79 results about "Pseudocapacitance" patented technology

The invention discloses a preparation method and application of three-dimensional intercalation multidirectional conductive MXene-based aerogel, and relates to the technical field of advanced electrochemical energy storage materials and devices. According to the MXene / conductive polymer and nanofiber composite aerogel developed by the invention, the two-dimensional conductive material, the pseudocapacitance polymer and the high-performance nanofiber are integrated in a three-in-one manner, so that collaborative optimization of conductivity, the number of active sites and structural stability is realized, and inherent defects of a single-component material are fundamentally avoided; and a universal solution is provided for solving the industrial problem of unbalanced performance of the electrode material.

The invention provides a design and application of a power type electrolyte of a double-electric-layer capacitor, and the electrolyte comprises an organic solvent, an electrolyte salt and an additive. Wherein the additive has a general formula structure as shown in Figure 1: the additive has a strong electronegativity part and a strong electropositivity part, a proper chain length is adjusted between the two parts, so that the whole molecular size of the additive can be matched with the micropore diameter of the activated carbon, adsorption and desorption are facilitated, bond breaking is easy, and when part of pseudocapacitance is contributed through oxidation bond breaking, the performance of the additive is improved. According to the present invention, the positive electrode and the negative electrode can be preferentially adsorbed to the positive electrode and the negative electrode so as to form the regulation and the low polarity and high density interface, such that the ion association of the salt ions at the double electrode layer is reduced, the reduction of the liquid phase transmission internal resistance is achieved, the excellent power performance is further represented, and the capacity retention rate in the 125A large-rate cycle (the conventional current is 25A) is increased to 90.1% from 76.3%. In addition, the silicon-containing part formed by broken bonds can also synergistically remove HF generated by hydrolysis of salt anions BF4 <-> in the electrolyte, passivate Al foil and reduce the contact internal resistance of the aluminum conducting bar. The configuration of the additive introduced into the electrolyte is shown in the specification.

The invention relates to a graphite phase carbon nitride doped bismuth oxide composite electrode material and a preparation method and application thereof, and belongs to the technical field of capacitive deionization desalination. The preparation method of the graphite phase carbon nitride doped bismuth oxide composite electrode material comprises the following steps: uniformly mixing g-C3N4 and Bi2O3, and calcining to obtain the graphite phase carbon nitride doped bismuth oxide composite electrode material. The graphite-phase carbon nitride doped bismuth oxide composite electrode material provided by the invention has abundant sites and attachment points, provides additional pseudocapacitance, and is beneficial to improving the electron transmission efficiency and the electro-adsorption capacity; the preparation method provided by the invention is simple, convenient and relatively low in cost; under a certain voltage and flow velocity, the g-C3N4atBi2O3 composite electrode material adsorbs chloride ions for a Faraday capacitor, and the activated carbon adsorbs sodium ions for a double-electrode-layer capacitor, so that the effect of removing sodium chloride is achieved.

The invention provides an electro-adsorption desalting device and method based on the synergistic effect of double electric layers and a pseudocapacitor, the device comprises a shell, a cathode plate, an anode plate and a stabilized voltage direct current power supply, and the shell is provided with a water inlet and a water outlet; the cathode plates and the anode plates are detachably connected to the interior of the shell, the multiple cathode plates and the multiple anode plates are arranged in a staggered mode, the surfaces of the anode plates are coated with anode adsorption materials, the anode adsorption materials are formed by compounding carbon-series materials and pseudocapacitance materials with anion storage capacity, the surfaces of the cathode plates are coated with cathode adsorption materials, and the cathode adsorption materials are formed by compounding carbon-series materials and pseudocapacitance materials with anion storage capacity. The cathode adsorption material is formed by compounding a carbon-series material and a pseudocapacitance material with cation storage capacity; and the voltage-stabilized direct-current power supply is electrically connected with the cathode plate and the anode plate respectively. The desalting efficiency and the adsorption capacity of the water sample to be treated can be improved, the operation is simple, and the practicability is relatively high.

The invention discloses a current collector active material and a preparation method and application thereof, and relates to the technical field of electrochemical energy storage. Comprising the following steps: dissolving acid, a niobium precursor and aniline in water to form a solution A; dissolving ammonium persulfate in water to form a solution B, adding the solution B into the solution A, uniformly mixing, standing for reaction, carrying out suction filtration and drying to obtain niobium-doped polyaniline carbon nanotubes, and carrying out heat treatment on the niobium-doped polyaniline carbon nanotubes in a protective atmosphere to obtain amorphous carbon nanotubes embedded with niobium pentoxide nanoparticles. The method can be used for preparing a negative-electrode-free sodium metal battery current collector and a negative-electrode-free sodium metal battery. According to the method, hectogram or even kilogram-level superfine amorphous carbon nanotubes embedded with niobium pentoxide nanoparticles can be prepared in a single batch in a macroscopic manner, and Nb2O5 nanoparticles anchored in the carbon tubes are subjected to reversible intercalation pseudocapacitance reaction, so that the sodium ion migration rate is remarkably increased, sodium ions are preferentially adsorbed, the nucleation overpotential is greatly reduced, and the performance of the carbon nanotubes is improved. And the assembled negative-electrode-free sodium metal total battery shows an extremely high capacity retention ratio.

MAX-phase Mo2Ga2C is used as a matrix, a liquid phase corrosion method is utilized, the preparation of the two-dimensional vacancy doped molybdenum carbide (Mo2-CTz) nano material is realized through excessive corrosion, and the two-dimensional vacancy doped molybdenum carbide (Mo2-CTz) nano material is applied to the aspect of a hybrid supercapacitor. Compared with other reported MXene materials, the influence of vacancy doping measures on the Mo2CTz nanometer material is studied, the layered MAX ceramic powder is excessively corroded through hydrofluoric acid, vacancies are introduced into a metal layer, vacancy doping of MXene is achieved, and the capacitive performance of the MXene is improved. And vacancy defects are introduced, so that the interlayer spacing of MXene can be increased, activation sites on the surface of the layered structure can be increased, the conductivity of the two-dimensional material can be improved, the utilization rate of pseudocapacitance active sites of the two-dimensional material can be improved, and finally the capacitive performance of the Mo < 2->-CTz-based electrode can be enhanced. The successful development of the two-dimensional vacancy doped Mo < 2->-CTz self-supporting film electrode material lays a foundation for the practical application of electrochemical energy storage devices such as hybrid supercapacitors and ion batteries.

The preparation method comprises the following steps: mixing cobalt acetate, a modified ligand, a modified additive and DMF (Dimethyl Formamide), carrying out ultrasonic treatment, adding deionized water and a modified filler, carrying out ultrasonic treatment, carrying out heating reaction, carrying out centrifugation to remove a supernatant, and carrying out drying treatment to prepare the rapid-charge high-capacity artificial graphite negative electrode material, when the cobalt acetate, the modified ligand, the modified additive and the modified filler are subjected to blending reaction, carboxyl on the modified ligand and carboxyl on the modified additive can form coordinate bonds with cobalt ions of the cobalt acetate, then a cobalt metal organic framework is formed on the surface of the modified filler, and a fluorine element in the modified ligand can react with lithium to form lithium fluoride; electron penetration is effectively blocked, and side reactions are reduced; the lithium ion diffusion energy barrier is reduced, rapid charging and discharging are achieved, pyridine groups on the surface of the modified filler can provide lone pair electrons and serve as binding sites of lithium ions, pseudocapacitance is formed, and then the capacity is increased.

The invention provides a high-entropy oxide material and a preparation method and application thereof, and relates to the technical field of supercapacitor materials. The high-entropy oxide material is prepared by taking nitrates corresponding to Cr, Fe, Co and Ni and ammonium paramolybdate as raw materials through a simple solution synthesis method, is of a spinel structure and has a space group of Fd-3m. According to the preparation method provided by the invention, the specific surface area of the material can be increased by utilizing the high-entropy effect of various metal elements by regulating and controlling the proportion and synthesis conditions of all the metal elements, and the prepared high-entropy oxide can still keep the structural stability and electrochemical activity under high temperature or extreme electrochemical conditions, is not easy to generate phase separation or degradation, and has a good application prospect. Therefore, the durability and the service life of the material are remarkably improved. The high-entropy oxide material prepared by the method shows excellent pseudocapacitance behavior in electrochemical energy storage, and provides an efficient and economical material choice for energy storage.

The invention belongs to the field of nano materials, and relates to a graded core-shell structure nickel-cobalt metal hydroxide nanosheet coated nitrogen-doped carbon nanofiber membrane and a preparation method and application thereof.The nitrogen-doped carbon nanofiber membrane is adopted as a conductive substrate, a graded core-shell structure nickel-cobalt metal hydroxide nanosheet array grows on the surface of the nitrogen-doped carbon nanofiber membrane, and the graded core-shell structure nickel-cobalt metal hydroxide nanosheet array is prepared. The core-shell structure refers to that a nanosheet is loaded on a nanosheet. The preparation method comprises the following steps: dissolving polyacrylonitrile and 2-methylimidazole in an N, N-dimethylformamide solution, carrying out electrostatic spinning to obtain a precursor nanofiber membrane, carrying out pre-oxidation and high-temperature carbonization to obtain a nitrogen-doped carbon nanofiber membrane, and then carrying out two-step hydrothermal reaction to obtain the nitrogen-doped carbon nanofiber membrane. The nitrogen-doped carbon nanofiber membrane material coated with the nickel-cobalt metal hydroxide nanosheet with the graded core-shell structure is obtained. The composite material prepared by the invention combines the high conductivity of the nitrogen-doped carbon nanofibers, the pseudocapacitance characteristic of the nickel-cobalt metal hydroxides and the advantages of the graded core-shell structure, and has excellent supercapacitor performance.

The invention discloses a device for performing direction control and separation on charged particles in electrolyte, which comprises a microfluid channel, the microfluid channel is provided with a sample inlet port and a sample outlet port, a fluid flows from the sample inlet port to the sample outlet port at a speed v0, a separation chamber is formed in the microfluid channel, the fluid contains the charged particles, and the separation chamber is communicated with the sample inlet port and the sample outlet port. Charged particles are separated in the separation chamber; the number of the electrodes in each group of electrodes is the same or different, each electrode is in contact with the fluid, a pseudocapacitor and / or a double-layer capacitor are / is formed on the contact interface of the electrode and the fluid, the electrodes are arranged in the microfluid channel in parallel, and a certain angle can be formed between the arrangement direction and the flowing direction of the fluid; a plurality of conductor leads; and each driving power supply is connected with one group of electrodes, the driving power supplies generate periodic voltage or current excitation, and the voltage excitation or the current excitation output by the driving power supplies in an output period is in a changing state.

The invention belongs to the field of organic wastewater resourceful treatment, and particularly relates to a humic acid'energy battery '-based wastewater biological treatment method and a humic acid'energy battery'-based wastewater biological treatment device. According to the invention, humic acid and a magnetic material are coupled to prepare a recyclable magnetic humic acid composite material; a wastewater resourceful treatment method is developed on the basis of the material and comprises the following cycle steps of a charging link, a degradation treatment link and a magnetic adsorption link. A treatment device is further developed on the basis of the characteristic, and intermittent charging and recycling of the magnetic humic acid composite material are achieved on the basis of the device. Charges are obtained from an electrode by utilizing the pseudocapacitance effect of natural organic matter humic acid, and are used as an energy battery to directly charge a microbial electron transfer path, so that the limitation of traditional interspecific electron transfer of microorganisms is broken through, and the problem of low microbial electron transfer efficiency in the biotransformation process of organic matters can be fundamentally solved; and the method has creative significance.

The invention discloses a preparation method of a nitrogen-doped graphene carbon nanotube high-power composite electrode material. The material is prepared by taking graphene oxide and carboxylated multi-walled carbon nanotubes as precursors and urea as a nitrogen source through synergism of chemical reduction and a hydrothermal method. A three-dimensional porous network structure is constructed through solvent dispersion, ultrasonic compounding, high-temperature reduction and hydrothermal doping processes, and the nitrogen-doped graphene carbon nanotube composite hydrogel is obtained. The electronic structure of the carbon material is regulated and controlled through nitrogen atom doping, active sites such as pyridine nitrogen, pyrrole nitrogen and graphite nitrogen are introduced, and the surface wettability and the pseudocapacitance performance are improved. The prepared NGM5 electrode has a high specific surface area (197.91 m < 2 > / g) and a multilevel mesoporous structure. 37.0 wt% H2SO4 is used as an electrolyte to assemble a symmetric supercapacitor, the surface capacity of 498 mF cm <-2 > and the energy density of 69.03 mu Wh cm <-2 > are realized at room temperature of 1 mA cm <-2 >, the energy density of 57.51 mu Wh cm <-2 > is still kept at the extreme low temperature of-60 DEG C, and the capacitance retention rate exceeds 70% after 8000 times of charge and discharge cycles. The preparation process is simple, the cost is low, graphene stacking and carbon nanotube agglomeration are effectively inhibited, the problem of low-temperature performance degradation of a traditional carbon-based material is solved, and the method is suitable for industrial production of a high-power and wide-temperature-range supercapacitor electrode material.

The invention discloses a preparation method of nickel-iron-based oxide / sulfide based on laterite-nickel ore and application of the nickel-iron-based oxide / sulfide in the field of supercapacitors, and belongs to the field of pseudocapacitor electrode material preparation and supercapacitors, and the nickel-iron-based oxide / sulfide is prepared by taking the laterite-nickel ore as a metal source and adopting an acid leaching-chemical deposition-calcination method. The nickel-iron-based oxide / sulfide prepared by the method is a pseudocapacitance type electrode material and has excellent energy storage property. The preparation process is simple, the laterite-nickel ore is used as a transition metal raw material, and the application of the pseudocapacitance capacitor in the field of energy storage can be promoted.

The present invention provides a cellulose-based porous carbon electrode material and a supercapacitor electrode prepared therefrom. The cellulose-based porous carbon electrode material is prepared by the following steps: Hydrazine hydrate, cellulose powder and nickel acetate hexahydrate are added to deionized water, ultrasonicated and uniformly mixed, and then the above mixture is transferred to the inner liner of a hydrothermal autoclave for hydrothermal reaction, filtered, washed and dried to obtain a cellulose-based carbon material; The cellulose-based carbon material is mixed with KOH, placed in a horizontal tubular furnace, and reacted under high temperature and in the presence of N2, and cooled to room temperature to obtain cellulose-based porous carbon; The cellulose-based porous carbon is stirred in an acid solution, washed to neutrality and dried to obtain the cellulose-based porous carbon electrode material. The cellulose-based porous carbon electrode material prepared by the present invention has the advantages of high specific surface area and cycle stability, as well as high specific capacitance and ideal pseudocapacitance.

The invention discloses a method for preparing a carbon nanotube-based composite microsphere energy storage material through continuous flow. The invention discloses a preparation method for constructing a microspherical composite carbon nanotube supercapacitor material based on microfluidics, and belongs to the technical field of supercapacitors. The method comprises the following steps: acidifying carbon nanotubes to improve dispersibility; the preparation method comprises the following steps: by taking dimethyl silicone oil as an oil phase and acidified carbon nanotube dispersion liquid as a water phase, regulating and controlling a flow rate ratio through a microfluidic technology, and preparing carbon nanotube microspheres with uniform sizes; performing high-temperature pyrolysis to obtain a conductive microsphere framework; the MF-CNTs (at) ZIF-8 composite material is obtained by taking the MF-CNTs (at) ZIF-8 as a carrier, performing in-situ growth of ZIF-8 through a solution impregnation method and then performing secondary pyrolysis. According to the method, accurate and controllable preparation of the carbon nanotube microspheres is realized, and a conductive network of the carbon nanotubes and high specific surface area and pseudocapacitance activity of the ZIF-8 are synergistically exerted by combining in-situ compounding of the ZIF-8. The specific capacitance of the prepared material in a 6 M KOH electrolyte reaches 356.2 F.g <-1 >, the rate capability is excellent, and the capacity retention rate is 81.6% after 3000 cycles. The method has the advantages of controllable steps, mild conditions, low cost, easiness in continuous production and large-scale application potential.

The invention relates to the technical field of supercapacitor materials, and particularly discloses a catechol modified activated carbon composite electrode material and a preparation method and application thereof. The preparation method of the composite electrode material comprises the following steps: adding a certain mass of activated carbon into a catechol solution, and dipping for 2-3 hours to form a mixed dispersion liquid; and then carrying out suction filtration on the mixed dispersion liquid under a vacuum condition, and drying in a drying oven overnight to obtain the product. The catechol is added into the activated carbon, the catechol and activated carbon particles can form a conductive network more beneficial to electron / ion transmission, an activated carbon framework is filled with catechol molecules through the capillary action, and the EDLC type specific capacity of the activated carbon under the large current density is improved. And meanwhile, catechol molecules can improve the pseudocapacitance type specific capacity of the composite material through a dual-electron redox system of the catechol molecules.

The invention discloses a double-shell high-nickel NCM composite positive electrode material and a preparation method thereof, and the preparation method comprises the following steps: drying and screening high-nickel NCM particles, depositing an Nb2O5 shell layer by using a doped niobium source composite precursor and an oxidizing agent through atomic layer deposition to obtain a precursor material, and depositing an La2O3 shell layer by using a lanthanide series metal source precursor and an oxidizing agent to obtain the double-shell high-nickel NCM composite positive electrode material. And finally performing inert atmosphere heat treatment to obtain a product. According to the material, a double-atomic-layer deposition structure of the inner layer Nb2O5 and the outer layer La2O3 is adopted, a synergistic effect is achieved through chemical bonding and the like, the outer layer La2O3 and Nb2O5 are coordinated to construct a compact interface, and electrolyte permeation is prevented; the crystal lattice matching performance is good, and the interface stress is relieved. The Nb < 5 + > / Nb < 4 + > provides a pseudocapacitance channel, the La2O3 oxygen vacancy promotes Li < + > adsorption, and ion conduction and rate performance are improved. In mechanics and thermology, the double layers share stress, crack is inhibited, electrolyte is isolated at high temperature, and oxygen release is delayed. The material remarkably reduces impedance increase and improves the long-cycle capacity retention rate.

The present invention provides a Nb2O5 composite material and a preparation method and application thereof, belonging to the field of inorganic nanomaterials and electrochemistry. The Nb2O5 composite material of the present invention has the advantages of high pseudocapacitance performance of Nb2O5 and high conductivity, high porosity and multiple energy storage sites of doped porous carbon: Nb2O5 has high pseudocapacitance performance in magnesium-lithium mixed electrolyte; the pores of porous carbon can realize contact between Nb2O5 and positive ions in the electrolyte, accommodate the penetration of positive ions, and improve the capacitance of the Nb2O5 composite material as a positive electrode material of magnesium-lithium mixed battery; and the nitrogen, sulfur and phosphorus co-doped with porous carbon can provide lithium or magnesium ion storage sites, further improving the capacitance of the Nb2O5 composite material; in addition, the core-shell structure of the Nb2O5 composite material and the porous structure in the shell work together to prevent Nb2O5 from being damaged by volume changes during the charge and discharge process, thereby improving the cycle stability.

The invention belongs to the technical field of supercapacitors and ion diodes, and discloses a quantum-capacitor-based supercapacitor diode and a preparation method thereof.The quantum-capacitor-based supercapacitor diode takes a quantum capacitor material as a working electrode of an active material, and the quantum capacitor material is a semiconductor material; a exists, so that the difference between the average quantum capacitance when the quantum capacitor material is the positive electrode and the applied voltage is [0V, + aV] and the average quantum capacitance when the quantum capacitor material is the negative electrode and the applied voltage is [-aV, 0V] is at least two orders of magnitude; wherein 0.3 < = a < = 2. The quantum capacitor-based supercapacitor diode is based on a quantum capacitor material, the one-way conductivity of the diode is successfully integrated into the supercapacitor by using the difference between positive and negative quantum capacitors, and the diode can operate in any electrolyte system without depending on pseudocapacitance reaction, so that the quantum capacitor-based supercapacitor diode is suitable for large-scale production. The method can be particularly applied to the fields of ion logic circuits, brain-computer interfaces, humanoid brain calculation and the like.

The invention relates to the technical field of high-performance thin film energy storage electrodes, and particularly discloses a preparation method of a high-performance graphene-based electrochemical energy storage electrode material. Comprising the following steps: taking ammonia water and deionized water to prepare a mixed solution, adding rhein, uniformly mixing, dipping a graphene oxide (GO) film into the solution, and carrying out hydrothermal reaction to obtain the Rhein (at) RGO film electrode material. The Rhein (at) RGO thin film with a porous structure is obtained by loading the Rhein (at) RGO thin film onto RGO through a simple hydrothermal method and a non-covalent modification method. And the RGO and the rhein generate a synergistic effect. The graphene skeleton of the Rhein (at) RGO can provide a channel for electrons to promote rapid transmission of the electrons, so that good rate capability is maintained, and the rhein can provide extra pseudocapacitance for the electrode through an oxidation-reduction reaction. The Rhein (at) RGO thin film electrode maintains good rate capability, and meanwhile, the specific capacitance of the material is greatly improved.

The invention relates to a carbon-based capacitor electrode material, a preparation method thereof and a carbon-based capacitor, and the preparation method comprises the following steps: carrying out the pulse discharge of carbon foam with the surface loaded with metal nanoparticles, and obtaining the carbon-based capacitor electrode material; the surface of the metal nanoparticles includes a carbon coating layer. A pulse discharge method is adopted to generate instantaneous high temperature within an extremely short time, the instantaneous high temperature is utilized to treat the carbon foam loaded with the metal nanoparticles on the surface, a part of the metal nanoparticles can catalyze decomposition and rearrangement of a surface carbon coating layer under the instantaneous high temperature condition, and sugar-coated haw-shaped carbon nanotubes grow on the surfaces of the metal nanoparticles, so that the carbon foam is prepared. When the electrode material is prepared, the energy storage area is increased, the number of active sites is increased, the remaining metal nanoparticles on the surface of the carbon foam migrate and provide abundant pseudocapacitance active sites, then preparation of the high-energy-storage carbon-based capacitor electrode material is achieved jointly, the preparation process is simple, rapid and efficient, and no dangerous and harmful product is contained.

The invention relates to the technical field of preparation of two-dimensional carbon plate electrode materials, and discloses a two-dimensional carbon plate and a preparation method and application thereof. The two-dimensional carbon plate contains a lamellar structure and further contains doping elements Fe, B and N. On the basis of the total amount of the two-dimensional carbon plate, the content of the doping element Fe is 0.8 wt%-3.5 wt%, the content of the doping element B is 5 wt%-8.8 wt%, and the content of the doping element N is 2.8 wt%-3.5 wt%. The conductivity of the material and the affinity of the material to a solution are enhanced through the Fe, B and N anion-cation co-doped carbon nanosheets; and the pseudocapacitance performance of the derived carbon material is also improved by doping multiple anions and cations. The two-dimensional nanostructure ensures that active sites derived from doping defects are highly exposed on the surface of the material, so that the active sites are effectively utilized.

The invention relates to the technical field of activated carbon production, in particular to a method for producing capacitive activated carbon from ultra-low-ash low-rank coal, which comprises the following steps: taking low-ash low-rank coal as a raw material, and effectively removing ash and inorganic salt through crushing, deionized water cleaning and vacuum drying; the pore structure is optimized through activating agent mixing and microwave assistance, and the mesoporosity is improved; carrying out post-treatment, removing the residual activating agent through diluted hydrochloric acid ultrasonic cleaning, and drying and forming; finally, a high-density oxygen / nitrogen-containing functional group is introduced through oxidizing agent surface modification and urea high-temperature nitrogen doping, and the pseudocapacitance effect and the electrochemical performance are remarkably enhanced. Through repeated cleaning with deionized water and combination of vacuum drying, the ash removal rate is increased to 95% or above, oxidation side reaction is avoided, and the purity of the raw materials is guaranteed; meanwhile, microwave-assisted activation is introduced, intercalation reaction of the activating agent and coal is accelerated by microwave selective heating, and mesoporous generation is promoted by microwave-induced molecular vibration.

The invention discloses a copper complex composite carbon electrochemical material as well as a preparation method and application thereof, and belongs to the technical field of electrochemical energy storage materials. The flexible sulfur-containing carboxylic acid ligand and the transition metal are compounded through a hydrothermal or solvothermal method to form the copper complex with a potential pore structure, the copper complex / C composite carbon electrochemical energy storage material is further prepared, and the pseudocapacitance contribution rate of the copper complex / carbon composite material can reach 81% or above. The prepared material is stable in structure and keeps good thermal stability at the temperature of 200 DEG C or below.

The invention belongs to the technical field of activated carbon, and particularly relates to a preparation method of high-specific-capacitance activated carbon for a supercapacitor. The preparation method comprises the following steps: carbonizing coconut shells, crushing, uniformly mixing the obtained carbonized crushed material with an alkali activator, pre-activating, and grinding to obtain a pre-activated material; the pre-activation condition is inert atmosphere, the temperature is 450-550 DEG C, and the temperature is kept for 0.5-1.5 h; the preparation method comprises the following steps: dissolving phenolated lignin in alkali liquor, adding pyridine diamine and a formaldehyde solution, uniformly mixing and reacting to obtain phenolated lignin modified amine; adding phenolated lignin modified amine, dialdehyde and a catalyst into an organic solvent, uniformly mixing, adding the pre-activated material, performing ultrasonic dispersion, and performing heating reflux reaction to obtain a coated modified pre-activated material; and activating the coated modified pre-activated material, pickling, washing and drying to obtain the high-specific-capacitance activated carbon for the supercapacitor. The phenolated lignin modified amine and the dialdehyde are cured and crosslinked on the inner wall and the surface of the pores of the pre-activated material, and the nitrogen-doped mesoporous carbon is formed through activation, so that the situation that nitrogen functional groups are introduced into pseudocapacitance due to excessive etching of the initial pores of the pre-activated material is avoided.

The invention belongs to the technical field of battery materials, and particularly relates to a composite positive electrode material, a preparation method thereof, a positive plate and a secondary battery. The composite positive electrode material comprises an N-doped MXene carrier and a positive electrode active material grown in the N-doped MXene carrier in situ, the positive electrode active material comprises metal element doped lithium iron phosphate, and the positive electrode active material has a rice-grain-like morphology structure. In the composite positive electrode material, N-doped MXene serves as a three-dimensional conductive skeleton, pyridine nitrogen and pyrrole nitrogen provide defects due to doping of N atoms, and N-doped MXene serves as a lithium ion adsorption site to improve pseudocapacitance contribution. According to the lithium iron phosphate, grains are refined through metal doping, the b-axis and unit cell volume of the lithium iron phosphate are shortened, and Li-O bonds are increased, so that a lithium ion diffusion channel is shortened, and the diffusion rate is increased. Due to the rice-like morphology structure, the diffusion distance of lithium ions in the positive electrode active material is greatly shortened, and the rate capability is improved.

The invention discloses a pseudocapacitance supercapacitor electrode material, a hydrogenated TiO2 nanotube and a preparation method, and belongs to the technical field of supercapacitor electrode material preparation. The invention relates to a method for preparing a hydrogen-doped titanium dioxide nanotube array (H-TiO2NTs) by using a surface hydrogenation method at normal temperature and normal pressure, and the hydrogen-doped titanium dioxide nanotube array (H-TiO2NTs) is used for loading MnO2 so as to improve the energy density and the power density of a super capacitor positive electrode material and a water-phase asymmetric super capacitor. The H-TiO2NTs is successfully prepared by taking dilute sulphuric acid, Zn and TiO2NTs as raw materials under the conditions of normal temperature and oxygen production for the first time, and the H-TiO2NTs is used as a matrix to load MnO2 through electro-deposition. The conductivity of the H-TiO2NTs is increased, so that the electrochemical energy storage performance of the composite electrode material is excellent. Compared with a traditional hydrogen atmosphere and high-temperature calcination hydrogen doping method, the method is simple in experimental condition, efficient, economical and environmentally friendly, and has a wider application prospect.

The invention belongs to the technical field of electrode materials, and particularly relates to a FePO4-coated MHM composite material and a preparation method and application thereof. In order to improve the stability and selectivity of a CDI electrode material, a pseudocapacitance material FePO4 is combined with a double-electrode-layer material MHM (MXene of a three-dimensional hollow microsphere structure) with a pseudocapacitance attribute, the FePO4-MHM composite material is successfully prepared, FePO4 particles are uniformly distributed on the surfaces of MXene-based hollow microspheres, a three-dimensional structure with a high specific surface area and rich ion adsorption sites is formed, and the stability and selectivity of the CDI electrode material are improved. The FePO4-coated MHM composite material also shows excellent desalination performance in a CDI device.

An anode material for an aqueous calcium ion battery and an aqueous calcium ion battery. The anode material for the aqueous calcium ion battery includes nitrogen and antimony co-doped graphene that can reversibly chemisorb / desorb cations Ca<supgt;2+< / supgt> that make up calcium salts, and the graphene is monolayer graphene; the nitrogen doping content of the nitrogen and antimony co-doped graphene is 6.94 at%, and the antimony doping content is 0.74 at%. The monolayer rate of the monolayer graphene is ≥90%. The specific doping structure of the nitrogen and antimony co-doped graphene anode material for the aqueous calcium ion battery of the present invention also combines the pseudocapacitance effect brought about by the doping of nitrogen and antimony heteroelements. It has chemisorption at specific sites, generating good pseudocapacitive Ca<supgt;2+< / supgt> storage capacity; in addition to having a high capacity, this material also has a high power density, with an energy density of 2.16 Whkg<supgt;‑1< / supgt> and a power density of 777.6 Wkg<supgt;‑1< / supgt>.

The invention provides a printable and recyclable light-assisted enhanced supercapacitor and a preparation method thereof, and belongs to the field of supercapacitors. Metal oxide (TMO) and liquid metal (LM) are combined through a mechanical grinding method, and composite material slurry is prepared by adjusting the content of the metal oxide. The liquid metal provides high conductivity for the electrode, and the metal oxide serves as an active material of the electrode to provide pseudocapacitance performance and also serves as a solid filler to adjust the surface tension of the LM, so that the composite material can construct an accurate electrode structure. And under photostimulation, photoexcitation carriers of the two are synergistically combined to form coordinate bonds and lattice distortion, so that the electrochemical performance of the supercapacitor can be improved. And the supercapacitor unit can be randomly integrated through printing according to different energy and voltage requirements, so that the application range of a next-generation microelectronic device is expanded. Meanwhile, the expensive LM can be recycled from the super capacitor, so that repeated utilization is realized, and electronic waste is reduced.