127results about How to "High conductivity at room temperature" patented technology

The invention relates to a method for preparing ionic liquid type gel polymer electrolyte through home position polymerization. The method comprises the following steps: taking acrylonitrile and polyethylene glycol dimethyl acrylic acid ester as monomers, taking ethylene carbonate as an organic plasticizer, taking azo diisobutyl cyanogen as an initiator, taking lithium perchlorate as a lithium salt, adding ionic liquid 1-butyl-3-methylimidazole tetrafluoborate as the component of the electrolyte, and adopting a free radical initiation and home polymerization mode to prepare the stable ionic liquid type gel polymer electrolyte. The home polymerization mode has a simple and feasible process, and is capable of directly assembling a lithium cell while simultaneously preparing the electrolyte. The prepared ionic liquid type gel polymer electrolyte has higher room temperature conductivity, good dimensional stability and mechanic properties, and can also be applied to dye sensitization solar cells. The prepared ionic liquid type gel polymer electrolyte cell can avoid the leakage and volatilization of the electrolyte and improve the safety of the cell.

The invention discloses random copolymerization single-ion polymer electrolyte or block copolymerization single-ion polymer electrolyte which is obtained through copolymerization between a (p-vinyl phenylsulfonyl) (perfluoroalkyl sulfonyl) lithium imide monomer and a methoxyl polyethylene glycol acrylate monomer, and a preparation method of the electrolyte. The polymer single-ion electrolyte prepared by the method disclosed by the invention has the advantages of high room-temperature conductivity, high lithium ion transference number, low glass state temperature and degree of crystallinity, good mechanical strength and film-forming properties, wide electrochemical window, good thermal stability and the like, and has potential application values in the aspects of lithium (ion) batteries, carbon-based super-capacitors, solar batteries and the like.

The invention discloses a lithium metal cathode coated with a solid polymer electrolyte and a preparation method thereof. The lithium metal cathode coated with the solid polymer electrolyte is characterized in that metal lithium is used as a cathode, and the surface of the metal lithium is coated with the solid polymer electrolyte in an in-situ polymerizing way; the solid polymer electrolyte is apolymer of vinylene carbonate and polyethylene glycol (methyl) acrylate, or a polymer of vinylene carbonate, polyethylene glycol (methyl) acrylate and a framework monomer. The lithium metal cathode has the advantages that the preparation is simple, the room-temperature conductivity is high, the oxidizing decomposing potential is greater than 4.8V, the stability in interface with the metal lithiumis good, and the cycle property of the metal lithium battery using the metal lithium cathode coated with the electrolyte is obviously improved.

The method includes following step: two monomers are mixed according to the ratio of 1.0 to 1.0-9.0; then it mixes with thermal booster and liquid lithium ion battery solution to form the fore body of gel polymer dielectric; the fore body is injected into half finished battery. the half finished battery is vacuumized and sealed; the half finished battery is made thermal polymerization reaction, and the gel polymer dielectric is obtained.

The invention discloses a lithium single ion conduction polymer electrolyte based on functionalized lithium borate. A double-bond-containing functionalized lithium borate and a sulfydryl-containing compound are subjected to an alkene-sulfydryl click reaction, or the double-bond-containing functionalized lithium borate and the sulfydryl-containing compound and a double-bond-containing polyether are subjected to a poly-alkene-sulfydryl click reaction to prepare a linear or network-shaped all-solid-state or gel catalyst. The lithium single ion conduction polymer electrolyte prepared by the invention has the advantages of simple and easily implemented synthesis, low-cost and easily available raw materials, high room-temperature conductivity, high lithium ion mobility, wide electrochemical window, and the like; and a lithium battery assembled by the electrolyte provided by the invention has high safety, high rate capability, long cycle life and stability.

The polymer lithium ion cell includes anode plate, cathode plate and electrolyte. At least one of the anode plate and the cathode plate has polymer substrate material film comprising polymer A and polymer B, the polymer A is poly(methyl methacrylate-acrylonitrile-lithium methacrylate) and the polymer B is poly(vinylidene difluoride) or poly(vinylidene difluoride-hexafluoropropylene). During the preparation of the cell, the polymer substrate material is painted directly onto anode plate and/or the cathode plate to form cell diaphragm, and electrolyte liquid is filled to form polymer electrolyte. The polymer lithium ion cell has simple preparation process and no need of addition diaphragm.

The invention discloses a ferrite-based ceramic composite material as well as a preparation method and application thereof. The composite material is composed of ferrite, a carbon nanotube and a ceramic material, wherein the ferrite and the ceramic material are cladded on the tube wall of the carbon nanotube, and the ceramic material is one or several kinds of aluminum oxide, aluminum nitride, and silicon nitride. The three phases of materials, namely, the ferrite, the carbon nanotube and the ceramic, are compounded to make the advantages and disadvantages of all phases of materials complementary, so that the electrical conductance of the composite material is increased, the impedance matching performance of the composite material is improved, the wave absorption performance of the composite material is made adjustable, the structure and function integration of the ferrite-based ceramic material is realized, and thus, the application range of the composite material in the high-tech field is expanded. In addition, the powder of the composite material is prepared by adopting a coprecipitation hydrothermal method and is further prepared into a block material by adopting a microwave sintering method, and the ferrite-based ceramic composite material has the advantages that all phases are dispersed uniformly, the densification degree of the sintered material is high, the production cost is low, and the large-scale industrialization is easy to realize.

The invention discloses solid polymer electrolyte added with graphene quantum dots. The solid polymer electrolyte contains the following components: lithium salt, modified graphene quantum dots and solid polyoxyethylene, wherein the lithium salt and the modified graphene quantum dots are dispersed into a matrix of solid polyoxyethylene, the use amount of the lithium salt is 8%-40% of the mass of solid polyoxyethylene, and the use amount of the graphene quantum dots is 1%-80% of the mass of solid polyoxyethylene. The solid polymer electrolyte is easy to prepare, high in room-temperature conductivity and good in electrochemical and interface stability.

The invention discloses a high-conductivity polymer electrolyte and a preparation method thereof. The polymer electrolyte is formed by mixing polycarbonate dissolved with a lithium salt and a substrate polymer, wherein the polycarbonate dissolved with a lithium salt is used as a substrate, the substrate is a conductive constituent, and the substrate polymer is a support body. The polymer electrolyte is simple to prepare and is high in conductivity under a room temperature.

The invention relates to a solidelectrolyte which has the self-crosslinking property and adopts a controllable structure. Acomb-shaped polymer with a main chain adopting a self-crosslinkingpolyolefinstructure and a side chain of PEG (polyethylene glycol) is used as the solidelectrolyte for ion transport, the excellent electrochemical performance is acquired, and meanwhile, a material is ensured to have good molding machinability and high mechanical strength.

The invention refers to a manufacturing method for a kind of compound polypropylene lithium membrane. The materials are base membrane, polymer and nano SiO2 fillers; the step is: the materials are solved in the solvent, the sol compound can be acquired, and then they are transferred to the culture dish, the membrane is immersed in them; the membrane is taken out and transferred to the template, the solvent is absorbed by the molecular sift, then they are transferred into the vacuum drying box to be dried. The invention emphasizes the humidity to membrane by the polymer and the improvement to the interface performance, the organic group component of the SiO2 surface is important to the performance of the compound membrane. The compound membrane upgrades the room temperature conductivity, and improves the interface performance of the positive material/membrane, lithium/membrane. The assembled battery has an excellent circular performance.

The invention relates to the technical field of lithium battery diaphragms, and in particular relates to a composite lithium battery diaphragm and a preparation method of the composite lithium battery diaphragm. The composite lithium battery diaphragm comprises a polypropylene base body diaphragm, wherein composite coatings are sprayed on the two surfaces of the polypropylene base body diaphragm, and the composite coating is sol-like mixed solution formed by polymer and sulfonated polyimide, dissolved in solvent proportionally. The preparation method comprises the following steps: firstly, dissolving polymer and sulfonated polyimide in the solvent proportionally to form the sol-like mixed solution; secondly, coating the two surfaces of the polypropylene base body diaphragm by the mixed solution in the step I; and thirdly, drying the polypropylene base body diaphragm coated by the mixed solution in a vacuum drying oven to obtain the polypropylene composite diaphragm finally. The prepared composite diaphragm can improve the room-temperature conductivity, can greatly improve the interfacial property of the anode material and the diaphragm and Li and the diaphragm, and has good cycle performance after being assembled into the battery.

The colloidal polymer electrolyte system consists of acrylate monomer and its derivative 100 (in weight portions, the same below) including that with functional group 0.4-10; electrolyte liquid 300-1900; initiator 0.2-4 and crosslinking agent 0-5. One of preparation process incldues mixing the components, liquid state filling, polymerizing in the cell chamber to form colloidal polymer electrolyte. The other preparation process includes polymerizing acrylate monomer and its derivative, dissolving the polymer in electrolyte liquid, adding crosslinking agent to mix homogeneously, filling into cell chamber and crosslinking inside the cell chamber to form colloidal polymer electrolyte. The present invention is easy to operate and high in safety, and the prepared electrolyte has excellent comprehensive performance.

The invention belongs to the field of an electrode material for a chemical power supply, and particularly relates to a method for improving the performance of a high-voltage electrode material LiNi0.5Mn1.5O4. The method comprises the steps: uniformly mixing a lithium compound, a boron compound and a phosphorus compound to obtain a mixture, uniformly mixing the mixture with LiNi0.5Mn1.5O4 electrode material or chromium-doped LiNi0.5Mn1.5O4 electrode material, sintering the mixture at a high temperature to obtain a LiNi0.5Mn1.5O4 electrode material with surface being coated with Li0.1B0.967PO4. The surface of LNMO is coated with a layer of LBPO, so that not only can the large-current performance be improved, but also the cycling performance can be improved.

The invention discloses a preparation method and a preparation mold of an all-solid lithium-sulfur battery. The method of the invention includes the following steps: step a, preparing a solid electrolyte: carrying out high-energy ball milling, high-pressure tabletting and high-temperature sintering on Li2S, P2S5, nano silicon and LiF to prepare a sulfide glass ceramic solid electrolyte; step b, preparing a positive electrode material: carrying out high-temperature heat treatment and multiple times of high-energy ball milling processes on S, active substances and the solid electrolyte preparedin the step a to prepare the positive electrode material; step c, preparing a negative electrode material: carrying out surface treatment on metal lithium sheets to prepare the negative electrode material; and step d, placing the prepared positive electrode material, solid electrolyte and negative electrode material into an all-solid lithium-sulfur battery mold, and adopting a lamination method toprepare the all-solid lithium-sulfur battery. According to the scheme of the invention, the solid electrolyte is used to replace an electrolyte solution, so that a lithium-ion battery is safer, and the solid electrolyte has a good inhibition effect on lithium dendrites, and can also inhibit the shuttle effect and the dissolution of the active substances.

The invention belongs to the technical field of polymer synthesis and discloses a polyp-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide-polyvinylidene carbonate copolymer and application thereof. The copolymer is synthesized by the following steps: adding a p-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide monomer, a vinylidene carbonate monomer and a catalyst into a solvent I andperforming polymerization reaction at 70 to 100 DEG C, wherein the p-styrene sulfonyl(trifluoromethyl sulfonyl)lithium imide monomer is prepared by the steps of performing reaction on sodium p-styrenesulfonate and sulfoxide chloride in a solvent at -10 to 25 DEG C, adding an acid-binding agent, an activating agent and trifluoromethyl sulfonamide and performing reaction at -10 to 25 DEG C; addingpotassium carbonate and performing reaction at 25 to 70 DEG C; and adding lithium perchlorate and performing reaction at 25 to 60 DEG C. The copolymer provided by the invention has high lithium ion migration number and room-temperature conductivity, is simple in preparation method, can realize large-scale production and can serve as lithium ion battery electrolyte.