly relates to a doped nickel oxide modified polysulfone composite diaphragm material and a preparation method thereof, which comprises uniformly dispersing polysulfone in N-methyl pyrrolidone to obtain a polysulfone solution, adding PVP or PEG to the polysulfone solution, stirring until complete dissolution to obtain a mixed solution, adding a doped nickel oxide material to the mixed solution, stirring until complete uniform dispersion to obtain a casting solution, degassing the casting solution by stirring, laying the casting solution on the front end of a doctor blade, sliding the doctor blade at a uniform speed to uniformly spread the casting solution on the surface of a glass film to obtain a liquid membrane, pre-evaporating the liquid membrane in air, immersing the pre-evaporated liquid membrane in deionized water to solidify into a film, peeling off the film and cleaning to obtain the doped nickel oxide modified polysulfone composite diaphragm material. By introducing the doped nickel oxide as a functional modification material, the hydrophilicity and conductivity of the diaphragm are effectively improved.

The application relates to the technical field of electrochemical energy storage, and discloses a low-negative-pressure sodium battery which comprises a negative electrode material, a positive electrode material, an electrolyte and a diaphragm, wherein the negative electrode material is hard carbon particles which are pre-lithiated and have a particle size of 5-10 mu m and are coated with a polyvinylidene fluoride-hexafluoropropylene functional layer; and a preparation method of the low-negative-pressure sodium battery is also disclosed, and the method comprises the following steps: S1, negative electrode material preparation: hard carbon particles and lithium metal sheets are mixed at a mass ratio of 1:0.4-0.6, and are heat-treated at 400-450 DEG C for 2-3 h. By adopting the pre-lithiated hard carbon negative electrode material, the stability of the battery under high-rate and long-cycle conditions is remarkably improved; by adopting the core-shell structure positive electrode material design, the structural stability and capacity retention rate of the battery in a high-temperature environment are enhanced; and by optimizing the electrolyte formula, the ion conductivity and decomposition resistance of the battery are improved.

This invention relates to an adhesive that can be used in lithium secondary batteries, particularly lithium-sulfur batteries, wherein the adhesive is manufactured via a reversible addition-fragmentation chain transfer (RAFT) polymerization reaction and has a structure comprising polymethyl methacrylate-derived blocks and polyacrylic acid-derived blocks centered on a thiocarbonyl sulfur functional group, and an aliphatic functional group at the outermost end. Therefore, it has the effect of improving the conductivity of the electrode using the adhesive and suppressing the dissolution of lithium polysulfides.

This invention belongs to the field of ion exchange membranes, and discloses an anion exchange membrane, its preparation method, and its application in flow batteries and hydrogen electrolyzers. The preparation method involves first copolymerizing tetraphenylethylene-vinyl monomers with styrene monomers via solution polymerization to obtain copolymer A; then, copolymer A undergoes a chloromethylation reaction to obtain copolymer B; finally, copolymer B reacts with trimethylamine to obtain polymer C. This polymer C can be used to fabricate anion exchange membrane using common polar, high-boiling-point solvents such as N,N-dimethylformamide via solution casting. This anion exchange membrane can be applied to flow batteries, improving coulombic efficiency and energy efficiency in vanadium redox flow battery systems and ensuring cycle stability; it is particularly suitable for use in AEM hydrogen electrolyzers, exhibiting excellent durability, high ionic conductivity, and mechanical properties.

This invention relates to the field of battery technology, specifically to a battery. The battery includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer includes a three-dimensional network framework and positive active material located within the three-dimensional network framework. The three-dimensional network framework is formed by a conductive binder, which includes carbon nanotubes and an adhesive layer. Along the thickness direction of the positive active material layer, the positive active material layer includes a first surface away from the positive current collector, and the conductive binder is distributed on the surface of the first surface. The separator includes a carrier layer and a coating layer. The coating layer adjacent to the first surface of the positive electrode is a first coating layer. The proportion W of the projected area of ​​the first coating layer on the surface of the carrier layer in the surface area of ​​the carrier layer is 5%-65%. The battery of this invention has high interfacial adhesion between the separator and the positive electrode, which can maintain good adhesion during cycling, improving the cycle performance of the battery.

This invention provides a method for preparing a low-expansion silicon-based anode sheet, a low-expansion silicon-based anode sheet, and a solid-state battery, to solve the problem of large volume expansion of anode sheets. The preparation method includes: weighing a polymer, dissolving the polymer completely in a solvent, adding a lithium salt to the solvent and dissolving it completely, and stirring for a first preset time; adding nano-silicon material and a conductive agent, stirring thoroughly to obtain a spinning solution, adding an initiator and stirring for a second preset time; loading the spinning solution into an electrospinning device, applying an electrospinning process, and preparing the spinning solution into nanofibers under preset voltage and distance conditions, and receiving them with copper foil to obtain a first silicon-based anode with a three-dimensional network structure; applying ultraviolet and / or thermal initiation processes to the first silicon-based anode to prepare a second silicon-based anode with a cross-linked three-dimensional structure; and rolling the prepared second silicon-based anode to a preset porosity to obtain a low-expansion silicon-based anode sheet.

The utility model provides a kind of electroreflective working electrode, the electrode includes substrate layer, the functional layer of metal material and the first stable layer of sulfide material, and first stable layer forms strong chemical bonding interface with functional layer by metal-sulfur bond. By constructing strong chemical bonding metal-sulfur bond, effectively solve the problem of weak interlayer adhesion, easy to peel off, significantly enhance the mechanical stability and interface integrity of electroreflective working electrode, thereby substantially prolong the service life and optical performance durability of electroreflective working electrode.

This invention relates to the field of battery technology, and in particular to a binder, its preparation method, a negative electrode, and a battery. The binder comprises catechol segments, crown ether segments, amino segments, and carboxylic acid segments. This invention provides a self-healing fast-charging negative electrode binder that improves the ion conductivity of the binder through the crown ether / heteroazo crown ether structure in the polymer; the catechol, amino, and carboxylic acid structures in the polymer endow the electrolyte with certain self-healing properties. Through the interaction of multiple groups, the binder can conduct ions quickly and improve electrode brittleness, thereby enhancing the battery's fast-charging capability and cycle life.