49 results about "Stannous sulfate" patented technology

The invention discloses a polyamide composite material as well as a preparation method and application thereof, and relates to the technical field of engineering plastics. The invention provides a polyamide composite material. The polyamide composite material is prepared from the following components in parts by weight: 20 to 80 parts of polyamide resin, 5 to 60 parts of syndiotactic polystyrene, 0.1 to 3 parts of stannous mono-sulphate, 0 to 35 parts of reinforcing filler and 0.05 to 6 parts of compatilizer. According to the polyamide composite material provided by the invention, the syndiotactic polystyrene and the stannous mono-sulphate are cooperated, so that the mechanical property and the heat-resistant stability of the polyamide composite material are further improved.

The invention discloses a preparation method of a polymer carbon nitride / tin sulfide (PCN (at) SnS2) heterojunction photoanode, which comprises the following steps of: constructing the PCN (at) SnS2 heterojunction photoanode in situ on a conductive substrate (FTO) by combining an electrochemical deposition method and a chemical vapor deposition method, adding anhydrous stannous chloride into ethanol for dissolving, spin-coating stannous ions on the surface of the conductive substrate, and oxidizing in an air atmosphere; the preparation method comprises the following steps: adding stannous sulfate and sodium citrate into deionized water, and stirring for dissolving; the prepared conductive substrate is used as a working electrode, and a tin film is deposited on the surface of the conductive substrate by adopting a three-electrode system; dicyandiamide, cyanuric acid and potassium thiocyanate are ground and mixed evenly and then put into a porcelain boat, and the conductive substrate deposited with the tin film is placed on the surface of the precursor and wrapped with aluminum foil; placing the porcelain boat in a tubular furnace, reacting in a nitrogen atmosphere, and cooling to room temperature to form PCN-coated SnS2 on the surface of the FTO. The method improves the problems of insufficient light absorption range and high electron-hole recombination rate of the polymer carbon nitride material, and has the advantages of simplicity, controllability and the like.

The invention discloses an environment-friendly hybrid film forming agent as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing an L-cysteine solution and an environment-friendly metal salt solution; the metal salt is selected from one of vanadyl sulfate, stannous sulfate, neodymium nitrate, yttrium nitrate and cerium nitrate; and mixing the L-cysteine solution and the metal salt solution to obtain a mixed solution, and adjusting the pH value to 4-4.5 to obtain the environment-friendly hybrid film forming agent. L-cysteine serves as a main body and is matched with non-toxic metal ions to prepare the hybrid film forming agent, the L-cysteine forms a Cu-S bond with the surface of metal copper through sulfydryl and is adsorbed on the surface of the copper, carboxyl and amino in the L-cysteine can be coordinated with the added metal ions, and the metal ions are adsorbed on the surface of the copper; a film which is more compact and more excellent in performance is formed on the surface of the protected metal copper; through coordination of metal ions and amino acid functional groups, the driving force of the film-forming agent is larger than that of a pure environment-friendly organic film-forming agent, and the film-forming effect is better.

The present invention relates to a corrosion gel for weld detection, a preparation method, a corrosion method and a weld surface crack detection method, belonging to the technical field of weld detection. The corrosion gel for weld detection comprises the following raw materials: agar, water, 98% sulfuric acid, 10% hydroxylamine hydrochloride solution, p-tolylthiourea, stannous sulfate, thiourea, 10% Triton X-100 solution and 0.05% ethanol solution of o-phenanthroline derivative. The preparation method of the corrosion gel for weld detection comprises the following steps: weighing agar and dissolving it in water; sequentially adding 98% sulfuric acid, hydroxylamine hydrochloride solution, p-tolylthiourea, stannous sulfate, thiourea, Triton X-100 solution and ethanol solution of o-phenanthroline derivative; adding 100 mL of ethanol solution of o-phenanthroline derivative and mixing evenly to obtain a hot corrosion gel. A weld surface crack detection method comprises the following steps: making an indicating electrode; preparing a corrosion gel; treating the weld with the corrosion gel; evaluating the weld crack.

The invention relates to the technical field of a lead-acid storage battery electrolyte, and provides a lead-acid storage battery electrolyte composite additive, an electrolyte and a preparation method thereof. The electrolyte composite additive is prepared from the following components: hexadecyl trimethyl ammonium bromide, stannous mono-sulphate, organic sodium phosphonate and 1, 8-diazabicyclo [5.4. 0] undec-7-ene. The electrolyte composite additive provided by the invention solves the problems of fast battery capacity fading and short battery life of a lead-acid battery in a low-temperature environment, and improves the low-temperature resistance of the lead-acid battery.

The invention belongs to the technical field of lead-acid storage batteries, and particularly relates to a composite additive and application thereof in a lead-acid storage battery. The composite additive disclosed by the invention is prepared from the following components in parts by weight: 0.3 to 2 parts of short fibers, 0.05 to 4 parts of graphite, 0.01 to 3 parts of antimony trioxide, 0.01 to 3 parts of stannous mono-sulphate, 0.02 to 5 parts of 4BS and 0.02 to 5 parts of a TiB2 (at) rGO composite guide material. The composite additive provided by the invention is environment-friendly, and is applied to a paste mixing process to further prepare a lead-acid storage battery, so that the utilization rate of the battery is improved, and the service life of the battery is prolonged.

The invention discloses a nano spherical SnPd oxide, which is prepared by the following steps: firstly, cross-linking tannic acid and formaldehyde at room temperature by taking F127 as a surfactant, then adding stannous sulfate and palladium nitrate dihydrate for chelation, carrying out hydrothermal reaction to obtain a SnPd phenolic hybrid, and finally, calcining to obtain the nano spherical SnPd oxide, namely SP for short. SP is an n-type semiconductor, and the chemical composition of SP is SnO2 and Pd; the diameter of the mesoporous nanosphere is 100-150nm, and the average pore size of the mesoporous nanosphere is 5-7nm. The preparation method comprises the following steps: 1, preparing the SnPd phenolic hybrid SPZ; 2, preparation of an SnPd oxide SP; according to the SP-based hydrogen sensor and the preparation method thereof, the response value is 14.6, the response time is 1.5-2 seconds, the recovery time is 7-10 seconds, and the minimum hydrogen concentration detection is 0.2 ppm; the cycling stability reaches 30 days; the catalyst has selectivity on ammonia gas, methane, carbon dioxide, carbon monoxide and nitrogen dioxide.

The invention discloses a lead-sodium battery in the field of battery technology, comprising a positive plate, a negative plate, and an electrolyte: the positive plate comprises a positive lead paste and a positive grid, the positive lead paste comprises 100 parts of lead oxide powder, 6 to 12 parts of sulfuric acid, 5 to 15 parts of deionized water, 0.05 to 0.1 parts of short fibers or conductive graphite fibers, and 0.4 to 2 parts of a mixture; the negative plate comprises a negative lead paste and a negative grid, the negative lead paste comprises 100 parts of lead oxide powder, 6 to 12 parts of sulfuric acid, 5 to 15 parts of deionized water, 0.05 to 0.1 parts of short fibers or conductive graphite fibers, and 0.4 to 2 parts of a mixture. The invention discloses a lead-acid battery comprising: a first electrolyte solution comprising 0.01 to 0.6 parts of silicon dioxide, 30 to 50 parts of 98% anhydrous concentrated sulfuric acid, 2 to 7 parts of a sodium compound, 0.1 to 0.15 parts of stannous sulfate, 0.5 to 0.8 parts of phosphoric acid, 1 to 2 parts of vanillin, and 40 to 60 parts of deionized water. The lead-acid battery can effectively achieve good low-temperature resistance and extend the service life of the battery.

The invention discloses a method for pyrolyzing organotin waste at low temperature and simultaneously preparing stannous sulfate, belonging to the technical field of organotin waste treatment. The method is to place the organotin waste in a tube roasting furnace, pyrolyze it under an oxidation atmosphere with an O2 volume concentration of 15-25% and a temperature of 400-600 °C. The solid product obtained by pyrolysis is leached with sulfuric acid, and the obtained leaching solution is subjected to impurity removal and concentrated crystallization to obtain a stannous sulfate product. This method uses organotin waste as a raw material to prepare a high-purity stannous sulfate product with high added value, realizing the resource utilization of hazardous waste, reducing the treatment cost while improving the recycling efficiency of tin resources, and providing a new way for the green and harmless disposal and efficient recovery of organotin waste.

The invention discloses a method for preparing a high-efficiency twinned copper-tin alloy catalyst based on a pulse electrodeposition-annealing process. The method comprises the following steps: step 1, preparing an acidic electrolyte containing copper sulfate, stannous sulfate and sulfuric acid, depositing the copper sulfate, stannous sulfate and sulfuric acid on a predetermined deposition substrate using a pulse electrodeposition technique, and preparing a high-quality twinned copper-tin electrocatalyst foil with controllable density in the acidic electrolyte under a predetermined pulse electrodeposition cycle, a predetermined pulse time, a predetermined duration, a predetermined pulse current density and a predetermined counter electrode; and step 2, placing the twinned copper-tin catalyst foil in a low-pressure, high-vacuum annealing furnace, and performing an annealing treatment under inert or reducing atmosphere protection at a predetermined annealing temperature and for a predetermined annealing time to obtain a high-efficiency twinned copper-tin alloy catalyst.

The invention belongs to the technical field of electrolytic copper foil production, and particularly relates to a high-strength VLP copper foil for an ultra-high refined PCB and a preparation method of the high-strength VLP copper foil. The method comprises the following preparation steps that an additive is added into a copper sulfate electrolyte, the additive comprises stannous mono-sulphate, trisodium citrate and phytic acid, and an electrodeposition electrolyte is obtained; carrying out electro-deposition on the obtained electrolyte on the surface of a cathode roller to obtain a raw foil with a tuberization effect, wherein the rough surface roughness Rz of the raw foil is 1.5-2.5 microns; and sequentially carrying out anti-oxidation treatment and coupling agent treatment on the obtained crude foil to obtain the high-strength VLP copper foil. The special additives are added into the electrolyte, so that the prepared raw foil has a nodulation effect, and the nodulation treatment procedures such as coarsening and curing in the surface treatment process are not needed; the VLP copper foil of which the roughness, the tensile strength and the peel strength all meet the requirements for ultra-high refinement PCB manufacturing can be obtained through one-step electro-deposition.

The invention discloses a chemical tin solution for a flexible printed circuit board, and belongs to the technical field of circuit boards. The chemical tin solution comprises stannous mono-sulphate, methanesulfonic acid, a reducing agent, thiourea, a complexing agent, phytic acid, disodium ethylene diamine tetraacetate, an active agent, lanthanum chloride and a fluorine-substituted benzimidazole protective agent. Compared with the prior art, a hydrophobic network constructed by the fluorine-substituted benzimidazole protective agent effectively blocks environmental moisture permeation, the salt mist resistance and the tin immersion thickness of a chemical tin solution are improved, the grain boundary structure is synergistically optimized through the rare earth metal additive and the composite complexing agent, the compactness and the uniformity of a plating layer are remarkably improved, and the corrosion resistance of the plating layer is improved. And the fine-pitch wiring requirement is met. In addition, uniform nucleation of tin ions can be promoted, growth of tin whiskers is inhibited, a high-flatness coating is achieved, local micropores and cracks are reduced, and the method has high reliability and good application prospects.

The invention provides a chemical tinning agent, a preparation method thereof and application of the chemical tinning agent in preparation of solar cells, and relates to the technical field of photovoltaic cell manufacturing, and the chemical tinning agent comprises the following components: main salt, a second reducing agent and a second composite complexing agent; the main salt comprises stannous mono-sulphate, copper sulfate and sodium persulfate; the second composite complexing agent comprises one or more of sodium gluconate, citric acid and glutamic acid. The invention solves the problems of high energy consumption, noble metal dependence, poor uniformity, poor adhesive force and the like in the traditional chemical plating process, realizes low energy consumption and high productivity, ensures that the grid line has good adhesive force and uniformity, prolongs the service life of the plating solution, and reduces the maintenance cost.

The application relates to the technical field of lead-acid battery electrolyte, and discloses a lead-acid battery electrolyte composite additive, an electrolyte and a preparation method thereof. The electrolyte composite additive comprises the following components: hexadecyl trimethyl ammonium bromide, stannous sulfate, an organic phosphonic acid sodium salt and 1,8-diazabicyclo[5.4.0]undec-7-ene. The electrolyte composite additive solves the problems of fast battery capacity attenuation and short battery service life of the lead-acid battery in a low-temperature environment, and improves the low-temperature resistance of the lead-acid battery.

The invention discloses positive lead paste with high active substance utilization rate and a preparation method thereof, and relates to the technical field of positive lead paste of lead storage batteries. The positive lead paste comprises 100 parts of lead powder, 6 to 8 parts of red lead, 0.1 to 0.2 part of graphite, 0.1 to 0.2 part of stannous mono-sulphate, 0.05 to 1 part of antimony trioxide, 0.2 to 0.8 part of short fiber, 0.1 to 0.2 part of sulfonic polythiophene derivative additive, 5 to 15 parts of sulfuric acid and 1 to 10 parts of water. By adding the sulfo polythiophene derivative as an additive, the prepared positive lead paste has good electrochemical oxidation-reduction performance, and can promote the improvement of the conversion efficiency of positive active substances, effectively reduce the resistance of a lead-acid battery, improve the initial performance of the lead-acid battery and prolong the cycle life of the lead-acid battery when being applied to the lead-acid battery; and contributions are made to the development of lead-acid batteries.

The invention discloses a long-life light-weight lead-acid storage battery, and belongs to the technical field of lead-acid storage battery manufacturing. The positive pole plate of the lead-acid storage battery is prepared by coating a Pb-Ca-Sn-Al stamping grid with positive lead plaster containing stannous mono-sulphate and antimony trioxide; the lead-acid storage battery is subjected to reverse charging before formation, Sb and Sn in lead paste are generated on the surface of a positive grid through electro-deposition, then internal formation is completed through charging and discharging, and finally large-current charging activation is conducted. In the manufacturing process of a polar plate and the forming process of an active substance, a positive electrode is converted into a negative electrode by utilizing a reverse charging electrochemical formation process, and Sb < 2 + > and Sn < 2 + > in positive electrode lead paste are subjected to a cathode electrolytic reduction reaction to generate Sb and Sn metals, so that the Sb and Sn in the positive electrode lead paste are electrodeposited on the surface of a grid in one step, then normal formation is carried out, and then high-current charging activation is carried out; the interface structure is further improved and the service life of the battery is prolonged.

The application belongs to the technical field of batteries and electric power, and discloses a storage battery activating liquid for a transformer substation, which is characterized by being composed of sodium sulfate, sodium chloride, calcium phosphate, magnesium phosphate, cobalt sulfate, cadmium sulfate, stannous sulfate, copper sulfate, zinc sulfate, nickel sulfate and aluminum sulfate solution. The application also discloses a storage battery activating method for a transformer substation and a holiday barbecue vehicle activated by the activating method. The application has the following main beneficial effects: good activating / repairing effect, improved capacity of returned storage batteries, chemical environmental protection, low cost and wide application range.

The application discloses a lead-sodium storage battery positive pole lead paste in the technical field of storage batteries, which comprises the following components by weight: lead oxide powder 100 parts, sulfuric acid 6-10 parts, deionized water 14-24 parts, short fibers 0.05-0.07 parts, lead dioxide 2-8 parts, lead sulfate 1-2 parts, calcium sulfate 0.5-1.5 parts, stannous sulfate 0.05-0.15 parts, antimony trioxide 0.05-0.15 parts, carbon black 0.5-1 part, sodium hydroxymethyl cellulose 0.1-0.2 parts and mixed carbon material 0.1-0.5 parts. Through the design improvement of the process, the application can effectively improve the formation efficiency, low-temperature performance and service life of the storage battery.

The invention discloses a chemical tin plating solution suitable for fine-pitch high-density interconnection and a preparation method of the chemical tin plating solution, and belongs to the technical field of chemical tin plating. The chemical tin plating solution suitable for fine-pitch high-density interconnection comprises the following components: 12-20 g / L of stannous mono-sulphate, 35-45 mL / L of sulfuric acid, 90-110 g / L of a complexing agent, 30-45 g / L of a reducing agent, 1.2-1.8 g / L of a stabilizer, 1.5-3 g / L of a dispersing agent, 0.8-1.2 g / L of a surfactant, a pH regulator and water. The invention also provides a preparation method of the composition. Compared with the prior art, the dispersing agent is obtained through condensation and sulfonation of the ketone-containing monomer and the formaldehyde, and wettability is improved after sulfonation, so that the blind hole filling problem of fine-pitch electroplating can be solved, and the tin plating solution can form a uniform and stable tin protection layer in a tiny bonding pad and dense wiring environment.

The invention relates to a preparation method of a copper-based Sn-rich heterojunction Co-doped Cu2O / CuSnCo / Sn composite anode material, and belongs to the technical field of composite electrode materials. According to the preparation method, stannous sulfate and cobalt chloride hexahydrate are taken as raw materials, a Sn / Co initial layer is formed on a foamy copper current collector through constant-current pre-deposition, and a foamy copper activated substrate is obtained through vacuum heat treatment; then epitaxially growing a nanocrystalline Sn / Co solid solution phase on the foamy copper activated substrate by adopting pulse electrodeposition; through distributed heat treatment, a CuSnCo ternary alloy layer is firstly formed in a protective atmosphere, then a Cu2O nanostructure is generated in situ through controllable oxidation, finally metal Sn is obtained through selective reduction, and the Cu-based Sn-rich heterojunction Co-doped Cu2O / CuSnCo / Sn composite anode material is obtained. According to the anode material, through unique structural design, the volume expansion of the Sn-based material is effectively inhibited, and the battery capacity and the cycling stability are remarkably improved.

The invention discloses a method for photochemically preparing a triazinyl polymer / tin oxide composite material, and the photochemical preparation method of the triazinyl polymer / tin oxide composite material comprises the following steps: dissolving 3 wt% of stannous mono-sulphate and 3 wt% of sulfuric acid in deionized water, adding a triazine structure polymer, and dispersing to obtain a precursor solution; and irradiating the precursor solution with 254nm ultraviolet light at the light intensity of 12-20mW / cm < 2 > for 6-24 hours, centrifuging, and drying to obtain the triazinyl polymer / tin oxide composite material. According to the preparation method, SnO2 is generated by oxidizing Sn < 2 + > under the induction of ultraviolet light, and the SnO2 and the triazine structure polymer are compounded in situ to form the triazine structure composite material, so that the SnO2-based composite material has wide spectral response and high stability, and the preparation method is simple in process, green, environmentally friendly and suitable for the fields of industrial wastewater treatment and solar energy conversion.

The invention provides a cyanide-free cupronickel-tin electroplating solution and an electroplating method, and relates to the technical field of electroplating. The cyanide-free cupronickel tin electroplating solution comprises the following components: 20 to 50 g / L of copper sulfate, 10 to 30 g / L of stannous mono-sulphate, 90 to 110 g / L of sulfuric acid, 90 to 120 g / L of 3-mercapto-1-sodium propane sulfonate, 50 to 80 g / L of ammonium citrate, 10 to 20 g / L of carboxyethyl thiosuccinic acid, 0.02 to 0.05 g / L of polyepoxysuccinic acid, 0.1 to 0.3 g / L of thiomalic acid, 0.2 to 0.5 g / L of polyaspartic acid, 2 to 4 mL / L of PEG-5 disodium lauryl citrate sulfosuccinate and 1 to 2 mL / L of L-64 propylene glycol block polyether. By adding ammonium citrate, the plating solution can be clarified, by using carboxyethyl thiosuccinic acid, a plating layer can be finer, by using polyepoxysuccinic acid, plating solution precipitation and plating layer impurities can be reduced, by using the dispersion effect of L-64 propylene glycol block polyether, the surface tension is reduced, the plating layer is more uniform and smoother, and wetting of the plating solution on a complex workpiece is promoted.

The present invention discloses a method for efficiently recovering tin resources from fuming furnace dust and preparing stannous sulfate, belonging to the technical field of secondary tin resource recovery. This method oxidatively leaches the fuming furnace dust with a H2O2-H2SO4 mixed solution at 60-80 °C, and the obtained leachate is subjected to reduction, impurity removal and concentration crystallization to obtain stannous sulfate products; this method highly selectively converts SnS in the fuming furnace dust into stannous sulfate in an acidic oxidation environment, realizing the efficient recovery and value-added utilization of secondary tin resources, providing an economical and environmentally friendly raw material source for the production of stannous sulfate, and broadening the production path of stannous sulfate.

The invention provides a deplating solution. The deplating solution comprises the following components in percentage by weight: 10%-30% of sulfuric acid, 0.5%-1.5% of stannous mono-sulphate, 0.5%-2.5% of sodium sulfate, 0.5%-2.5% of a complexing agent, 0.1%-0.5% of an antioxidant, 1%-3% of a copper protection agent, 0.1%-0.5% of an additive and the balance of water, wherein the complexing agent is any one or two of sulfamic acid, methanesulfonic acid, phenolsulfonic acid and citric acid; the antioxidant is any one of resorcinol, hydroquinone and ascorbic acid; the copper protection agent is a core-shell structure corrosion inhibition microsphere, the core-shell structure corrosion inhibition microsphere takes hollow silicon dioxide as a core, the surface of the core-shell structure corrosion inhibition microsphere is grafted with benzotriazole, the outer layer of the core-shell structure corrosion inhibition microsphere is coated with a layer of pH sensitive type polymethylacrylic acid hydrogel shell, and the particle size is controlled to be 5-20 microns; the additive is any one of polyethylene glycol and gelatin. By optimizing the formula of the deplating solution and especially upgrading the copper protection agent system, efficient and lossless deplating of the tin-containing plating layer is achieved, meanwhile, the tin and copper recovery purity is improved, and the service life of the deplating solution is prolonged.

The invention discloses a raspberry structure Pd-Sn-O / Pd-Sn composite material, which is obtained by taking stannous mono-sulphate and palladium chloride as raw materials through hydrothermal reaction and calcination, the components are PdO, SnO2 and Pd2Sn, the microstructure is a raspberry structure, and the size of a single nanoparticle is 15-20 nm. The preparation method comprises the following steps: 1, preparing Pd / Sn-MOF; and 2, synthesis of PdO / SnO2 / Pd2Sn is carried out. A gas sensor based on Pd-Sn-O / Pd-Sn is characterized in that under the conditions that the test temperature is 77.32 DEG C and the test humidity is 5%, the response rate to 2000 ppm H2 is 25000-30000%, the response time is 1-2 s, and the recovery time is 180-190 s; the detection gases are respectively H2, NO2, CO, NH3, H2S and CH4; under the condition that the concentration of the tested gas is the same, the selectivity to H2 is extremely high under the condition that the concentration of the tested gas is 1000 ppm, and the response rate of 1000 ppm H2 is 7000-8000%; according to the invention, under the condition that the humidity is 0-90%, the response rate to H2 is achieved, that is, the humidity resistance is achieved, and under the condition that the humidity is 90%, the response rate to H2 reaches 5000-6000%.

The invention belongs to the technical field of preparation of storage batteries, and particularly relates to a formula of a storage battery positive electrode lead paste. Comprising 800-1000 parts of lead powder, 1-5 parts of sodium antimonate, 0.5-3 parts of stannous mono-sulphate, 1-5 parts of graphite and 1-5 parts of conductive fibers. Wherein the sodium antimonate is the mass fraction of the sodium antimonate in the sodium antimonate aqueous solution, and the stannous sulfate is the mass fraction of the stannous sulfate in the stannous sulfate dilute sulfuric acid solution. According to the storage battery positive electrode lead paste disclosed by the invention, by using the components, in the preparation process, through a formula and a preparation method of liquid components, a specific positive electrode additive combination is adopted, and the dosage of the liquid components is controlled within a certain range, so that the prepared lead paste is uniform in texture and has good uniformity; the argillization of the positive lead plaster is delayed; and the discharge capacity and the cycle life of the battery are improved.

The present invention discloses a lead-acid battery electrolyte additive, and relates to the technical field of lead-acid batteries and electrolyte preparation. The lead-acid battery electrolyte additive of the present invention comprises, by weight: 20-25 parts of lithium slag powder, 5-7 parts of stannous sulfate, 1-1.5 parts of sodium carboxymethyl cellulose, 0.3-0.8 parts of cerium hydroxide, 3-5 parts of lauryl phosphate, 0.8-1.4 parts of polyacrylamide, and 4-7 parts of gelatin. The present invention uses lithium slag powder as the main raw material, and the lithium slag powder contains highly active amorphous silica and aluminum oxide, supplemented by stannous sulfate, sodium carboxymethyl cellulose, cerium hydroxide, etc. to form an electrolyte additive. The electrolyte prepared by using the additive of the present invention can greatly weaken its own local density change rate during the battery charge and discharge process, thereby significantly delaying the stratification phenomenon of the electrolyte, and ultimately achieving the advantages of improving battery performance and service life.

This invention discloses a positive electrode paste for lead-acid batteries with high cycle stability and its preparation method, belonging to the field of electrochemical energy storage technology. Rice husk ash is acid-treated to obtain a wet filter cake. The wet filter cake is refluxed with silane coupling agent KH-550 to obtain functionalized rice husk ash. The functionalized rice husk ash, pyrrole, and ammonium persulfate are mixed and stirred to obtain a composite conductive agent. Aniline, o-aminobenzoic acid, and ammonium persulfate are mixed and stirred to obtain a conductive copolymer. The conductive copolymer is mixed with N-methylpyrrolidone to obtain a dispersion, and glycerol is added and stirred to obtain a modified precursor solution. Lead powder, mixed conductive agent, polypropylene short fibers, stannous sulfate, sulfuric acid solution, deionized water, and the precursor solution are mixed to obtain the positive electrode paste. This method improves the structural stability and electronic conductivity of the positive electrode active material, effectively inhibits the shedding of active material and interface peeling during cycling, and extends the cycle life of the battery under high-rate partial charge conditions.

The invention relates to the technical field of lead-acid storage batteries, and particularly discloses a preparation method of an electrolyte of a lead-acid storage battery, the electrolyte, the lead-acid storage battery and a charging process of the lead-acid storage battery. The preparation method of the electrolyte of the lead-acid storage battery comprises the following steps: mixing hydroxypropyl methyl cellulose, fumed silica with high specific surface area and silica sol step by step in an alkalescent environment; preparing a composite colloid mother solution; preparing a sulfuric acid mixed solution containing anhydrous sodium sulfate, stannous sulfate and potassium sulfate; and mixing the two according to a ratio and cooling to below 5 DEG C to obtain the gel electrolyte which is high in stability and easy to pour. According to the charging process, a refined process including multiple charging and discharging cycles is adopted, polarization is eliminated through short-time discharging, and backward batteries are screened in combination with voltage detection. According to the invention, the problems of easy layering, difficult perfusion and short battery life of the traditional gel electrolyte are effectively solved, and the cycle life and the use performance of the battery are remarkably improved.