76 results about "Sodium supplements" patented technology

The preparation method comprises the following steps: S1, mixing a hydrochloric acid solution with organic sodium sulfonate, then adding aniline and water, stirring and dissolving, then adding an oxidizing agent to carry out doping reaction, and carrying out suction filtration, washing, drying and grinding on a reaction product to obtain sodium-modified polyaniline; s2, uniformly mixing a negative electrode active material, a conductive agent and polytetrafluoroethylene, and then adding sodium polyaniline and an organic sodium supplement agent in a nitrogen or inert atmosphere for fibration treatment to obtain fibration powder; and S3, performing hot pressing on the fiberized powder onto the current collector to obtain the lithium ion battery. The prepared pre-sodium-modified negative electrode dry-method electrode has relatively good peeling strength and pole piece flexibility, and the condition that a traditional wet-method thick electrode is easy to crack is relieved; meanwhile, the dry-method electrode subjected to sodium modification treatment can induce uniform deposition of sodium ions, so that the dynamic performance of the whole sodium battery is improved, the problem of cyclic sodium precipitation is avoided, and the service life of the battery is further prolonged.

The invention relates to the technical field of battery sodium supplementation agents, in particular to a sodium supplementation agent with a core-shell structure, a preparation method and a positive pole piece. The preparation method comprises the following steps: providing a core material containing sodium salt; a first coating process: providing a first coating material containing organic fluorine, mixing the core material containing the sodium salt with the first coating material, and performing first sintering to obtain a primary coating coated with a first coating layer; and a second coating process: providing a second coating material containing a carbon source, mixing the second coating material with the primary coating, and carrying out second sintering to obtain the sodium supplement which is coated with a first coating layer and a second coating layer and has the core-shell structure. The invention provides the sodium supplementing agent with the core-shell structure, the preparation method and the positive pole piece, so that the problem of poor sodium supplementing performance of the sodium supplementing agent in the related technology is solved.

The present application relates to the technical field of energy storage devices, and particularly relates to a sodium supplement, a positive plate, a preparation method of the positive plate and an electric device. The composite sodium supplement is located in the positive plate of a sodium ion energy storage device, and the composite sodium supplement comprises: a first sodium supplement and a second sodium supplement, the first sodium supplement has a first oxidation potential, the second sodium supplement has a second oxidation potential, the first oxidation potential is less than 3.9V, and the second oxidation potential is 3.9V-4.4V. Since the composite sodium supplement is arranged in the positive plate, the composite sodium supplement has the advantages of easy operation and processing, reduced processing procedures, no harsh processing conditions and the like, and can realize industrial application. In addition, the composite sodium supplement has a relatively comprehensive sodium supplement function, can form a certain oxidation potential gradient, and realizes the effect of gradient sodium supplement. The sodium ion energy storage device can realize full-stage sodium supplement from the initialization stage to the subsequent cycle charging and discharging stage, and then the electrochemical performance of the sodium ion energy storage device is improved from the entire process of formation to cycle charging and discharging.

The invention provides a preparation method of a sodium sulfide carbon confinement pre-sodium coating based on monatomic catalysis, and belongs to the technical field of sodium battery materials. Comprising the following steps: mixing cobalt phthalocyanine and melamine powder, performing ultrasonic-assisted mechanical stirring, drying and grinding to obtain composite powder; mixing with sodium sulfate and polyvinylpyrrolidone in proportion, stirring, drying and grinding to obtain precursor powder; the precursor powder is sintered in an argon atmosphere, so that sodium sulfate is converted into sodium sulfide in situ, cobalt atoms in cobalt phthalocyanine are dispersed in a carbon network in a monatomic state, and a monatomic cobalt catalysis-carbon confinement sodium sulfide composite material is prepared; mixing the composite material with a conductive agent, a first binder and a first organic solvent, and performing stirring and defoaming stirring to prepare slurry; and coating the surface of a positive electrode material with the slurry to form a sodium supplementing interface layer, and performing vacuum drying to obtain the positive electrode with the sodium pre-coating. The problems of initial cycle sodium loss and long-term cycle performance reduction of the sodium-ion battery, defects of traditional sodium salt supplementation and the like are solved.

The invention discloses a water-based compensation sodium source sodium ion battery positive pole piece and a preparation method thereof. Mixing a positive active material, a conductive agent, a water-based binder, a water-soluble sodium supplement agent and a solvent to obtain positive slurry; wherein the water-soluble sodium supplement comprises sodium nitrite, sodium oxalate and sodium citrate; the solvent is water; and coating the surface of a current collector with the positive electrode slurry to prepare the positive electrode plate. Deionized water is used for replacing a traditional organic solvent to serve as a pulping solvent, and dual-function optimization is achieved by adding a specific water-soluble sodium supplementing agent. The sodium supplementing agent is uniformly distributed in the pole piece through a dissolution-recrystallization mechanism, and an efficient sodium ion pre-compensation system is formed. According to the method, the production cost and the energy consumption are remarkably reduced, the structural degradation of the positive active material in a water system environment can be effectively inhibited, irreversible sodium loss caused by formation of a first-week solid electrolyte interface (SEI) of a negative electrode is counteracted through a sodium source compensation mechanism, and the method has remarkable environmental friendliness and industrial application value.

The application provides a preparation method of a precursor pre-adsorption sodium-supplemented sodium iron phosphate pyrophosphate positive electrode material, uses hydrated iron phosphate as a precursor, and places the precursor in a sodium salt of an organic weak acid sodium supplement solution for impregnation adsorption, and after drying, is mixed with a sodium source, a phosphoric acid source, a pyrophosphoric acid source and a carbon source, and is sintered in an inert atmosphere to obtain a pre-sodium-supplemented Na4Fe3(PO4)2P2O7 / C material. The application also provides a sodium iron phosphate pyrophosphate positive electrode material prepared by using the above method, and a sodium ion battery comprising the material. By impregnating and adsorbing the sodium salt of the organic weak acid sodium supplement on the industrial precursor of the sodium iron phosphate pyrophosphate, the nanoscale dispersion of the sodium supplement is achieved, the toxicity and high gas production of the traditional sodium supplement are avoided from the root, the process is adapted to the existing industrial production line, the first coulomb efficiency and the cycle stability of the sodium iron phosphate pyrophosphate positive electrode material are effectively improved, and the industrial application is promoted.

The invention discloses a sodium supplementing method of a sodium-ion battery and application of the sodium supplementing method, and belongs to the technical field of sodium-ion batteries. The sodium supplementing method of the sodium ion battery comprises the following steps: adding a sodium supplementing agent into negative electrode slurry to prepare a negative electrode plate; the negative plate is used for assembling a dry battery, and sodium supplementation of the sodium ion battery is completed through baking, liquid injection, positive and negative electrode reverse charging, formation, aging and capacity grading. According to the invention, a mode of combining negative electrode sodium supplement and reverse charging is adopted, a proper sodium supplement agent is introduced into the negative electrode slurry, and then the sodium supplement agent can be fully decomposed and released through reverse charging, so that the number of freely shuttling sodium ions in the sodium-ion battery is increased, the battery capacity is improved, and finally the energy density of the battery is improved; the steps are simple, meanwhile, the problem of dead quality caused by sodium supplement residues in an existing sodium supplement technology is solved, the process compatibility is good, and industrial application can be achieved.

The application provides a preparation method of a sodium supplement agent with high conductivity, comprising the following steps: S1) soaking bacterial cellulose in a sodium carbonate solution, and then freeze-drying to obtain product A; S2) calcining the product A in a protective atmosphere to obtain product B; and S3) mixing an aqueous oxalic acid solution with the product B, and then standing to obtain the sodium supplement agent. Compared with the prior art, the sodium supplement agent prepared by the method can supplement the consumption of sodium ions in the positive electrode material in the circulation process, and the sodium supplement agent has excellent controllability as the porous carbon carrier can effectively improve the conductivity of the sodium supplement agent as a skeleton, the high conductivity improves the DCR of the sodium ion battery, improves the kinetic performance, and thus improves the electrochemical performance of the sodium ion battery.

A sodium supplement material, a preparation method thereof, positive electrode plate, and sodium-ion battery. The sodium supplement material includes a sodium supplement agent body and first particles exposed on the surface of the sodium supplement agent body. In any 300 nm×200 nm region on the surface of the sodium supplement material, the number of first particles ranges from 2 to 20. The first particles include one or more conductive agent particles and one or more catalyst particles.

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

The present application relates to the field of battery, especially to a gradient pore hierarchical nitrogen-doped carbon-coated composite sodium supplement agent and its preparation method and application, comprising: a composite sodium supplement agent core and a coating layer coated on the surface of the composite sodium supplement agent core; wherein the composite sodium supplement agent core comprises: an inorganic sodium supplement phase and an organic sodium supplement phase; the coating layer comprises from inside to outside: an inner dense amorphous carbon layer, a middle mesoporous carbon layer and an outer macroporous carbon layer. The present application innovatively designs a gradient pore carbon coating structure from inside to outside, the inner dense amorphous carbon layer realizes efficient isolation protection, the middle mesoporous carbon layer solves the problem of ion transmission obstruction, and the outer macroporous carbon layer improves the electronic conduction and volume buffering capacity, completely solving the inherent contradiction between the denseness of the traditional carbon coating layer and ion transmission, realizing the synergy and unity of "isolation protection-ion transmission-electronic conduction".

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a composite sodium supplement additive which comprises the following raw material components: disodium iminodiacetate, conductive porous carbon and a metal oxide quantum dot catalyst, the metal oxide quantum dot catalyst is coated with the disodium iminodiacetate active particles, and the disodium iminodiacetate active particles are adsorbed on the inner wall and the outer wall of the conductive porous carbon to form the composite sodium supplement additive, and the particle size of the composite sodium supplement additive is 1-500 nm. The composite sodium supplement additive takes conductive porous carbon as a load matrix; the conductive porous carbon comprises any one or more of activated carbon, carbon nanotubes, ordered mesoporous carbon and bamboo charcoal. The active ingredients in the composite sodium supplement agent are small in particle size, good in conductivity and low in decomposition voltage, and an excellent sodium supplement effect can be achieved under the condition of low addition.

The invention discloses a current collector, a secondary battery and a power utilization device, and belongs to the technical field of batteries, the current collector comprises a polymer layer and a matrix layer located on at least one surface of the polymer layer, through holes are formed in the matrix layer, the polymer layer comprises an active ion supplement, and the active ion supplement is formed in the matrix layer. The active ion supplement comprises at least one of a lithium supplement agent and a sodium supplement agent, and active ions generated by decomposition of the lithium supplement agent or the sodium supplement agent can enter the through holes and enter the pole piece (the positive pole piece and / or the negative pole piece) to form a film, so that the loss of the active ions (lithium or sodium) for pole piece film formation is reduced, and the film formation efficiency is improved. And by-products (such as gas) generated by the active ion supplement are discharged from the end surface (side surface) of the polymer layer or are left in the polymer layer, so that the influence on the internal resistance of the pole piece is small, the risk of causing the side reaction of the positive and negative poles is reduced, and the energy density and the cycle life of the secondary battery can be remarkably improved.

The invention provides a multiphase composite sodium manganate-based material as well as a preparation method and application thereof. The multiphase composite sodium manganate-based material comprises a P2 phase, an alpha-NaMnO2 phase and a beta-NaMnO2 phase, wherein the mass fraction of the P2 phase is more than 55 wt%. On one hand, the alpha-NaMnO2 phase and the beta-NaMnO2 phase can play a role of a sodium supplementing agent, and the defect that the P2 phase is low in capacity is overcome; and on the other hand, the P2 phase, the alpha-NaMnO2 phase and the beta-NaMnO2 phase coexist in the same crystal lattice, so that the entropy value of the positive electrode material can be improved, and more phase changes of a sodium manganate system can be fully inhibited, thereby realizing higher multiplying power and cycle performance. The sodium ion battery prepared by taking the multi-phase composite sodium manganate-based material as a positive electrode active material has excellent capacity, rate capability and cycle performance.

The invention relates to sodium ion battery positive electrode slurry, a preparation method thereof and a sodium ion battery. The preparation method comprises the following steps: mixing a sodium supplementing agent and a first solvent to obtain a sodium supplementing agent solution; mixing the sodium supplementing agent solution and the positive electrode main material to obtain sodium ion battery positive electrode slurry; the sodium supplementing agent comprises benzene sodium salt; the first solvent comprises an alcohol solvent and a dispersing agent. According to the preparation method, the adopted alcohol solvent can increase the solubility of the organic sodium salt, and the dispersing agent can prevent agglomeration of the sodium supplementing agent, so that the sodium supplementing agent can be better dispersed. According to the preparation method, a special process is not needed, and the preparation method can be realized by stirring a kettle at normal temperature in a positive electrode slurry mixing workshop. The processes of extra pulping and coating of sodium benzene salt are avoided, and the preparation process is simplified. The sodium ion battery provided by the invention has high first efficiency and long cycle life.

The invention belongs to the technical field of sodium ion battery materials, and particularly relates to a sodium-containing modified polyvinylidene fluoride binder as well as a preparation method and application thereof. The sodium-containing modified polyvinylidene fluoride binder comprises a sodium-containing functional unit-polyvinylidene fluoride copolymer, alkannin and a lophatherum gracile polysaccharide stabilizer, wherein the alkannin is grafted on the surface of the sodium-containing functional unit-polyvinylidene fluoride copolymer; the sodium-containing functional unit is combined with a polyvinylidene fluoride main chain through covalent bond grafting. According to the preparation method, the sodium-containing functional unit-polyvinylidene fluoride copolymer is prepared, polyvinylidene fluoride has a bonding function, the sodium-containing functional unit can release sodium ions, compensate sodium loss of the first cycle of the positive electrode and improve the first effect performance, and the sodium-containing functional unit and the polyvinylidene fluoride are connected through a covalent bond to construct a sodium ion conduction channel, so that the conductivity of the sodium ions is improved; meanwhile, a sodium supplementing agent and a conductive polymer with a certain volume are prevented from being introduced into the binder, and the high-activity substance proportion and the binding performance of the binder can be kept.

The invention belongs to the technical field of electrochemical sodium ion batteries, and discloses a sodium supplement additive based on a heterostructure and a preparation method and application thereof.The preparation method comprises the following steps that 1, five or more sodium-containing compounds are jointly dispersed in a solvent, and slurry A is obtained after stirring; (2) adding a conductive carbon material or a carbon preparation precursor into the slurry A, and stirring to obtain slurry B; (3) sanding the slurry B to obtain uniformly dispersed slurry C; (4) carrying out spray drying granulation on the slurry C to obtain precursor powder; and (5) in an inert atmosphere, carrying out heat treatment on the precursor powder, and cooling to obtain the sodium supplement additive based on the heterostructure. The sodium-supplementing additive with the heterostructure is prepared by taking five or more sodium-containing compounds as raw materials, performance parameters such as sodium-supplementing capacity and decomposition voltage of the additive can be optimized, and the sodium-supplementing additive is particularly suitable for a positive electrode plate of a sodium-ion battery.

The invention relates to the technical field of batteries, in particular to a sodium ion battery, a preparation method thereof and a power utilization device. The sodium-ion battery provided by the invention comprises an electrolyte, wherein the electrolyte contains a sodium-supplementing sustained-release capsule; the sodium-supplementing sustained-release capsule comprises a sustained-release shell and a sodium supplementing agent, wherein the sodium supplementing agent is accommodated in the sustained-release shell. According to the sodium ion battery provided by the invention, too high concentration of sodium ions in the electrolyte caused by decomposition of a large number of sodium ions in the early-stage charge-discharge cycle is avoided, and in the long-term charge-discharge cycle process, the slow-release shell is slowly decomposed under an electric field and high temperature to release the internal sodium supplementing agent, so that the effect of long-term sodium supplementing can be achieved, and the service life of the sodium ion battery is prolonged. Furthermore, the capacity retention ratio and the performance exertion of the battery after long-term circulation are improved; and the sodium supplementing method is safe, simple, low in cost and convenient for large-scale industrial production.

The application provides a sodium supplement, a sodium ion battery, an electronic device and a preparation method of the sodium supplement, and belongs to the technical field of secondary batteries. The sodium supplement comprises a core and a coating layer. The core comprises a sodium supplement material. The coating layer comprises a carbon material, metal atoms and non-metal atoms, wherein the metal atoms and the non-metal atoms are located in the carbon material; and the metal atoms comprise at least one of noble metal atoms and transition metal atoms. The sodium supplement can effectively reduce its own decomposition gas, avoid the side reaction of the gas with an electrolyte and a sodium-embedded negative electrode material, and thus ensure the improvement effect of the sodium supplement on the energy density and the cycle life of the battery.

The application discloses a composite sodium supplementing agent and a preparation method and application thereof. m A, wherein A is an anion, and m is the number of sodium ions satisfying charge conservation. The composite sodium supplementing agent is added into a positive plate as a battery additive, can realize one-time sodium ion compensation in the first charging and discharging process of the battery, supplement the sodium ions consumed in the irreversible process such as SEI formation in the initial cycle, effectively improve the initial coulomb efficiency and reversible capacity of the battery, and improve the cycle stability, so that the overall electrochemical performance of the sodium ion battery is improved.

The invention provides a diaphragm and a preparation method thereof, a battery, a battery pack and electric equipment, the diaphragm comprises a base membrane and a functional coating located on at least one side surface of the base membrane, the functional coating comprises a sodium supplementing agent, and the sodium supplementing agent comprises aromatic diphenol sodium. According to the invention, the first coulombic efficiency, the low-temperature rate capability, the high-temperature cycle life and other performances of the battery can be improved.

The invention relates to a sodium supplementing agent and a preparation method thereof, a sodium ion battery positive plate and a sodium ion battery, the chemical structural formula of the sodium supplementing agent is NaB (OSiR1R2R3) 3X, R1, R2 and R3 are independently selected from alkyl or phenyl, and X is selected from F or Cl. The oxidation potential of the sodium supplementing agent ranges from 3.5 V to 3.85 V, the sodium supplementing agent is suitable for the working voltage of a current sodium ion battery, and the sodium supplementing effect is excellent. Moreover, in the presence of oxygen, the sodium supplementing agent can react to generate B2O3, SiO2 and NaX, a composite interfacial film composed of B2O3, SiO2 and NaX has excellent thermal stability and certain heat conduction performance, and the high-temperature stability of the sodium ion battery can be remarkably improved.

The invention discloses a metal organic framework-based sodium supplement and a preparation method and application thereof, and the preparation method of the sodium supplement comprises the following steps: S1, dissolving a metal source and 2-sulfonic acid terephthalic acid monosodium salt in a solvent to obtain a precursor solution; and S2, transferring the precursor solution into a reaction kettle, carrying out a heating reaction, collecting a precipitate after the reaction is finished, washing, and drying to obtain the sodium supplementing agent based on the metal organic framework. Sodium ions in the sodium supplementing agent prepared by the method are combined with sulfonate radicals in a ligand through strong electrostatic interaction, so that the sodium ions are fixed in an MOF framework, and in the charging process, the sodium ions and the sulfonate radicals can be dissociated by electrochemical driving force, so that the sodium supplementing agent is formed. The released sodium ions are driven by an external electric field to quickly migrate into an electrolyte through MOF pore channels to participate in battery reaction, and the structure of the sodium supplementing agent is kept stable after the sodium ions are released, so that the sodium ion battery containing the sodium supplementing agent has high initial charging efficiency and excellent cycling stability.

This invention discloses a Na2Se@C composite sodium supplement, its preparation method, and its application. The supplement comprises Na2Se and carbon coated on the surface of Na2Se, wherein the mass percentage of Na2Se is 80wt%–98wt%, and its particle size is 1–10μm. The preparation method includes the following steps: [The text abruptly ends here, so the translation stops.] x O y Selenium source and carbon are dried and purified before pretreatment, where x = 1, 2, y = 0, 2, 3, 4. The pretreated selenium source and carbon are thoroughly mixed, ground, and sieved at a mass ratio of 1:0.1 to 0.5 to obtain a mixture. The mixture is annealed in an inert gas atmosphere, heated to 500-900℃ and held at that temperature, and then cooled to obtain Na2Se@C composite sodium supplement. This invention can solve the problems of gas generation and inert substance residue in the sodium supplementation process of existing sodium supplements. The synthesis method is simple, safe, and efficient, and can improve the energy density of batteries.

The application discloses a sodium supplement modification method for a negative-electrode-free sodium battery and the negative-electrode-free sodium battery. A composite positive electrode sodium supplement agent is added in a positive electrode active material; the composite positive electrode sodium supplement agent is composed of a sodium-rich layered oxide of a sodium ion battery and sodium carbonate; the mass of the composite positive electrode sodium supplement agent is 0.5wt%-10wt% of the total mass of the positive electrode active material; meanwhile, an electrolyte sodium supplement agent is added in an electrolyte; the added amount of the electrolyte sodium supplement agent is 1wt%-4wt% of the total mass of the electrolyte; and the mass ratio of the added amount of the electrolyte sodium supplement agent to the added amount of the composite positive electrode sodium supplement agent is in the range of 0.2-2:1. Through the cooperation of the electrolyte sodium supplement and the positive electrode sodium supplement, the application realizes rapid sodium supplement, continuous sodium supplement and interface optimization, effectively compensates for the irreversible sodium loss in the first charge-discharge process of the negative-electrode-free sodium battery, significantly improves the first coulomb efficiency, the energy density and the cycle stability of the battery, and promotes the large-scale application of the negative-electrode-free sodium battery.

The invention provides a sodium ion battery, a preparation method thereof and electric equipment, the sodium ion battery comprises a sodium supplementing agent and an accelerant, and the accelerant is suitable for promoting the sodium supplementing agent to decompose to generate sodium ions. The sodium ion battery provided by the invention can effectively promote the decomposition of the sodium supplement agent, reduce the probability of side reaction caused by the undecomposed sodium supplement agent in the battery, and generate more active sodium ions to supplement sodium to the negative electrode, thereby effectively improving the cycling stability of the battery.

The invention provides a sodium supplementing agent, a sodium ion battery and a preparation method of the sodium supplementing agent, and belongs to the technical field of secondary batteries, and the sodium supplementing agent comprises an inner core and a coating layer. Wherein the inner core comprises a sodium supplementing material and a lithium supplementing material; the coating layer includes a carbon material. The sodium supplementing agent provided by the invention effectively improves the gram volume development and cycle life of the sodium ion battery.

The application provides a sodium-ion battery negative electrode sheet cold spraying sodium supplement device and a sodium supplement method, and relates to the technical field of sodium-ion battery processing. The sodium-ion battery negative electrode sheet cold spraying sodium supplement device comprises a sodium supplement operation table, and the upper surface of the sodium supplement operation table is fixedly connected with a sodium supplement spraying box. In the application, a cold air blower and a first air compressor are started, cold air is pressurized by the first air compressor, and then is delivered to the sodium powder inlet pipeline inside through a first gas pipeline. High-pressure gas blows the sodium powder in the sodium powder inlet pipeline inside to the inside of three sodium powder delivery pipelines. A second air compressor is started, high-pressure air is sent into the gas output main pipeline by the second air compressor, and then is delivered into the three sodium powder delivery pipelines through three second gas pipelines to pressurize and deliver the sodium powder again. Finally, the sodium powder is sprayed out of the multiple sodium powder spraying branch pipelines along with the high-pressure gas, so that the sodium powder is sprayed on the negative electrode sheet to supplement sodium, and the process is efficient and safe.

The invention provides a sodium supplementing agent, a sodium ion battery, electronic equipment and a preparation method of the sodium supplementing agent, and belongs to the technical field of secondary batteries, and the sodium supplementing agent comprises an inner core and a coating layer. Wherein the inner core comprises a sodium supplementing material; the coating layer comprises a carbon material, metal atoms and non-metal atoms, and the metal atoms and the non-metal atoms are located in the carbon material; the metal atoms comprise at least one of noble metal atoms and transition metal atoms. The sodium supplementing agent effectively reduces gas generated by self decomposition, and avoids side reaction of gas, electrolyte and a sodium-embedded negative electrode material, so that the improvement effect of the sodium supplementing agent on the energy density and cycle life of the battery is ensured.

The invention relates to the technical field of sodium-ion batteries, in particular to a novel asphalt sodium-supplementing pore-forming improved hard carbon material as well as a preparation method and application thereof. According to the experiment, nitric acid is used as an oxidizing agent, the raw material asphaltene is oxidized to obtain a hard carbon precursor, sodium azide is used as a sodium-supplementing pore-forming agent, the asphalt is rapidly heated to be subjected to graphitization removal through a micro-plasma synthesis technology, meanwhile, sodium azide is decomposed at high temperature to perform sodium-supplementing pore-forming on asphalt hard carbon, and the effects of reducing graphitization and optimizing pore-forming are achieved; according to the present invention, the sodium supplementing efficiency is improved, the energy consumption is reduced, the negative electrode active material has advantages of high specific surface area and more active sites in the presence of the pore-forming agent, and the assembled battery has advantages of large specific capacity, low first-circle loss rate and the like. The novel asphalt sodium-supplementing pore-forming improved hard carbon material provided by the invention has the advantages of large specific surface area and more active sites, and the assembled sodium ion battery has excellent electrochemical performance.