37results about How to "Dendrite suppression" patented technology

The invention discloses a polymer electrolyte and a preparation method and application thereof, wherein the polymer electrolyte comprises a polymer matrix, and the polymer matrix is ​​composed of three blocks of acryl, urethane and phosphate. The polymer formed by the self-polymerization of the polymerized monomer, or the polymer formed by the copolymerization of the polymerized monomer composed of the three building blocks of acryl, urethane and phosphate ester and other monomers. The polymer electrolyte can be used in a battery, and the polymer matrix can undergo a self-crosslinking reaction at a high temperature of 130-190° C. to generate a dense thermosetting polymer that can cut off ion transport and prevent the occurrence of thermal runaway of the battery; and The self-crosslinking reaction is an endothermic reaction, which helps to quickly reduce the battery temperature and prevent the battery from thermal runaway; the polymer electrolyte can also capture free radicals and has intrinsic flame retardancy; the above characteristics of the polymer matrix act synergistically , which can effectively prevent the occurrence of thermal runaway of the battery.

The invention provides a carbon cloth with vertical graphene with evenly distributed cobalt particles, its preparation method and application. The preparation method comprises: growing vertical graphene on carbon cloth by PECVD reaction to obtain the first carbon cloth; uniformly dispersing 2-methylimidazole and cobalt nitrate in water respectively to obtain the first solution; adding the first carbon cloth to Mix and stir in the first solution, react for 4h-5h to grow Co-MOF, wash and dry to obtain the second carbon cloth; anneal the second carbon cloth under the protection of argon to obtain vertical graphene with evenly distributed cobalt particles carbon cloth. The sodium-ion full battery assembled from the carbon cloth with vertical graphene with cobalt particles uniformly distributed in the present invention can achieve good electrochemical performance.

The invention provides a solid electrolyte, a lithium metal negative electrode and a preparation method thereof. The solid electrolyte is a composite polymer electrolyte composed of lithium lanthanum titanium oxide and linear polyurethane. The preparation method is as follows: firstly, lithium lanthanum titanyl oxide particles with complete crystalline phase are prepared by combining hydrothermal synthesis and high-temperature calcination; then, lithium lanthanum titanyl oxide particles and linear polyurethane are blended and stirred, and solvent evaporation is performed , to prepare a solid electrolyte. The lithium ion conductivity of the solid electrolyte prepared by the present invention at room temperature reaches 3.8×10 ‑4 S cm ‑1 . At the same time, the battery assembled with this solid electrolyte exhibits excellent cycle performance and excellent specific capacity at room temperature. In the invention, the lithium metal negative electrode can be obtained by combining the solid electrolyte and the lithium metal sheet.

A lithium dendrite-free anode with a carbon nanotube film directly compounding molten lithium metal and a preparation method thereof relate to a lithium dendrite-free anode obtained by directly infiltrating a carbon nanotube film with liquid lithium and a preparation method thereof. The heat exchange between the carbon nanotubes and the environment has a temperature gradient in the direction perpendicular to the surface of the material. Adjusting the temperature gradient can make the liquid lithium metal and the upper carbon nanotube film generate negative Gibbs free energy, which in turn drives the liquid lithium metal to infiltrate into the upper carbon nanotube film. The composite material formed by liquid lithium directly and uniformly coated or poured into the carbon nanotube film can be used as an anode for a lithium-free dendrite lithium metal battery with a three-dimensional nanostructure. At ultra-high current density, the lithium-carbon nanotube film composite anode can achieve stable operation without lithium dendrites in symmetrical batteries, and when it is used as an anode in a lithium-sulfur full battery, it can achieve high-rate cycle stability of the battery. The preparation process of the invention is simple and practical, the control is convenient, the large-scale commercial production is easy to be realized, and the lithium dendrite can be effectively suppressed, thereby providing a guarantee for expanding the application field of the lithium metal battery.

The invention relates to an anode of a lithium rechargeable battery. The anode comprises a lithium plate as the anode; a modified graphene layer is arranged on the surface of one side of the lithium plate. The anode of the lithium rechargeable battery can effectively inhibit the metal lithium dendrite. The lithium rechargeable battery with a composite layer, disclosed by the invention, has bettercyclic performance and coulomb efficiency.

The present application discloses a three-dimensional carbon material, a preparation method and an application thereof. The three-dimensional carbon material is tubular; the three-dimensional carbon material includes a graphitized pipe wall and a hollow lumen enclosed by the pipe wall. The three-dimensional carbon material enables the selective deposition of lithium metal in the tube, effectively suppresses dendrites generated during the deposition / precipitation of lithium metal, greatly reduces the risk of lithium metal negative electrodes, and improves the cycle life of the battery. and Coulombic efficiency, reducing voltage polarization.

The invention discloses an electrolyte solution for a secondary zinc-nickel battery and a preparation method thereof. The preparation method of the invention includes compounding and constant volume of various battery electrolyte raw materials. The electrolyte solution prepared by the invention includes the following mass components: Raw materials: 25‑50w% alkali, 0.01‑5w% LiOH / lithium salt, 0.1‑5w% boric acid and / or borate, 0.01‑1w% aluminum-containing substances, 5‑15w% ZnO, 0.005‑ 0.03w% SiO 2 , and the balance is pure water; the electrolyte solution prepared by the invention has good circulation performance, long service life and high commercial value.

The present invention relates to an intrinsically safe electrolyte for a secondary lithium-sulfur battery and a preparation method thereof. The electrolyte comprises a lithium salt and an organic solvent, and the organic solvent is a phosphate solvent or a phosphate solvent and a hydrofluoroether. A mixed solvent composed of a similar solvent; lithium salt is added to the organic solvent, and the electrolyte is uniformly stirred to form an electrolyte, that is, an intrinsically safe electrolyte for a secondary lithium-sulfur battery is prepared. Compared with the prior art, the lithium-sulfur battery after using the electrolyte can realize safe cycling, which is embodied in the uniform lithium deposition morphology, no obvious dendrites and complete flame retardancy. On this basis, the electrochemical performance is significantly improved. , which is more advantageous than other sulfur materials and lithium metal batteries.

This patent proposes the preparation and application of a lithium metal negative electrode with an oxide layer. The extruded lithium metal is soaked in organic esters, and ex-situ hydrolysis and polycondensation form a stable porous oxide layer, which effectively inhibits the continuous reaction and consumption of the electrolyte and lithium metal, and improves the battery cycle stability.