41results 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 present invention relates to a positive electrode material for secondary battery and the preparation method thereof, wherein the said positive electrode material comprises LixNi1−y−zCoyMezO2±n as the main component, 0.9≦x≦1.1, 0<y≦0.3, 0≦z≦0.1, 0≦n≦0.1 and Me is selected at least one or two elements from the group consisting of Mg, Zn, Mn, Co, Al and Ca in the formula, and LivNi1−aMe′aO2±m or LixNi1−yMe″yPO4 existed on the polycrystalline surface of the main component and / or among the crystal phase of the main component. The proportion of peak intensity ratio of (003) to (104) of the positive electrode material in the polycrystalline X-ray diffraction spectrum is 2.0≦I(003) / I(104)≦3.0. The secondary battery comprising said positive electrode material is liquid, solid or polymer lithium secondary battery or lithium ion battery.

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 provides a lithium alloy strip and a preparation method thereof. The lithium alloy strip comprises a uniformly mixed metal lithium elemental substance and a transition metal elemental substance of micro-nano structure; The preparation method comprises the following steps: (1) Heating the metal lithium to a molten state in an environment having the dew point not higher than -50 DEG CAND having an oxygen content of not more than 10 ppm; (2) adding the transition metal into the molten metal lithium, and uniformly mixing to form a molten alloy state; 3) cooling to room temperatureto obtain lithium alloy material; 4) heating that lithium alloy material obtained in the step 3) to 30-500 DEG C; (5) processing the lithium alloy into an alloy strip with a thickness of 1 to 100 [mu]m. The preparation method is simple and feasible, the cost is low, and the prepared metal lithium alloy strip has higher hardness, strength and better processing performance than the lithium strip, and can be applied in a metal lithium battery to effectively improve the coulomb efficiency and cycle life of the battery.

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 discloses an aspirin molecule imprint electrochemical sensor and a preparation method thereof. The molecule imprint technology is combined with the electroanalysis chemical detection technology for use, aspirin serves as template molecules, acrylamide serves as functional monomers, and rosin, one of the characteristic resources in Guangxi province, is tightly combined and serves as the raw material for synthetizing maleated rosin acrylic acid glycol ester which is used as a cross linker. The aspirin molecule imprint electrochemical sensor can be used for measuring content of aspirin, and shows better selective identification performance; and an electrochemical analysis method for measuring aspirin based on the sensor is simple and practical, and overcomes the defect that the traditional method is complicated.

The invention discloses a preparation method for a polypyrrole-poly-dopamine composite coating. The preparation method includes the following steps that (1) dopamine and a dopant are dissolved into deionized water, then a pyrrole monomer without impurities is continuously added to be dissolved, dry nitrogen is then led in to remove dissolved oxygen in a mixture, and an electrolyte with the pH ranging from 1 to 8 is obtained; and (2) in the above electrolyte, a constant potential polymerization process is adopted for conducting polymerization on the surface of one side of a pure titanium substrate to obtain the polypyrrole-poly-dopamine composite coating, and oxide, miscellaneous dirt and grease on the surface of the pure titanium substrate are removed through pretreatment. According to the method, an electrochemical method is adopted for conducting polymerization on the dopamine and the pyrrole, the polymerization time is short, polymerization can be carried out under the acidity and alkaline conditions, and meanwhile a polymerization film obtained through polymerization has some beneficial effects of the dopamine and the pyrrole; and a larger possibility is provided for potential application of the polymerization film.

The invention provides a lithium alloy anode material and a preparation method thereof. The preparation method comprises the following steps: in an environment that the dew point is not higher than 50DEG C below zero and the oxygen content is not higher than 10 ppm, heating the lithium metal to a melting state; adding transition metal into the molten lithium metal, performing heat preservation for 5 minutes to 15 minutes, and uniformly mixing to form a molten alloy state; cooling the molten state alloy to room temperature to obtain the lithium alloy anode material. The preparation method disclosed by the invention has the advantages of simplicity, feasibility and low cost; when being applied to a lithium battery, the prepared lithium metal alloy anode material can effectively improve thecoulomb efficiency of the battery and prolong cycle life of the 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 discloses a sintered NdFeB magnet surface temporary protection organic coating and a preparation method thereof. A prepared silicyl organic protection thin film is modified through a compounding mode of anode metal nanoparticles such as Al and Zn; by means of the compounding of the nanoparticles, the porosity of the thin film can be remarkably reduced, and the uniformity and consistency of the magnet surface silicyl organic protection thin film are improved; meanwhile, anode metal nanometer Al powder and nanometer Zn powder are compounded in the silicyl organic protection thin film, in the efficacy-loss early period of a protection layer, the electrochemical activity of nanometer Al and nanometer Zn is remarkably higher than the electrochemical potential of an NdFeB base body, and therefore sacrificial anode protection can be provided for the base body in the electrochemical corrosion environment, corrosion protection can continue to be provided for the magnet, the anticorrosion performance and the mechanical performance of the magnet surface silicyl film are further improved, and finally the surface temporary anticorrosion organic coating with excellent comprehensive performance is obtained.

The invention relates to a boron-doped lithium nickel cobaltate anode material. The chemical formula of the boron-doped lithium nickel cobaltate anode material is LiNiXCoYBZO2, wherein 0.7<X<0.9, 0.1<Y<0.3, 0<Z<0.1, and X+Y+Z=1. The preparation method of the boron-doped lithium nickel cobaltate anode material comprises the following steps: 1. proportionally mixing a compound containing nickel, cobalt and lithium and a compound containing boron; 2. in an air atmosphere, pretreating at 300-600 DEG C for 1-10 hours; 3. in an oxygen atmosphere, synthesizing at the high temperature of 700-850 DEG C for 3-15 hours; and 4. cooling to normal temperature, pulverizing, and screening to obtain the final product. In the boron-doped lithium nickel cobaltate anode material provided by the invention, boron is used instead of metal doping ions, thereby enhancing the first capacity, first discharging efficiency, cycle performance and safety of the material; and the method provided by the invention has the advantages of simple production technique, fewer steps, short production time, low energy consumption, no pollution and zero discharge, thereby being very suitable for industrial production.

The present invention relates to the field of lithium ion batteries, especially provides application of hydroxyl compound in a high-voltage lithium ion battery and a high-voltage lithium ion battery.The high-voltage lithium ion battery comprises at least one of a functional additive for a high-voltage lithium ion battery, a high-voltage lithium ion battery electrolyte or high-voltage lithium ionbattery positive electrode slurry, the high-voltage lithium ion battery electrolyte and high-voltage lithium ion battery positive electrode slurry comprise the functional additive for the high-voltagelithium ion battery e, and the functional additive comprises a hydroxyl compound. The hydroxyl in the hydroxyl compound is reacted with the Li in the lithium ion battery positive electrode material to form an SEI film with good performances and the SEI film can effectively inhibit the reaction between the electrolyte solvent and the positive electrode materials so as to improve the cycle performance of the lithium ion battery.

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 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 discloses a preparation method of a sintered neodymium-iron-boron magnet with high corrosion resistance and high coercive force, which comprises the following steps: fully mixing neodymium-iron-boron alloy powder with nanoscale low-melting-point metal according to a certain mass ratio, putting the mixture into a magnetic field of 1.8 T or above, and carrying out oriented compression to obtain a pressed blank; and then carrying out high-temperature sintering on the pressed blank, carrying out grain boundary diffusion heavy rare earth treatment on the prepared sintered neodymium-iron-boron magnet, and finally carrying out tempering heat treatment. According to the preparation method, the grain boundary is doped with the nanoscale low-melting-point metal, so that the chemical activity of a grain boundary rare earth-rich phase can be reduced; in addition, a smoother diffusion channel is provided for grain boundary diffusion, so that the problem of grain boundary diffusion depth is solved, and controllable preparation of the sintered neodymium-iron-boron magnet with high corrosion resistance and high coercivity is realized.

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 technical field of batteries, in particular to a surface-modified positive electrode material and a surface modification method thereof. The positive electrode material surface modification method provided by the invention comprises the following steps: S1, mixing a cobalt source with an organic solvent to obtain an intermediate, and depositing the intermediate on a graphite sheet by adopting a chemical deposition method to obtain a coating material; and S2, mixing the positive electrode material with the coating material obtained in the step S1, and calcining to obtain the surface-modified positive electrode material. According to the invention, the cobalt source is deposited on the graphite flake through a chemical deposition method to form the graphite flake of which the surface is uniformly coated with cobalt hydroxide, so that not only can the stability of the coating material structure be improved, but also the electrochemical activity of cobalt hydroxide in the coating material can be further improved; the graphite flake with cobalt hydroxide deposited on the surface is used as a coating material to be sintered with the positive electrode material, so that the obtained surface-modified positive electrode material is good in structural stability and high in specific capacity, and the cycle retention rate of the battery can be improved.

The invention provides a cellulose composite carbon aerogel and a preparation method thereof, and the cellulose composite carbon aerogel is prepared by taking cellulose nanofibers and carbon nanotubes as raw materials, mixing and dispersing the raw materials through dispersoid, and then preparing cellulose nanofiber / carbon nanotube composite carbon aerogel through bidirectional freezing, freeze drying and high-temperature carbonization. The invention also provides an application of the cellulose composite carbon aerogel in the aspect of a battery electrode, and the cellulose composite carbon aerogel has an ultra-large specific surface area and an excellent compression ratio under ultra-low density, and shows super-hydrophilicity, high electrochemical activity, good compression resilience, good structural stability and certain mechanical strength; and the method can be used for various electrochemistry-based water-based flow batteries. The invention solves the technical problem that the existing cellulose carbon aerogel is poor in compressibility and mechanical strength, and belongs to the technical field of batteries.

This invention relates to a manganese bioxide electrolysis modification method of lithium battery, which is characterized by the following: the electrolyzed gamma-MnO#-[2] powder is protected in the oxygen of 95 to 100 percent and is calcined with high temperature of 370 to 380 degrees; it forms the convection of oxygen in high temperature space for 24 hours.

The invention relates to an electrochemical preparation method of a phenylamine-4-aminosalicylic acid copolymer. The following three electrode electrolytic cells are used: a glassy carbon electrode used as a working electrode, a platinum electrode used as an auxiliary electrode and a saturated calomel electrode used as a reference electrode; electrolyte is a mixed solution of 0.10-0.50 mol.dm-3 of phenylamine, 0.01-0.02 mol.dm-3 of 4-aminosalicylic acid and 1.50-2.50 mol.dm-3 of sulfuric acid; and electrolysis is carried out by a cyclic voltammetry, and an obtained electrolytic product is washed and dried to obtain the phenylamine-4-aminosalicylic acid copolymer. The phenylamine-4-aminosalicylic acid copolymer prepared by the method still has good electrochemical activity in a high-alkaline solution of which pH is 9.0-11.0. Moreover, the preparation method is convenient to control and easy to implement.

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.

The invention discloses a method for reducing surface alkalinity of pre-lithiated silica. The method comprises the following steps: S1, carrying out pre-lithiation treatment on SiO by using a lithium reagent; s2, the pre-lithiated SiO and the pre-lithiated TiO2 are mixed; and S3, carrying out heat treatment on the mixed SiO and TiO2. And the lithium reagent is selected from any one or more of LiOH, Li2CO3 and LiH. According to the method, TiO2 and pre-lithiated SiO are mixed, so that residual alkali on the surface of the pre-lithiated SiO negative electrode material is converted into lithium titanate with electrochemical activity in situ, and the ionic conductivity and electrochemical reaction activity of the negative electrode material are enhanced while the surface alkalinity of the negative electrode material is reduced.

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 discloses a halide solid electrolyte with electrochemical activity and a preparation method and application thereof, the solid electrolyte is a zirconium-doped ferric lithium chloride solid electrolyte, the chemical general formula of the solid electrolyte is LiFe1-4x / 3MxCl4, M is a metal element with the valence state higher than + 3, 0 lt; xlt; 1. According to the halide solid-state electrolyte with the electrochemical activity, the ionic conductivity order of magnitude is improved, the room-temperature ionic conductivity is improved to 10 <-3 > S / cm from 10 <-6 > S / cm by three orders of magnitude, so that the material is changed from'unavailability 'to'high performance', and the application requirement of an all-solid-state battery is met.