37results about How to "Dendrite suppression" patented technology

The invention specifically relates to an electrolyte for inhibiting lithium dendrites and a preparation method thereof, and a lithium battery, belonging to the technical field of lithium batteries. The electrolyte comprises a lithium salt, a nanometer additive, a dispersant and an organic solvent, wherein the concentration of the lithium salt is 0.5 to 10 mol/L, and the mass percent of the nanometer additive is 0.01 to 10%. The nonaqueous electrolyte prepared with fluoride-containing nanoparticles as the nanometer additive enables the battery to have better stability and security and longer service life; the fluoride-containing electrolyte has continuous and stable effect in the battery; compared with traditional film-forming nanometer additives, the fluoride-containing nanoparticles achieves the effect of on-site rapid film formation on the surface of a negative electrode, so the growth of lithium dendrites and side reactions on the surface of a positive electrode are effectively inhibited; moreover, the fluoride-containing nanoparticles stably exist in the electrolyte and is free of problems like decline in effect.

The invention discloses a method of improving center segregation quality of hypo-peritectic steel casting slabs, and belongs to the technical field of slab continuous casting. According to the method,two pairs of electromagnetic stirring rollers are arranged in a secondary cooling zone, and the two pairs of electromagnetic stirring rollers are installed at corresponding positions 3.5 to 8 m perpendicular distance from a crystallizer meniscus; the two pairs of electromagnetic stirring rollers are arranged in a three-ring manner; magnetic field directions generated by the electromagnetic stirring rollers are changed at intervals of 15 seconds; the current of the first pair of electromagnetic stirring rollers is 200 to 300 A, and the frequency is 2 to 4 Hz; the current of the second pair ofelectromagnetic stirring rollers is 300 to 400 A, and the frequency is 3 to 5 Hz; and meanwhile, the dynamic soft reduction technology is employed for processing nearby a solidification end point, thereduction interval of dynamic soft reduction is arranged at a position that the solid fraction of each casting slab is 10 % to 80 %, the reduction rate is 0.8 to 1.5 mm/m, and the total reduction amount is 4.0 to 5.5 mm. The method disclosed by the invention is capable of stably controlling center segregation of the hypo-peritectic steel casting slabs to be C 0.5 to C 1.5; hot charge rolling is realized on all the hypo-peritectic steel casting slabs; and tensile layering and rupturing of hot-rolled coils (plates) is eliminated.

A prepared method of semi-solid spherocrystal A-alloy is to treating the alloy fusant by the process of 'refining after metamorphism' or 'metamorphism after refining'; preparing the semi-solid by the reversible electromagnetic stirring; monitoring the temperature while stirring until the temperature is under the liquid phase 3-5 Deg C., then cooling and geting the product. The efficient of the process has been improved more greatly than the traditional one, and the alloy has been more available crystal nucleus.

The invention discloses an alkali metal composite negative electrode and a preparation method thereof and application of the alkali metal composite negative electrode in preparing a solid-state alkalimetal battery. The alkali metal composite negative electrode comprises a support layer and alkali metal loaded on the surface and the void of the support layer. The support layer is carbon cloth, 3Dporous graphene, a nickel mesh, a copper mesh or an aluminum mesh. The preparation of the solid-state alkali metal battery comprises the steps: placing the support layer in the molten alkali metal under the inert atmosphere, soaking it sufficiently and cooling so as to obtain the alkali metal composite negative electrode; a monomer containing unsaturated bonds, a ceramic electrolyte, a lithium salt and a selectively added functional additive are mixed with an organic solvent so as to obtain a solid-state electrolyte precursor; and assembling the alkali metal composite negative electrode, a positive electrode, a diaphragm and the solid-state electrolyte precursor to form a liquid battery and then adding an initiator and performing in-situ polymerization. The alkali metal composite negativeelectrode can effectively inhibit the formation of alkali metal dendrites and the interface reaction between the alkali metal and the electrolyte, and the prepared solid-state alkali metal battery hasbetter safety performance and comprehensive performance.

The invention belongs to the technical field of energy storage batteries and particularly relates to a dendrite-free and high-rate aluminum ion battery. The aluminum ion battery comprises an anode, acathode, electrolyte and an isolating membrane, wherein the isolating membrane is arranged between the anode and the cathode; and the cathode is a porous aluminum foil, an included angle between a pore channel direction of the porous aluminum foil and an aluminum ion transmission direction is gamma, and gamma is more than or equal to 0 and less than or equal to 90 degrees. Compared with the priorart, the problem that a dendrite is produced by taking a plane aluminum foil as a cathode of an aluminum ion battery under a large-current long cycle condition is effectively inhibited, and the cycling stability and rate capability of a device are effectively improved; and the technical problems of poor rate capability and cycling stability of the aluminum ion battery caused by the production of the dendrite in the prior art are solved.

The invention provides carbon cloth with uniformly distributed cobalt particles and grown with vertical graphene as well as a preparation method and application of the carbon cloth. The preparation method comprises the following steps of growing vertical graphene on carbon cloth through PECVD reaction to obtain first carbon cloth, respectively and uniformly dispersing 2-methylimidazole and cobalt nitrate in water to obtain a first solution, adding the first carbon cloth into the first solution, mixing and stirring, reacting for 4h to 5h to grow Co-MOF, cleaning and drying to obtain second carbon cloth, and carrying out annealing treatment on the second carbon cloth under the protection of argon to obtain the carbon cloth with uniformly distributed cobalt particles and grown with vertical graphene. A sodium ion total battery assembled by the carbon cloth with uniformly distributed cobalt particles and grown with vertical graphene can realize good electrochemical performance.

The invention discloses a nano-structure lithium battery electrolyte additive, a preparation method thereof and electrolyte. The nano-structure lithium battery electrolyte additive is a nano-structure lithium salt and comprises an inorganic rigid nuclear and an organic flexible villus-shaped side chain, and can be stably and uniformly dispersed in the electrolyte. The nano-structure lithium battery electrolyte additive provided by the invention can effectively increase a migration number of lithium ions of the electrolyte, can improve the high-low-temperature performance and safety of the electrolyte, and has significant effect for inhibiting dendritic crystals of a lithium ion battery and a metal lithium battery when in low-temperature fast charging.

The invention discloses a polymer electrolyte and a preparation method and application thereof. The polymer electrolyte comprises a polymer matrix, the polymer matrix is a polymer formed by self-polymerization of a polymeric monomer composed of three building blocks of acryloyl, carbamate and phosphate, or a polymer formed by copolymerizing a polymeric monomer and other monomers, wherein the polymeric monomer is composed of three building blocks, namely acryloyl, carbamate and phosphate. The polymer electrolyte can be used in a battery, the polymer matrix can be subjected to a self-crosslinking reaction at a high temperature of 130-190 DEG C to generate a compact thermosetting polymer which can cut off ion transmission and prevent thermal runaway of the battery; the self-crosslinking reaction is an endothermic reaction, so that the temperature of the battery can be quickly reduced, and the thermal runaway of the battery can be prevented; the polymer electrolyte can capture free radicals and has intrinsic flame retardance; and the characteristics of the polymer matrix are synergistic, so that the thermal runaway of the battery can be effectively prevented.

The invention belongs to the technical field of electrochemical power supplies, and particularly relates to a method for synthesizing a porphyrin-based two-dimensional metal organic framework (MOF) nanosheet array on a zinc substrate, which at least comprises the following steps: 1, preparing a solution: dispersing a precursor of a porphyrin structure containing carboxyl in a mixed solvent to obtain a precursor solution; 2, the precursor solution and a zinc substrate are subjected to a reaction, and a porphyrin-based two-dimensional Zn-MOF array is obtained; and step 3, washing the porphyrin-based two-dimensional Zn-MOF array obtained in the step 2 with a solvent, and then removing the solvent, so that the porphyrin-based two-dimensional MOF nanosheet array is attached to the zinc substrate. The MOF open-pore array structure is efficiently synthesized through a surfactant-free substrate induction method, and the MOF open-pore array structure is used for the negative electrode of the metal ion battery, so that U-shaped deposition of metal can be induced, generation of dendritic crystals can be inhibited, and the cycle performance of the metal ion battery is improved. Meanwhile, the MOF nano array is simple to synthesize and suitable for large-scale production.

The invention discloses a zinc battery negative electrode protected by a hydrophobic layer, a preparation method and a battery, and belongs to the technical field of electrochemistry. The method is characterized in that a layer of titanate and hydrophobic binder mixture is arranged on the surface of the zinc battery negative electrode active material to form a zinc negative electrode protection layer, the protection layer has certain hydrophobicity, is stable in structure, can effectively inhibit hydrogen evolution of a zinc negative electrode and can inhibit zinc dendrites, and therefore, the zinc negative electrode provided with the hydrophobic protective layer and the battery adopting the negative electrode can remarkably improve the charge-discharge cycle performance.

The invention relates to a tubular nanofiber material which is characterized in that a tubular nanofiber is provided with a hollow pipeline, and the hollow pipeline extends in the axial direction of a nanofiber pipe; a lithium-loving material is distributed on the tube wall of the tubular nanofiber; the two ends of the tubular nanofiber are of closed structures. The invention also relates to a negative pole piece containing the tubular nanofiber material, an electrochemical device and an electronic device.

The invention provides a solid electrolyte, and a lithium metal anode and a preparation method thereof. The solid electrolyte is a composite polymer electrolyte formed by compounding lithium lanthanumtitanium oxide and linear polyurethane. The preparation method comprises the following steps: firstly, preparing lithium lanthanum titanium oxide particles with a complete crystalline phase through aprocess of combining hydrothermal synthesis and high-temperature calcination; and then, blending and stirring the lithium lanthanum titanium oxide particles and linear polyurethane, and carrying outsolvent evaporation treatment to prepare the solid electrolyte. The lithium ion conductivity of the solid electrolyte prepared by the method at room temperature reaches 3.8*10<4>Scm<1>. Meanwhile, thebattery assembled by the solid electrolyte shows excellent cycle performance and excellent specific capacity at room temperature. The lithium metal anode can be obtained by compounding the solid electrolyte and a lithium metal sheet.

The invention discloses an electrode treated by persulfate and application of the electrode in a zinc-iron flow battery, an electrode material is soaked in an aqueous solution of persulfate for treatment, and compared with an original untreated electrode material, the electrode material has higher electrode activity, the conductivity of the battery can be effectively improved, and the cycle performance and the efficiency of the battery are improved; meanwhile, the charge-discharge capacity and the energy density of the battery are greatly improved.

A separator for electricity storage devices according to the present invention comprises an active layer that contains an Li-absorbing material; and the active layer has an electrical resistivity in the plane direction of 100,000 Omega cm or more and an air permeability of 650 s or less.