84results about How to "Stable surface structure" patented technology

The invention relates to a method for modification of a biocompatible component comprising the steps of a) providing a biocompatible component at least partly covered by metallic oxide; and b) treating at least a part of said component, which part is covered by said metallic oxide, with an aqueous composition comprising oxalic acid; whereby a modified metallic oxide is obtained. The invention also relates to a biocompatible component comprising a substrate having a surface comprising a) a microstructure comprising pits separated by plateus and/or ridges; and b) a primary nanostructure being superimposed on said microstructure, said primary nanostructure comprising depressions arranged in a wave-like formation.

The invention discloses a surface-modified lithium cobaltate material and a preparation method thereof. The lithium cobaltate material comprises a core particle and a surface-modified layer coating the core particle, wherein the core particle is a lithium cobaltate-based positive material with a structural formula as follows: LixCo(1-y)MyO2, wherein x is greater than 1 and not greater than 1.2, y is not less than 0 and not greater than 0.1, M is a doping element; the surface-modified layer comprises a Li<+1> conducting layer and an electrolyte isolating layer; the core particle is coated by the Li<+1> conducting layer and the electrolyte isolating layer in sequence. According to the invention, by sufficiently utilizing dynamic characteristic that different substances react with residual Li salt on the surface of the lithium cobaltate, and characteristic of final reaction product performance, the lithium cobaltate material with double coating layers is prepared. The material is high in comprehensive performances, has high discharge capacity, high cycling stability and the like. The preparation method disclosed by the invention is simple in process and easily realizes industrial production.

The invention discloses a preparation method of a magnetic sandwich nano immunosensor and application of the preparation method. The preparation method is characterized by comprising the following steps: mixing and stirring a collaurum solution and silane ferriferrous oxide into a colorless and transparent solution, and carrying out magnetic separation by externally applying a magnet to obtain FE3O4/Au colloid nano magnetic beads; loading horse radish peroxidase (HRP) and secondary antibodies of an object to be measured to the FE3O4/Au colloid nano magnetic beads to obtain a secondary antibody probe Fe3O4/Au-HRP-Ab2; electrically depositing Au to a glassy carbon electrode, loading primary antibodies of the object to be measured, and then closing non-specific active sites by using protein to obtain an Abl/Au/GCE electrode; and finally, loading antigen to the Abl/Au/GCE electrode, and then obtaining the sandwich nano immunosensor by combining the magnet probe. The magnetic sandwich nano immunosensor can be used for measuring the concentration of melamine, tonyred, clenbuterol or estrogen in food and has the advantages of high detection speed, high accuracy and sensitivity and low cost.

The present application discloses a doped lithium cobaltate having a composite cladding layer, which has a particularly stable surface structure as a cathode material for lithium ion batteries, At that same time, the surface coat layer has electrochemical activity and lithium ion transport ability, In the prepared lithium ion battery, the electrode material can be blocked from directly contactingwith the electrolyte, the side reaction inside the battery can be reduced, and the safety performance can be improved. At the same time, the cladding layer has lithium ion transport ability, and the impedance increase in the battery cycle process can be limited slowed down.

The invention discloses a compounding and coating method of an anode material for a lithium ion cell. The compounding and coating method comprises the steps that fluorides of La, Al and Mg are coprecipitated on the surface of a lithium ion anode material in a liquid phase; and then, the anode material for the lithium ion cell cooperatively coated by La3+, Al3+, Mg2+ and F- is obtained by heat treatment. With the adoption of the coating treatment, the circulating property and the rate discharge property of the anode material under the charge cut-off voltage are improved; and the high-temperature circulating property of a spinel manganese oxide lithium material and the ordinary pressure circulating property of a nickelic anode material are improved.

The invention relates to an apparatus and a method for repairing polluted soil and underwater by cooperation of in-situ electricity and electrochemistry. In the method, a mono-metal or double-metal electrode having a nano-scale surface or an air cathode having advanced pollutant oxidation function is formed for reducing and degrading organic pollutants, then the formed electrode is used as a cathode in the electric repairing apparatus; a direct-current electric field is applied to a medium to migrate the organic pollutants in the medium to the cathode, thus achieving cooperation of electric field driven pollutant migration and in-situ electrode electrochemical degradation. The method avoids complex engineering problems, such as secondary treatment after extraction of a cathode solution, extra addition of a redox agent, arrangement of PRB and the like, during a conventional electric repairing process, and can significantly reduce engineering work load and repairing cost in the electricrepairing. The invention provides the in-situ repairing method for the polluted soil and underwater, which is simple in preparation, is low in cost and has high-effective cooperation.

The invention discloses a core-shell high-nickel monocrystal nickel cobalt lithium manganate positive electrode material and a preparation method and application thereof, and the positive electrode material comprises a core layer and a shell layer arranged on the outer surface of the core layer, wherein the core layer and the shell layer form a core-shell structure. The material of the core layeris Lia(NixCoyMn<1-x-y>)O2, wherein 1.0 <= a <= 1.15, 0.6 < x <= 0.95, 0.01 <= y <= 0.2, 1-x-y > 0, and the material of the core layer is of a monocrystal type; the material of the shell layer is Lib(NiiCojMnkM<1-i-j-k>)O2, wherein 0.9 <= b <= 1.05, 0.2 <= i <= 05, 0.15 <= j <= 0.5, 0.15 <= k <= 0.5, 1-i-j-k > 0, and M is one or more of Mg, Al, Zr, Ti and W. The preparation method comprises the following steps: firstly preparing high-nickel monocrystal lithium nickel cobalt manganate, then preparing nano lithium nickel cobalt manganate slurry, adding the high-nickel monocrystal lithium nickel cobalt manganate and an M-containing additive into the slurry, performing mixing, carrying out spray drying, and performing sintering in an oxygen atmosphere to prepare the lithium nickel cobalt manganate positive electrode material. The invention also discloses an application of the positive electrode material in lithium ion batteries. The positive electrode material has excellent first charge-discharge efficiency and high capacity retention rate, and also has excellent cycle performance and safety performance at a high temperature.

The invention relates to the field of batteries, and in particular relates to a long-life, high-energy density and low-cost mixed cathode material for lithium ion secondary batteries and a preparation method thereof. The mixed cathode material for the lithium ion batteries, provided by the invention, comprises the following raw components in percentage by weight: 20-60% of doped lithium-manganese spinel composite oxide and 40-80% of doped lithium-nickel-cobalt-manganese composite oxide. According to the mixed cathode material for the lithium ion batteries, provided by the invention, proper doping is carried out on lithium-manganese spinel to ensure that the lattice imperfection can be effectively reduced, the crystal structure is stabilized, the lattice distortion is restrained, the manganese dissolution is reduced, the cycle life is prolonged, the large current charge-discharge property and safety performance can be improved so as to satisfy the important requirements on the lithium ion batteries for EV (Electric Vehicles) and HEV (Hybrid Electric Vehicles); for the lithium-nickel-cobalt-manganese composite oxide of a layered structure, the doping has the same effect and the cycle performance, the rate performance and the safety performance can be better improved.

The invention is applicable to the technical field of a lithium battery, and provides a gradient-doped high-energy-density type lithium cobalt oxide positive electrode material and a preparation method thereof. According to the lithium cobalt oxide material prepared by the method, Al and Mg concentrations in the material inner layer are relatively low while Al and Mg concentrations in the materialouter layer are relatively high, so that gradient doping distribution is formed, thereby eliminating structural sudden change caused by sudden change of the doped element concentrations; meanwhile, the doping element concentration on the surface of the material can be improved, and the material surface structure can be stabilized; in addition, after Al and Mg gradient-doped cobalt oxide X<2> is obtained, Mn, Ti, Zr and Ce doping and primary calcining are performed to obtain primary lithium cobalt oxide particles D1; and next, F and PO<4><3-> doping and secondary calcining are performed to finally obtain the gradient-doped high-energy-density type lithium cobalt oxide positive electrode material. By virtue of the preparation method, the electrochemical performance of the lithium cobalt oxide material in a high charging cut-off voltage can be improved effectively.

The invention provides a surface reinforced concrete release agent, comprising 10-30% of an oil, 1-3% of a defoaming agent, 5-10% of an active component, 1-2% of a penetrating agent, 2-5% of a corrosion inhibitor, 1-5% of a compatibilizer, and the balance of deionized water. The release agent is good in releasing effect and convenient to use and is good for surface performance and durability of concrete.

The invention provides a positive active material with a phosphate coated spinel structure. The positive active material contains lithium-containing compound particles which have the spinel structure and the chemical formula LiMn(2-x)AxOy and a phosphate coating layer coating the surfaces of lithium-containing compound particles, in the chemical formula LiMn(2-x)AxOy, A is selected from one or more of Ni, Fe, Co, Ti, Y, Sc, Ru, Cu, Mo, Ge, W, Zr, Ca and Sr, x is larger than or equal to 0 and smaller than or equal to 0.7, and y is larger than or equal to 3.8 and smaller than or equal to 4.2; the lithium-containing compound particles have transition layers, and the transition layers contain dispersion elements which are diffused to enter the lithium-containing compound particles through coating and optional calcination. The invention also provides a preparation method of the positive active material and an application of the positive active material in a lithium ion secondary battery. The positive active material has improved circulation stability and coulombic efficiency when used in the lithium ion secondary battery.

The invention relates to a lead-calcium alloy used on a starting type storage battery, which is composed of a lead-calcium-tin alloy. The lead-calcium-tin alloy comprises calcium, tin, aluminum, misch metal and lead; the weight percentage of the calcium in the lead-calcium-tin alloy is 0.02 to 0.06 percent; the weight percentage of the tin in the lead-calcium-tin alloy is 0.10 to 1.0 percent; the weight percentage of the aluminum in the lead-calcium-tin alloy is 0.01 to 0.03 percent; the weight percentage of the misch metal in the lead-calcium-tin alloy is 0.01 to 1.00 percent; the other weight percentage is composed of the lead. Compared with prior art, an electric vehicle battery which is assembled by a lead-acid accumulator grid produced by using the lead-calcium alloy has the advantages of corrosion resistance, deep cycle, large-current discharge and long service life.

The invention relates to a modifying method by coating a surface of a lithium-rich positive electrode material with alumina. The method comprises the following steps: carrying out Al2O3 surface modification on a lithium-rich positive electrode material with a sol solution, enabling a Al3+ ion coated salt to react with ammonia water, adding citric acid to form a sol solution, and then adding the lithium-rich positive electrode material to the sol solution, directly evaporating to dryness, and carrying out heat treatment to obtain a modified lithium-rich positive electrode coated with Al2O3 on the surface. The prepared lithium-rich positive electrode material has excellent electrochemical performances, the first discharge specific capacity is 289.69mAh/g and the first coulomb efficiency is 77.01% at the charge and discharge rate of 0.1C, and the capacity retention rate is still 95.45% after 50 cycles at a rate of 1C, showing a good cycle performance.

The invention discloses a vertical graphene-copper foil composite current collector based on in-situ growth and a preparation method thereof and belongs to the technical field of a lithium ion battery. The current collector is advantaged in that the vertical graphene-copper foil composite current collector is prepared in situ by plasma enhanced chemical vapor deposition, the prepared graphene-copper foil composite current collector has a micron-sized petal-like structure with a contact angle range of 125-143.5 DEG, has super hydrophobic and lipophilic properties, can effectively improve infiltration between the current collector and an active material interface, increases the contact surface and increases bonding strength, so the active material is not easy to fall off, and thereby interface impedance is reduced, infiltration of a negative electrode prepared by the current collector and the electrolyte is facilitated, the electrolyte is in sufficient contact with the negative electrodeactive material, the contact area is enhanced, and battery polarization is reduced. The method is advantaged in that operation is simple, cost is relatively low, and the method is suitable for large-scale production.

The invention discloses a core-shell high-voltage monocrystal nickel cobalt lithium manganate positive electrode material and a preparation method and application thereof, and the positive electrode material comprises a core layer and a shell layer arranged on the outer surface of the core layer, wherein the core layer and the shell layer form a core-shell structure. The core layer is made of Lia(NixCoyMn<1-x-y>)O2, wherein 1.0 <= a <= 1.15, 0.2 <= x <= 0.6, 0.1 <= y <= 0.5, 1-x-y > 0, and the material of the core layer is of a monocrystal type; the material of the shell layer is LibCokM<1-k>O2, wherein 0.9 <= b <= 1.05, 0.8 <= k <= 0.99, and M is one or more of Mg, Al, Zr, Ti and W. The preparation method comprises the following steps: firstly preparing monocrystal lithium nickel cobaltmanganate, then preparing nano cobaltosic oxide slurry, adding the monocrystal lithium nickel cobalt manganate, lithium salt and an M-containing additive into the slurry, performing mixing, then carrying out spray drying, and performing sintering in an air atmosphere, so as to prepare the nano cobaltosic oxide lithium manganate cathode material. The invention also discloses an application of the positive electrode material in lithium ion batteries. The positive electrode material has excellent first charge-discharge efficiency and high capacity retention rate, and also has excellent cycle performance and safety performance under high voltages of 4.35 V and 4.4 V.

The invention relates to a lithium-rich manganese-based positive electrode material coated with double conductive layers as well as a preparation method and application thereof. The lithium-rich manganese-based positive electrode material structurally comprises a lithium-rich manganese-based material core, a spinel lithium manganate coating layer and a nitrogen-doped graphitized carbon coating layer from inside to outside, an overlapping region exists between the spinel lithium manganate coating layer and the nitrogen-doped graphitized carbon coating layer, and the thickness of the overlapping region is 2-20 nm; the sum of the mass of the spinel lithium manganate coating layer and the nitrogen-doped graphitized carbon coating layer accounts for 1%-10% of the mass of the lithium-rich manganese-based positive electrode material; the chemical expression of the lithium-rich manganese-based positive electrode material is xLi[Li0.33Mn0.67]O2.(1-x)LiMO2@LiMn2O4@C, 0<x<1, wherein M at least comprises two elements of Mn, Ni and Co.

The invention provides a preparation method of a high heat conductivity type graphite film-metal composite material, and relates to the field of materials. The method is characterized in that a vacuummagnetron sputtering mode is used; a metal layer is sputtered on the surface of a graphite film. Therefore, due to the metal layer, the surface structure of the graphite film is stable, and the problem that powder falls off from the graphite film can be solved; moreover, the heat dissipating performance, the flexibility, the longitudinal electricity conductivity, the pressure resistance, and thelike of the graphite film can be improved based on the intrinsic heat conducting performance and electricity conducting performance of metal. The high heat conductivity type graphite film-metal composite material is prepared according to the preparation method and is outstanding in heat dissipating performance, flexibility, longitudinal electricity conductivity, pressure resistance, and the like.

The present invention provides a positive electrode active material having a spinel structure. The positive electrode active material comprises lithium-containing compound particles having a chemicalformula of Li1+xNi0.5-yMn1.5-zOu, wherein -0.2</=x</= 0.2, -0.2</= y</= 0.2, -0.2</= z</=0.2, and 3.8 </= u </= 4.2, the positive electrode active material is characterized in that surfaces of the lithium-containing compound particles have a rock salt phase surface layer having a gradient phosphorus distribution, and contains a metal element that occupies the 16c or 8a position of the spinel octahedron. Compared with the prior art, the surface gradient phosphorus-doped spinel positive electrode active material for the lithium ion battery provided by the invention is advantaged in that (1) thepreparation method is simple in process and low in cost; (2) the comprehensive performance of the spinel positive electrode active material can be greatly improved, and the spinel positive electrode active material has an excellent development prospect.

The invention discloses a high-voltage long-circulation high-nickel single crystal positive electrode material as well as a preparation method and application thereof. A high-voltage long-circulationhigh-nickel single crystal positive electrode material has a chemical formula of LiNixCoyMn1-x-yO2. In the formula, x is greater than or equal to 0.6 and less than 1, and y is greater than 0 and lessthan or equal to 0.4; wherein a nickel-lithium mixed shell layer is arranged on the surface of the high-nickel single crystal positive electrode material, and the concentration of metal elements in the high-nickel single crystal positive electrode material is in gradient distribution. The invention also discloses a preparation method of the high-voltage long-circulation high-nickel single crystalpositive electrode material and an application of the high-voltage long-circulation high-nickel single crystal positive electrode material. A nickel-lithium premixing row layer is formed on the surface of the high-nickel single crystal positive electrode material, so that the structure of the material is stabilized, electrolyte erosion is prevented, and further transformation of the material structure is delayed. Metal elements in the material are distributed in a gradient concentration mode, and the high-pressure cycling stability of the material is enhanced through the gradient distributionstructure.

The invention discloses a TiB<2>-coated lithium nickel cobalt manganate positive electrode material and a preparation method therefor. The positive electrode material has the chemical formula of LiNi<x>Co<y>Mn<z>O<2>, wherein a is greater than or equal to 0.9 and less than or equal to 1.2; x+y+z is equal to 1; the TiB<2> granules are 20-2,000nm in dimensions; and the mass ratio of TiB<2> to thelithium nickel cobalt manganate positive electrode material is (0.002-0.02) to 1. The conductivity of the positive electrode material is improved, and surface polarization effect of the material in the charging-discharging process of the material is lowered effectively, thereby improving rate capability and cycle performance of the material.

The invention discloses a composite coated nickel-rich positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The composite coated positive electrode material comprises a nickel-rich positive electrode base material, a transition layer and a composite coating layer coated on the surface of the base material. The composite coating layer is composed of the composite solid electrolyte and the lithium-boron compound, the positive electrode material can be effectively protected through the combined action of the composite solid electrolyte and the lithium-boron compound, the safety performance of the material is improved, and the rate capability of the material can be further improved.

The invention provides an anode material with a core-shell structure and a manufacture method thereof. The anode material has the core-shell structure, wherein SiO and/or Si serves as a center core, acarbon material serves as a buffer layer, and an aluminum oxide material serves as a shell. The invention further provides a preparation method of the anode material. The anode material has high capacity retaining rate and good cyclic performance.

The invention relates to a preparation method of low-density hollow calcium carbonate. The method comprises the following specific steps: emulsifying a calcium source solution by an emulsifier, wherein the calcium source solution wraps an oil core material to form liquid globules in an oil in water structure; atomizing the emulsion by means of an atomizing nozzle in carbon dioxide gas to be carbonized; carbonizing the calcium source solution outside the liquid globules to form calcium carbonate to wrap the oil core material so as to form particles; finally, drying to form calcium carbonate particles with hollow structures. The hollow calcium carbonate is low in density, stable in structure and good in mechanical property, and the particle diameter and the hollowness can be finely adjusted according to demands, so that the low-density hollow calcium carbonate is convenient and practical and has market application value.