77results about How to "Reduce dissolution" patented technology

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium manganese iron phosphate particles, a first shell layer and a second shell layer, the first shell layer and the second shell layer sequentially coat the surfaces of the lithium manganese iron phosphate particles, the material of the first shell layer comprises nanoscale SiO2 particles, and the material of the second shell layer comprises nanoscale TiO2 particles. The surfaces of the lithium manganese iron phosphate particles are sequentially coated with the SiO2 layer and the TiO2 layer, so that the contact between the lithium manganese iron phosphate particles and an electrolyte can be reduced, the side reaction between the lithium manganese iron phosphate particles and the electrolyte in the electrochemical reaction process is reduced, the cycle life attenuation of the battery is relieved, the dissolution of Mn element is reduced, and the service life of the battery is prolonged. Therefore, the battery impedance increase caused by deposition of Mn < 2 + > on the negative electrode in the circulation process is relieved.

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 provides a PtCo-based composite catalyst and a preparation method and application thereof.The PtCo-based composite catalyst comprises a carrier and a load, the carrier comprises mesoporous carbon, the load comprises platinum-cobalt-based metal particles and a compound with the chemical formula being HxMO3, and M comprises W or / and Mo; a contact interface exists between the platinum-cobalt-based metal particles and the compound with the chemical formula of HxMO3; the platinum-cobalt-based metal particles comprise a first part of the platinum-cobalt-based metal particles, and the first part of the platinum-cobalt-based metal particles are supported in the mesoporous structure of the mesoporous carbon. According to the PtCo-based composite catalyst, a contact interface exists between HxMO3 and PtCo-based metal particles, the catalytic activity of platinum and cobalt can be improved, and reduction of oxygen on the surface of the catalyst is facilitated; part of platinum-cobalt-based metal particles are supported in a mesoporous structure of mesoporous carbon, so that the stability of the catalyst can be improved.

The invention belongs to the field of battery materials, and particularly relates to a LiAlO2 coated lithium-rich manganese-based material as well as a preparation method and application thereof. The invention provides a preparation method of a LiAlO2 coated lithium-rich manganese-based material, which comprises the following steps: (1) mixing a precursor and a first lithium salt, and carrying out first sintering to obtain a first sintered material; (2) carrying out acid pickling on the first sintering material, mixing the first sintering material with an aluminum source and a second lithium salt, and carrying out second sintering to obtain a LiAlO2 coated lithium-rich manganese-based material; and carrying out acid pickling by adopting an organic acid solution. The LiAlO2 coated lithium-rich manganese-based material prepared by the preparation method disclosed by the invention is low in specific surface area, high in first efficiency and good in cycle performance.

The invention relates to a formula of a high-performance sodium-ion battery electrolyte, and aims to improve the cycle life, safety and rate capability of a sodium-ion battery. The electrolyte comprises sodium hexafluorophosphate as a sodium salt, carbonic ester as an organic solvent and a plurality of additives (fluoroethylene carbonate, bis (2, 2, 2-trifluoroethyl) carbonate, ethylene sulfate, 1, 3-allyl sultone and sodium difluoro (oxalato) borate). Through the synergistic effect of the additives, a stable positive electrode / electrolyte interface film (CEI) is formed, cation dissolution is reduced, and the sodium ion transmission performance and the high-voltage stability of the battery are improved. In a half cell assembled with a NaNi0. 4Fe0. 2Mn0. 4O2 positive electrode, when the electrolyte works in a voltage range of 2-4.2 V, the specific discharge capacity of more than 160mA. H / g is provided, and the capacity retention ratio exceeds 80% after 200 cycles at the rate of 1C.

The invention discloses a method for green and efficient extraction of functional components in spina date seeds. The method comprises the following steps: crushing spina date seeds, removing seed coats and endosperm, deoiling cotyledons with petroleum ether, performing low-temperature water extraction on peeled and deoiled spina date seed powder, filtering and clarifying extract liquid with a hollow fiber membrane or a ceramic membrane, performing reverse osmosis concentration to remove most of water, and drying concentrated liquid to obtain the spina date seed extract highly enriched with functional components. In the extraction process, petroleum ether is used in the deoiling part, only water is used in the other steps, no solvent with obvious toxicity and pollution is used in the whole extraction method, the method has the advantages of safety, environmental protection, simple process, low cost, good extraction effect and the like, and the obtained extract is green and safe, can be directly used in the fields of medicines, foods and the like, and has wide application prospects. And by-products such as seed coats and endosperm of spina date seeds, extracted spina date seed oil and spina date seed starch and protein settled at the bottom after extraction can be further utilized and developed, so that more additional values are created for enterprises.

The invention provides an electrolyte, a preparation method thereof and a lithium ion battery, the electrolyte comprises an organic solvent, an additive and a lithium salt, and the additive comprises an additive A. The additive A is added into the electrolyte, and the imidazole group in the additive A enables the additive A to participate in positive electrode film formation and negative electrode film formation, so that the stability of a solid electrolyte interface film is improved; in addition, the additive A can be used as a Lewis base to capture H2O and corrosive substances such as phosphorus pentafluoride and hydrofluoric acid in the battery, so that side reactions between water, gas and the corrosive substances and other components in the battery are reduced; in addition, the cyano group, the cyanoethyl group or the dimethylene cyano group and other groups in the additive A can be used as Lewis base to adsorb hydrofluoric acid. And the additive A can improve the stability of interface films of the positive and negative solid electrolytes and reduce side reactions between water, gas and corrosive substances and other components in the battery, so that the high-temperature storage performance and the cycle performance of the battery are improved.

The invention provides toughened anti-cracking and anti-corrosion solid waste concrete and a preparation method thereof. Mixing the cement, the fly ash, the slag and the natural aggregate; sequentially adding water, a weakly alkaline regulator and an additive solution containing a polycarboxylic acid water reducer to obtain concrete slurry; and curing to obtain the product. According to the invention, fly ash, slag solid waste and natural aggregate are used as aggregate, a water reducer is added to reduce the water consumption of concrete and improve the fluidity of concrete, and specially-made weakly-alkaline conditioning agent particles are introduced, so that the self-water-absorption-water-release behavior and bridging effect of the particles are utilized to improve the concrete fluidity. The early-stage and later-stage continuous hydration ability of a rubber material in the concrete is enhanced, the self-shrinkage and drying shrinkage resisting effects are achieved, the compactness and corrosion resistance of the concrete are improved, and then the anti-cracking ability of the all-solid waste concrete is improved. The surface of an obtained test piece is free of cracks, the 28d compressive strength reaches 46.6 MPa, the 28d breaking strength reaches 8.5 MPa, the self-shrinkage rate is 0.035%, and the drying shrinkage rate is 0.01%.

The purpose of the present invention is to improve the life of a battery using a negative electrode comprising a metal by reducing the amount of gas generation, reducing the resistance, and reducing the amount of metal elements such as Mn and Ni deposited in a positive electrode in the negative electrode. A secondary battery having a liquid electrolyte and a negative electrode in which a fluoropolymer is laminated on a layer containing a metal, the secondary battery being characterized in that: the metal is at least one type selected from the group consisting of lithium, sodium, magnesium and zinc; the fluoropolymer is a copolymer having a vinylidene fluoride unit (A) and a structural unit (B) of at least one monomer selected from the group consisting of tetrafluoroethylene, trifluoroethylene, chlorotrifluoroethylene, a monomer represented by general formula (1), a monomer represented by general formula (2), and a monomer represented by general formula (3), and the liquid electrolyte contains a fluorinated ether. [chemical formula 1] # imgabs0 # [chemical formula 2] # imgabs1 # [chemical formula 3] # imgabs2 #

The invention belongs to the technical field of sample injection isolation pads, and discloses a low-volatility and low-dissolution silica gel isolation pad and a preparation process. The silica gel shock insulator is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 40 to 50 parts of fumed silica, 8 to 10 parts of mixture of hexamethyl cyclotrisilazane and octamethyl cyclotetrasilazane, 0.5 to 0.8 part of diethyl maleate, 2 to 3 parts of diphenyl silanediol, 3 to 5 parts of titanium dioxide and 0.5 to 1 part of vulcanizing agent. According to the invention, through reasonable formula design and optimization of the types and contents of the raw materials, the molded rubber material is ensured to have a relatively good crosslinking degree, vulcanized small-molecular products are effectively prevented from excessively migrating to the surface, and meanwhile, part of small-molecular substances are extracted in advance by adopting a specific production process, so that the service life of the rubber material is prolonged. The product is ensured to have better cleanliness in the subsequent use process, and the low-volatility and low-dissolution silica gel insulation pad is obtained.

This utility model discloses a modular electrolytic reaction tank for preparing high-purity metallic magnesium, belonging to the field of metallic magnesium reaction tanks. It includes a reaction tank body, with a cover plate fixedly connected to the upper surface of the body by multiple bolts. A conveying pipe is fixedly connected to the left side of the upper surface of the cover plate. A collection box is fixedly connected to the right side of the lower inner surface of the reaction tank body. A through-type collection port is opened on the upper left side of the inside of the collection box. This utility model achieves efficient and rapid separation through the unique structure of the collection box and related components. When the liquid magnesium reaches a certain thickness, the level gauge detects a signal, the electric push rod is activated, pushing the sliding plate two. Through the gas box and gas delivery hole, the sliding plate one moves the baffle one upward, opening the collection port. Liquid magnesium quickly flows into the collection box, greatly reducing the residence time of liquid magnesium in the reaction tank body, effectively reducing impurity dissolution, and improving the purity of metallic magnesium and product quality.

The invention provides an organic-inorganic hybrid solid-state polymer electrolyte coated high-nickel positive electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium batteries. The high-nickel positive electrode material coated with the organic-inorganic hybrid solid polymer electrolyte comprises an inner core and an organic-inorganic hybrid coating layer coated on the surface of the inner core, the inner core is made of a high-nickel positive electrode material; the organic-inorganic hybrid coating layer comprises a ring-opening copolymer of maleic anhydride and 1, 3-dioxolame, and Li3PO4 nanocrystals are embedded into the ring-opening copolymer of maleic anhydride and 1, 3-dioxolame in situ. According to the invention, a flexible and compact coating layer with ionic conductivity is constructed on the surface of the high-nickel positive electrode material, so that the problems of violent interface side reaction, large interface impedance and poor cycling stability existing between the high-nickel positive electrode material and sulfide solid electrolyte are solved; therefore, the electrochemical performance of the material in a sulfide all-solid-state lithium battery is remarkably improved.

The invention discloses a lithium iron manganese phosphate composite material and a preparation method and application thereof, belonging to the technical field of lithium batteries. The composite material comprises the following raw materials: a lithium source, a manganese source, an iron source, phytic acid, graphene oxide, polyvinyl alcohol, pyrrole and a dopant. The invention adopts a hydrothermal method to make hydroxyl groups on the surface of graphene oxide react with phytic acid to obtain a mixed solution a, and similarly obtains a mixed solution b containing polyvinyl alcohol phytate, combines a manganese source, a lithium source and an iron source, prepares a semi-finished product by roasting, and then coats a doped polypyrrole layer on the surface of the semi-finished product to finally obtain a lithium iron manganese phosphate composite material with a three-dimensional structure. The three-dimensional structure is a composite structure of a rod-like structure and a sheet structure. Compared with the lithium iron manganese phosphate material with a single morphology in the prior art, the specific surface area is significantly improved, the stability is stronger, the contact area with the electrolyte is larger, and the diffusion efficiency of lithium ions and the charge and discharge performance of the battery are improved.

The invention discloses a lithium manganate positive electrode material, a preparation method and an applied lead-lithium battery, relates to the technical field of lithium manganate positive electrode materials, and solves the problems that the existing lithium manganate positive electrode material is poor in structure and interface stability and poor in rate and cycle performance. The positive electrode material is composed of a lithium manganate matrix and a double-layer composite coating, the matrix is prepared by taking lithium carbonate and manganous-manganic oxide as raw materials and doping magnesium hydroxide, aluminum hydroxide and titanium dioxide multi-plasma phase; the lithium manganate positive electrode material is prepared by uniformly compounding a lithium manganate matrix modified by a spinel inner layer, vinyl functionalized MOF and a polyvinylidene fluoride-hexafluoropropylene copolymer on the surface of an aluminum foil receiver through an electrospinning-electrospray synergistic process. The material is applied to the lead-lithium battery, shows excellent electrochemical performance and has good practical application value.

This disclosure relates to a negative electrode, a battery cell, a battery device, and an electrical device. The battery cell includes a negative electrode, a positive electrode, a separator, and an electrolyte. The negative electrode includes a composite current collector, which comprises a first metal layer, a second metal layer, and a polymer layer, with the polymer layer located between the first and second metal layers. The polymer layer includes a polymer matrix and an inorganic salt hydrate. The polymer matrix has multiple porous structures, and the inorganic salt hydrate is located within these porous structures. The battery cell of this disclosure can effectively reduce the severity of its thermal runaway reaction, thus reducing the occurrence of catastrophic events.

This application provides a positive electrode active material and a preparation method thereof, a positive electrode plate, a secondary battery, a battery module, a battery pack, and an electric apparatus. The positive electrode active material includes a core containing LimAxMn1-yByP1-zCzO4-nDn, a first coating layer enveloping the core and containing a crystalline pyrophosphate LiaMP2O7 and / or Mb(P2O7)c, a second coating layer enveloping the first coating layer and containing an oxide M'dOe, and a third coating layer enveloping the second coating layer and containing carbon. The positive electrode active material of this application can reduce Li / Mn anti-site defects produced, reduce dissolving-out amount of manganese, lower the lattice change rate, increase the capacity of the secondary battery, and improve the cycling performance, high-temperature storage performance, and safety performance of the secondary battery.

The invention discloses a lithium manganate battery and a preparation method thereof. The lithium manganate battery comprises a positive plate, a diaphragm, a negative plate and a functional diaphragm, the functional diaphragm comprises CaO2 and a multi-dimensional conductive carbon material; the functional diaphragm is arranged between the positive plate and the diaphragm, and / or the functional diaphragm is arranged between the negative plate and the diaphragm, HF in an electrolyte is consumed through alkaline compounds in the functional diaphragm, dissolution of manganese in the positive electrode is reduced, but interface impedance can be increased through an interface layer composed of the independent alkaline compounds, so that the performance of the lithium ion battery is improved, and the service life of the lithium ion battery is prolonged. Therefore, in combination with the multi-dimensional conductive material, the porous structure of the multi-dimensional conductive material can adsorb and intercept the dissolved manganese, and meanwhile, the alkaline compound material can be uniformly distributed in a conductive pore channel, so that the damage to the negative electrode is reduced, and the high-temperature cycle and high-temperature storage performance of the battery is improved.

The invention relates to an electrolyte additive, a non-aqueous electrolyte and a battery, belongs to the technical field of lithium ion batteries, and is used for solving at least one of the problems of poor cycle life, serious gas production of a battery cell and the like of an existing lithium-rich manganese-based battery under relatively high charging voltage. The electrolyte additive comprises a silicon nitrile compound and a trithio phosphite compound, the additive forms a CEI / SEI film on the surface of a positive electrode material and the surface of a negative electrode material prior to a solvent under the high voltage (larger than or equal to 4.5 V), Si, P and S remarkably improve the stability and lithium ion conducting performance of the interface film, therefore, oxidation-reduction decomposition of the electrolyte is effectively inhibited, and the service life of the electrolyte is prolonged. The battery cell cycle life is prolonged.

The invention relates to the field of batteries, in particular to a thiophene compound and a preparation method thereof, an electrolyte and a battery. The structural formula of the thiophene compound is as shown in formula I, specifically, the thiophene compound containing cyano and sulfamido is obtained by carrying out electrophilic aromatic amino sulfonylation reaction on a cyano thiophene compound and an amino sulfonyl chloride compound; the electrolyte comprises a solvent, a lithium salt, an additive and the thiophene compound. The electrolyte provided by the invention comprises the thiophene compound containing the cyano group and the sulfamide group, and the thiophene compound not only can participate in film formation of a positive electrode and a negative electrode, but also can be complexed with transition metal ions dissolved out from the electrolyte, so that the high-temperature performance of the battery is synergistically improved.

The application discloses a manganese iron lithium phosphate composite positive electrode material with Mn ion self-compensation and multiple interception functions and a preparation method thereof. The manganese iron lithium phosphate composite positive electrode material is composed of a manganese iron lithium phosphate positive electrode material and functional composite film micro-powder loaded on the surface and between the particles of the manganese iron lithium phosphate positive electrode material. The functional composite film of the functional composite film micro-powder is prepared from Na-merolite powder through Mn ion exchange, grafting and copolymerization, lithiumation and PVA composite film preparation. The manganese iron lithium phosphate composite positive electrode material is prepared from the manganese iron lithium phosphate positive electrode material and the functional composite film through mixing, crushing and freeze-drying. The manganese iron lithium phosphate composite positive electrode material realizes the inhibition of the dissolution of Mn 2+ in the manganese iron lithium phosphate positive electrode material from the source, improves the ion conduction performance and the cycle stability of the manganese iron lithium phosphate positive electrode material, and has the advantages of high capacity, long cycle life, high safety and the like.

A cathode material, its preparation method, a cathode sheet, and a secondary battery are disclosed. The cathode material includes a core and a buffer layer. The core contains a first lithium manganese iron phosphate doped with a metal element. The buffer layer covers the outer surface of the core and contains a second lithium manganese iron phosphate. Along the thickness direction of the buffer layer, the iron-manganese ratio near the core is smaller than that far from the core. This cathode material can solve the problem that existing lithium manganese iron phosphate exhibits a dual-voltage plateau characteristic during charge and discharge, affecting the accuracy of charge state estimation.

The invention discloses a modified lithium cobalt oxide material as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a lithium cobalt oxide material and a solvent to obtain a turbid liquid I; s2, mixing the turbid liquid I in the step S1, a coated salt solution and an alkali liquid to obtain a mixed liquid II; wherein the coating salt is selected from at least one of sodium salt, lithium salt, sulfate and titanium salt; s3, drying the mixed solution II in the step S2 to obtain an intermediate material; and S4, heating the intermediate material in the step S3 in an oxygen-containing atmosphere to obtain the modified lithium cobalt oxide material. The specific capacity of the modified lithium cobalt oxide material can reach 213mAh / g or above, the cycle retention rate can reach 90% or above after 50 circles, the 3C / 0.2 C rate capability can reach 85% or above, and through effective coating of the lithium cobalt oxide material, the electrical performance of the modified lithium cobalt oxide material is obviously improved, the specific capacity is improved, and meanwhile the cycle performance and the rate capability are enhanced.

The application discloses a surfactant composition and application thereof, and belongs to the technical field of cosmetics.The surfactant composition provided by the application comprises sodium lauroyl glutamate, decyl glucoside, Tween-28, a betaine surfactant, a glycolipid and mucunna pruriens polysaccharide.The surfactant composition provided by the application can greatly reduce the dissolution of intercellular lipids and natural moisturizing factors and the damage to proteins on the basis of good surface activity, does not affect the skin barrier function, has a regulating effect on the skin microecosystem, balances the skin microecosystem, does not reduce the number of beneficial bacteria in the skin microecosystem, but can help reduce the number of harmful bacteria in the skin microecosystem, thereby effectively improving the skin barrier function and keeping the skin healthy.When applied to subsequent washing and protecting products, the washing and protecting products obtained are excellent in safety.

The invention relates to the technical field of lithium ion batteries, and discloses a high-nickel ternary positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing and sintering a nickel-cobalt-manganese precursor, a lithium source, niobium salt and fused salt. According to the preparation method of the high-nickel ternary positive electrode material provided by the invention, the niobium salt and the molten salt form a liquid phase environment at a relatively low temperature, and the niobium element can efficiently enter a crystal lattice, so that uniform bulk phase doping in a real sense is realized, and the electrochemical stability and the thermal stability are improved; meanwhile, the niobium doping can ensure the rapid and uniform transmission of the lithium source, so that the lithiation is more sufficient, and the lithium-nickel mixed arrangement caused by lithium deficiency is reduced in dynamics.

The invention relates to an electrolyte, an electrochemical device and electronic equipment. The electrolyte comprises an electrolyte additive, the electrolyte additive comprises a halogenated quinoline compound, the electrolyte additive and the positive pole piece meet the following relation: 0.03 < = Ya / (L * M * N) < = 2.8, the mass percent of the electrolyte additive in the electrolyte is Ya%, the total number of the positive active material layers is L, and the sum of the mass percent of the electrolyte additive in the positive active material layers is 100%. The mass of the positive electrode active material layer in unit area on the positive electrode plate is M g / cm < 2 >, and the compaction density of the positive electrode active material layer is N g / cm < 3 >. According to the scheme provided by the invention, the halogenated quinoline compound can be used as the electrolyte additive, and the relationship between the electrolyte additive and the positive electrode active material layer is regulated and controlled, so that the electrolyte can form a stable protective film on the positive electrode and the negative electrode, and the normal-temperature and high-temperature performance of the battery is improved on the premise of ensuring the energy density of the battery.

The invention provides a method for recycling fluorine in a waste battery recycling process, which comprises the following steps: S1, discharging a waste lithium ion battery, crushing, and pyrolyzing the obtained positive plate material to obtain a metal material to be recycled and fluorine-containing flue gas; s2, the fluorine-containing flue gas in the step S1 is sequentially introduced into fluorine-containing sludge and alkali liquor for absorption; s3, after the fluorine-containing sludge in the step S2 is absorbed to be saturated, spraying the alkali liquor which absorbs the fluorine-containing flue gas in the step S2 to the surface layer of the fluorine-containing sludge which is absorbed to be saturated, then carrying out ball milling on the sprayed fluorine-containing sludge, and roasting the obtained ball-milled material to obtain a roasted solid; and S4, the roasted solid in the step S3 is smashed and then leached, leached solid is obtained after solid-liquid separation, and the leached solid is washed and dried to obtain a calcium fluoride product. According to the method, the fluorine-containing sludge and the alkali liquor are used for absorbing the fluorine-containing flue gas, so that recycling of the fluorine element in the recycling process of the waste lithium ion battery is effectively realized.

The utility model discloses an aluminum alloy casting machine adopting a direct-current electromagnetic power mold filling system. The aluminum alloy casting machine comprises a vertical aluminum alloy casting machine, an aluminum alloy holding furnace and the direct-current electromagnetic power mold filling system, the direct-current electromagnetic power mold filling system is mounted on the aluminum alloy holding furnace; the vertical aluminum alloy casting machine is communicated with the aluminum alloy holding furnace through the direct-current electromagnetic power mold filling system; the direct-current electromagnetic power mold filling system comprises a direct-current electromagnetic power mold filling control system, an electrode, a ceramic tube and a riser tube; the ceramic tube is mounted at an outlet of a soup adding chamber of the heat preservation furnace, and the other end of the ceramic tube is communicated with the liquid rising tube; the liquid rising pipe can be located at the position aligned with a molten aluminum inlet in the mold. The direct-current electromagnetic power mold filling system is controlled by a direct-current electromagnetic power mold filling control system to start, the direct-current electromagnetic power mold filling control system is electrically connected with the electrodes, and the electrodes and the ceramic tube are fixed and sealed into a whole.

The invention discloses a tea powder processing method for improving taste and fineness of milk tea, and relates to the technical field of tea product processing. The tea powder processing method comprises the following steps: adding tea leaves into purified water, extracting, and filtering to obtain a tea extracting solution; carrying out enzymolysis on the tea extracting solution by adopting a compound enzyme to obtain enzymatic hydrolysate; the compound enzyme comprises tannase, protease, pectinase and cellulase; cooling and centrifuging the enzymatic hydrolysate to obtain centrifugate; adding rock candy and citric acid into the fruits, pulping, then adding water, uniformly mixing, and filtering to obtain fruit juice; and mixing the centrifugate with the fruit juice, performing ultrahigh pressure treatment, and then performing vacuum freezing and spray drying to obtain the fruit tea powder. The preparation process is simple, the prepared fruit tea powder is sufficient in fragrance, fine and smooth in powder quality, easy to brew and good in taste, and the original color, fragrance, taste, functional and nutritional ingredients of tea leaves and fruits can be well reserved.

The invention discloses a method for simultaneously and quickly pre-treating phthalic acid ester and metabolites thereof in a biological sample, which comprises the following steps: (1) adding diluted hydrochloric acid into the sample according to a ratio of 0.5 g: 3mL, and vortex for 1-3 minutes; (2) adding acetonitrile into the mixed solution obtained in the step (1) according to a ratio of the sample to acetonitrile of 0.5 g: 3mL, carrying out vortex treatment for 1-3min, and then carrying out ultrasonic treatment for 8-15min; (3) adding an extraction salt bag into the mixed solution obtained in the step (2) according to the mass ratio of the sample to the extraction salt bag being 1: 4, violently shaking to enable the salt bag to be fully and uniformly mixed, and then vortex for 5-8 minutes; and finally, centrifuging for 5-6 minutes at the speed of 3000rpm, and taking supernate, so as to obtain a solution for detecting the phthalate and the metabolites thereof.

The invention discloses a method for improving high-voltage stability of a high-nickel ternary positive electrode material, which comprises the following steps: by taking high-nickel NCM811 as a positive electrode material, dispersing the NCM811 positive electrode material in a lactic acid / water mixed solution for stirring treatment, and carrying out H < + > / Li < + > ion exchange reaction on H < + > generated by hydrolysis of lactic acid and Li < + > in a residual lithium compound (Li2CO3 / LiOH) on the surface of the NCM811 to obtain the high-voltage stability of the high-nickel ternary positive electrode material. Meanwhile, a lactic acid layer is constructed on the surface of the material in situ, and then the carbon-coated NCM811 positive electrode material with a low surface residual lithium compound is obtained through high-temperature carbonization, so that the dissolution of transition metal ions in a bulk phase of the NCM811 electrode material is reduced, the crystal structure of the positive electrode is protected from being damaged, the cycle stability of a nickel-rich Li / NCM811 battery at 4.5 V (vs.Li / Li < + >) high voltage is improved, and the service life of the nickel-rich Li / NCM811 battery is prolonged. The method has important application value for regulating and controlling the structure and components of the NCM811 material and improving the electrochemical performance of the NCM811 material.