65 results about "Ferrocyanide" patented technology

The invention discloses a high-capacity positive electrode electrolyte for all-vanadium liquid flow batteries, wherein the electrolyte contains a solid energy storage material with a concentration of 0.02-1 g / mL, and the main component is a targeted redox solid energy storage material containing ammonia-rich iron / copper ferrocyanide, which reacts with a positive electrode redox medium VO in a supporting electrolyte containing ammonium ions. 2+ / VO2 + With similar equilibrium potential, reversible redox reaction can occur to continue the charge and discharge process. The high-capacity all-vanadium liquid flow battery positive electrode electrolyte disclosed in the present invention uses low-cost solid energy storage materials as the main energy storage medium, so when using a lower positive electrode redox medium VO 2+ / VO2 + High capacity and energy can be achieved at low concentrations, and pentavalent vanadium VO2 + The concentration can enhance the temperature adaptability of the all-vanadium liquid flow battery system while reducing the electrolyte cost.

The present invention discloses a preparation method and production system for sodium nitroprusside. The preparation process comprises the following steps: first, reacting ferrocyanide with nitric acid to obtain a hydrogen nitroprusside aqueous solution; adding alcohol to the concentrated hydrogen nitroprusside aqueous solution to remove inorganic salts generated by the reaction, thereby obtaining a hydrogen nitroprusside alcohol solution; then, adding trisodium citrate to the hydrogen nitroprusside alcohol solution to react to obtain sodium nitroprusside and disodium citrate; separating and removing the citrate to obtain a sodium nitroprusside alcohol solution; and finally, concentrating, crystallizing, separating, and drying the sodium nitroprusside alcohol solution to obtain a sodium nitroprusside product. The present invention also provides a production system based on the preparation method. The production method of the present invention is simple to operate, operates under mild conditions, has a short production cycle, effectively prevents product oxidation, and has high purity. The obtained product is suitable for industrial production, and the production system requires less equipment and has low equipment requirements.

The invention discloses a method for preparing a sodium-rich boundary-rich iron-based prussian blue analogue (FePBA) through one-step hydrothermal synthesis assisted by sodium thiosulfate. The method specifically comprises the following steps: preparing a solution A and a Na4Fe (I I) (CN) 6 solution; the molar ratio of ferrocyanide to Fe ions in the solution B is 3: 4. And preparing a solution B to react with ferrocyanide to form FePBA. Adding sodium citrate to form a sodium and citrate-rich environment, then adding ferric iron salt, and fully stirring to chelate the added Fe < 3 + > with the citrate; and adding sodium thiosulfate after the step. Preparing a PVP (Polyvinyl Pyrrolidone) solution to play roles in dispersing FePBA and reducing agglomeration, and taking the PVP solution as a solution C; slowly dropwise adding the solution A and the solution B into the solution C at a constant speed by using a rubber head dropper to finally obtain a precursor solution, carrying out hydrothermal reaction for 6 hours at 110 DEG C, carrying out suction filtration on the obtained precipitate, and drying to obtain a FePBA sample. According to the invention, the time required for synthesis is greatly shortened, and the traditional coprecipitation of more than 24 hours is improved into rapid hydrothermal reaction of 6 hours.

The invention relates to the technical field of all-vanadium redox flow battery electrolyte additives, and discloses a Prussian-blue-like additive for a vanadium electrolyte as well as a preparation method and application of the Prussian-blue-like additive. Comprising the following steps: dissolving a first metal source, a second metal source and a structure stabilizer in an acid solution, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid I; dissolving ferrous cyanide salt and organic phosphonate in deionized water, and carrying out uniform dispersion treatment to obtain a uniform dispersion liquid II; performing continuous ultrasonic treatment on the uniform dispersion liquid II, and dropwise adding the uniform dispersion liquid I into the uniform dispersion liquid II to obtain a prussian blue-like precursor liquid; and carrying out heat treatment on the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for the vanadium electrolyte. And the material can be used as an all-vanadium redox flow battery electrolyte additive to effectively improve the discharge capacity and the capacity retention ratio of the battery.

The invention provides a preparation method and application of oversized metal ferrocyanide, and relates to the technical field of nonferrous metallurgy. Comprising the following steps: preparing a DMF aqueous solution, and dividing the DMF aqueous solution into two equal parts which are respectively marked as a solution A and a solution B; soluble metal salt is added into the solution A, and the pH value is controlled to be 3-8; ferrocyanide is added into the solution B, and the pH value is controlled to be 3-8; dropwise adding the solution B into the solution A, and reacting to obtain a solution C; and filtering and drying the solution C obtained in the step 4 to obtain the metal ferrocyanide adsorbent. According to the method, N, N-dimethylformamide (DMF) is added as a surfactant in the process of preparing a metal ferrocyanide adsorbent by a conventional chemical precipitation method, and ferrocyanide is synthesized in one step. The oversized metal ferrocyanide adsorbent can be obtained by regulating and controlling the adding proportion of the ferrocyanide and water, and has a better adsorption effect.

The present disclosure relates to a kind of ferric phosphate and its preparation method and use, the preparation method includes the following steps: (1) mixing ammonium ferrocyanide and phosphorus source, obtain iron-phosphorus mixed solution;(2) the iron-phosphorus mixed solution obtained in step (1) is carried out spray pyrolysis, obtain solid particles;(3) the solid particles obtained in step (2) are broken, obtain ferric phosphate.The ferric phosphate provided by the present disclosure has higher purity, tap density and specific surface area, the preparation method can avoid using pH regulator and surfactant, reduce by-product production and cleaning step, greatly simplify production process, have higher industrial application value.

This invention discloses a cathode material, its preparation method, and its application, belonging to the technical field of cathode materials for sodium-ion batteries. The cathode material has a core-shell structure, with a core of sodium manganese ferrocyanide and a shell of potassium manganese ferrocyanide; a manganese ferrocyanide intermediate layer is also present between the core and the shell. The intermediate layer contains Mn... 2+ The ionic radius is greater than that of the Na core. + Larger K atoms, with higher valence states, can reduce lattice spacing, thus supporting the structure and improving the material's cycling stability while inhibiting the absorption of water molecules; the K atoms in the outer shell... + Not only can it provide capacity, but also K + The ionic radius is also larger than that of Na. + Larger and wider ion transport channels result in a more stable structure, which also helps reduce the material's water absorption. The presence of the aforementioned intermediate layer and outer shell significantly improves the structural stability of the cathode material during charge and discharge, reduces side reactions between the cathode and electrolyte, and enhances interfacial stability, cycle performance, and rate performance.

The invention discloses a method for preparing a lithium iron manganese phosphate positive electrode material, which comprises mixing a lithium source, a phosphorus source, a carbon source, an iron source and a manganese source, and then granulating and sintering the mixture, wherein the iron source and the manganese source are from manganese ferrocyanide; the manganese ferrocyanide is a manganese cyanide solution with a mass concentration of 30% to 40%, and the solvent is deionized water. The invention takes a different approach, and the unique manganese-iron ratio (Mn:Fe=3:2) of manganese ferrocyanide just meets the optimal ratio design of lithium iron manganese phosphate (LiMn 0.6 Fe 0.4 PO4), directly mix manganese ferrocyanide with a phosphorus source, a lithium source, a carbon source, etc., grind them into a uniform dispersion, use spray drying to achieve uniform mixing of solid materials, and then form a lithium ion battery positive electrode material with excellent electrical properties after high-temperature sintering and pulverization. The present invention overcomes the problem that manganese iron phosphate cannot be precipitated in proportion at the same time under the conventional phosphate precursor process, effectively realizes the mixing of manganese and iron atoms, and does not cause manganese segregation and manganese dissolution.

The invention provides a Prussian blue positive electrode material and a preparation method thereof, a positive electrode plate, a sodium ion battery and electric equipment, and relates to the technical field of new energy. According to the preparation method of the Prussian blue positive electrode material provided by the invention, the Prussian blue material with high crystallinity, low crystal water and few defects is prepared by using a disodium tartrate one-step method, the method is simple, and the cost is low. The first solution and the second solution are alkalescent and are rich in a large amount of tartrate ions, the tartrate ions are rich in-OH, so that the first solution and the second solution can be used as strong complexing agents, each single tartrate ion can be complexed with a single transition metal ion to form a transition metal-tartrate complex, the release rate of transition metal is obviously reduced, and the transition metal-tartrate complex can be used for preparing the transition metal-tartrate complex. And by virtue of slow combination, the crystal can grow more sufficiently, so that the content of the ferrocyanide and the content of crystal water are reduced.

The invention relates to the field of compound preparation, and discloses a method for preparing alkali metal ferrocyanide by using iron powder as an iron source through a mechanochemical method, and the method comprises the following steps: mixing the iron powder with a solution containing alkali metal cyanide to obtain a mixture, and enabling the water content of the mixture to be not more than 50wt%, the alkali metal cyanide comprises sodium cyanide or potassium cyanide, the reaction time is short, the reaction temperature is low, the process of treating the raw materials in advance is omitted, hydrolysis of the sodium cyanide is reduced, side reactions are reduced, a small amount of NH3 is released in the complexing reaction process, and the method is suitable for industrial production. The yield is high, sulfate containing ferrocyanide is not produced as a byproduct, and unreacted metal residues are recycled. Compared with a traditional method, the method disclosed by the invention is low in production cost and high in added value of products, and has a relatively good industrial prospect.

The invention relates to an online recovery method for an electrolyte of an alkaline total-iron flow battery, and belongs to the technical field of flow batteries. Aiming at the problem of capacity fading caused by consumption of positive oxidation-state substances due to spontaneous reduction of positive ferricyanide into ferrocyanide and permeation of negative polyhydroxy organic ligands of an alkaline total-iron flow battery, a chemical and electrochemical coordinated regulation strategy is provided; and the concentration of the oxidation-state ferricyanide in the positive electrode electrolyte is dynamically monitored and accurately adjusted in the operation process of the battery. According to the method, dynamic balance regulation and control of oxidation state / reduction state substances in the electrolyte are realized through an in-situ chemical or electrochemical regeneration means on the basis of a positive and negative electrode capacity matching relationship, so that the positive electrode electrolyte is repaired on line, and quantitative and controllable capacity recovery of the alkaline all-iron flow battery is realized. According to the technology, the stable cycle life of the battery can be greatly prolonged, the problem of electrolyte failure caused by polyhydroxy ligand migration is solved, the maintenance cost is reduced, and a key technical support is provided for practicability of the alkaline all-iron flow battery in a large-scale energy storage system.

The invention discloses a positive electrode electrolyte of a flow battery, the flow battery containing the positive electrode electrolyte and a preparation method of the positive electrode electrolyte, the positive electrode electrolyte comprises ferrocyanide, a stabilizer, an alkaline component, an auxiliary electrolyte, an additive and water, the total iron concentration is 0.1-2.0 mol / L, the molar ratio of the stabilizer to Fe is 0.05-1.0, the alkaline component is 0.5-3.0 mol / L, the auxiliary electrolyte is 0-1.0 mol / L, the additive is 0.5-1.0 mol / L, the additive is 0.5-1.0 mol / L, and the water is 0.5-1.0 mol / L; the additive is sodium polyacrylate. According to the present invention, the additive is supplemented in the positive electrode electrolyte, such that the low temperature performance of the positive electrode electrolyte is effectively improved, the use scene of the flow battery positive electrode electrolyte is expanded, and the application range is widened.

The invention relates to an alkalescent total-iron flow battery electrolyte and a preparation method thereof. The lithium ion battery comprises a positive electrode electrolyte and a negative electrode electrolyte, the positive electrode electrolyte is a weakly alkaline aqueous solution of ferrocyanate, the negative electrode electrolyte is a weakly alkaline aqueous solution of ferric salt and an ethylenediamine di-o-hydroxyphenyl acetate complex, and the pH value of the positive electrode electrolyte and the pH value of the negative electrode electrolyte are kept consistent and are 8.0-11.0. In the negative electrode electrolyte, ethylenediamine di-o-hydroxyphenyl acetate is adopted as a complexing agent and forms a stable hexa-coordination structure with iron ions, so that the stability of the negative electrode electrolyte is enhanced; under the weak alkaline condition, generation of ferric hydroxide precipitates in positive and negative electrolyte can be effectively inhibited, and the stability of iron ions is improved; besides, the ligand molecules are large in size, the steric effect of the formed chelate is large, the transmembrane migration degree of iron ions / ferrous ions is reduced, the cycle life of the total-iron flow battery is greatly prolonged, and the total-iron flow battery can be widely applied to various aqueous flow batteries.

The invention relates to an aqueous magnesium ion battery positive electrode material and a preparation method thereof, and belongs to the technical field of battery materials, the positive electrode material is a HE-MnZnFePBA-coated CNT composite material, HE-MnZnFePBA is a Prussian blue analogue doped with three metals of manganese, zinc and iron, CNT is COOH-MWCNT, and HE-MnZnFePBA grows on the surface of COOH-MWCNT in situ. According to the HE-MnZnFe PBAatCNT composite positive electrode material and the preparation method thereof, the prepared HE-MnZnFe PBAatCNT composite positive electrode material is doped with Mn, Zn and Fe, the Mn element can improve the electrochemical activity of the material and provide high-capacity contribution, and the Zn element can enhance the lattice stability and inhibit structural collapse in the circulation process; meanwhile, due to the introduction of the carboxylated multi-walled carbon nanotubes, the conductivity of the material is remarkably improved, the ion transmission resistance is effectively reduced, and slow growth of crystals is realized by adopting a slow coprecipitation method and controlling the solution dripping rate, the reaction temperature and the reaction time; meanwhile, the excessive sodium ferrocyanide ligand can perform in-situ vacancy repair on the crystal, so that lattice defects are reduced, and the structural integrity of the material is improved.

The invention discloses a magnetic composite adsorption material with a core-shell structure, a preparation method of the magnetic composite adsorption material and application of the magnetic composite adsorption material in radioactive waste oil treatment, and belongs to the technical field of adsorption material preparation and radioactive waste treatment. The composite adsorbent (Fe3O4 (at) SiO2 (at) TiO2 (at) KTiFe (CN) 6) is of a core-shell structure, Fe3O4 is a magnetic core layer, SiO2 is a middle protective layer, TiO2 is a titanium source functional layer, and KTiFe (CN) 6 ferrocyanide on the outermost layer is a Cs < + > selective adsorption active layer. High-selectivity capturing of Cs < + > in an organic solvent matrix simulating radioactive waste oil and rapid magnetic separation after treatment are achieved. The design strategy effectively overcomes the ubiquitous problems of poor dispersibility, difficult recovery, limited applicability and the like in the application of the traditional ferrocyanide adsorbent in a non-aqueous system.

A preparation method of carbon-doped iron phosphate, comprising the following steps: (1) mixing ammonium ferrocyanide, a phosphorus source and pyridine oxide to obtain an iron-phosphorus mixed solution; (2) performing spray pyrolysis on the iron-phosphorus mixed solution obtained in step (1) to obtain solid particles; (3) crushing the solid particles obtained in step (2) to obtain carbon-doped iron phosphate; and further applying the carbon-doped iron phosphate obtained by the above preparation method to prepare lithium iron phosphate.

The application discloses a kind of alkaline full iron liquid flow batteries and preparation method of electrode material.Its characteristics are: the positive electrolyte of the alkaline full iron liquid flow battery is with ferrocyanide as active substance, one or both of NaOH and KOH as supporting electrolyte, the negative electrolyte is with 3-[N-N-bis (2-hydroxyethyl) amino]-2-hydroxypropane sulfonic acid and ferric chloride reaction to form complex iron as active substance, one or both of NaOH and KOH as supporting electrolyte to form the alkaline full iron liquid flow battery.The application increases the reaction active site of positive and negative electrode electrolyte active substance on the surface of electrode respectively, so as to improve the charge-discharge capacity of liquid flow battery.

The present invention discloses a method and application for organic enhanced stabilization of arsenic in arsenic ferrocyanide, which belongs to the field of wastewater treatment technology. The method comprises the following steps: adding an organic solution containing carboxyl groups to arsenic (III)-containing wastewater, adding a sulfate solution of appropriate concentration, adjusting the pH to less than 3, and then slowly adding a solution containing trivalent iron salt, wherein Fe 3+ ∶As 3+ ∶SO4 2‑ The ratio of arsenic to ferrous iron is 1.5:1:0.25, and the pH value is kept constant during the injection process; the mixture is heated and stirred to a temperature of 25-65°C, reacted for a period of time, and after the reaction is completed, the precipitate is separated. The present invention accelerates the mineralization rate through the strong complexation between organic matter and trivalent iron, achieving a trivalent arsenic removal rate of over 95%. The resulting arsenic nitrite has low leaching toxicity, controlling the leaching toxicity to below 5 mg / L for the first time. The process is simple, and the residual arsenic concentration in wastewater is reduced by approximately 50%, with broad prospects for practical application.

The present invention relates to a white coloring agent for weathering steel rust layer and a method for using the same. The coloring agent is composed of an agent A and an agent B. The agent A is composed of ferrocyanide: 4.5-18.4 g / L, penetrant: 70-290 g / L, thickener: 5-10 g / L, and the balance is water; the agent B is composed of manganese salt: 3.8-7.6 g / L, auxiliary agent: 0.05-0.1 g / L, and the balance is water. Compared with the prior art, the present invention has the following beneficial effects: the surface of the weathering steel treated with the treatment agent is white and has a good decorative appearance, providing a solution for the color performance and application scenario expansion of the coating-free weathering steel. The white coloring agent is water-based and does not contain harmful components such as volatile organic compounds and hexavalent chromium. The coloring treatment has a simple implementation process and low construction cost, and is suitable for implementation at the construction site of weathering steel components.

The invention discloses a novel method for recovering valuable metals in waste neodymium iron boron, and relates to the technical field of neodymium iron boron waste recovery. According to the method, the waste neodymium iron boron is subjected to acid leaching by adopting the inorganic acid as the leaching agent, so that iron and rare earth are fully dissolved in the leaching agent, impurities are removed through liquid-solid separation, ferrous cyanate is used as the iron precipitation agent, iron is separated out in the form of Prussian blue precipitation, rare earth is reserved in a liquid phase, efficient separation of iron and rare earth is achieved, and the method is suitable for industrial production. And the iron precipitation effect is obvious. According to the method, the Prussian blue precipitate obtained through the iron precipitation reaction reacts with the alkali liquor to generate alpha-FeOOH and the ferrocyanate solution, the alpha-FeOOH can be used as an adsorbent, a catalyst and an energy storage material for high-valued recovery after being dried, meanwhile, the generated ferrocyanate solution can be recycled, the production cost is reduced, and waste liquid is reduced.

The present invention relates to a blue coloring treatment agent for weathering steel rust layer and a method for using the same. The coloring treatment agent is composed of a pretreatment agent and a coloring agent. The pretreatment agent is composed of: citric acid: 19-48 g / L, inorganic acid: 1.5-10 g / L, copper salt: 8-25 g / L, nickel salt: 3.9-12 g / L, auxiliary agent: 0.05-0.08 g / L, and the balance is water; the coloring agent is composed of: ferrocyanide: 45-147 g / L, penetrant: 2.5-10 g / L, and the balance is water. The surface of the weathering steel treated with the treatment agent of the present invention presents a blue color and has a good decorative appearance, providing a solution for the color performance and application scenario expansion of the coating-free weathering steel. The blue coloring treatment agent is water-based and does not contain harmful components such as volatile organic matter and hexavalent chromium. The coloring treatment has a simple implementation process and low construction cost, and is suitable for implementation at the construction site of weathering steel components.

The invention belongs to the field of nano material preparation, and particularly discloses a Fe5C2 powder nano material as well as a preparation method and application thereof. According to the preparation method, ferrous salt and potassium ferricyanide are mixed in proportion for reaction to prepare a precursor ferrous ferricyanide, and the precursor is carbonized and roasted in a reducing atmosphere to obtain the pure single-phase Fe5C2 powder nano material. The invention solves the problems of complex technology, harsh conditions, low product purity and the like in the preparation process of iron carbide, provides a simple and safe preparation method with strong process controllability, and provides a new way for research and application of iron carbide.

The invention relates to the technical field of preparation of inorganic-organic composite functional materials, and relates to a preparation method of an MFCs-coated E-ZrP composite adsorbent and a separation membrane thereof, and the method comprises the following steps: firstly, carrying out intercalation stripping on alpha-zirconium phosphate by using trihydroxymethyl aminomethane through a colloid assembly intercalation method to prepare a water-based E-ZrP dispersion liquid; then transition metal chloride and potassium ferrocyanide are sequentially introduced into the water-based E-ZrP dispersion liquid, metal ferrocyanide is generated through an in-situ reaction, and the MFCs-coated E-ZrP composite adsorbent is obtained; and blending the composite adsorbent with a high-molecular polymer, and preparing the MFCs-coated E-ZrP composite separation membrane by adopting a non-solvent induced phase separation technology. The composite adsorbent and the separation membrane prepared by the invention have high selective adsorption capacity and excellent structural stability on rubidium and cesium ions, and can be widely applied to the fields of separation and extraction of rubidium and cesium in salt lake brine, underground brine and geothermal water, removal of cesium ions in radioactive wastewater and the like.

The present invention relates to a preparation method and application of a nitrogen-doped carbon-supported copper-iron bimetallic catalyst. The preparation method comprises: 1) mixing ferrocyanide with water to obtain solution A; mixing a copper source compound, a reducing metal salt with water to obtain solution B; 2) mixing solution A in step 1) with solution B, reacting at a certain pH, washing and drying the product to obtain a metal-containing complex; 3) calcining the metal-containing complex obtained in step 2) under an inert atmosphere. The catalyst of the present invention exhibits excellent catalytic performance when applied to carbon dioxide electroreduction, and has the characteristics of high selectivity and high stability. In an alkaline electrolyte, CO2 can be selectively electrocatalytically reduced to CO at a low potential, and has a high current density. The preparation method has a simple operating process, low cost, mild reaction conditions, is a green process route, and has potential industrial application value.

The invention discloses a leaching method for reducing mercury leaching in mercury-containing gold ore, and belongs to the field of metal refining. The pH value of the mercury-containing gold ore pulp is adjusted to 11.5 or above, soluble ferrocyanate is added, and stirring and leaching are conducted. The concentration of CN <-> in the ore pulp is detected in the leaching process, and when the concentration of CN <-> is larger than 100 mg / L, a certain amount of soluble copper salt is added into the ore pulp to control the concentration of CN <-> to be smaller than 100 mg / L; and after leaching is finished, ore pulp is filtered to obtain a leaching pregnant solution of the mercury-containing gold ore, a leaching barren solution is obtained after precious metal in the pregnant solution is recycled, the Fe content in the leaching barren solution is detected, soluble ferrocyanate is supplemented according to the Fe content, and then the leaching barren solution returns to a leaching system to serve as slurry mixing water of the mercury-containing gold ore to be recycled. According to the method, the ferrocyanate which is safer and more environmentally friendly than cyanide is adopted as a leaching agent, compared with an existing method, the agent system is simplified, organic matter influencing the leaching index is not introduced, and leaching of Hg is greatly reduced.

Provided is a spinel-type lithium manganese oxide having improved long-term stability in charge-discharge cycles at high temperatures. SOLUTION: A spinel-type lithium manganese oxide containing ferrocyanide.

The invention belongs to the technical field of flow batteries, and provides a flow battery positive electrode electrolyte, a preparation method thereof and a flow battery. The positive electrode electrolyte comprises the following components: ammonium ferrocyanide, lithium ferrocyanide, a composite additive and a supporting electrolyte; the composite additive comprises a soluble Prussian blue derivative and / or polyvinylpyrrolidone. The concentration of an iron active substance on the positive electrode side is greatly increased by using two or more ferrocyanide as the sulfur-iron flow battery positive electrode electrolyte, and the soluble Prussian blue derivative and polyvinylpyrrolidone are used as the composite additive, so that on one hand, the hydrogen-bond interaction of mixed salt and water can be weakened, water clusters are reduced, and on the other hand, the concentration of the iron active substance on the positive electrode side can be reduced; on the other hand, the interaction of anions and cations in the electrolyte can be weakened, so that a large-scale structure cluster is destroyed, and the performance and long-term cycling stability of the battery are jointly improved through the mutual cooperation of the anions and cations.

The invention discloses an energy storage module and an energy storage battery pack, and belongs to the technical field of energy storage battery preparation, the battery pack is composed of a positive electrode material, a negative electrode material, an electrolyte, a diaphragm and an auxiliary agent; the positive electrode material is prepared from a carbon quantum dot modified Prussian blue analogue; the Prussian blue analogue is composed of a precursor and a metal salt, the precursor is at least one of cobalt hexacyanoferrate and iron hexacyanoferrate, and the metal salt is a transition metal salt and an alkali metal salt; the carbon quantum dots are potassium citrate as a carbon source; the negative electrode material is prepared from a silicon-carbon composite material consisting of nano silicon, a pyrolysis carbon source, metallurgical silicon powder and a solvent; the electrolyte is sulfide solid electrolyte; the diaphragm is a ceramic coated diaphragm; the auxiliary agents are a conductive agent, a binder and a current collector. According to the energy storage battery pack, through material innovation and structural design, the defects of an existing energy storage battery are effectively overcome, and the energy storage battery pack has the advantages of being high in energy density, long in cycle life, rapid in charging and discharging, low in cost and high in safety.

This invention relates to the field of vanadium redox flow battery electrolyte additives, and discloses a Prussian blue-like additive for vanadium electrolytes, its preparation method, and its application. The method includes the following steps: dissolving a first metal source, a second metal source, and a structural stabilizer in an acidic solution and uniformly dispersing them to obtain a uniform dispersion I; dissolving ferrocyanide and an organophosphonate in deionized water and uniformly dispersing them to obtain a uniform dispersion II; subjecting uniform dispersion II to continuous ultrasonic treatment, and adding uniform dispersion I dropwise to uniform dispersion II to obtain a Prussian blue-like precursor solution; and heat-treating the Prussian blue-like precursor solution to obtain the Prussian blue-like additive for vanadium electrolytes. Using this additive as a vanadium redox flow battery electrolyte can effectively improve the battery's discharge capacity and capacity retention.

The synthesis and uses of organic hexacyanoferrates is provided. The synthesis of organic hexacyanoferrates includes steps of reacting potassium ferrocyanide or potassium ferricyanide with a nitrogen-organic compound and then collecting the crystals formed therefrom. Compounds of the formula R3Fe(CN)6 are formed from potassium ferricyanide (K3Fe(CN)6), Compound of R4Fe(CN)6 are formed from potassium ferrocyanide (K4Fe(CN)6). Compounds of the formula R3FeH(CN)6, are formed by reacting R3Fe(CN)6 with hydrazine. Compounds of the formula R3FeH(CN)6 are formed from tri-potassium hydrogen ferrocyanide (K3HFe(CN)6).