200 results about "Oxalate salt" patented technology

The invention belongs to the technical field of catalysts, and particularly relates to a supported catalyst as well as a preparation method and application thereof. The preparation method of the supported catalyst provided by the invention comprises the following steps: mixing soluble transition metal salt, a carrier, an alkaline aqueous solution and water, and dipping to obtain a primary catalyst; the soluble transition metal salt comprises transition metal oxalate, transition metal formate or transition metal citrate; and carrying out microwave roasting on the primary catalyst to obtain the supported catalyst. According to the method, the transition metal salt is used as a roasting precursor, the transition metal is subjected to in-situ reduction in the reducing atmosphere generated during thermal decomposition of the transition metal salt in the roasting process, roasting and reduction are completed through microwave roasting one-step heating, the preparation steps are simplified, and meanwhile energy consumption is reduced. The supported catalyst is used in a catalytic condensation coupling hydrogen transfer reaction, has high conversion rate and coupling product selectivity, and can stably operate for a long time.

The present invention relates to a new method for preparing a ferromanganese oxalate precursor. The method comprises the following steps: mixing a water-soluble manganese salt, a water-soluble iron salt, a doping auxiliary agent 1 and a water-soluble oxalate in a water-organic solvent system, and subjecting same to a coprecipitation reaction. The present invention further relates to a method for preparing a lithium iron manganese phosphate positive electrode material. The method comprises the following steps: mixing the ferromanganese oxalate precursor with a lithium source, a phosphorus source and a doping auxiliary agent 2, drying same, then subjecting same to low-temperature roasting to obtain a lithium iron manganese phosphate precursor, mixing the precursor with an organic carbon source, then drying the mixture, and subjecting the mixture to high-temperature sintering, so as to obtain a carbon-coated lithium iron manganese phosphate positive electrode material. The present invention further relates to the ferromanganese oxalate precursor and the lithium iron manganese phosphate positive electrode material prepared by these methods.

The invention relates to a pressurized water reactor MOX fuel powder preparation method, which comprises: preparing a mixed actinide eutectic melt from a mixed actinide salt and a urea solid, and carrying out deamination, denitrification / decarbonization and reduction on the mixed actinide eutectic melt to directly obtain MOX fuel powder, the mixed actinide salt is hexavalent actinide nitrate and tetravalent actinide oxalate; when the mixed actinide salt is a uranyl nitrate hexahydrate solid and a thorium oxalate hexahydrate solid, the MOX fuel powder is (UxTh1-x) O2; when the mixed actinide salt is a uranyl nitrate hexahydrate solid and a plutonium oxalate hexahydrate solid, the MOX fuel powder is (UxPu1-x) O2. According to the method provided by the invention, the raw materials are simple, the preparation process flow of the MOX fuel powder composed of UO2 and PuO2 (or ThO2) can be greatly simplified, the use of process reagents is reduced, and no process waste liquid is generated, so that the MOX fuel powder preparation method which is simple, convenient, high in production efficiency, free of waste liquid and more economical and green is provided.

The invention discloses a comprehensive utilization method of high-salinity wastewater produced by hydrometallurgical treatment of bastnaesite, which comprises the following steps: A, mixing alkaline wastewater and acidic wastewater, neutralizing and clarifying to obtain calcium fluoride and sodium chloride wastewater; b, mixing the sodium chloride wastewater with the precipitation wastewater, adding lime water in an aeration manner to adjust the pH value, hydrolyzing heavy metal ions in the wastewater, and performing solid-liquid separation to obtain filter residues and filtrate which is sodium chloride high-salinity wastewater; and C, adding oxalic acid into the sodium chloride high-salinity wastewater, stirring, standing, carrying out solid-liquid separation, pressurizing, concentrating, recovering hydrochloric acid, and crystallizing to obtain a crystal substance, namely a sodium chloride product. According to the method, fluorine in the wastewater is removed firstly, then the wastewater is recovered into wastewater containing sodium chloride, oxalate is dissolved into the high-salinity wastewater to separate out sodium oxalate and recover hydrochloric acid, so that the content of sodium chloride in the system is greatly reduced, and the recovery efficiency of sodium ions in the wastewater is improved.

The invention relates to a preparation method of AnO2 type MOX fuel powder, which comprises the following steps: preparing a mixed actinide eutectic melt from a mixed actinide salt and a urea solid, and carrying out deamination and denitrification / decarbonization on the mixed actinide eutectic melt to directly obtain the AnO2 type MOX fuel powder, the mixed actinide salt consists of tetravalent actinide nitrate and tetravalent actinide oxalate; when the tetravalent actinide nitrate is a plutonium nitrate pentahydrate solid, a thorium nitrate hexahydrate solid or a U (NO3) 4.3-4H2O solid, and the tetravalent actinide oxalate is a thorium oxalate hexahydrate solid, a plutonium oxalate hexahydrate solid or an oxalic acid U (IV) solid, the AnO2 type MOX fuel powder is (ThxPu1-x) O2, (UxTh1-x) O2 or (UxPu1-x) O2 powder. According to the preparation method, plutonium nitrate / thorium nitrate / U (NO3) 4. 3-4H2O and thorium oxalate / plutonium oxalate / oxalic acid U (IV) are directly adopted as raw materials, the preparation process flow of the AnO2 type MOX fuel powder can be simplified, the use of process reagents is reduced, and no process waste liquid is generated, so that the preparation method of the MOX fuel powder, which is simple, convenient, high in production efficiency, free of waste liquid and more economical and green, is provided.

Method for preparing a catalyst composition comprising indium bismuth alloy which method comprises (a) combining at least an indium containing salt, a bismuth containing salt and an oxalate salt in a liquid to obtain a precursor mixture; (b) combining the precursor mixture with a reducing agent to obtain a suspension comprising the catalyst composition; and (c) separating the catalyst composition from the suspension, wherein a support material is either added to the precursor mixture or to the reducing agent, and to catalyst composition comprising indium bismuth alloy obtainable by this method.

The present invention concerns pharmaceutically acceptable salts of (S)-1-(1-(3-chlorophenyl)- 2-(dimethylamino)ethyl)-4-(5-morpholino-1H-pyrrolo[2,3-b]pyridin-3-yl)pyridin-2(1 H)-one of the formula (I) wherein said salt is selected from a hydrochloride salt, a maleate salt, an esylate salt, an oxoglutarate salt, a malonate salt and an oxalate salt.

The present invention discloses an accordion-shaped lignin cubic carbon material, a preparation thereof, and an application thereof in a supercapacitor. The preparation method comprises the following steps: firstly, dissolving industrial lignin in an alkali solution and purifying in a weak acid solution; then forming, with a block copolymer, a mixed micelle of the lignin / the block copolymer in a mixed solvent of alcohol and water, then sequentially adding a soluble zinc salt and a soluble oxalate, and carrying out solvent evaporating induction under a neutral condition to co-deposit the mixed micelle and zinc oxalate, with an evaporation rate at the same time, to deposit the mixed micelle of lignin / block copolymer between zinc oxalate layers, to construct a cubic lignin / block copolymer / zinc oxalate complex with ordered structure; and after finally carbonizing, obtaining an accordion-shaped lignin cubic carbon material. This material has a rich ion migration space and is internally provided with interconnected supporting nanosheet layers so that the problem that carbon nanosheets are easy to accumulate is solved, the effective surface utilization rate is improved, and performances of the mass, the area-specific capacitance and the rate capability of a supercapacitor are remarkably improved.

The invention belongs to the technical field of sodium ion battery materials, and particularly relates to a method for preparing a mixed type phosphate sodium ion positive electrode material by using a chelating agent to assist transition metal salt. The preparation method comprises the following steps: preparing a phosphorus source, a sodium source and transition metal oxalate according to the stoichiometric ratio of a P element, a sodium element and an M element in Na4Mx (PO4) 2P2O7, then adding the phosphorus source, the sodium source and the transition metal oxalate together with a carbon source and a chelating agent into deionized water, uniformly mixing, grinding, collecting precursor powder, and sintering to obtain the mixed phosphate sodium ion positive electrode material. The transition metal oxalate is adopted, no impurity phase is introduced in the preparation process, the chelating agent is used for auxiliary preparation, the problem of non-uniform mixing of the raw materials is solved, the obtained mixed phosphate sodium ion positive electrode material has excellent cycle stability, and support is provided for industrial preparation of the sodium ion battery mixed phosphate positive electrode material.

The method comprises the following steps that carbonate is added into the alkaline vanadium liquid, the concentration of V in the alkaline vanadium liquid ranges from 10 g / L to 30 g / L, the concentration of impurities Al, Ca, Fe, Mn, Si and P does not exceed 1 g / L, and the concentration of other impurities does not exceed 0.05 g / L; adding a calcium salt impurity removing agent to obtain purified vanadium liquid; and oxalate is added into the purified vanadium liquid to obtain deeply-purified vanadium liquid. According to the scheme, Al, Ca, Fe, Mn, Si and P impurities in the alkaline vanadium liquid are deeply removed in a short process, the impurity concentration after purification can be reduced to 0.01 g / L or below, short-process deep impurity removal of the vanadium liquid is achieved, impurity removal slag generated by impurity removal can serve as a calcium salt roasting additive to be returned for use, meanwhile, vanadium is recycled, the vanadium loss rate is low, and the production cost is effectively reduced.

The invention relates to the technical field of water pollution treatment, in particular to application of a cerium salt coagulant in water treatment. The specific application method comprises the following steps: adding the cerium salt coagulant into a to-be-treated water body under stirring, carrying out a coagulation reaction, and settling floc generated by the coagulation reaction to obtain the treated water body, the cerium salt coagulant is cerium-containing nitrate, ammonium nitrate, chlorine salt, sulfate or oxalate; the water body to be treated is a water body containing organic matter-turbidity or algae. The invention solves the problem that the conventional treatment process has low removal effect on algae and organic pollutants in water and the problems of narrow applicable pH range, poor coagulation effect at low temperature and high concentration of residual metal ions in the application process of the traditional coagulant.

Captured carbon dioxide, preferably carbon dioxide captured from emissions such as carbon dioxide from flue gas emissions, can be provided in the form of purified carbon dioxide after undergoing one or more purification processes, such that the purified carbon dioxide is capable of being utilized in the formation of one or more other economically viable chemicals, such as an oxalate salt and / or oxalic acid via an electrochemical reduction process. The electrochemical reduction process utilizing a modified cathode having a metal coating for the efficient and high yield of oxalate salt and / or oxalic acid. The economically viable chemicals derived from captured carbon dioxide capable of being utilized in other applications including the treatment of waste-products, such as in the neutralization of red mud and / or the extraction of rare earth minerals from neutralized red mud.

The invention belongs to the technical field of medicine crystals, and relates to cordycepin-oxalate as well as a preparation method and application thereof. The invention relates to a preparation method of cordycepin-oxalate. The preparation method comprises the following steps: (1) physical mixing: sufficiently and uniformly mixing oxalic acid and cordycepin-crystal form II crystals; (2) liquid auxiliary grinding: adding an auxiliary agent, and continuously grinding to obtain a solid mixture; and (3) drying the solid mixture to obtain the cordycepin-oxalate. According to the method, the cordycepin-oxalic acid eutectic salt is prepared for the first time, the dissolution rate of the cordycepin-oxalic acid eutectic salt is obviously lower than the dissolution rate of cordycepin reported in the prior art, and the cordycepin-oxalic acid eutectic salt has extremely high potential medicinal application value. The cordycepin-oxalic acid eutectic salt has important technical innovation and market application potential due to the slow release effect.

The invention discloses a lithium-rich manganese-based solid-state battery positive electrode active material and a preparation method and application thereof, and the preparation method comprises the following steps: S1, taking a manganese salt, a cobalt salt and a nickel salt, and preparing a mixed salt solution; s2, adding an oxalic acid solution into the mixed salt solution, and stirring to form an oxalate precipitate; s3, carrying out vacuum drying and collecting precipitates to obtain an oxalic acid precursor; s4, mixing and uniformly grinding the oxalic acid precursor, LiOH and Li2WO4 to obtain mixed powder; and S5, pre-sintering the mixed powder, then calcining, and naturally cooling to room temperature to obtain the composite material. The invention also discloses the lithium-rich manganese-based solid-state battery positive electrode active material prepared by the preparation method, and a battery positive electrode and a solid-state battery comprising the active material. Li2WO4 is introduced into the lithium-rich manganese-based solid-state battery positive electrode material to construct a Li < + > / e <-> transmission channel, so that the initial specific capacity of the battery is increased; and a protective layer is formed on the surface of the positive electrode material to enhance the redox reversibility and improve the cycle stability of the battery.

The invention relates to the technical field of hazardous waste treatment, in particular to a method for extracting rare earth elements from gasification furnace slag and preparing foam microcrystalline glass from the gasification furnace slag and fly ash. The method comprises the following steps: mixing the gasification furnace slag with small molecular organic acid, uniformly stirring, and controlling the pH value to be 3-5; filtering, and respectively collecting solid residues and leachate; adding oxalate into the leachate in batches to separate rare earth elements, and filtering to obtain the rare earth elements and waste liquid; the method comprises the following steps: mixing organic incineration fly ash and solid residues, grinding, heating in a corundum crucible, and preserving heat to obtain a basic glass melt; carrying out water quenching or room temperature cooling on the basic glass melt to obtain glass slag, and drying to constant weight; glass slag is added into the waste liquid, a certain amount of calcium carbonate is added for mixing, injection molding and curing are conducted, and then demolding is conducted to obtain a foaming blank; and drying and sintering the foamed blank to obtain the foam microcrystalline glass. According to the method, hazardous waste materials are completely utilized, the preparation process is simple, and the waste utilization rate is high.

The invention discloses a method and device for continuously preparing lithium difluoro (oxalato) borate and a lithium difluoro (oxalato) borate solution, and belongs to the technical field of electrolyte salt synthesis, the method comprises the following steps: continuously pumping chlorosilane and a first mixed solution formed by oxalate and an ester solvent into a first dynamic microchannel reactor, and carrying out a first reaction to obtain a reaction product, wherein the mass flow ratio of the first mixed solution to the chlorosilane is (4-10): 1; continuously pumping the reaction product into a second dynamic micro-channel reactor, continuously pumping a second mixed solution formed by lithium tetrafluoroborate and an ester solvent into the second dynamic micro-channel reactor, and carrying out a second reaction at a temperature of 20-70 DEG C and a rotating speed of 200-400 r / min to obtain a mixed reaction solution; and separating a reaction product in the mixed reaction liquid to obtain the lithium bis (fluoro) oxalato borate. According to the method for continuously preparing the lithium difluoro (oxalato) borate, the continuous production of the lithium difluoro (oxalato) borate can be realized, and the quality of the lithium difluoro (oxalato) borate is high.

The invention discloses a method for recycling retired lithium iron phosphate batteries and producing iron phosphate. The method comprises the following steps: adding alkali into a mixed solution containing Fe < 3 + >, Li < + > and PO4 < 3-> obtained after acid leaching to adjust the pH value, separating out an iron phosphate solid, reacting iron phosphate with acid and a reducing agent, and then reacting with oxalate, so that the iron element is mainly recovered in the form of ferrous iron; reacting the lithium salt solution by a method of adding an alkaline carbonate solution or introducing carbon dioxide gas to generate lithium carbonate precipitate, and recovering lithium carbonate; the recycled ferrous chloride can be used for preparing a ferric iron solution, and the ferric iron solution is directly used for producing iron phosphate, so that the iron element is regenerated and reused in the lithium iron phosphate.

A quinazoline derivative (represented by the formula (I)) salt's crystal form, a preparation method and application are provided; specifically, the hydrochloride crystal form A, B, C, D, F, H, I, Sulphate crystal form A, Maleate crystal form A, Succinate crystal form A, Adipate crystal form A, Glycolate crystal form A, Malate crystal form A, Fumarate Salt crystal form A, besylate crystal form A, B, C, benzoate crystal form A, hippurate crystal form A and oxalate crystal form A of the quinazoline derivative represented by formula (I). The salt crystal form provided by the present invention has good stability, which can be used in the treatment of non-small cell lung cancer brain metastasis, meningeal metastasis, primary brain cancer or glioma, etc., and has good bioavailability, which is of great significance for further research on the efficacy of such solid drugs.

The invention relates to a preparation method of large-granularity cobaltosic oxide for a battery, and belongs to the technical field of battery preparation. The preparation method comprises the following steps: dissolving cobalt salt in deionized water to obtain a high-concentration cobalt ion solution, mixing sodium oxalate and niobium ammonium oxalate for use to form a specific precursor structure, carrying out a co-precipitation reaction on cobalt ions, oxalate and niobium ammonium oxalate in an aqueous solution to generate a cobalt-containing oxalate and niobate compound precipitate, and carrying out solid-liquid separation on the cobalt-containing oxalate and niobate compound precipitate. Then hydrogen peroxide is used for promoting oxidation of cobalt ions, and formation and crystallization of cobalt oxalate precipitates are further promoted; in the preparation process, water is effectively removed through freeze drying, meanwhile, the morphology and structure of precipitates are kept, organic matter and volatile impurities are removed in the roasting and re-roasting process, and formation and stability of a cobaltosic oxide crystal structure are promoted; the stable crystal structure is favorable for prolonging the cycle life and improving the safety of the battery.

The application belongs to the technical field of lithium ion batteries, and discloses a ternary high-voltage lithium ion battery nonaqueous electrolyte and a lithium ion battery. The ternary high-voltage lithium ion battery nonaqueous electrolyte comprises a nonaqueous organic solvent, an electrolyte lithium salt and an electrolyte additive. The additive comprises a film-forming additive, an oxalate type additive and a silane type additive. The film-forming additive comprises a phosphorus-containing sulfonate compound. The structure formula of the phosphorus-containing sulfonate compound is shown as formula (I): wherein the substituents R1, R2 and R3 are independently selected from alkyl, alkoxy, ester, alkenyl, alkyne, fluoroalkyl, cyano and isocyanate with 1-4 carbons. The electrolyte of the application has high energy density and high stability by optimizing the formula and under the joint action of a unique combination of multiple components, which is beneficial to meet the demand of the electrolyte for cycle and storage performance under high voltage, and ensures safety.

The present invention belongs to the technical field of sewage treatment, and discloses a long-acting slow-release sludge denitrifying flora regulating agent, a preparation method and an application thereof. The preparation method includes: uniformly mixing dolomite powder, hydroxylamine-O-sulfonic acid powder and ethylhydrazine oxalate powder to obtain a composite powder; mixing hydroxypropyl cellulose with an ethanol aqueous solution to obtain a sizing agent; mixing the composite powder and the sizing agent and preparing the long-acting slow-release sludge denitrifying flora regulating agent through a granulation technique. The agent of the present invention can be applied in the process of treating nitrogen-containing wastewater, and can quickly regulate the flora structure to realize the start-up and performance optimization of the nitrite-based sewage denitrification process.

A preparation method of N '-((2S, 3S)-2-(benzyloxy) pent-3-yl) formylhydrazine oxalate enzyme belongs to the field of medical intermediates, and comprises the following steps: step 1, preparing a buffer solution of a compound enzyme preparation; step 2, adding (2S)-2-benzyloxy-3-pentanone into a solvent A, and then adding a buffer solution of the compound enzyme preparation for reaction; 3, filtering, and carrying out an activation reaction on the filtrate; 4, filtering, removing the solvent, adding the obtained solid into a solvent B, and then adding formylhydrazine for reaction; 5, filtering, removing the solvent, adding the obtained solid into a solvent C, and then adding oxalic acid for reaction; and 6, drying the solid obtained by filtering to obtain the N '-((2S, 3S)-2-(benzyloxy) pent-3-yl) formylhydrazine oxalate. According to the method, the yield of the N '-((2S, 3S)-2-(benzyloxy) pent-3-yl) formylhydrazine oxalate can be increased, and the production cost is effectively reduced.

The invention provides a preparation method of superfine square cobalt oxalate and superfine sphere-like cobalt powder, and belongs to the field of nonferrous metal production. The preparation method of the superfine square cobalt oxalate comprises the following steps: providing an oxalate-containing mixed solution, wherein the oxalate-containing mixed solution comprises oxalic acid and soluble oxalate; providing a cobalt ion-containing mixed solution, wherein the cobalt ion-containing mixed solution comprises soluble cobalt salt and a nonionic surfactant with an oxygen-containing group; and mixing the cobalt ion-containing mixed solution and the oxalate-containing mixed solution, carrying out a precipitation reaction, collecting a solid material in the obtained reaction material liquid, and drying the solid material to obtain the superfine square cobalt oxalate. The cobalt oxalate square particles with the Fisher particle size smaller than 1 micron are prepared by inhibiting the single-direction growth of cobalt oxalate crystals and regulating and controlling the growth rate of cobalt oxalate crystal nucleuses, a good precursor is provided for preparing superfine sphere-like cobalt powder, and the requirement of hard alloy for the cobalt powder is met.

The invention provides a method for synergistically removing oxalate and carbonate in a sodium aluminate solution, and belongs to the technical field of metal smelting. Oxalate is removed from mother liquor to be subjected to decarburization, so that the harmful influence of oxalate crystallization is removed, and subsequent filtration and causticization are facilitated; meanwhile, heat of the first filtrate and the second filtrate is recovered through the heat exchanger, and system energy loss is reduced; in addition, filtrate obtained by filtering the causticized slurry is conveyed to a grader, so that the washing efficiency of the red mud settling and washing procedure is not influenced, the internal circulation of the seed precipitation mother liquor is reduced, and the utilization efficiency of alkali is improved; and finally, unreacted calcium hydroxide in a third filter cake obtained by separating causticized slag after causticization and the refined sodium aluminate solution are subjected to slurrying reaction to generate 3CaO. Al2O3. 6H2O with good crystallinity, and the 3CaO. Al2O3. 6H2O is used as a filter aid with a good effect, so that the use amount of lime milk can be saved, and the production cost is saved. In conclusion, the method saves raw materials, can be continuously operated, is high in operation efficiency and low in operation cost, and is beneficial to purifying the solution and improving the overall production efficiency.

This application relates to a lithium secondary battery electrolyte solution, a secondary battery, and an electrical device. The lithium secondary battery electrolyte solution includes an organic solvent and a first additive, a second additive, and an electrolyte salt that are dissolved in the organic solvent. The organic solvent includes a carboxylate solvent. A mass percent W1 of the carboxylate solvent in the organic solvent is 20% to 80%. The first additive includes one or more of monofluorophosphate, difluorophosphate, tetrafluoroborate, fluorosulfonate, oxalate borate, malonate borate, oxalate phosphate, or malonate phosphate. The second additive includes one or more of vinylene carbonate or a derivative thereof, or ethylene carbonate or a derivative thereof. The mass percent of the first additive and the mass percent of the second additive in the electrolyte solution are W2 or W3 respectively, satisfying: 0.035 ≤ (W2 + W3) / W1 ≤ 0.15. The electrolyte solution hereof makes the secondary battery superior in fast-charge performance, cycle performance, and storage performance.

The invention relates to the field of hydrometallurgy, and discloses a method for converting hafnium oxalate feed liquid into hafnium sulfate feed liquid, which comprises the following steps: adding a sulfuric acid solution and an oxidizing agent into the hafnium oxalate feed liquid, and reacting at a certain temperature to obtain the hafnium sulfate feed liquid. Oxidants used in the method are preferably hydrogen peroxide and ozone, other impurity ions are not introduced, and the purity of the product is not influenced at all. Oxidation products are H2O and CO2 and are basically free of pollution to the environment. The process of evaporation, filtration, calcination, redissolution and the like of a traditional evaporation method and an alkali precipitation-redissolution method is not needed, the operation is simple, the efficiency is high, the cost is low, and the operability is high. The method for adding the sulfuric acid solution and the oxidizing agent into the oxalate feed liquid is also suitable for converting oxalate solutions of other metal ions into sulfate solutions, including but not limited to zirconium oxalate, titanium oxalate, thorium oxalate, scandium oxalate, niobium oxalate, tantalum oxalate, vanadium oxalate, cobalt oxalate, cesium oxalate and rubidium oxalate.

The present invention discloses a Prussian blue-based sodium-ion battery positive electrode material, a preparation method, and applications thereof. The method comprises: mixing sodium ferrocyanide, oxalate, and a non-aqueous solvent, subjecting the mixture to a ball-milling reaction, and washing the product after the ball-milling reaction to remove unreacted raw materials and a portion of sodium oxalate generated by the reaction, thereby obtaining the Prussian blue-based sodium-ion battery positive electrode material. The present invention can synthesize Prussian blue-based compounds with low defects and low interstitial water molecule content, thereby improving the sodium storage performance and capacity utilization of such materials; it also reduces the probability of side reactions in the electrolyte causing cell bloating. In addition, the use of oxalate-based raw materials can also generate a sodium oxalate-based positive electrode sodium supplement during the synthesis of the Prussian blue-based compound, thereby replenishing sodium ion loss caused by SEI film formation or other side reactions during the initial charge.

The invention provides a spherical nickel oxide material and a preparation method thereof. The preparation method comprises the following steps: S1, carrying out first mixing on raw materials including a nickel salt solution and an alkali solution to obtain a first mixed solution; s2, performing second mixing on raw materials including the first mixed solution, a surfactant and a dispersing agent to obtain a second mixed solution; s3, sequentially carrying out third mixing and aging reaction on raw materials comprising the second mixed solution and an oxalate solution to obtain a third mixed solution; and S4, sequentially centrifuging, washing, drying and roasting the third mixed solution to obtain the spherical nickel oxide material, wherein the pH value of the first mixed solution is 5.0-6.8; the roasting temperature is 300 to 550 DEG C; according to the preparation method, the needle-shaped spherical nickel oxide material with uniform particle size can be obtained, so that the surface activity and the specific surface energy of the nickel oxide material are enhanced, and the nickel oxide material can be better applied to the fields of gas sensitive materials and the like.

The invention discloses an additive for a secondary battery, a non-aqueous electrolyte for the secondary battery and the secondary battery, the electrolyte comprises a main salt, a non-aqueous solvent and an additive, the main salt is selected from a main lithium salt or a main sodium salt, the additive at least comprises a diester compound shown as a structural formula (I), and can also comprise boron-containing oxalate and a basic additive, the specific structure is shown in the specification. By adding the diester compound into the electrolyte, the initial impedance of the battery can be effectively reduced, the low-temperature discharge performance is improved, and meanwhile, the high-temperature storage and high-temperature circulation of the battery are improved.

A battery circulating lithium ions includes a positive electrode including an electroactive material including an oxide containing lithium and manganese, and an electrolyte permeating the positive electrode. The electrolyte includes an organic solvent, a lithium salt in the organic solvent, and an oxalate-based additive in the organic solvent. The oxalate-based additive includes at least one oxalate compound selected from the group consisting of bis (2, 2, 2-trifluoroethyl) oxalate, tert-butyl 2, 2, 2-trifluoroethyl oxalate, methyl 2, 2, 2-trifluoroethyl oxalate, ethyl 2, 2, 2-trifluoroethyl oxalate, bis (2-chloroethyl) oxalate, and diethyl oxalate.