35results about How to "Reduce electrochemical activity" patented technology

The invention is directed to polymer thick film conductor compositions comprising conductive metal particles selected from the group consisting of finely divided powders of platinum group metals and mixtures thereof or metallized graphite particles; in combination with a thermoplastic polymer and optionally, graphite conductive filler.

The invention discloses a tripolycyanamide molecular imprinting electrochemical sensor and a preparation method thereof. A molecular imprinting technology and an electro-analysis chemical detection technology are combined, the tripolycyanamide serves as template molecules, methacrylic acid serves as functional monomer, rosin which is the featured resource of Guangxi is used, and maleated rosin ethylene glycol diacrylate synthesized by using the rosin as the raw material serves as a cross-linking agent. The tripolycyanamide molecular imprinting electrochemical sensor can be used for measuring the content of the tripolycyanamide, and has high selection identifiability; and on the basis of the sensor, an electrochemical analyzing method for measuring the tripolycyanamide is simple and practical, and the shortcoming of complexity of the conventional method is overcome.

The invention discloses a preparation method of a cobaltosic oxide with a high-magnification-performance micro-nano structure. The micro-nano structural cobaltosic oxide is a porous cubic particle which is free from agglomeration and good in dispersing performance, wherein the average diameter of each particle is between 2 micrometers and 10 micrometers and is adjustable, each cubic particle is formed by piling up nano pieces of different sizes and irregular shapes with each other; the thickness and the width of the particle are about 20nm-40nm and 50nm-200nm. The preparation method comprises the following steps: synthesizing a cobalt carbonate precursor by adopting a hydrothermal method and taking cobalt oxide as a metal source, urea as a precipitant, triethanolamine as a dispersant and water as a solvent; performing calcination and pyrolysis to obtain the cobaltosic oxide. The synthesized cobaltosic oxide is excellent in electrochemical performance and especially good in magnification performance and capacity retention ratio; after cycling for 50 times with 1C magnification ratio, the capacity retention ratio is still about 70%, therefore the cobaltosic oxide is an ideal cathode material for a power lithium ion battery.

The invention relates to a crystal type composite gel electrolyte and a preparation method and application thereof. The preparation method is characterized by comprising the following steps that (1) gelatinizing components and soluble salt are added into water, stirring is carried out to complete dissolution to form a transparent and uniform solution, and a gel precursor solution is obtained; (2)gelatinizing is carried out on the gel precursor solution obtained in the step (1) to prepare hydrogel containing saturated soluble salt; and (3) seed crystal is placed above the obtained hydrogel toobtain the crystal type composite gel electrolyte. Compared with the prior art, the preparation process is simple and efficient, materials are cheap and easy to get, the obtained composite gel electrolyte has higher mechanical strength and ionic conductivity, can be applied to energy storage devices such as super capacitors, can automatically adjust the temperature of the materials according to different temperature, even if in an extreme environment, a system can be further maintained to keep stable in short time, and important significance is achieved during dealing with fire hazard and other disasters.

The invention discloses a lithium-sulfur diaphragm with a synergistic effect mechanism, a preparation method of the lithium-sulfur diaphragm and a lithium-sulfur battery, and belongs to the technicalfield of battery diaphragms. According to the invention, the porous conductive carbon material is added into the positive electrode side functional layer; a nano oxide material is added into the negative electrode side functional layer; the positive side and the negative side on the two sides of the diaphragm base membrane are coated with the functional layer slurry to prepare the lithium-sulfur diaphragm with a synergistic effect mechanism. The prepared lithium-sulfur diaphragm is applied to the lithium-sulfur battery, so that the shuttle effect caused by lithium polysulfide in the cycle process of the lithium-sulfur battery can be effectively inhibited, the deposition of lithium sulfide on the surface of an electrode can be reduced, lithium dendrites are prevented from piercing a pole piece, and the capacity retention ratio and the cycle effect of the lithium-sulfur battery are improved.

The invention relates to the field of lithium ion batteries, and particularly provides a functional additive for a high-voltage lithium ion battery, an electrolyte for the high-voltage lithium ion battery and the high-voltage lithium ion battery. The functional additive comprises metal cation and anion groups; metal includes at least one of sodium, potassium, rubidium, cesium, francium, alkaline earth metal and a first sub-group element in a periodic table of chemical elements or a second sub-group element in the periodic table of the chemical elements; and the anion group includes at least one of a sulfur-containing anion group, a boron-containing anion group and a cyanide-containing anion group. The specific metal cation and anion groups in the functional additive jointly form a main framework of an SEI film; and a layer of the SEI film which is dense and uniform and is low in impedance can be formed on the surface of a positive electrode of the lithium ion battery, so that the decomposition of an electrolyte solvent and a conductive lithium salt is inhibited, a positive electrode material is prevented from being corroded by a decomposition byproduct of the electrolyte solvent orthe conductive lithium salt, the structure of the positive electrode material is stabilized, and the cycling stability of the battery is improved.

The invention relates to a preparation method for polyaniline, which solves the technical problems of complex process, low product polymerization degree and poor electric conductivity in existing polyaniline. The preparation method comprises the following steps: dispersing inorganic acid in water; adding an antifreezing agent into a mixture while stirring; cooling the mixture to a temperature below 0 DEG C and then adding aniline into the mixture; after a solution is stirred and reacted, adding manganese dioxide into the solution; uniformly dropwise adding a persulfate solution; then carrying out suction filtration; washing a product by using deionized water and hydrochloric acid, respectively; and drying the product in vacuum to obtain polyaniline. The preparation method for polyaniline can be widely used for preparation of electrode materials.

The invention relates to the field of medicine and medical technology, namely to bone implants, and can be used in surgery, orthopedics, dentistry. Bone implants made of dense tough fibrous or fine-crystal silicate mineral aggregate or rock, jade, have high strength, resistance to crack formation, biological compatibility and the ability to integrate into bone tissue. The technical result—expanding the field of medical devices for implantation into bone tissue.

The invention relates to a crystal type composite gel electrolyte and a preparation method and application thereof. The preparation method is characterized by comprising the following steps that (1) gelatinizing components and soluble salt are added into water, stirring is carried out to complete dissolution to form a transparent and uniform solution, and a gel precursor solution is obtained; (2)gelatinizing is carried out on the gel precursor solution obtained in the step (1) to prepare hydrogel containing saturated soluble salt; and (3) seed crystal is placed above the obtained hydrogel toobtain the crystal type composite gel electrolyte. Compared with the prior art, the preparation process is simple and efficient, materials are cheap and easy to get, the obtained composite gel electrolyte has higher mechanical strength and ionic conductivity, can be applied to energy storage devices such as super capacitors, can automatically adjust the temperature of the materials according to different temperature, even if in an extreme environment, a system can be further maintained to keep stable in short time, and important significance is achieved during dealing with fire hazard and other disasters.

This invention discloses a method for electrically synthesizing intrinsic polyaniline with high electrical activity at high pH values. The method comprises: (1) electrolyzing aniline (0.1-0.6 mol / dm3) in mixed solution of ionic liquid and sulfuric acid in a constant-potential electrolytic tank with Pt electrodes; (2) washing the product with 0.02 mol / dm3 sulfuric acid, and vacuum-drying at 60-70 deg.C to obtain intrinsic polyaniline with high electrical activity at high pH values. Polyaniline thus obtained has the same good properties as that prepared in proton acid, and has excellent electrochemical activity in KCl solution at pH value of 12. The electrochemical activity is only reduced by 24.4% when the pH value changes from 7.0 to 12.0. Besides, polyaniline synthesized in mixed solution of ionic liquid and sulfuric acid has an electrical conductivity of 5.2 S / cm.

The invention belongs to the technical field of material preparation, and discloses a method for preparing a dust-falling and dust-absorbing material from non-metallic minerals and cement plant production raw materials. The method comprises the following steps: calcining limestone blocks to obtain quick lime; cooling quick lime at the room temperature, drying, crushing quick lime to obtain calciumcarbonate powder; drying nonmetallic minerals, grinding nonmetallic minerals to obtain nonmetallic mineral powder; mixing calcium carbonate powder and non-metallic mineral powder, stirring, carryingout ball milling to obtain nano powder; adding a dust collection material, adding water, mixing, pouring the mixture into a mold, drying; and drying in the air to obtain the hollow dust-settling and dust-absorbing material. The raw materials are convenient to obtain, the cost is low, the material preparation cost can be effectively reduced, the dust-settling and dust-absorbing material can be recycled after dust adsorption, and resources are effectively saved. By adding the dust collection material, the adsorption force can be enhanced, higher adsorption capacity is generated for dust particles, and the dust collection effect is better.

The invention discloses a non-aqueous electrolyte. The non-aqueous electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, and the additive comprises lithium tetrafluoroborate and at least one of unsaturated bond-containing dinitrile compounds of formula I and formula II. In the formula I and the formula II, R1, R2, A1 and A2 are independently selected from one or more of C0-C5 aliphatic alkyl groups; and R3, R4, A3 and A4 are independently selected from one or more of the hydrogen atom, the fluorine atom , the chlorine atom, an alkyl group and a phenyl group. Additionally, the invention also discloses a lithium ion battery containing the non-aqueous electrolyte.

The invention discloses a high-energy-storage power battery and a preparation method thereof. The high-energy-storage power battery is formed by assembling a positive electrode part, a negative electrode part, electrolyte and a diaphragm. The positive electrode part, the diaphragm and the negative electrode part are sequentially arranged from bottom to top, and the positive electrode part comprises a positive electrode piece protective layer, a positive electrode active substance layer and a positive electrode piece which are sequentially stacked from bottom to top. The negative electrode partcomprises a negative electrode plate, a negative electrode active material layer and a negative electrode plate protective layer which are sequentially stacked from bottom to top, the positive electrode plate comprises a positive electrode part base material and a carbon composite material, the negative electrode plate comprises a negative electrode part base material and a carbon composite material, and the positive electrode active material layer comprises lithium nickel cobalt manganate, lithium iron phosphate and high-specific-volume tantalum powder. The negative electrode active materiallayer includes a carbon-silicon composite material. The high-energy-storage power battery disclosed by the invention can achieve the effects of no short-circuit fault, no melting combustion fault andno burning explosion fault, the charging target value is more than 85% of the rated capacity within 15-30 minutes, and the minimum charging and discharging cycle is more than 3000 times.

The invention relates to a preparation method of a dicyandiamide molecular imprinting polymer membrane electrode. The preparation method comprises the following steps of carrying out electropolymerization by a tri-electrode system, preparing a polymer membrane from dicyandiamide as a template molecule and o-aminophenol as a functional monomer, depositing the polymer membrane on the surface of an electrode, and removing the template molecule on the electrode so that the dicyandiamide molecular imprinting polymer membrane electrode with template molecule-type holes is prepared. The preparation method is a high-selectivity high-sensitivity high-adsorption capacity method for preparing the dicyandiamide molecular imprinting polymer membrane electrode on the surface of a gold electrode from o-aminophenol as a functional monomer by an electropolymerization method. The dicyandiamide molecular imprinting polymer membrane electrode can be used for determination of dicyandiamide content and has good selective identifiability. The dicyandiamide determination electrochemical analytical method utilizing the dicyandiamide molecular imprinting polymer membrane electrode has simple and practical processes and solves the problem that the original method has complexity.

The invention belongs to the technical field of material preparation, and discloses a method for producing dust-reducing and dust-absorbing materials from non-metallic minerals and raw materials produced in a cement factory. The block is calcined to obtain quicklime; the quicklime is cooled at room temperature, dried and pulverized to obtain calcium carbonate powder; the non-metallic mineral is dried and ground to obtain non-metallic mineral powder; the calcium carbonate powder and the non-metallic mineral powder are mixed, and ball-milled to obtain nano-powder; The dust-absorbing material is added, mixed with water, poured into a mold for drying, and air-dried to obtain a cavity-shaped dust-reducing and dust-absorbing material. The raw material of the invention is convenient to obtain, low in cost, can effectively reduce the cost of material preparation, and the dust-reducing and dust-absorbing material can be recycled after dust absorption, thereby effectively saving resources; adding the dust-absorbing material can enhance the adsorption force and generate stronger dust particles. The adsorption capacity is better, and the vacuuming effect is better.

The invention provides a positive electrode active material as well as a preparation method thereof, and an all-solid-state lithium battery. The positive electrode active material comprises nano-ferrous sulfide and a carbon layer coating nano-ferrous sulfide. The positive electrode active material provided by the invention, firstly, inhibits the volume expansion of ferrous sulfide during a redox reaction; secondly, the active material suppresses a shuttle effect of Li2S generated during the reaction to migrate to a negative electrode; thirdly, Li2S is an insulator which causes the ionic conductivity of the all-solid-state lithium battery to decrease, however, after coating with the carbon layer, the ionic conductivity of the all-solid-state lithium battery is improved due to the relativelyhigh ionic conductivity of the carbon layer; and fourthly, Li2S has no electrochemical activity, and Li2S is further electrochemically active after nano-ferrous sulfide is coated with the carbon layer, the polarization is reduced, and the reversibility of the battery is enhanced, thereby improving the cycle stability and battery specific capacity of the all-solid-state lithium battery comprisingthe positive electrode active material.