265results about How to "Good electrochemical properties" patented technology

The invention discloses a preparation method of a flexible super capacitor based on paper and application thereof in a self-drive system. The preparation method concretely comprises the following steps: firstly depositing a layer of non-conductive polymer on the surface of the paper; secondly, depositing a metal membrane on the surface of the processed paper to form a flexible conductive paper substrate; thirdly, preparing a metal oxide or a conductive polymer on the conductive substrate to form an electrode material; and finally, assembling two electrode materials by adopting a solid electrolyte to form a super capacitor. The flexible full-solid super capacitor prepared by the method has good bending property and electrochemical properties and has good application prospect in the aspects of energy storage and energy management, especially in the self-drive system.

An electrolyte for a lithium secondary battery is provided. The electrolyte improves battery safety, high temperature storage characteristics, and electrochemical properties of lithium batteries. The electrolyte comprises at least one lithium salt and a non-aqueous organic solvent comprising a cyclic carbonate and a lactone-based compound. The lactone based compound comprises substituents selected from the group consisting of alkyl groups, alkenyl groups, alkynyl groups, aryl groups, and combinations thereof. A lithium battery is also provided, which comprises a negative electrode capable of intercalating/deintercalating lithium, a positive electrode capable of intercalating/deintercalating lithium, and an inventive electrolyte.

Methods of treating single walled and multiwalled carbon nanotubes with ozone are provided. The carbon nanotubes are treated by contacting the carbon nanotubes with ozone at a temperature range between 0° C. and 100° C. to yield functionalized nanotubes which are greater in weight than the untreated carbon nanotubes. The carbon nanotubes treated according to methods of the invention can be used to prepare complex structures such as three dimensional networks or rigid porous structures which can be utilized to form electrodes for fabrication of improved electrochemical capacitors. Useful catalyst supports are prepared by contacting carbon nanotube structures such as carbon nanotube aggregates, three dimensional networks or rigid porous structures with ozone in the temperature range between 0° C. and 100° C.

An active material for a battery has a surface-treatment layer including a compound of the formula (1):

MXO_k  (1)

• • wherein M is at least one element selected from an alkali metal, an alkaline earth metal, a group 13 element, a group 14 element, a transition metal, and a rare-earth element, X is an element capable of forming a double bond with oxygen, and k is a numerical value in the range of 2 to 4.

The invention relates to a graphene quantum dot-graphene composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, enabling full-halogenated benzene, alkali metal elementary substances and substituted aromatic compounds to be stirred and sealed in a reactor, and performing the reaction on the mixture under the reaction pressure higher than the barometric pressure; secondly, after ending the reaction, relieving the pressure to normal pressure, naturally cooling to room temperature, and performing centrifugal separation to obtain a solid; performing washing and vacuum drying on the solid to obtain a dried sample; thirdly, performing high-temperature treatment on the dried sample under the protection of inert gases to obtain the graphene quantum dot-graphene composite material. An oxygen reduction electrode made of the graphene quantum dot-graphene composite material has excellent electrochemical performance, so that the graphene quantum dot-graphene composite material can be applied to the field of fuel cells.

The invention relates to conjugated polycarbazole derivates comprising repeating or alternating units of the formula: wherein R represents a linear or branched alkyl group having 1 to 22 carbon atoms. The conjugated polycarbazole derivatives according to the invention have interesting optical and electrochemical properties which render them suitable for use in the manufacture of diverse electrical, optical and electro-optical devices.

An electrolyte for a lithium battery includes a non-aqueous organic solvent, a lithium salt, and an additive comprising a) a compound represented by the following Formula (1), and b) a compound selected from the group consisting of a sulfone-based compound, a poly(ester)(metha)acrylate, a polymer of poly(ester)(metha)acrylate, and a mixture thereof:

wherein R¹ is a C₁ to C₁₀ alkyl, a C₁ to C₁₀ alkoxy, or a C₆ to C₁₀ aryl, and preferably a methyl, ethyl, or methoxy, X is a halogen, and m and n are integers ranging from 1 to 5, where m+n is less than or equal to 6.

The invention discloses a recycling method of a positive electrode piece of a lithium ion battery, aiming at solving the problem of recycling of a nickel cobalt lithium manganite (nickel cobalt lithium aluminate) positive electrode piece and a lithium cobaltate positive electrode piece generated in a production process of the lithium ion battery. According to the technical scheme disclosed by the invention, the recycling method comprises the following steps: 1, crushing the electrode pieces by classes; 2, immersing with an organic solvent; 3, carrying out stirring treatment; 4, filtering with a sieve net; 5, carrying out centrifugal separation; 6, immersing with an alkaline solution; 7, carrying out the centrifugal separation again; 8, drying and removing iron; 9, carrying out ICP (Inductively Coupled Plasma) analysis; and 10, calcining the materials. The recycling method disclosed by the invention can be used for effectively recycling waste materials of the positive electrode pieces of the waste lithium ion batteries, so that the cost is saved; and by immersing with the alkaline solution and carrying out a plurality of times of separation and washing, impurities, such as metal aluminum, in powder grains can be effectively removed. With the adoption of the recycling method, a positive electrode material and an aluminum foil can be completely separated, and the positive electrode material keeps a relatively good structure and electrochemical properties; and the synthesis of a precursor is not needed and the adding amount of a lithium salt is relatively less.

The invention discloses rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel is characterized by comprising the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 1% of Si, less than or equal to 1% of Mn, less than or equal to 0.035% of P, less than or equal to 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25% of Re and the balance of Fe and belongs to the field of alloy steels. The invention also discloses a preparation method of the rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The preparation method comprises the steps of smelting, casting, carrying out electroslag remelting, casting ingots, forging or rolling, carrying out solution treatment and the like. The rare-earth-type 0Cr17Ni4Cu4Nb special steel, which is disclosed by the invention, as one of precipitation-hardening martensitic stainless steel, has the characteristics of high strength, high hardness, corrosion resistance and the like and is suitable for various technical fields, such as chemical machinery, food machinery, papermaking machinery, aerospace and marine.

PURPOSE: Provided are a non-aqueous electrolyte capable of improving the electrochemical property, and a lithium secondary cell excellent in electrochemical property. CONSTITUTION: The electrolyte comprises a lithium salt; a non-aqueous, organic solvent; and at least one of organic compound selected from compounds of formula 1 to 4(wherein the formula 3 is R9-SO3-Si-(CmH2m+1)3 and formula 4 is CnX2n+1-SO3-Si(CmH2m+1)3). In the formulae, each of R1 to R9 independently represents primary, secondary, or tertiary alkyl group, alkenyl group or aryl group, X is hydrogen or halogen atom, and each of n and m is 0-3. The lithium salt is selected from the group consisting of lithium hexafluorophosphate(LiPF6), lithium tetrafluoroborate(LiBF4), lithium perchlorate(LiClO4), lithium trifluoromethanesulfonate(LiCF3SO3), lithium hexafluoroarsenate(LiAsF6), and mixture thereof.

The purpose of the invention is to provide a lithium ion battery positive material of high specific capacity, good multiplying power performance, good cycle performance, compatible high and low temperature performance and low technology cost, and a preparation method of the lithium ion battery positive material of high specific capacity. The molecule structural formula of the lithium ion battery positive material is LiaMnbFecMdO2, and the method comprises the preparing steps: (1) preparing slurry; (2) preparing gel; (3) drying the gel, and sintering. Compared with the prior art, the inventionhas significant advantages of high specific capacity, good multiplying power performance, good cycle performance, compatible high and low temperature performance(from -20 DEG C to +50 DEG C), simple process and low process cost.

The present invention provides a nonaqueous electrolytic solution which can improve the electrochemical characteristics in a broad temperature range, an electrochemical element produced by using the same and a sulfonic ester compound having a branched structure which is used for the same.

The present invention relates to a nonaqueous electrolytic solution prepared by dissolving an electrolyte salt in a nonaqueous solvent, which comprises a sulfonic ester compound represented by the following Formula (I) in an amount of 0.001 to 5% by mass of the nonaqueous electrolytic solution:

(wherein R represents an alkyl group or an aryl group; A represents a >CH group or a >SiZ group (Z represents an alkyl group or an aryl group); X represents an alkyl group, a cycloalkyl group or an aryl group; Y represents a cycloalkyl group, a -L¹CHR^aOSO₂R^b group or a —Si(R^c)(R^d)OSO₂R^b group; W represents 1 or 2; R^a represents an alkyl group; R^b, R^c and R^d represent an alkyl group or an aryl group; L¹ represents an alkylene group in which at least one hydrogen atom may be substituted with —OSO₂R^e (R^e has the same meaning as that of R), a divalent linkage group containing at least one ether bond or a single bond).

The present invention discloses a CNTs@SiO2@Ni/Al-LDH shell structure three-dimensional nanometer material preparation, which comprises: (1) dispersing carbon nano-tubes in a solution by using hexadecyl trimethyl ammonium bromide (CTAB); (2) coating a SiO2 shell layer on the surface of the uniformly-dispersed carbon nano-tubes to form a CNTs@SiO2 core-shell structure; (3) preparing a AlOOH sol precursor; (4) coating the AlOOH sol precursor on the surface of the CNTs@SiO2 core-shell structure to form a CNTs@SiO2@AlOOH core-shell structure; and (5) preparing a CNTs@SiO2@Ni/Al-LDH core-shell structure through an in-situ growth method. The material and the method of the present invention are mainly used in the fields of super-capacitors, catalysts, sensors and the like.

The invention discloses a high-voltage single crystal ternary material and a preparation method thereof. The chemical formula of the high-voltage single crystal nickel-cobalt-manganese ternary material in the invention is LiNi0. 5Co0. 2Mn0. 3MxO2, wherein x=0. 01-0.1, coprecipitating Ni-Co-Mn hydroxide coprecipitate body is formed by coprecipitation method, and then proper amount of lithium carbonate or lithium hydroxide is added to form lithium carbonate or lithium hydroxide-Nickel cobalt manganese hydroxide co-sediment mixed paste, mixed with paste, evenly mixed, dried, ground, sieved with 160 mesh sieve, the obtained mixture is loaded into an alumina crucible, put into an oxidation furnace for burning, and the firing temperature is controlled at 900-1050 DEG C, heat preservation 10-15 hour, that sintered body is subject to crushing, airflow classification, surface coating treatment of the alumina sol and low-temperature atmosphere heat treatment to obtain a high-voltage monocrystalline nickel-cobalt-manganese ternary material powder. The invention has the characteristics of good electrochemical characteristics under the high-voltage condition, excellent micro-morphology, simplemanufacturing method and easy industrial production.

Disclosed herein are a gel polymer electrolyte, a method of manufacturing the same, and an electrochemical device including the same. According to the present invention, a gel polymer electrolyte including: a multi-component crosslinked polymer matrix; a dissociable salt; and an organic solvent, wherein a content of the multi-component crosslinked polymer matrix is 1 to 50 wt % and the multi-component crosslinked polymer matrix has a net structure formed by crosslinking at least three different kinds of crosslinkable monomers, each of the crosslinkable monomers including at least two functional groups selected from the group consisting of a carboxylic group, an acrylate group, and a cyano group, a method of manufacturing the same using a thermal crosslinking or photo-crosslinking process, and an electrochemical device including the same, may be provided.

The invention belongs to the field of supercapacitor production and specifically discloses a method for producing an all-hydrogel stretchable supercapacitor and the capacitor. The stretchable supercapacitor is assembled in a traditional sandwich structure by taking sodium alginate/polyacrylamide/carbon nanotube/poly(3,4-ethylendioxythiophene)-polystyrolsulfon acid composite hydrogel with high stretchability as an electrode material and sodium alginate/polyacrylamide/sodium sulfate/redox couple composite hydrogel with high stretchability as electrolyte. Each of the electrode material and electrolyte provided in the method is based on a stretchable hydrogel material, and strong adhesion exists between the electrode material and the electrolyte, so that the constraint that an existing assembling technology needs the help of a stretchable base can be avoided. The all-hydrogel stretchable supercapacitor is suitable for a traditional application field of the supercapacitor and high-end application fields such as wearable electronic equipment, stretchable electronic equipment, electronic skins and portable integrated devices.

The invention relates to a multi-component composite anode material and a preparation method thereof. The multi-component composite anode material is characterized by comprising the following components in mass fraction: 15 to 30% of nano silicon powder, 5 to 9% of carbon nano tube, 19 to 40% of expanded graphite, and 37 to 55% of amorphous carbon. The multi-component composite anode material is prepared by carbonizing polyving akohol or polyethylene glycol at high temperature. The nano silicon powder serving as a core active material is used for storing energy; the carbon nano tube is used for conducting electricity; the expanded graphite is dual-functional, including effects of serving as a massive and rigid buffer space and a conductive additive during charging and discharging through silica powder; the amorphous carbon is prepared by carbonizing polyving akohol or polyethylene glycol at high temperature and can be used as a flexible buffer space. The composite material is outstanding in electrochemical properties.

An electromechanical actuator comprising an inherently conducting polymer and a conductor for conducing voltage along the polymer from a first end region thereof. The conductor is adapted for axially extending and contracting with axial expansion and contraction of the polymer. In one form, the conductor is in the form of a helix embedded in the polymer and extends along substantially the entire length of the polymer. Also disclosed is a method for manufacture of the electromechanical actuator.

The invention discloses a three-layer structure single battery of a thermal battery. The single battery comprises a negative current collector plate, a lithium alloy negative electrode layer, an isolation layer, a heating-positive electrode layer and a positive current collector plate which are sequentially laminated, wherein the heating-positive electrode layer is prepared from active Fe powder,LiClO4, anhydrous LiF and anhydrous LiBr. A positive electrode layer in a traditional four-layer structure single thermal battery is abandoned; a novel heating material of LiClO4-active Fe powder is utilized and then the anhydrous LiF and the anhydrous LiBr are added to the novel heating material to form the heating-positive electrode layer; the design of heating powder of the thermal battery is changed; a product after exothermic reaction is ended is directly subjected to electrochemical reaction as a positive electrode material for the thermal battery, so that the specific capacity of the single battery of the thermal battery is significantly improved, the cost is greatly reduced since a traditional sulfide positive electrode material is no longer used, and the economical efficiency is good. Furthermore, the preparation technology of the single battery disclosed by the invention is consistent with that of a traditional thermal battery, the universality of the production process is high, the economical efficiency is good and the single battery has a good engineering application prospect.

The invention relates to a preparation method of a carbon-coated tungsten sulfide hollow nanosphere with a shell layer with a sandwich structure, and belongs to the technical field of production of anano material. The preparation method comprises the steps of: mixing alcohol, deionized water, ammonium hydroxide, ethyl orthosilicate, resorcinol and formaldehyde to perform a reaction, obtaining a solid phase to dry, and after calcining in argon, etching by aqueous solution of sodium hydroxide to obtain a hollow mesoporous carbon nanosphere; and after dissolving tungsten chloride and thiourea solid in the deionized water, adding the hollow mesoporous carbon nanosphere, after carrying out ultrasonic dispersion, performing a hydrothermal reaction, and after obtaining a solid phase to dry, calcining in the argon so as to obtain the carbon-coated tungsten sulfide hollow nanosphere of which the shell layer has the sandwich structure. The preparation method disclosed by the invention has the characteristics of cheap process raw material, simple and environmental-friendly process, high yield and excellent performance; the prepared carbon-coated tungsten sulfide hollow nanosphere of which the shell layer has the sandwich structure can be applied as a lithium ion battery electrode material, a photocatalysis material or an electro-catalysis material.

The invention relates to a preparation method of a laser-induced graphene flexible strain-temperature two-parameter sensor, wherein the method comprises the steps: preparing a preset pattern on a polyimide film by using laser to obtain patterned laser-induced graphene (LIG); uniformly mixing and stirring a PDMS solution according to a ratio of A to B of 10:1, standing for 30 minutes until bubblescompletely disappear, coating the prepared LIG with the PDMS, putting the coated LIG into a heating box at the temperature of 85 DEG C, heating for 120 minutes for curing, taking out after curing, melting the hydrosol with clear water to obtain a flexible material separated from a glass slide, and uncovering the PDMS to peel the LIG from the PI film; and finally, coating with conductive silver adhesive, and bonding a wire to obtain the flexible patterned graphene strain-temperature two-parameter sensor. The preparation method provided by the invention does not need a complex processing technology, is suitable for large-scale preparation and refined pattern processing, has no requirement on an operation environment, and is simple to operate. Wide application prospects are realized in the field of medical health wearable devices.

The invention provides a preparation method of a carbon/carbon nanotube coated lithium iron phosphate composite material by in situ synthesis, and relates to the technical field of battery materials. The preparation method provided by the invention comprises the steps of weighing raw materials of a lithium source, iron powder, a phosphate and a carbon source; first performing ball-milling on the iron powder and the phosphate and adding hydrogen peroxide; and then adding the lithium source and the carbon source to obtain a slurry, drying and sintering under the protection of reducing/inert gas to obtain the composite material. According to the preparation method provided by the invention, the carbon/carbon nanotube coated lithium iron phosphate composite material is prepared by employing an in-situ synthesis method, so the heat treatment time is short; the composite material has relatively high carbon coating rate, stable electrochemical property and relatively good consistency, the cycle performance and the rate performance are greatly improved, the whole preparation process is simple, and the preparation method has the advantages of safety, high efficiency, low cost and environmental protection, etc.