32results about How to "Solve the problem of concentration polarization" patented technology

The invention discloses a thick electrode with a good electrochemical performance. The electrode comprises a current collector and an electrode membrane containing active substances and conductive substances. With a thickness greater than 300 micrometers, the electrode membrane includes an internal membrane layer close to the current collector and an external membrane layer far from the current collector. The conductivity of the electrode membrane decreases from the internal membrane layer to the external membrane layer, while the porosity of the electrode membrane increases from the internal membrane layer to the external membrane layer. The internal membrane layer has great conductivity which can make electrons at the current collector entering or separating from the internal membrane layer rapidly. With great porosity, the external membrane layer can adsorb a lot of electrolyte, thus solving the problem of poor electrolyte wettability of thick electrodes. In addition, the invention also discloses a preparation method of a thick electrode with a good electrochemical performance.

The invention discloses a novel solid-state electrolyte membrane material capable of being used as a lithium ion battery as well as a preparation method and application thereof. The material is a segmented copolymer containing a polyfluorosulfimide based lithium salt and a polyethylene oxide structure and the molecular structure is shown in the formula (I). The method comprises the following steps: mixing a fluorine-containing monomer and polyethylene oxide and dissolving into dry acetonitrile; adding an acid-binding agent and reacting at 0-100 DEG C for 1-10 days to obtain a polymer in a form of metal ion salt; dissolving the polymer in the metal ion salt form into an organic solvent; and adding LizX to carry out a lithium ion exchange reaction to obtain a polymer in a lithium salt form. The material can be used as a battery solid electrolyte material to be applied to preparation of the lithium ion battery. The material is used as solid electrolyte and has a better application prospect in terms of inhibiting the growth of lithium dendrites in the lithium ion battery, improving the transference number of lithium ions and ensuring high conductivity at room temperature and stable battery circulation.

The invention relates to the technical field of aluminum electrolysis, in particular to a composite anode of an aluminum electrolytic cell. In order to overcome the defect of the mode that raw materials are added into a liquid electrolyte in the electrolytic cell separately, according to the adopted technical scheme, filler is added to an aluminum frame with a built-in conductor, and the filler comprises the raw materials; the raw materials are aluminum oxides used for preparing metal aluminum or aluminum oxides and corresponding alloy element oxides or alloy element fluorides for preparing aluminum alloy; and the raw materials are directly added into the composite anode, the raw material adding modes and the raw material adding areas are increased, thus, the raw materials continuously andslowly enter and disperse in the large-area electrolyte area simultaneously, even under the low electrolysis temperature condition, the raw materials added in the liquid electrolyte can be rapidly and completely dissolved, less precipitation is generated at the furnace bottom, the low electrolysis temperature is adopted for operation, heat losses of the electrolytic cell can be reduced, the current efficiency is improved, the yield is increased, carbon consumption is reduced, energy consumption is reduced, and emission of fluorine-containing gas is reduced.

The invention belongs to the technical field of lithium ion batteries and particularly relates to a single-ion polymer electrolyte, a preparation method thereof, a single-ion polymer electrolyte membrane and a lithium ion battery. The single-ion polymer electrolyte comprises polymer chains formed by structure units represented by formula 1 (shown in the description), wherein membrane supporting groups are linked between the two polymer chains, and two ends of the membrane supporting groups are respectively connected to sites 1 or 2 of the structure units; lithium ion providing groups are connected to the sites 1 or 2 of the structure units; the lithium ion providing groups and the membrane supporting groups are respectively connected to the site 1 or 2 of each independent structure unit; and the molar ratio of the lithium ion providing groups to the membrane supporting groups is 1 to (1-2). The single-ion polymer electrolyte has the advantages of high room temperature conductivity, mechanical strength and flame retardance and the like and further has very considerable application prospects in the field of the lithium ion batteries.

The invention belongs to the technical field of copper electrolysis smelting, and particularly relates to a device and method of industrially carrying out magnetized copper electrolysis. The device comprises a permanent magnet device, a transition tank, an electrolytic tank, a low tank, an elevated tank and a steam heating device. According to the device and method, the large-scale and high-efficiency utilization of the copper magnetic electrolysis technology is achieved by the bypass cycle of a magnetic treatment device, and the magnetic treatment efficiency can be improved in the mode that an electrolyte passes through the permanent magnet device at the high speed. The loren magnetic force borne by the electrolyte in the process that the electrolyte passes through the magnetic field canbe enhanced, the electrolyte is greatly activated, the impurity flocculating setting is reinforced, the clarity of the electrolyte is improved, cathode copper crystal grains are refined, the number ofbubbles in the electrolyte is reduced, and the problem that due to the facts that the air bubbles in the electrolyte are prone to having a reaction on the surface of an anode to generate an oxide film, and anodic passivation happens, the cathode copper quality is affected is solved.

The invention discloses an improved rotating membrane sewage filtration device, which comprises a rack, a filter box, a first rotating shaft, a motor and a filter cartridge. A plurality of filter holes are formed on the circumferential wall of the filter cartridge, the outer circumferential wall of the filter cartridge is fixedly sleeved with a membrane member, the left side wall of the filter cartridge is connected to a liquid inlet tank, the bottom side wall of the filter box is provided with a liquid outlet, the right end side wall of the filter cartridge is provided with a slag outlet, a second rotating shaft in transmission connection with the first rotating shaft is mounted on the filter box, the second rotating shaft is equipped with a gear able to rotate synchronously therewith, and engaging teeth engaged with the gear are formed on the right side of the filter cartridge. The right end of the slag outlet is connected to a convergent cylinder, a rubber sleeve is inserted in the convergent cylinder, the right end of the rubber sleeve is connected to a plurality of petals, and each petal is equipped with an adjustment unit. The improved rotating membrane sewage filtration device provided by the invention well solves the concentration polarization and membrane pollution problems of the membrane surface, significantly increases the membrane permeation flux, and greatly improves the membrane separation performance.

The invention provides a method for preparing a Ni-SiC composite coating on the inner surface of a hollow workpiece. By means of a cyclic electroplating solution code position technology, an electroplating solution only makes contact with the inner surface of the hollow workpiece, and only the composite coating is deposited on the inner surface of the hollow workpiece without affecting the status of the outer surface of the hollow workpiece. The SiC content of the composite coating prepared in the composite electroplating solution with the SiC concentration being 20 g/L reaches up to 18.8%vol, and the utilization rate of SiC is effectively increased. The deposition rate of the Ni-SiC composite coating reaches up to 83 microns per 30min. Compared with a pure nickel coating, the Ni-SiC composite coating is low in surface roughness, uniform and compact and has the characteristics of high hardness, high abrasion resistance and high corrosion resistance. Through the method, the problem of concentration polarization of a composite electroplating solution in an immersion type electroplating system is effectively solved.

The invention relates to a method for treatment of electroplating chromium-containing wastewater by periodic polarity reversal. The method adopts the steps of: adjusting the pH of electroplating chromium-containing wastewater to 5-7 and the conductivity to 500-2000micros/cm, then inserting pole plates, introducing direct current, carrying out electrocoagulation reaction and periodically reversing the pole plate polarity to electrolyze wastewater, then letting the mixed solution enter a sedimentation tank, recycling the supernatant, and using the precipitated floc as the raw material for preparation of alloy. Compared with the prior art, periodic polarity reversal adopted by the invention can make anode dissolved metal ions better diffuse into water, improves the mass transfer efficiency, alleviates concentration polarization, and can overcome the problems of low current efficiency, electrical energy waste, low treatment efficiency and the like caused by passivation, in addition by a mixed anode method, iron and aluminum metals can be dissolved at anode simultaneously, the floc undergoes coprecipitation, the flocculation effect is better, the effluent water is clear and transparent, has a chromium content of less than 0.01mg/L, and is recyclable.

The invention discloses a two-stage rotating purification device. The two-stage rotating purification device comprises a fixing frame, a casing, a rotating drum, a filtering drum and a first motor, wherein multiple first filtering holes are formed in the circumferential wall of the rotating drum, a first membrane piece is mounted on the outer circumferential wall of the rotating drum in a sleeve manner, a liquid outlet is formed in the bottom of the casing, an end cover is detachably connected with the right end of the rotating drum, a first rotating shaft is fixedly connected onto the end cover and connected with an output shaft of the first motor, a mounting hole is formed in the left end side wall of the rotating drum, the filtering drum is communicated with the rotating drum via the mounting hole, the side wall of the filtering drum is connected with a liquid inlet pipe, a filtering plate is inserted and mounted in the filtering drum, multiple second filtering holes are formed in the filtering plate, second membrane pieces are fixedly mounted on the upper surface and the lower surface of the filtering plate, and a positioning groove where the head end of the filtering plate is inserted and mounted is formed in the inner side wall of the filtering drum. With the adoption of the two-stage rotating purification device, problems of concentration polarization of membrane surfaces and membrane pollution can be well solved, and the purification effect of the device is significantly improved.

The invention relates to a single ion polymer electrolyte, a single ion polymer electrolyte composite film and a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The single ion polymer electrolyte comprises a polymer chain composed of structural units, 1# or 2# position of the structural unit of the polymer chain is connected with alithium ion providing group and a lithium ion conductive group, and the molar ratio of lithium ion providing group to lithium ion conductive group is 1: (0.5 to 2). The uniform distribution of a lithium source of the single ion polymer electrolyte composite film ensures the integral electrical conductivity of the single ion polymer electrolyte composite film. The oxirane group and the lithium phosphate group of the single ion polymer electrolyte composite film provide the electrolyte with good electrical conductivity, flame retardancy and high mechanical properties. The single ion polymer electrolyte composite film has potential application value in the lithium ion batteries.

The invention discloses an eccentric rotating film filtering device which comprises a fixed shell, a rotating sleeve, a motor and a filter cartridge, wherein the rotating sleeve is rotationally arranged on the top of the fixed shell; the motor is used for driving the rotating sleeve to operate; the filter cartridge is positioned in a cavity of the fixed shell; the upper end of the filter cartridge is open, and the filter cartridge is of a hollow structure; multiple filtering holes are formed in the peripheral side wall of the filter cartridge; a film piece of which the outline is matched with the outline of the filter cartridge is fixedly arranged on the peripheral wall of the filter cartridge in a sleeving manner; a liquid inlet facing the opening of the filter cartridge is formed in the top of the fixed shell; a liquid outlet pipe is arranged at the bottom of the fixed shell; two sides of the bottom of the rotating sleeve downwards extend to form two connecting rods; the filter cartridge is hinged to the two connecting rods; and the mass center of the filter cartridge deviates from the center line of the rotating sleeve. According to the device disclosed by the invention, the phenomena of concentration polarization of the film surface and the film pollution can be well avoided, the permeation flux of the film is obviously improved, and the film separation performance is greatly improved.

The invention relates to a butterfly type separating and filtering system and method. The system comprises a feeding hole which is used for inputting liquid, a transmission module connected with the feeding hole and used for rotating the butterfly type separating and filtering system, a rotary drum module and an overflow hole. The rotary drum module is connected with the transmission module and is provided with butterfly-shaped parts and a rotary drum wall, the butterfly-shaped parts are mutually nested, a certain gap is formed between the butterfly-shaped parts, and the rotary drum module is used for separating and filtering liquid; and the overflow hole is connected with the rotary drum module and used for discharging the separated and filtered liquid, by means of the butterfly type separating and filtering system and method, the problem of concentration polarization is solved, the cleaning and maintenance cost of a membrane is reduced, the service life of the membrane is prolonged, and the production efficiency of liquid separation and filtration is greatly improved.