2519 results about "Manganese oxide" patented technology

The lithium nickel manganese oxide positive electrode material, the preparation method thereof and the electrochemical device are characterized in that the lithium nickel manganese oxide positive electrode material provided by the embodiment of the invention comprises a base material and a coating layer located on the surface of the base material, the general formula of the base material is Li (LiaNixMnyMbO4), the element M comprises at least one of Ti, Zr, Al, Nb and Mo, and a is more than or equal to 0.02 and less than or equal to 0.06; 0.45 < = x < = 0.55, 1.4 < = y < = 1.6; 0.05 < = b < = 0.55; a + x + y + b = 2, and the coating layer contains phosphate. According to the lithium nickel manganese oxide positive electrode material, through doping and coating technologies, under the condition that the capacity is not sacrificed, the gas production phenomenon is effectively reduced, the cycling stability of the lithium nickel manganese oxide positive electrode material is improved, and the service life of an electrochemical device applying the lithium nickel manganese oxide positive electrode material is prolonged.

The invention relates to a denitration catalyst capable of resisting alkali metal, water and sulfur composite poisoning and a preparation method and application thereof, and belongs to the field of environment-friendly catalytic materials and air pollution control. An organic solvent is used as a template agent, cerium oxide, manganese oxide and tungsten oxide are used as active components, and a cerium-manganese-tungsten composite oxide active component with a porous structure and strong acidity is prepared by a coprecipitation-soft template method. The catalyst has a wide denitration temperature window, high denitration efficiency and excellent composite poisoning resistance stability. The catalyst component is environment-friendly, low in cost and simple in preparation method, and is particularly suitable for stable and efficient purification of NOx in complex flue gas in the cement industry.

The invention provides a lithium ion battery and electric equipment, the lithium ion battery comprises a positive pole piece and an electrolyte, active substances in the positive pole piece comprise a phosphate lithium positive pole material and nickel cobalt manganese lithium oxide, and the electrolyte comprises a positive pole film-forming agent, a negative pole film-forming agent and a lithium salt, the lithium salt comprises lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide, the lithium ion battery meets the following formula: # imgabs0 #, NL is the mass ratio of the lithium nickel cobalt manganese oxide to the lithium phosphate positive electrode material, Salt is the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide in the electrolyte by taking mol / L as the unit, and the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide in the electrolyte is the sum of the molar concentrations of the lithium hexafluorophosphate and the lithium bis (fluorosulfonyl) imide. Add is the mass ratio of the positive electrode film-forming agent to the negative electrode film-forming agent. When the ternary material is doped in the lithium manganese iron phosphate or the lithium iron phosphate, the proportion of the positive and negative electrode film-forming agents and the proportion of the heat-resistant high-lithium salt can be adjusted according to the mixing proportion of the lithium manganese iron phosphate and the lithium iron phosphate, so that the cycle performance of the battery is improved.

The invention relates to the technical field of PVC pipe production and processing, and particularly discloses a PVC pipe composition and a preparation method of a PVC pipe. PVC resin and PE resin are compounded, the problem of PVC decomposition caused by high temperature in the processing process is reduced, meanwhile, the PE resin has good flexibility, and by compounding the PVC resin and the PE resin, the PVC resin and the PE resin have good flexibility, so that the PVC pipe composition is more stable in performance. The mechanical property of the PVC pipe can be improved; 4-carboxyphenylboronic acid in the composite modified attapulgite provided by the invention forms a B-O-B cross-linked network structure at a high temperature, the 4-carboxyphenylboronic acid can have a synergistic effect with composite metal oxides (zinc oxide and manganese oxide), the thermal stability and compactness of a carbon layer are improved, and the flame retardant property of the PVC pipe is further improved; a flexible alkyl long-chain structure is formed through copolymerization of 1, 4-diol, reversible deformation occurs under the action of external force, and the mechanical property of the PVC pipe is further improved.

The invention belongs to but not limited to the technical field of electrode materials, and particularly relates to a high-tap-density lithium nickel manganese oxide positive electrode material, a preparation method and a lithium ion battery, the chemical general formula of the high-tap-density lithium nickel manganese oxide positive electrode material is LiNi < 0.5-x > Mn < 1.5-y > M < x > N < y > O < 4 >, 0.1, 0 < = y < lt >; 0.1, M and N are doping elements and comprise one or more of Mg, Co, Al, Zr, W, Sb, Ta and Ti; the material is micron-sized spherical secondary particles formed by stacking and aggregating nano-sized octahedral primary particles, and is uniformly dispersed without agglomeration; the spherical secondary particles are formed by mixing spherical secondary particles with large and small particle size distribution, and the average particle size range of the large particles is 3lt; d < 50lt >; the average particle size range of the small particles is 1lt; d < 50lt >; 2 [mu] m.

The invention belongs to the technical field of lithium batteries, and discloses a lithium nickel manganese oxide positive electrode material, a preparation method thereof and a lithium ion battery. Wherein the lithium nickel manganese oxide positive electrode material has a regular truncated octahedron single crystal structure, and the ratio K of a (111) crystal face orientation parameter to a (100) crystal face orientation parameter in an XRD (X-Ray Diffraction) spectrogram of the lithium nickel manganese oxide positive electrode material is 1-1.6. The lithium nickel manganese oxide positive electrode material provided by the invention has excellent rate capability and cycling stability, and can be well applied to production and manufacturing of lithium ion batteries.

The invention discloses a preparation method of a lithium manganese iron phosphate precursor, which comprises the following steps: mixing a manganese source and an iron source according to the molar ratio of Mn < 2 + > to Fe < 2 + > of (1.5-4): 1, adding water to prepare a manganese and iron ion mixed solution with the total concentration of Mn < 2 + > and Fe < 2 + > of 1-2mol / L, then dropwise adding the manganese and iron ion mixed solution and a precipitator into a base solution at the same time to obtain a reaction mixed solution, carrying out heat preservation and aging on the reaction mixed solution, then carrying out solid-liquid separation to obtain a filter cake, sequentially washing, drying and calcining the filter cake to obtain ferromanganese oxide, and then preparing a lithium iron manganese phosphate material by taking the obtained ferromanganese oxide as a lithium iron manganese phosphate precursor; according to the method, the soluble manganese source and the iron source are adopted for coprecipitation, and the manganese-iron ratio, the reaction rate, the pH and the reaction temperature are controlled, so that stable manganese-iron oxide with uniformly mixed manganese and iron is prepared, the stability of the further prepared lithium manganese-iron phosphate material is higher, and the electrochemical performance of the lithium manganese-iron phosphate material is effectively improved.

The invention discloses a graphene composite perovskite manganese oxide polycrystalline ceramic and a preparation method and application thereof, and belongs to the technical field of non-refrigeration high-sensitivity infrared detection. The chemical expression of the graphene composite perovskite manganese oxide polycrystalline ceramic is La < 0.81 > (Ca < 0.03 > Sr < 0.16 >) MnO3: Gy, G is graphene, y is the mass fraction of graphene in perovskite manganese oxide composite powder, and y is equal to 0.1-0.2%. The TCR value of the prepared polycrystalline ceramic can reach 30% or above, the Tk value is close to 300K, the polycrystalline ceramic has excellent adaptability to room temperature work and excellent sensitivity to temperature change, and when the polycrystalline ceramic is applied to an uncooled infrared detector, the detection precision of the uncooled infrared detector can be effectively improved.

The invention relates to the field of town sewage treatment, in particular to a town sewage carbon-nitrogen-phosphorus synergistic advanced treatment method based on biological manganese oxide. The method comprises the following steps: S1, configuring an upward flow denitrification filter tank; s2, a starting stage: taking a mixed solution of secondary effluent and secondary influent water of an actual town sewage treatment plant and manganese sulfate as influent water of a denitrification filter tank with the manganese concentration of 3.0 mg / L, inoculating hydrolytic acidification bacteria, denitrifying bacteria, anaerobic ammonium oxidation bacteria and manganese oxidation bacteria into the denitrification filter tank, and gradually increasing the ratio of the secondary influent water to the secondary effluent water in the mixed solution to 3%; s3, a stable stage: taking a mixed solution of secondary effluent and secondary inlet water of an actual town sewage treatment plant and manganese sulfate as inlet water of the denitrification filter tank, controlling the manganese concentration to be 3.0 mg / L, controlling the hydraulic retention time to be 3-4 hours, and controlling the backwashing period to be 9-11 days. The method can synchronously and efficiently remove carbon, nitrogen and phosphorus in the secondary effluent of the actual town sewage treatment plant at low cost.

The invention belongs to the technical field of architectural ceramics, and particularly discloses radiation refrigeration glaze, a preparation method thereof and a lightweight ceramic tile. The radiation refrigeration glaze comprises a basic glaze and radiation refrigeration powder, the radiation refrigeration powder comprises nano-porous alumina and metallic oxide doped magnesium aluminate spinel, and the metallic oxide is selected from at least one of iron sesquioxide, manganese dioxide, cobalt sesquioxide and copper oxide. According to the invention, nano-porous alumina and metallic oxide doped magnesium aluminate spinel are compounded as radiation refrigeration powder, and the radiation refrigeration powder is added into the cover glaze of the light ceramic tile, so that not only are good glaze quality and tile shape obtained, but also the sunlight reflectivity ratio of the glaze is improved, thereby achieving a good radiation refrigeration effect, and improving the service life of the light ceramic tile. The sunlight reflectivity reaches up to 88-94%, the glaze quality and the brick shape are good, and the surface flatness is + / -0.3 mm.

The invention belongs to the technical field of microorganisms, and particularly relates to a manganese-resistant manganese oxide strain Klebsiella oxytoca YJ and application of the manganese-resistant manganese oxide strain Klebsiella oxytoca YJ. The invention discloses a manganese-resistant manganese oxide strain YJ, the taxonomic name of the manganese-resistant manganese oxide strain YJ is Klebsiella oxytoca, the manganese-resistant manganese oxide strain YJ is preserved in Guangdong Microbial Culture Collection Center on May 21, 2024, and the preservation number is GDMCC No: 64667. According to the invention, manganese-resistant strains are screened to obtain a strain YJ of which the tolerance concentration to manganese is 200mM, and the strain YJ is Klebsiella oxytoca through morphological and molecular biological identification, and the strain YJ is Klebsiella oxytoca. Research on the removal rate of heavy metals shows that the removal rate of Mn (II) in a 500mg / kg culture solution reaches 92.20% at the 4th day, the removal rate of As (III) in a 50mg / kg culture solution reaches 98.40% at the 4th day, and the removal rate of Cd (II) in a 5mg / kg culture solution reaches 57.07% at the 5th day. Therefore, the strain YJ has very important significance on pollution treatment of heavy metals such as Mn, As and Cd.

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention relates to a habitat restoration-oriented sediment elution critical threshold evaluation method. The method comprises the following steps: introducing form classification including an exchange state, a carbonate binding state, an iron and manganese oxide binding state, an organic binding state and a residue state; a dynamic disturbance response mechanism is fused, and the elutable proportion is re-evaluated under the conditions of flow velocity, pH, oxidation reduction potential Eh and change; calculating a potential active flux index PAFI to quantify a real releasable part of the pollutants in the bottom mud; establishing pollution flux and biological response time sequence data; depicting ecological response sensitive inflection points by using nonlinear fitting; extracting an ecological function critical damage point EBCP as an ecological constraint upper limit of the elution threshold; constructing a habitat bearing factor set comprising a water body volume ratio, submerged vegetation density and benthic organism biomass; introducing a bearing feedback coefficient CFC, and dynamically correcting a pollutant critical flux value; and outputting a loadable elution flux interval for judging whether the ecological risk red line is touched or not.

The invention belongs to the field of soft magnetic ferrite, and discloses a high-frequency low-loss manganese zinc ferrite material and a preparation method thereof, and the manganese zinc ferrite material comprises main components and auxiliary components. The main components comprise ferric oxide, zinc oxide, manganese oxide and cobaltosic oxide. The auxiliary components comprise calcium carbonate, silicon dioxide and tantalum pentoxide. The preparation method of the manganese zinc ferrite material comprises the following steps: proportioning, drying and ball-milling; pre-sintering is performed; performing secondary ball milling; performing granulation; forming is conducted; sintering is performed; and performing thermal aging. The manganese-zinc ferrite prepared by the invention has relatively low power loss under a high-frequency condition, and can be applied to the field of electronic materials related to power conversion, such as transformers and inductors.

The invention relates to the field of energy storage battery materials, in particular to a high-entropy alloy coated single crystal nickel-rich cobalt-free positive electrode material and a preparation method thereof.The preparation method comprises the following steps that S1, nano nickel oxide, nano manganese oxide and LiOH.H2O are ground and mixed to be uniform, and mixed powder is obtained; s2, uniformly stirring and mixing the mixed powder and the high-entropy alloy precursor solution, performing vacuum drying, and performing first-stage sintering in an oxygen atmosphere; the high-entropy alloy precursor solution is a metal salt solution containing aluminum, titanium, molybdenum, manganese and nickel metal ions; and S3, carrying out second-stage sintering, naturally cooling to room temperature, and grinding to obtain the high-entropy alloy coated single-crystal nickel-rich cobalt-free positive electrode material. The preparation process of the high-entropy alloy coated single crystal nickel-rich cobalt-free positive electrode material is simple, the high-entropy alloy coated layer can improve the conductivity, the power and the energy density performance, the growth of primary particles can be promoted by two-stage calcination, the rate capability is excellent, and the cycle performance is stable.

The invention relates to a surface-modified lithium-rich manganese oxide material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery positive electrode materials. The material comprises a layered lithium-rich manganese oxide substrate and layered spinel heterostructures uniformly distributed on the surface of the lithium-rich manganese oxide substrate, the spinel heterojunction is one or two of LiMn2O4 and Li4Mn5O12, and the thickness of the spinel heterojunction is 5 nm to 10 nm; the surface of the modified lithium-rich manganese oxide material also contains an oxygen vacancy structure. Benefited from the existence of the heterostructure and the oxygen vacancy structure, the material disclosed by the invention has relatively high capacity and rate capability; in the electrochemical cycle process, release of oxygen, interface side reaction and irreversible phase change of a layered phase, a spinel phase and a rock salt phase are all inhibited. The lithium ion battery assembled by using the material as a positive electrode has high first-circle coulombic efficiency, and the problem of capacity fading in circulation is also relieved.

The invention relates to the technical field of batteries, and discloses a preparation method of a lithium nickel manganese oxide positive electrode active material, a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, the positive pole piece comprises a positive pole film layer, the positive pole film layer comprises a lithium nickel manganese oxide positive pole active material, in an XRD diffraction pattern of the lithium nickel manganese oxide positive pole active material, the full width at half maximum of a characteristic diffraction peak of a (111) crystal face is 0.1-0.2 degree, the full width at half maximum of a characteristic diffraction peak of a (311) crystal face is 0.1-0.2 degree, and the full width at half maximum of a characteristic diffraction peak of a (311) crystal face is 0.1-0.2 degree. And (400) the full width at half maximum of the characteristic diffraction peak of the crystal face is 0.1-0.2 degree. According to the battery monomer provided by the embodiment of the invention, lattice defects of the positive electrode active material are few, capacity fading can be delayed in the cycle process, and the cycle performance of the lithium ion battery can be remarkably improved.

The invention discloses a selective separation and resource utilization method of chromium in a sodium vanadium solution, which comprises the following steps: S1, measuring a predetermined volume of sodium vanadium solution, and heating to a predetermined temperature; s2, a preset amount of divalent manganese salt is added into the sodium vanadium solution, so that hexavalent chromium is subjected to a reduction reaction; s3, after the reaction is finished, carrying out solid-liquid separation and washing to obtain chromium and vanadium removed liquid and precipitates; s4, vanadium precipitation and calcination are conducted on the chromium and vanadium removal liquid, and a vanadium oxide product is obtained; and calcining the precipitate at high temperature to obtain the chromium-manganese oxide. According to the method, the sodium vanadium solution is used as a raw material, the divalent manganese salt is used as a reducing agent, hexavalent chromium is reduced into trivalent chromium, the trivalent chromium generates chromium hydroxide precipitate under the alkaline condition, vanadium is not reduced and is reserved in the solution, and efficient separation of vanadium and chromium is achieved; the dechromed vanadium liquid is subjected to vanadium precipitation and calcination, and a vanadium oxide product is obtained; after the precipitate is subjected to high-temperature calcination, chromium-manganese oxide is obtained and can be used for preparing chromium-manganese alloy, and resource utilization is achieved.

The invention discloses a manganese oxide monolithic metal foam catalyst and a preparation method and application thereof, and belongs to the technical field of air purification. A manganese acetate solution is used as an electrolyte, a three-electrode system is used for carrying out electro-deposition on a pretreated metal foam substrate, and a product obtained after electro-deposition is washed and dried to obtain the manganese oxide monolithic metal foam catalyst. The preparation method of the manganese oxide monolithic metal foam catalyst disclosed by the invention is simple to operate, not only is suitable for metal substrates in any shape, but also can ensure that the active components of the manganese oxide are firmly loaded and uniformly dispersed on the substrate; the catalyst has the advantages of excellent activity, good conductivity, industrial application facilitation and the like. The manganese oxide monolithic metal foam catalyst provided by the invention still has excellent long-time use stability and water resistance under a high-humidity condition.

The invention discloses positive lead paste for a lead storage battery and a preparation method of the positive lead paste. The formula of the positive lead paste comprises lead powder, dilute sulphuric acid, water and an additive, and the additive comprises the following components in parts by mass: 2-6 parts of manganese dioxide / three-dimensional carbon-based composite electrode material, 1-2 parts of antimony trioxide, 1-2 parts of stannous mono-sulphate, 20-50 parts of red lead and 0.8-1.2 parts of polyester fiber. The manganese dioxide / three-dimensional carbon-based composite electrode material is adopted to replace conductive graphite and other conductive carbon materials, the conductivity is good, a stable three-dimensional structure is achieved, the active substance structure can be fixed during discharging, the positive active substance is effectively prevented from being softened, and the service life of the battery is prolonged; manganese dioxide has an oxidation catalysis function and can catalyze the efficiency of converting lead sulfate into lead dioxide, so that the charging capacity of the positive plate is greatly improved during charging, and side reactions are reduced; the composite electrode material has high specific capacitance, and the discharge capacity of a positive plate is improved during discharge.

The invention discloses a method for preparing a fluorescent material based on a waste NCM ternary lithium battery and application of the fluorescent material, and the preparation method of the fluorescent material comprises the following steps: disassembling the waste NCM ternary lithium battery to obtain a nickel cobalt lithium manganate waste material and preparing the nickel cobalt lithium manganate waste material into powder; impurities and part of ions in the nickel cobalt lithium manganate waste powder are removed, and manganese-containing powder is prepared; and mixing manganese-containing powder, a first perovskite fluorescent raw material, a ligand, a protective material and a solvent, heating and stirring under a vacuum condition, heating under a nitrogen atmosphere, adding a second perovskite fluorescent raw material solution into the system for reaction, and cooling after the reaction is finished to obtain the manganese-doped perovskite fluorescent material. According to the method, the efficient recycling of the waste NCM ternary lithium battery is realized, the preparation cost of the fluorescent material is reduced, the resource recycling rate is improved, the environmental pollution is reduced, and the manganese-doped perovskite fluorescent material is simple to operate when chloride ions are detected after being loaded on the carrier and can be used for field detection.

The invention discloses a lithium nickel manganese oxide positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium batteries. Organic matters such as titanate, aluminate and borate are sprayed into the fluidized bed through the fluidized bed and are mixed with the positive electrode material in a flowing state, so that the positive electrode material is uniformly coated by the coating raw material; and after coating, the coating agent can be quickly dried in a fluidized bed, so that the step of independent drying is omitted, and agglomeration and segregation of the coating agent on the surface of the positive electrode are effectively reduced. By using the fluidized bed coating, the coating agent can be integrally, tightly and firmly coated on the surface of the lithium nickel manganese oxide (LNMO) positive electrode material, so that long-time soaking of the positive electrode in water or other solvents in a conventional liquid phase coating method is avoided; and meanwhile, the fluidized bed has a crushing and dispersing effect, so that the requirement on the dispersity of the LNMO is low. The coating layer formed by the method is stable and not easy to fall off, the direct contact between the surface of the LNMO positive electrode material and an electrolyte is effectively prevented, the dissolution of manganese is effectively reduced, and the cycling stability of the material is improved.

The present invention provides a catalyst-layer-equipped electrolyte membrane and an application of the same, said catalyst-layer-equipped electrolyte membrane comprising: an anode catalyst layer containing an ionomer and an anode catalyst component that is composed of iridium-containing manganese dioxide, the molar ratio of iridium to manganese in the anode catalyst component being 0.011-0.182, and the logarithm log(amount of ionomer / amount of anode catalyst component) of the ratio of the amount of the ionomer to the amount of the anode catalyst component being −1.40 to −0.46; a proton exchange membrane; and a cathode catalyst layer.

The invention relates to the technical field of gas sensors, and particularly discloses an electrochemical formaldehyde sensor electrode, a preparation method thereof and an electrochemical formaldehyde sensor. The electrochemical formaldehyde sensor comprises an electrochemical formaldehyde sensor electrode and a binary electrolyte, the electrochemical formaldehyde sensor electrode comprises a polytetrafluoroethylene film, the polytetrafluoroethylene film is coated with slurry for an electrochemical formaldehyde sensor electrode; and the slurry is formed by mixing nano manganese dioxide, platinum carbon and a Nafion solution. According to the electrochemical formaldehyde sensor, the electrode prepared from the slurry formed by mixing the nano manganese dioxide, the platinum carbon and the Nafion solution has relatively high catalytic activity, so that the sensor shows extremely high sensitivity and extremely good linearity on formaldehyde, and the electrochemical formaldehyde sensor has relatively high catalytic activity by regulating and controlling the proportion of the binary electrolyte. The electrochemical formaldehyde sensor has the advantages of high sensitivity, low cost, fast response, high detection precision and the like.

The invention discloses an electrolyte for an aqueous manganese-based battery. The electrolyte comprises an electrolyte, and the electrolyte comprises a manganese salt; the weak acid is used for regulating and controlling proton dynamic release of the positive electrode / electrolyte interface to realize on-demand supply of protons of the positive electrode / electrolyte interface; and a solvent, wherein the solvent is deionized water; the PH range of the electrolyte is 2.0-3.5, and the electrolyte can realize on-demand supply of protons of a positive electrode / electrolyte interface in the charging and discharging process of the aqueous manganese-based battery, and promotes efficient and reversible deposition and dissolution reaction of a positive active substance manganese dioxide. According to the invention, the proton on-demand supply electrolyte is constructed by utilizing dynamic dissociation equilibrium of weak acid, so that on-demand supply of protons in the MnO2 dissolving process is realized, complete electrochemical dissolution of MnO2 is promoted, and generation of'dead manganese 'is inhibited, so that the cycling stability of the battery and the utilization efficiency of active substances are remarkably improved. The invention also discloses an aqueous manganese-based battery for realizing on-demand supply of protons and application of the aqueous manganese-based battery in the field of secondary energy storage.

The invention discloses a manganese hydrogen phosphate precursor, lithium iron manganese phosphate, a preparation method of the manganese hydrogen phosphate precursor, a positive pole piece containing the lithium iron manganese phosphate, a battery containing the lithium iron manganese phosphate, and an electric device containing the lithium iron manganese phosphate. The preparation method comprises the following steps: firstly, carrying out primary precipitation reaction on soluble manganese salt and a precipitator to prepare manganese hydroxide, and then carrying out secondary precipitation reaction on the manganese hydroxide and phosphoric acid to prepare the manganese hydrogen phosphate precursor. The manganese hydrogen phosphate precursor with low impurity ion content and high yield is prepared through secondary precipitation reaction.

The invention relates to the technical field of remediation for synergistic treatment of rice field soil arsenic and greenhouse gas emission reduction, in particular to a zero-valent manganese nitrate synergistic soil remediation agent and application thereof to remediation of rice field arsenic pollution and inhibition of greenhouse effect. The invention provides a technical scheme for synergistically repairing arsenic pollution in the rice field and inhibiting the greenhouse effect based on zero-valent manganese / nitrate, an electron transfer shunt network driven by manganese circulation is constructed, a slow release reaction-dynamic regeneration-electron shunt three-in-one system is constructed, and synergistic interaction of arsenic fixation and greenhouse gas emission reduction is realized. According to the technical scheme, the potential regulation and control contradiction between arsenic fixation aerobic and carbon reduction anaerobic is successfully broken, and an innovative solution is provided for multi-target remediation of rice field soil. According to the self-sustaining circulating system, the specific surface area of the manganese oxide is stabilized at 50m < 2 > / g to 120m < 2 > / g, and the regeneration rate is gt; 95%. Experiments show that compared with a single technology, the synergistic treatment group improves the arsenic fixing efficiency to 100%, and the comprehensive emission reduction intensity of greenhouse gas reaches 76%.

The invention discloses a device for treating black and odorous water in a constructed wetland in the field of sewage treatment, comprising: a fuel cell assembly comprising a reaction container, a cathode zone, an anode zone and a buffer zone from top to bottom in the reaction container, the cathode zone comprising a catalytic filler, the anode zone comprising an oxidation filler, and the buffer zone comprising a buffer filler; the oxidation filler is a composite material; the water passing assembly is communicated with the anode area and is used for slowly introducing black and odorous water into the anode area, and a plurality of horizontal water outlet pipes are vertically arranged on the reaction container at intervals; the current collection assembly is electrically connected with the anode region and the cathode region; the invention further discloses a manufacturing method. The fuel cell has the beneficial effects that the composite material prepared from the poly (butylene succinate), the manganese oxide and the manganese dioxide is used as the anode filler of the fuel cell, so that the formation of black and odorous substances can be reduced, and the treatment effect of the fuel cell on a black and odorous water body is improved.

An electrode structure for a solid-state or semi-solid-state battery is provided in which NCM electrode particles coated with an interphase layer and a nitrogen-containing carbon layer are disposed. [Solution] The NCM electrode particles comprise NCM (nickel-cobalt-manganese oxide) particles (15), primary particles (30) that coat the outer surfaces of the NCM particles, an interphase layer (16) that includes a glass phase layer (241) and a plurality of ceramic particles (242), and a nitrogen-containing carbon layer (35) that coats the exterior of the primary particles. Nitrogen-doped carbon molecules in the nitrogen-containing carbon layer aid in the conduction of electrons and lithium ions, modifying the electrical potential of the NCM particles. The nitrogen-containing carbon layer is formed by coating the surfaces of the primary particles with a nitrogen-containing polymer material and calcining the material in an inert atmosphere. Conjugated bonds are formed between the carbon and nitrogen, modifying the energy band structure, reducing the energy required for electrons to transition to the conduction band, and improving overall electronic conductivity.

The invention provides a lithium manganese iron phosphate positive electrode material and a preparation method and application thereof. The method comprises the following steps: mixing manganese metal and iron metal, heating, melting and uniformly mixing in an inert gas atmosphere, and grinding into powder; adding an ammonium salt solution, continuously adding the ground manganese-iron alloy powder under heating to form a suspension, introducing compressed air and stirring, reacting, filtering, washing, drying, crushing and grinding to obtain a manganese-iron oxide precursor, feeding the manganese-iron oxide precursor, a lithium source, a phosphorus source and doped metal elements into pure water, adding a carbon source, mixing to form a suspension, and grinding and drying to obtain the lithium-phosphorus-doped manganese-iron composite material. And carrying out carbon thermal reduction in an inert gas atmosphere, and crushing to obtain the lithium manganese iron phosphate positive electrode material. The ferromanganese oxide precursor prepared by heating the metal manganese and the metal iron to a molten state and mixing the metal manganese and the metal iron realizes uniform dispersion of the manganese and the iron at an atomic level, avoids the problems of nonuniform mixing of the manganese and the iron and dissolution of the manganese, and improves the conductivity and the electrochemical performance of the material.