146 results about "Ion intercalation" patented technology

The invention relates to the field of batteries, in particular to a long-circulation persistent adhesion type negative electrode composite electrode and a preparation method and application thereof. The long-circulation persistent adhesive type negative electrode composite electrode comprises a current collector, and a first adhesive layer, an active slurry coating and a second adhesive layer which are sequentially coated on two sides of the current collector, according to the invention, through the bonding effect between the second bonding layer and the diaphragm, the pole piece is uniformly stressed during cyclic expansion, the wrinkles of the pole piece are improved, the electrolyte infiltration is better in combination with the oil-absorbing conductive agent, the lithium ion transmission efficiency is improved, and the cycle life is prolonged; an interface structure formed by multi-layer coating can buffer lithium ion intercalation / deintercalation stress, so that the pole piece can still keep good binding power after circulation, and the cycle performance of the lithium ion battery can be effectively improved; the conductive agent contents of the first bonding layer, the active slurry coating and the second bonding layer are distributed in a concave gradient manner, so that the resistance is reduced, and the conductivity is enhanced.

The invention belongs to the technical field of batteries, and particularly relates to a waste oil mediated preparation method of a whole-domain low-defect pseudographite domain-rich hard carbon material and a method and high-rate sodium ion energy storage. The preparation method comprises the following steps: uniformly mixing and stirring dried biomass and waste grease, putting the mixture into a tubular furnace, heating under protective gas, carrying out high-temperature carbonization, washing with a diluted hydrochloric acid solution and deionized water in sequence, and drying to obtain the waste oil mediated whole-domain low-defect pseudo-graphite domain high-rate hard carbon negative electrode material. According to the waste oil mediated global low-defect and pseudo-graphite domain-enriched high-rate hard carbon negative electrode material obtained by the invention, the structural stability of the material in an ion intercalation / deintercalation process is enhanced, the cycle life of an electrode is effectively prolonged, the high-rate performance of the material can be considered while the platform capacity is ensured, and the service life of the material is prolonged. And it is ensured that the electrode can still maintain high capacity output and good cycling stability under the large-current charging and discharging condition.

The invention relates to the technical field of sodium-ion batteries, and discloses a super-crosslinked asphalt-based hard carbon material, a preparation method and application thereof, and a sodium-ion battery. Asphalt is subjected to super-crosslinking by adopting a mechanochemical method, and the asphalt, a crosslinking agent and a catalyst realize fracture and recombination of chemical bonds under the action of mechanical shearing force of grinding balls, so that the super-crosslinked asphalt-based hard carbon material is obtained. According to the present invention, the asphalt is subjected to segmented ball milling and super-crosslinking, and then carbonization sintering is performed, such that the asphalt cannot be subjected to molecular rearrangement so as to finally form the hard carbon material with the more suitable microporous structure and the more suitable interlayer spacing, such that the negative electrode ion embedding requirement of the sodium ion battery is met, the excellent sodium storage performance is represented, and the capacity and the first coulombic efficiency of the assembled battery are improved; the performance improvement of the sodium ion battery is integrally promoted. The method is low in energy consumption, short in time consumption, simple in parameter control and suitable for large-scale application and popularization.

The invention discloses a preparation method and application of an antioxidant MXene-based flowing electrode material capable of realizing efficient capacitance defluorination, and belongs to the technical field of water treatment. The preparation method comprises the following steps: sequentially carrying out nitrogen doping and cysteine modification on MXene to obtain the antioxidant MXene-based flowing electrode material capable of realizing efficient capacitance defluorination. The MXene is prepared by a Lewis acid fused salt etching method. According to the method disclosed by the invention, the electrochemical performance of the MXene electrode is effectively improved, the conductivity of the MXene electrode is enhanced, the protection of terminal groups is realized through cysteine modification, and the oxidation resistance of the MXene electrode is improved. The anti-oxidation MXene-based flowing electrode material prepared by the invention has high specific surface area, large pore volume and multiple adsorption sites, and can realize specific efficient adsorption of fluorine ions through ion intercalation and special functional groups at end positions.

The invention discloses a high-performance sodium ion battery negative electrode ZnS / CoS (at) C composite material and a preparation method thereof, the material preparation method has the characteristics of definite control parameter, easy purity control, simple operation, good process repeatability and the like, and the prepared sodium ion secondary battery negative electrode material has excellent sodium ion intercalation and deintercalation capability and can be used for preparing a sodium ion secondary battery negative electrode material. The specific capacity, the cycling stability, the coulombic efficiency and the rate capability of the sodium ion secondary battery can be effectively improved, the requirements of different conditions can be met, and the application prospect is wide.

A rechargeable battery is disclosed. The rechargeable battery comprises an anode, a cathode comprising a lithium-ion intercalation host, and an electrolyte comprising a solvent and a halogen-containing compound acting as an active cathode conversion material, wherein the electrolyte is in contact with the anode and the cathode.

The invention discloses a preparation method and application of an organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material, and the method comprises the following steps: S1, adding 2, 5-hexanedione, aluminum chloride and a vanadium-based oxide into deionized water according to a preset molar ratio, and stirring to a uniform state; s2, continuously stirring the solution prepared in the step S1, controlling the stirring rate, and dropwise adding diluted hydrochloric acid to adjust the pH value to a target pH value; and S3, washing and drying the material prepared in the step S2 to obtain the organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material. The vanadium-based oxide positive electrode material is optimized by applying an organic molecule metal ion double-intercalation strategy, the skeleton is greatly stabilized, the bonding mode of the vanadium-based oxide is optimized, more Zn < 2 + > ion intercalation active sites are provided, and the electrochemical performance of the material is improved. The prepared organic molecule metal ion double-intercalation vanadium-based oxide positive electrode material shows excellent cycling stability, relatively high specific capacity and excellent rate capability.

The invention relates to an efficient and stable electrode material and a preparation method thereof.The preparation method comprises the steps that a nickel net substrate is pretreated, then an electroplating solution containing a nickel source and a pore forming agent is prepared, a layered nickel hydroxide layer is generated on the substrate through electro-deposition, then ions enter the nickel hydroxide layer through a soaking embedding method or an electrochemical embedding method, and the electrode material is obtained. And finally, sintering in a nitrogen atmosphere, controlling the sintering temperature, the sintering time and the heating and cooling rate, and performing cooling after-treatment to obtain the electrode material. Compared with the prior art, the catalytic performance and the stability of the electrode are optimized through the steps of ion embedding and sintering. The method is suitable for preparing an electrode for efficient water electrolysis reaction, a porous structure promotes rapid emission of gas and increases the active surface area, and ions embedded in the surface are used for forming a shell with high catalytic activity.

The invention provides metal ion intercalation vanadium dioxide as well as a preparation method and application thereof, belongs to the technical field of aqueous iron ion batteries, and aims to solve the technical problem of low energy density of an aqueous iron ion battery positive electrode material. The preparation method of the metal ion intercalation vanadium dioxide comprises the following steps: dispersing vanadium pentoxide, a reducing agent and a metal source into a solvent to obtain a mixed solution; and reacting the mixed solution to obtain the metal ion intercalation vanadium dioxide nanosheet. The synthesis method provided by the invention is a one-step hydrothermal method, the synthesis method is relatively simple, environment-friendly and relatively low in cost, and the prepared material is a relatively uniform nanosheet. The prepared metal ion intercalation vanadium dioxide nanosheet is used as a positive electrode material of an iron ion battery, 284.32 mAh g <-1 > can be provided under the current density of 0.1 A g <-1 >, and the average discharge efficiency is as high as 99%.

The invention relates to the field of graphene sensors, and particularly discloses a preparation method of a sweat-erosion-resistant laser-induced graphene sensor, which comprises the following steps: firstly, locally heating laser-induced graphene coated with heat release glue by using 1064 nm laser, so that the laser-induced graphene is stripped from an original polyimide substrate and transferred to a target thermoplastic polyurethane flexible substrate; then using 355 nm laser to ionize mixed gas of inert gas and oxygen, generating plasma to bombard an interface of laser-induced graphene and polyurethane, and inducing covalent bonding between surface functional groups; and then spraying a polydimethylsiloxane-urea / silicon dioxide fluoride composite solution on the surface of the laser-induced graphene-polyurethane composite structure subjected to transfer printing and bonding, and sintering by adopting 532 nm laser to form the self-repairing super-hydrophobic packaging layer with a micro-nano mastoid structure. The problem of ion intercalation in sweat is solved, and the electrical stability, the interface bonding strength and the wear resistance of the sensor are remarkably improved.

The invention discloses a multi-cavity mesoporous carbon nanosphere battery material and a preparation method and application thereof, and belongs to the technical field of ion batteries, the method comprises the following steps: mixing a cosolvent and a surfactant, and stirring until the cosolvent and the surfactant are dissolved; adding a carbon source monomer, and stirring until dissolving; adding a pore-foaming agent, and stirring to form a suspension; and finally, adding a hydrogen bond catalyst, and after the stirring reaction is finished, washing, freeze-drying and carbonizing to obtain the multi-cavity mesoporous carbon nanosphere battery material. The problems of poor micelle stability and low repeatability of a traditional soft template method are solved through cooperative regulation and control of catalysis of the hydrogen bond catalyst and precise assembly time. By simply controlling the reaction time, a product with the multi-cavity structure reaching 65.3%-92.5% is stably and repeatedly prepared and far exceeds 31.7% of that of a non-catalytic system, and precise customization of the microstructure of the material is achieved. The multi-cavity structure can better buffer the volume change caused by sodium ion intercalation / deintercalation in the charging and discharging process, and is beneficial to maintaining the structural integrity of the electrode material.

The invention discloses a preparation method of an ammonium ion intercalation hydrated layered vanadium oxide and application of the ammonium ion intercalation hydrated layered vanadium oxide in a rechargeable zinc ion battery, the chemical composition of the hydrated layered vanadium oxide is (NH4) 0.4 V2O5.nH2O, and n is 0.01-2. The preparation method comprises the following steps: firstly, dispersing pentavalent vanadium source compounds (vanadium pentoxide and ammonium metavanadate) and ammonium radical-containing inorganic matters (ammonia water, (NH4) 2SO4, NH4NO3 and NH4Cl) into a mixed solution of water and an organic solvent; adjusting the pH value of the mixed solution to 1-5 by using a proper amount of acid solution (hydrochloric acid, sulfuric acid and nitric acid) to obtain a precursor solution; reacting the precursor solution at 90 to 200 DEG C for 5 to 20 hours, wherein the preferable reaction temperature is 120 to 140 DEG C; the preferable reaction time is 5 to 10 hours; and centrifuging or filtering, washing and drying to obtain the vanadium-based oxide. The preparation method is mild in reaction condition and simple in process; the obtained ammonium ion intercalation hydrated layered vanadium oxide is used as a positive electrode material to be applied to a zinc ion battery for the first time, and shows excellent cycling stability.

A Na2Ti7O15 doped Na2Ti3O7 sodium titanate electrode material, and a preparation method therefor and a use thereof. The electrode material has a porous block structure formed by stacking nanorods. The electrode material is synthesized by a simple solid-phase method, and is obtained by carrying out ball milling on precursors sodium carbonate and anatase-phase titanium dioxide in proportion, and then carrying out microwave sintering in air; the addition of Na2Ti7O15 increases the exposure of (100) sodium storage crystal face and decreases the exposure of (003) crystal face of Na2Ti3O7 sodium titanate; and Na2Ti7O15 has four TiO6 octahedrons in one structural unit, and has more sodium storage sites and wider sodium-ion diffusion channels, thereby improving the specific capacity and rate performance of the material. Upper and lower layers of TiO6 octahedrons in Na2Ti7O15 are connected to each other, such that the structure is more stable in a sodium-ion intercalation / deintercalation process, thereby improving the long cycle stability of the material.

The invention discloses a preparation method of transition metal ion modified bimetallic MXene, which comprises the following steps: preparing different metal ions (Co < 2 + >, Ni < 2 + > and Mn < 2 + >) and Mo2TiC2Tx materials (marked as Mo2TiC2Tx-M) with different intercalation concentrations through electrostatic interaction, and carrying out detailed characterization and analysis on the Mo2TiC2Tx materials to explore the feasibility of MXene material modification. By analyzing the phase and morphology of the prepared sample, the transition metal ion intercalation enables the structure of Mo2TiC2Tx to become looser, and meanwhile, the interlayer spacing of Mo2TiC2Tx is remarkably increased. By introducing metal ions, a new metal bond can be formed, and electrons can be efficiently transferred. The research on the electrochemical performance of the material finds that the bimetallic MXene of the metal ion intercalation has excellent electro-catalytic hydrogen evolution performance and good stability.

The present invention relates to a thermoelectric and hygroelectric power generation material based on a metal-phase molybdenum disulfide double-layer conductive fabric, a preparation method and an application thereof. Using metal-phase molybdenum disulfide as the base material, an ammonium ion intercalation hydrothermal method is used to in-situ grow a vertical array of 1T-phase molybdenum disulfide nanosheets on the surface of carbonized silk fibers to construct a p-type semiconductor, which provides abundant nano-channels for the efficient moisture absorption and flow of water, generating a high current density output; using a cotton fabric as the substrate, an n-type semiconductor is constructed by forming a 1T-phase molybdenum disulfide / titanium carbide van der Waals heterostructure on the surface of cotton fibers. The large specific surface area of the 1T-phase molybdenum disulfide / titanium carbide van der Waals heterostructure enables rapid electron migration. The present invention constructs a textile-based thermoelectric and hygroelectric generator through the orderly encapsulation of p-type 1T-phase molybdenum disulfide / carbonized silk, n-type 1T-phase molybdenum disulfide / titanium carbide-cotton fabric and aluminum electrodes, realizing the efficient collection and conversion of low-grade thermal energy and moisture energy, and can be applied to intelligent wearables, flexible sensing and energy conversion.

The present invention belongs to the technical field of lithium batteries, and particularly relates to a high-rate lithium / carbon monofluoride primary battery electrolyte and its application. By using sodium salts and / or potassium salts, the present invention changes the discharge mechanism of Li / CF x batteries, playing a dual role in the ion intercalation reaction mechanism and the nucleation and growth of discharge products. Compared with solvated Li + , the desolvation energy of solvated Na + with the same structure is about 30% lower, which transforms the original desolvation and intercalation mechanism involving lithium salts throughout the process into an early reaction between sodium ions and fluoride ions, reducing the reaction energy barrier of the early electrochemical reaction. At the same time, in various solvents, the Stokes radius of K + is smaller than that of Li + , which means that the diffusion rate of K + is faster, which can not only reduce polarization but also increase the ion intercalation rate, achieving good rate performance. Finally, the present invention realizes an increase in the discharge specific capacity and specific power of the battery, without sacrificing the specific capacity and specific power due to the increase in the mass of non-active substances.

The utility model relates to a laminated core structure which comprises at least two negative pole pieces, at least one positive pole piece and at least one composite pole piece, the at least two negative pole pieces are sequentially arranged along the first direction; one positive pole piece is arranged between every two adjacent negative pole pieces, or one composite pole piece is arranged between every two adjacent negative pole pieces; the composite pole piece comprises a lithium piece and a polymer, and the high polymer coats the lithium sheet. In the laminated core structure, the lithium sheets can supplement lithium ions consumed by forming a solid electrolyte interface (SEI) film in the formation stage of the battery, so that the loss of active lithium is reduced, the initial coulombic efficiency of the battery is further improved, and the overall performance of the battery is enhanced; meanwhile, the polymer sheet also has a good elastic characteristic and can adapt to volume change caused by lithium ion intercalation and deintercalation in the charging and discharging process of the battery, so that the pressure on the shell is reduced, the deformation of the shell is effectively prevented, and the safety of the battery is improved.

According to the polyquinone diazacyclo organic positive electrode material and the preparation method thereof, the organic positive electrode material can be applied to lithium ion, sodium ion, potassium ion and multivalent ion batteries, the synthesis method is simple, and large-scale preparation can be realized. According to the organic positive electrode material, quinone is used as a redox unit, a dinitrogen heterocyclic ring is used as a connecting structure, the prepared polymer has proper flexibility, a proper space is provided for intercalation / deintercalation, and good cycle performance is shown in a multivalent ion battery. According to the preparation method, 2, 5-halogenated-1, 4-benzoquinone derivatives and diazacyclo derivatives are used as reaction raw materials to carry out condensation reaction. Experiments prove that by taking the poly (2, 3, 5, 6-tetrachloro-1, 4-benzoquinone-imidazoline) positive electrode material as an example, in the application of the zinc ion battery, the capacity retention ratio is 82% after 250 cycles under the current density of 0.1 A g <-1 >.

This application relates to a negative electrode material, and to a negative electrode, electrochemical apparatus, and electronic apparatus using the material. Specifically, this application provides a negative electrode material comprising graphite, wherein the I-stage lithium insertion platform potential P1 of the negative electrode material is 30mV to 75mV, and the II-stage lithium insertion platform potential P2 is 90mV to 110mV. By adopting the negative electrode material of this application, the cycle performance of electrochemical apparatus using it under high voltage and high temperature conditions can be significantly improved, the Coulomb capacity of the negative electrode material can be increased, and the initial efficiency of the negative electrode material can be achieved simultaneously.

The invention relates to the technical field of preparation of inorganic nano materials, and discloses a preparation method of a single-layer 1T-phase transition metal chalcogenide quantum sheet material, which mainly comprises the following steps: preparing a transition metal chalcogenide nano powder material by adopting a common hydrothermal or solvothermal method; the preparation method comprises the following steps: preparing a suspension of 1T-phase chalcogenide by a method of combining ion intercalation with liquid phase stripping; and carrying out centrifugal purification on the dispersion liquid obtained by stripping to obtain a suspension of the single-layer 1T-phase chalcogenide quantum sheet material, and further, carrying out cleaning, drying and other steps to obtain the single-layer 1T-phase chalcogenide quantum sheet powder material. The process is simple, the cost is low, the single-layer 1T-phase chalcogenide quantum sheet material can be efficiently prepared, the specific surface area of the product is high, the electrochemical activity is high, and a two-dimensional quantum sheet material with the characteristics of high activity, high specific surface area and the like can be provided for application of various energy storage and energy conversion devices such as supercapacitors, ion batteries, catalysis and the like.

The invention relates to a method for producing partially reacted silicon for the control of the lithium intercalation capacity, for use in lithium batteries, wherein a first silicon layer is deposited on a substrate, the first silicon layer subsequently being subjected to rapid thermal processing. The invention also relates to an anode thereby produced. The problem addressed by the present invention of specifying a method that allows control of the capacity of ion intercalation into functional layers for battery production is solved in that a layer of silicon, metal and / or another material is applied as a diffusion barrier, which is subjected to subsequent rapid thermal processing, and partially reacted silicon is formed. (The structure of the diffusion barrier makes the diffusion barrier permeable to lithium.)

A battery and an electric apparatus. The battery comprises a positive electrode sheet and a negative electrode sheet, wherein the positive electrode sheet comprises a positive electrode active material layer, the positive electrode active material layer comprising a positive electrode active material and a lithium-supplementing agent, and the content of nickel in 1 mol of the positive electrode active material being 0.8 mol to 1 mol; and the negative electrode sheet comprises a negative electrode active material layer, the negative electrode active material layer comprising a negative electrode active material, and the negative electrode active material comprising a silicon-based material. The present application can improve the capacity of the battery and reduce the resistance to the intercalation of active metal ions during charging, thereby improving the energy density and fast-charging performance of the battery.

The present disclosure relates to the technical field of salt lake lithium extraction and recovery, and in particular to a method for extracting lithium from a salt lake by using a flow electrode, and a device for extracting lithium from a salt lake. By using a flow electrode slurry mixed with a lithium intercalation / deintercalation active material as a lithium ion electric deintercalation carrier, using a flow electrode slurry mixed with a calcium intercalation / deintercalation active material as a calcium ion electric deintercalation carrier, and incorporating an electrochemical principle, salt lake lithium extraction is carried out, and in the process of lithium intercalation, Ca2+ and Mg2+ generate a competitive effect when entering a flow electrode, so that magnesium ions do not easily enter a lithium-intercalated slurry by means of an ion exchange membrane, thereby inhibiting the intercalation of the magnesium ions into the lithium intercalation / deintercalation active material; and in a lithium intercalation / deintercalation system, the electrode potential of calcium ions is significantly different from that of lithium ions, so that the calcium ions cannot be intercalated into the lithium intercalation / deintercalation active material. Therefore, the method provided by the present disclosure can effectively separate lithium and magnesium, thereby improving the purity of recovered lithium.

This application discloses a method and apparatus for electrochemical extraction to obtain low-impurity lithium ions, relating to the field of capacitive deionization technology. The apparatus includes a positive current collector and a negative current collector with a working surface coated with mesoporous activated carbon material and a chemically de-intercalated lithium ion sieve. A lithium-ion-containing solution circulates between the working surfaces of the positive and negative current collectors. A voltage is applied to insert lithium ions into the chemically de-intercalated lithium ion sieve. After the power is turned off, the cations adsorbed by the mesoporous activated carbon material are re-desorbed. The resulting lithium-ion-intercalated sieve electrode is placed in an electrolyte solution and a voltage is applied to remove lithium. This application uses mesoporous activated carbon material as the negative electrode to adsorb impurity cations in the salt solution. The impurity cations are enriched on the surface of the activated carbon and do not accumulate on the surface of the ion sieve, hindering the absorption of lithium. + By placing the lithium ion extraction device closer to the chemical deintercalation sieve, the content of impurity cations intercalating into the sieve lattice can be reduced, thereby improving the lithium extraction efficiency and purity of the sieve.

The invention relates to a nanocrystalline O3 phase layered sodium ion battery positive electrode material, which comprises single crystal particle NaaNibFecMnd, 0.8 < = a < = 1.05, 0 < = b < = 0.33, 0 < = c < = 0.4, 0 < = d < = 0.4, b + c + d = 1, and a, b and c are not 0 at the same time. No grain boundary exists in the nanometer single crystal O3 phase layered sodium ion battery positive electrode material, and the problem of grain boundary cracking caused by anisotropic lattice change in the charging and discharging process of a similar polycrystalline material is solved. The nano single crystal O3 phase layered sodium ion battery positive electrode material provided by the invention has the characteristics of high specific surface area and high reaction activity, and can realize higher sodium ion intercalation and deintercalation quantity, thereby improving the specific capacity of the battery. Moreover, the nano single crystal O3 phase layered sodium ion battery positive electrode material can shorten the diffusion path of sodium ions and reduce the ion diffusion resistance, so that the material has good rate capability.

This invention discloses a superlattice structure all-solid-state thin-film battery cathode material, its preparation method, and its applications. The cathode material consists of a substrate and a stacked structure deposited on the substrate surface. The stacked structure is formed by alternating deposition of a first transition metal oxide layer and a second transition metal oxide layer from bottom to top. The first and second transition metal oxides of this invention have different work functions and lithium-ion intercalation potentials. An integrated electric field is induced through interface bandgap engineering, synergistically enhancing electron / ion transport dynamics. Simultaneously, lattice pinning and lattice pre-strain are used to suppress structural degradation during cycling. The cathode material provided by this invention exhibits high specific capacity, excellent rate performance, long cycle life, and low preparation temperature, is compatible with semiconductor processes, and is suitable for microelectronic integrated systems.

The application discloses a preparation method of a zinc-doped core-shell NiCo2O4 / NiCo-LDH three-dimensional heterostructure electrode material and application thereof. The preparation method of the electrode material is as follows: carbon paper is used as a substrate, NiCo2O4 nanowires are used as a core, zinc-doped NiCo-LDH nanosheets are used as a shell, a three-dimensional hierarchical core-shell structure is constructed, and a two-step hydrothermal method is adopted. The preparation method is simple in process, controllable in cost, and easy for large-scale production. The electrode material is applied to a sodium ion battery. Through zinc doping, oxygen vacancies are induced to be generated, an electronic structure is optimized, and a sodium ion embedding / extraction dynamic process is significantly accelerated. Excellent results are achieved in the application of the sodium ion battery, and a new strategy is provided for design and development of a high-performance sodium ion battery transition metal-based electrode material.

The invention discloses preparation of a single-layer NIPS3 two-dimensional crystal material and application of surface enhanced Raman spectroscopy. According to the method, an ion intercalation liquid-phase stripping method is adopted, ammonium salt is added into a propylene carbonate solution to serve as an intercalator, an NIPS3 single crystal serves as a cathode, a metal platinum wire serves as a counter electrode and a reference electrode, and an electrifying reaction is carried out. And diluting the stripped dispersion liquid into a solution medium, removing agglomerated nanosheets, spin-coating the surface of a substrate with the NIPS3 solution medium dispersion liquid, and drying to obtain the surface-enhanced Raman scattering substrate. The method has the advantages of being simple and easy to implement and convenient to operate. And the prepared NIPS3 has controllable morphological characteristics and stable SERS performance, and is an ideal SERS substrate material. The rapid trace detection on the organic molecules is realized.

The invention discloses a preparation method and application of a heterostructure manganese-based positive electrode material, and the preparation method comprises the following steps: dissolving potassium permanganate and manganese sulfate monohydrate in deionized water, transferring into a reaction kettle after the potassium permanganate and the manganese sulfate monohydrate are completely dissolved, putting into a drying oven, and carrying out hydrothermal synthesis at certain time and temperature to obtain a precursor MnOOH material; after the reaction is completed, taking out the hydrothermal kettle after the hydrothermal kettle is cooled, carrying out centrifugal cleaning on a product for multiple times, then putting the product into a drying oven to be dried to obtain a precursor MnOOH material, then transferring the precursor material into a porcelain boat, putting the porcelain boat into a tubular furnace, and annealing at a certain temperature for a certain time to obtain the heterostructure manganese dioxide. Manganese dioxide prepared by the method is of alpha-type and beta-type manganese dioxide heterostructures (alpha / beta-MnO2) and is different from traditional single crystal type manganese dioxide, and the sample has more and more stable tunnel structures. According to the invention, the problems of low specific capacity and poor cycling stability caused by a small number of single crystal type beta-MnO2 ion intercalation and deintercalation channels and poor intercalation and deintercalation reversibility of alpha-MnO2 are solved.

The invention relates to the technical field of supercapacitor negative electrode materials, and discloses a preparation method and application of a high-capacity and high-magnification MXene electrode capable of rapidly eliminating active Ti-OH sites in a targeted manner. The preparation method comprises the following steps: adding an acid solution and a salt solution into a single / few-layer Ti3C2MXene aqueous dispersion, and heating and stirring in an air atmosphere to obtain a reaction mixed solution; carrying out centrifugal washing on the reaction mixed solution by using deionized water until the supernate is neutral; and collecting centrifugal precipitate, adding deionized water for ultrasonic dispersion to obtain an MXene aqueous dispersion liquid with active Ti-OH sites eliminated, and preparing a high-capacity and high-magnification MXene electrode by using the MXene aqueous dispersion liquid. According to the method, the single / few-layer Ti3C2MXene aqueous dispersion is stirred through air contact and moderate heating, and the ionic intercalation of the salt solution and the hydrolysis inhibition of the acid solution are matched, so that the high-activity Ti-OH sites are fully oxidized, hydrolyzed and removed, and the mass specific capacity, the rate capability and the cycle performance of MXene are improved.