282results about How to "Long cycle life" patented technology

The invention discloses a torispherical cathode material for a lithium ion battery, which has a 'shell-core' graphite composite microstructure, wherein an inner core may be spherical natural graphite, spherical artificial graphite, a mesocarbon microbead or a mixture of the three; a shell is a graphitized product of asphalt; an interlayer distance between the inner core and the shell ranges from 0.3360 to 0.3390nm; and the torispherical cathode material has a mesoporous structure with an aperture of 10 to 50nm, and the ratio of granular length to granular width of the graphite composite ranges from 1.0 to 2.0. The torispherical cathode material for the lithium ion battery has the advantages that: 1, the high-rate performance of the electrode material is improved; and the discharge capacitance of the electrode material still reaches 320 to 340mAh / g after 300 times of circulation at a 5C rate; 2, preparation cost is low and atmosphere pollution is avoided; and 3, the shape of the graphite raw material used by the invention is torispherical and favorable for the cladding uniformity of the asphalt and can better strengthen the structural stability of the composite.

The invention relates to a preparation method for a ternary positive electrode material with a special single-crystal structure. A general formula of the positive electrode material is LiNixCoyMnzMvO2, wherein a sum of x, y and z is 1, x is equal to or larger than 0.2 but smaller than or equal to 0.6; y is equal to or larger than 0.1 but smaller than or equal to 0.4; z is equal to or larger than 0.2 but smaller than or equal to 0.5; v is equal to or larger than 0.01 but smaller than or equal to 0.03; and M is one of Ti, Zn, Cr and F. The preparation method for the ternary positive electrode material with the special single-crystal structure comprises two steps of 1. preparing a precursor-cobalt nickel manganese oxide with the single-crystal structure; and 2. preparing a cobalt nickel manganese ternary material with the single-crystal structure.

This invention relates to the plus plate lead paste of lead-acid battery comprising (by weight percentages based on lead powder): lead powder 100%, 1.4g / cm3 sulfuric acid 8-12%, deionized water 9-11%, lead dioxide 3-4.2%, short fiber 0.05-0.06%, carbon fiber 0.10-0.15%, anisotropic graphite 0.2-0.4% and bismuth oxide 0.05-0.11%. In this invention, on the based on certain water and acid content in the active substance, additional positive pole active substances are added such as anisotropic graphite and bismuth oxide or the like. The changed components improve the primary battery volume and the ratio of weight / energy with prolonging battery service life.

The invention discloses a rich-lithium ternary laminar lithium ion battery cathode material, which has a molecular formula of Li<1+alpha> MnxNiyCozO2, wherein alpha is greater than 0.05 but smaller than 0.5, x is greater than 0.5 but smaller than 0.8, y is greater than 0.05 but smaller than 0.2, z is greater than 0.05 but smaller than 0.2, and the sum of x, y and z is 1. According to a method, a sol-gel method is adopted for preparing the cathode material. The method comprises the following preparation processes that metal salts of soluble manganese sources, nickel sources, cobalt sources and lithium sources are dissolved in water, then, acid complexing agents are added, ammonia water is used for regulating the pH value to be 6 to 8, next, the stirring is carried out at 60 to 90 DEG C, in addition, the water is dried through evaporation, sol-gel precursors are obtained, blocky porous loose precursors are obtained through vacuum drying, then, the ball milling, the pre-sintering, the sintering and the ball milling are carried out, and finally, the cathode material is obtained. The obtained material has the advantages that particles are more uniform and are in the nanometer level, in addition, a battery is assembled for carrying out electrochemical test, and higher capacity and excellent circulation performance are realized.

The invention belongs to the technical field of batteries, and particularly relates to an aqueous lithium (sodium) ion battery mixed negative material. The mixed negative material is prepared by mixing three materials including ion embedded type compounds, conductive materials, organic compounds capable of reversibly storing alkali metal or alkaline earth metal ions or high-molecular polymers in a certain mass proportion; a mixing way comprises the steps of in-situ growth and direct mechanical mixing of all the composition parts. An aqueous lithium (sodium) ion battery assembled by using the mixed electrode material as a negative electrode has the characteristics of long cycle life, high power, high security, low cost and no environment pollution, and is particularly suitable for power batteries used in short-distance electromobiles and energy storage batteries used in smart power grids.

The invention discloses a dual-power supply management system and a dual-power supply management method for an electric vehicle. The dual-power supply management system comprises a storage battery, a power electronic switch, a supercapacitor bank, a bidirectional DC-DC (Direct Current-Direct Current) converter and a digital signal processor, wherein the storage battery is connected to an inverter through the power electronic switch; the power electronic switch controls the charge, discharge and switching on or off of the storage battery under the control of an acquired PWM (Pulse Width Modulation) signal, the supercapacitor bank is connected to the inverter through the bidirectional DC-DC converter; the bidirectional DC-DC inverter is used for increasing or reducing the voltage in a positive direction and a negative position under the control of the acquired PWM signal; and the digital signal processor is connected with the storage battery, the supercapacitor bank, a motor, an accelerator, a brake and direct current buses among the inverter, the power electronic switch and the bidirectional DC-DC inverter to generate a PWM signal for controlling the power electronic switch and the bidirectional DC-DC inverter. According to the dual-power supply management system, the supercapacitor bank and the storage battery are used in parallel, and thus the defects that the storage battery is low in specific power, does not support a large current, and the like are effectively made up.

A lithium secondary battery comprising a positive electrode, a negative electrode comprising a carbonaceous material which is capable of absorbing and desorbing lithium ions, and a non-aqueous electrolyte disposed between the negative electrode and the positive electrode. The carbonaceous material comprises a graphite crystal structure having an interplanar spacing d002 of at least 0.400 nm (preferably at least 0.55 nm) as determined from a (002) reflection peak in powder X-ray diffraction. This larger interplanar spacing implies a larger interstitial space between two graphene planes to accommodate a greater amount of lithium. The battery exhibits an exceptional specific capacity, excellent reversible capacity, and long cycle life.

The invention discloses a high-nickel ternary positive electrode material with single crystal morphology and a preparation method of the high-nickel ternary positive electrode material. The positive electrode material is formed by a base material and a coating layer, wherein the base material is prepared from a high-nickel ternary precursor, a lithium source and a doping agent; the doping agent comprises a doping element, the doping element is a metal element, the coating layer is formed by a coating material, the coating material comprises a coating element, and the coating element is a metalelement and / or a non-metal element. The positive electrode material is obtained by mixing the high-nickel ternary precursor, the lithium source and the doping agent, performing primary sintering, then mixing with the coating material, and performing secondary sintering. The high-nickel ternary positive electrode material disclosed by the invention has the advantages of single crystal morphology,smooth surface, small specific surface area and high compaction density, and the single crystallization of the high-nickel ternary positive electrode material improves the specific capacity and cycleperformance of the positive electrode material and prolongs the service life of the positive electrode material. The preparation method is simple in process, easy to implement and beneficial to industrial large-scale production.

The invention relates to a polypyrrole-clad nano spherical zinc oxide material with a core-shell structure and a preparation method. The polypyrrole-clad nano spherical zinc oxide material takes nano spherical zinc oxide as a core and polypyrrole as a shell cladding the surface of a zinc oxide particle. The preparation method comprises the steps of adding a precipitant such as hexamine to a zinc source, preparing a nano spherical zinc oxide particle by a hydrothermal reaction, adding nano zinc oxide to a solution containing a surfactant to form zinc oxide sol, adding a pyrrole monomer and an oxidant, performing in-situ oxidation polymerization, and forming a polypyrrole-clad layer on the surface of the zinc oxide particle. The prepared polypyrrole-clad nano zinc oxide material with the core-shell structure has a larger specific surface area; the activity of the nano zinc oxide material is improved; aggregation of the nano zinc oxide particle can be well avoided; existing of the polypyrrole-clad layer effectively alleviates pine-tree crystal forming of the zinc oxide particle in charging and discharging processes; and the cycle life of an electrode is significantly prolonged.

The invention discloses a lithium battery formed on the basis of lithium nickel manganese oxide and lithium titanate and a preparation method of the lithium battery. The lithium battery comprises an aluminum-plastic film casing, an anode lug, a cathode lug and a tab film, wherein the aluminum-plastic film casing contains a battery cell and electrolyte; the battery cell comprises an anode piece, a diaphragm and a cathode piece; materials of the anode piece comprise an anode slurry coating consisting of a positive active material, a binding agent, a conductive agent and a solvent and an anode current collector; the positive active material adopts an Al2O3 coating of lithium nickel manganese oxide; the binding agent adopts one or two of polyvinylidene fluoride and polytetrafluoroethylene; the conductive agent adopts one or more of conductive carbon black, conductive graphite and carbon nanotubes; the solvent adopts N-methyl-2-pyrrolidinone; the anode current collector adopts an aluminum foil; the cathode piece adopts an aqueous cathode or an oil-based cathode. According to the designed lithium battery, the purposes of improvement of the reversible specific capacity, the energy density and the rapid charge-discharge capability, the cycle performance and the safety performance of the battery are achieved while the production cost is reduced.

The invention discloses a positive electrode material for a potassium ion battery and a preparation method thereof, and the potassium ion battery. The positive electrode material has a chemical formula of K<x>P[R(CN)<6>], wherein x is no less than 0 and no more than 2, P is a transition metal ion, and R is Fe<2+> or Fe<3+>. The preparation method comprises the following steps: dissolving potassium ferricyanide or potassium ferrocyanide and a transition metal salt to prepare a uniform solution; then carrying out a hydrothermal reaction; separating a precipitate produced in the hydrothermal reaction; and carrying out washing and vacuum drying so as to obtain the positive electrode material. The preparation method in the invention is simple in process, easy to operate, low in cost for required raw materials and suitable for large-scale industrial production. The prepared positive electrode material has an open three-dimensional network frame structure, and great interstitial sites allow potassium ions to shuttle and to be stored, so the potassium ion battery assembled from the positive electrode material has high discharge capacity, long cycle life, and high energy density and power density.

The invention provides a high-temperature-resisting lithium-ion battery membrane with a plurality of types of coatings and belongs to the technical field of battery membranes. The high-temperature-resisting lithium-ion battery membrane is prepared from a coating membrane composed of a battery membrane with one surface or double surfaces coated with coating slurry; one surface or double surfaces of the coating membrane are coated with slurry additional layers; each slurry additional layer comprises at least one layer of coating composed of the coating slurry. The invention further provides a preparation method of the high-temperature-resisting lithium-ion battery membrane with the plurality of types of coatings; the battery membrane has the advantages that a coating membrane has relatively high safety on a battery; meanwhile, the battery membrane can also be used for resisting high temperature, reducing the shrinkage rate of the membrane under a high-temperature condition and prolonging the service life of the battery; the high-temperature-resisting lithium-ion battery membrane can be used for improving the affinity of the membrane and electrolyte and can guarantee that the membrane is sufficiently swollen through the electrolyte and the service life of the battery is prolonged.

The invention relates to the technical field of rechargeable lithium ion batteries, in particular to a high-performance power battery electrode and a manufacturing method thereof. The manufacturing method is suitable for manufacturing pole pieces of a positive electrode and a negative electrode of a rechargeable lithium ion battery. The manufacturing method comprises the following steps of: coating a conductive layer without lithium storage activity on a metal foil by a water-based process first and then coating a material with the lithium storage activity on the metal foil by using an oil-system formula to obtain a power battery electrode after drying and rolling the conductive layer. The electrode manufacturing method utilizes the advantages of high acting force and low internal resistance of the water-based process and metal, utilizes the characteristics of stable process and long cycle life of the oil-system formula, reduces the using amount of a bonding agent, can greatly improve the high-rate performance and the cycle life of the battery, and is an ideal power battery electrode manufacturing method.

The invention relates to micro-power grid control method in the power system field, in particular to a power grid control method based on a battery service life model. The method comprises the steps of (1) building a battery service life model; (2) judging whether battery operation parameters are out-of-limit; (3) judging whether a micro-power grid is restrained by self-balancing degree and self-smoothing degree; (4) controlling the micro-power grid restrained by the self-balancing degree and the self-smoothing degree; (5) controlling the micro-power grid restrained by the self-balancing degree and the self-smoothing degree; and (6) adjusting battery operation parameters when the battery operation parameters are out-of-limit. According to the method disclosed by the invention, the optimization combination control can be carried out according to the operation parameters influencing the circulating service life of a battery, and therefore, the service life of an energy storage battery can be well prolonged while a power distribution grid scheduling command is responded, the investment cost for the service life of the power grid is reduced, and the effective technical support for popularizing the rapid power grid development is provided.

The invention relates to the technical field of lithium ion battery diaphragm preparation, and discloses ceramic slurry, a ceramic composite diaphragm and a lithium ion battery. The slurry comprises deionized water, ceramic particles, a thickening agent, a binder, a dispersing agent and a wetting agent, wherein the dispersing agent is an amphiphilic high-molecular compound with a comb structure. The ceramic composite diaphragm prepared from the slurry is high in thermal stability, puncture resistance and liquid absorption capacity, and the ceramic coating is not easy to fall off in an electrolyte when being used in the lithium ion battery, so that the cycling life of the battery can be prolonged, and the consistency of cells and the safety of the battery can be improved.

The invention discloses a composite metal lithium negative electrode, a preparation method and a metal lithium battery. The metal lithium negative electrode is composed of a three-dimensional currentcollector frame and a surface coating layer, wherein the three-dimensional current collector frame is used as a matrix of the composite lithium negative electrode, so volume expansion of lithium metalin the circulation process can be effectively relieved, the average current density can be reduced due to the high specific surface area, uneven deposition of lithium is further inhibited, the metaloxide nano-particle sites in a surface coating layer can form alloy with lithium metal in situ in the circulation process and further serve as reversible lithium deposition sites, polarization of lithium deposition is reduced, and uniform intercalation and deintercalation of lithium can be induced. The metal lithium negative electrode is advantaged in that a method of combining a porous skeleton and a surface lithium-philic modification layer is adopted, so a problem that it is difficult to consider the bulk phase pulverization and uneven interface growth in a lithium metal anode in the priorart is solved, and an effective thought is provided for actual industrialization of a lithium metal negative electrode.

The invention relates to a preparation method of an S-C positive pole microwave composite material of a high cycle performance lithium sulfur battery. Firstly, sulfur, carbon materials are put into a ball mill for ball-milling mixing, and then put into a microwave oven for microwave heating and compositing to prepare the S-C positive pole microwave composite material with high dispersion uniformity. The S-C positive pole microwave composite material and a conductive agent are ground and mixed uniformly, the S-C positive pole microwave composite material and a binder are dispersed in an organic solvent in a certain proportion, and stirred to prepare paste, and then the paste is evenly coated onto a current collector sheet, and dried to prepare a positive pole. The preparation method adopts an advanced microwave heating method, has the advantages of fast heating speed, mild conditions and high efficiency, the prepared positive pole composite material is stable in structure, the battery has good cycle stability, at the same time, the commercial carbon material with low price is used, the material cost is greatly reduced, and the preparation method is suitable for popularization.

A rechargeable lithium ion button cell battery having a sealed housing comprises an inner casing and an outer casing, both casings have at least one flat area as top or bottom of the battery, and a round or oval sidewall vertically formed to the flat area. An insulation gasket is positioned between said sidewalls, and the outer casing opening is mechanically crimped to complete the seal of the battery. Inside the sealed housing the anode and cathode electrodes are spiral wound with separator to be a round or oval roll. Said roll axis is vertical to the said flat areas of the casings. The two electrodes are tapered in width to fully utilize the inner space. The electrodes comprise current collectors of metal foils coated with lithium-intercalating active materials, leaving small area of uncoated metal foils as conductor tabs for connecting the electrodes to the casings. The tabs could be welded or by tight contacting to the casings, in several options. Insulation washers or tapes are applied to the naked metal surfaces of the electrodes or casings inside of the housing to prevent short circuit and enable the battery to have longer cycle life.

The invention discloses a lithium ion battery and a positive electrode piece thereof. The positive electrode piece comprises a positive electrode current collector, a priming coat coated on the positive electrode current collector and a positive electrode diaphragm coated on the priming coat, the positive electrode current collector is aluminum foil, and the positive electrode diaphragm contains a positive electrode active material and a PVDF homopolymer binder; and the priming coat comprises a conductive agent and acrylic acid modified polyvinylidene fluoride copolymer (Ac-PVDF) used as a binder. The priming coat is introduced to the positive pole electrode piece of the lithium ion battery, the priming coat mainly contains the acrylic acid modified polyvinylidene fluoride copolymer and the conductive agent, the Ac-PVDF can significantly increase the adhesion between the positive electrode diaphragm and the positive current collector, and the conductive agent can reduce the interface resistance, so the charge and discharge performance of the battery is improved, and the cycle life of the battery is prolonged.

The invention discloses water-based cutting fluid for metal processing and a preparation method of the water-based cutting fluid. The cutting fluid mainly consists of a lubricating agent, a metal antirust agent, an anti-wear reagent at extreme pressure, a nonionic surfactant, a dispersing agent, an antifoaming agent and water, and the cutting fluid comprises the following components in percentage by weight: 8-12 percent of oleic acid, 1.8-2.5 percent of triethanolamine, 0.3-0.6 percent of boric acid, 0.2-0.5 percent of benzotriazole, 5-8 percent of sodium carbonate, 10-12 percent of polyethylene glycol, 0.2-0.5 percent of dodecylphenol polyoxyethylene ether (OP-10), 0.7-1 percent of glycine betaine, 0.5-0.8 percent of glycerin polyoxypropylene ether and the balance of water. According to the water-based cutting fluid disclosed by the invention, the problems that the conventional water-based cutting fluid is poor in antirust and lubricating performances, low in recycling period and harmful to the human and environment are solved, and the aims of improving the lubricating effect and the antirust performance, realizing harmlessness to the environment and a human body and reducing the production cost of metal processing are achieved by virtue of synthesis of polybasic esters.

The invention relates to a pulse charging method used for prolonging VRLA battery service life. The invention aims at provides a pulse charging method used for prolonging VRLA battery service life, such that the service life of a valve-regulated lead acid battery is prolonged. The invention adopts a technical scheme that, a VRLA battery has an output voltage of U and a capacity of C. The method is characterized in that the method is preceded in three sections which are a section A, a section B, and a section C. In the section A, constant-current charging is carried out with a charging limited current I. In the section B, periodic-change charging is carried out with constant current of the limited current I and constant-voltage of a second charging voltage U2. In the section C, periodic-change charging is carried out with constant-voltage of a first charging voltage U1 and constant-voltage of the charging voltage U2. In the section A, when a voltage is increased to U1, the process turns to the section B. In the section B, when the battery is charged to almost full, the process turns to the section C. The invention is suitable to be used in a field of storage battery charger.

The invention discloses a high-performance lithium ion secondary battery. The active substance of the anode of the battery is lithium-containing compound oxide of the chemical formula: LiFe(1-y)MyPO4, wherein M is one element selected from Co, Ni, Mn, Al, S, Ca, K, Na, Mo and Cr, y is more than 0 but less than or equal to 0.75. A water-soluble polymer is used as an adhesive. The anode of the inventive lithium ion secondary battery is prepared by mixing LiFe(1-y)MyPO4 compound with the water-soluble polymer at a given weight ratio, adding a conductive substrate and water as an solvent, mixing, stirring and filtering to obtain a homogenous slurry, coating the flurry on the surface of an aluminum foil, drying at 55-150 DEG C to obtain an anode piece, winding together with a cathode piece, assembling, infusing, standing, pre-charging with a 0.01C-0.65C current, standing again, and fractioning volumes. The inventive high-performance lithium ion secondary battery has the advantages of good property of high-current charge and discharge, long cycle life, high safety, environmental friendliness, and low cost.

The invention discloses a method for manufacturing battery negative pole piece, including drying and rolling, which is characterized in that the sizing before drying and rolling is continuous sizing, and adopting one-sided sizing at the no-powdering part of the cathode pole piece contacted to the steel shell. Compared with the prior art, the invention has beneficial effects that the inventive method adopts using steel belt matrix to position at the center of the smear paste die clearance, performs powder scraping continuous operation before pole piece rolling, which is in favor of reducing alloy oxidation of pole piece in the production process and impurity introduction in the pole piece, and is in favor of improving the consistency of pole piece production quality and production efficiency of the pole piece.

The invention belongs to the field of catalytic materials, and particularly relates to a three-dimensional graphene / carbon nano tube based molybdenum disulfide / cobaltous sulfide composite material electrocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: step I, treating a precursor: performing ultrasonic treatment on a certainamount of oxidized graphene and a modified carbon nano tube, adding ascorbic acid, thiourea and a metal ion precursor to be uniformly mixed, wherein the metal ion precursor is sodium molybdate and cobalt chloride; step II, performing a hydrothermal reaction process: transferring mixed composite into a reaction kettle, heating the composite to a temperature of 160-200 DEG C, reacting for 20-28 hours at the temperature, conducting cooling to the room temperature to obtain a gel-like black substance, and conducting washing and freeze-drying to obtain a cylindrical black solid. A graphene / carbonnano tube with a three-dimensional network structure provides a quick electron transfer path and an ion transport channel, and molybdenum disulfide / cobaltous sulfide with a nano structure is anchoredon three-dimensional structural carbon to expose more electro-active sites, so that electrochemical hydrogen evolution property is cooperatively improved.

The invention discloses a hybrid energy storage control method suitable for voltage control of an off-grid type DC microgrid. The system consists of a supercapacitor, a storage battery, and respective bidirectional DC-DC converters. The method comprises the steps that a supercapacitor energy storage system employs voltage-power sag control, and maintains the stable voltage of a DC microgrid bus; a storage battery energy storage system carries out the real-time estimation and adjustment of the remaining capacity of the supercapacity according to the voltage change of the DC bus, and indirectly carries out the compensation for the non-instantaneous power fluctuation in the system. The beneficial effects of the invention are that the system gives play to the performance advantages of all energy storage devices in the system, improves the sustainable adjustment capability of the supercapacitor, and enables the current of a storage battery to be smooth.

The invention discloses an energy storage system and an energy storage method based on a communication base station, relates to the communication field, and can improve the service life of the energy storage system so that operation cost of the communication base station is reduced and investment return rate is improved. The energy storage system comprises a first energy storage unit including a plurality of lithium ion batteries; a second energy storage unit including a plurality of lead-acid batteries; a switch unit including two switch ends and a control end, and a monitoring unit; wherein one switch end of the switch unit is two switch points which are connected with the first energy storage unit and the second energy storage unit respectively, and the other switch end of the switch unit is connected with a power supply system and a base station load of the communication base station; the output end of the monitoring unit and the control end of the switch unit are connected to input control signals, the monitoring unit is used for controlling the switch unit to switch according to whether the monitored power supply system is charged and storage condition of the first energy storage unit, so that charging and power supply of the energy storage system are achieved.

The present invention provides a battery, which comprises a positive electrode, a negative electrode and a water-based electrolytic solution, wherein the positive electrode comprises a positive electrode active substance and a positive electrode current collector, the water-based electrolytic solution comprises a first metal ion and / or a second metal ion, the first metal ion can be reversibly removed from-embedded into the positive electrode during a charging and discharging process, the second metal ion is subjected to reduction deposition at the negative electrode during a charging process to form a second metal, the second metal is oxidized and dissolved during a discharging process to form the second metal ion, the negative electrode comprises a negative electrode substance having a porous structure, and the negative electrode substance comprises a zinc active substance and a negative electrode binder. According to the present invention, the dendritic crystal problem of the battery negative electrode can be effectively improved, the cycle life of the battery can be increased, and the electrochemical performance and the safety performance of the battery can be improved.

The invention provides a safety layer and a lithium secondary battery. The safety layer is used for separating a positive electrode sheet and a negative electrode sheet, and comprises at least two layers of electrically insulating ion conducting layers and at least an absorption layer, wherein the absorption layer is positioned between each two adjacent two electrically insulating ion conducting layers, one sides respectively close to the positive electrode sheet and the negative electrode sheet are the electrically insulating ion conducting layers in the safety layer, the absorption layer comprises a substance capable of reversibly deintercalating lithium, and the conductivity of the absorption layer is not less than 10<-1> S / m. According to the present invention, after the safety layer is applied in the lithium secondary battery, the growth of the dendritic lithium can be effectively alleviated, the risk of the short circuit of the lithium secondary battery in various extreme and complicated environments is reduced, the cycle life of the lithium secondary battery is prolonged, and the safety performance of the lithium secondary battery is increased; and the safety layer cannot reduce the energy density of the lithium secondary battery.

This invention relates to coatings for a metal or non-metal substrate comprising (i) a thermal sprayed bondcoat layer applied to said substrate comprising an alloy of MCrAlM′ wherein M is an element selected from nickel, cobalt, iron and mixtures thereof, and M′ is an element selected from yttrium, zirconium, hafnium, ytterbium and mixtures thereof, and wherein M comprises from about 35 to about 80 weight percent of said alloy, Cr comprises from about 15 to about 45 weight percent of said alloy, Al comprises from about 5 to about 30 weight percent of said alloy, and M′ comprises from about 0.01 to about 1.0 weight percent of said alloy, said alloy thermally sprayed from a powder having a mean particle size of 50 percentile point in distribution of from about 5 microns to about 100 microns, said bondcoat having a surface roughness of at least 200 micro-inches, and said bondcoat having a thermal expansion of about 6.5 millimeters per meter or less between a temperature of from about 25° C. to about 525° C., and (ii) a thermal sprayed ceramic layer applied to said bondcoat layer; wherein said coating has a helium leak rate of less than 6×10−6 standard cubic centimeters per second. The coatings are useful for extending the service life under severe conditions, such as those associated with metallurgical vessels' lances, nozzles and tuyeres.

The invention discloses a self-lifting method for a large scale steel structure supporting platform in a limited space, and the method bases on a self-lifting steel structure supporting platform. The self-lifting steel structure supporting platform comprises a sliding orbit composed of two joist steels or steel rail which are arranged in parallel and a plurality of self-lifting steel structure sliding measure supports arranged on the sliding orbit side by side; each self-lifting steel structure sliding measure support comprises a base, standard mast sections, a platform beam adjusting section and a lifting frame. Operation steps comprise that quantity of needed self-lifting steel structure sliding measure supports is measured, then the sliding orbit and the base are installed, and N of the standard mast sections, the platform beam adjusting section and the lifting frame are installed on each base in sequence. According to the requirement for construction height, a rectangular ring beam is lifted to a pointed elevation position by one of the top lifting frame and is fixed. According to the self-lifting steel structure supporting platform and the self-lifting method, lifting work of a large scale supporting structure can be conducted by fully relying on manpower, mounting and dismounting are convenient, efficiency is high, needed materials are less, cost is low, and cycle use can be achieved.