606 results about "Sodium-ion battery" patented technology

The invention relates to a method for preparing a lithium iron phosphate / carbon composite material of a lithium ion battery, which belongs to the technical field of lithium ion batteries. The method for preparing the lithium iron phosphate / carbon composite material of the lithium ion battery comprises the following steps of: 1) preparing a suspending graphene-dispersed aqueous solution system, namely, crushing graphite to 1 to 5 microns, adding the crushed graphite into distilled water or purified water, adding 0.1 to 5 percent of surfactant, heating with stirring the mixed solution to 180 to 250 DEG C in a sealing way, performing stirring for 2 to 6 hours and reducing the temperature; 2) crushing lithium iron phosphate to the particle size of 1 to 5 microns, adding the crushed lithium iron phosphate into the distilled water or the purified water, adding with stirring 0.01 to 1 percent of coupling agent, performing uniform stirring, adding the graphene-dispersed aqueous solution, and performing stirring and filtration; and 3) vacuum-drying solid powder obtained by the filtration, and calcinating the dried solid powder for 2 to 12 hours to obtain the graphene-coated lithium iron phosphate cathode material. The method has the advantages of simple process, high material performance, high conductivity, high bulk density, high compacted density and the like.

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.

This invention relates to a boron-doped multi-element polyanionic sodium-ion battery cathode material and its preparation method, comprising the following steps: [The method involves] mixing Na₄Fe₂O₃ with... 3‑X B X (PO4) 2‑Y (SiO4) Y The stoichiometric ratio of P2O7 is determined by adding ferrous source, boric acid, sodium source, phosphorus source, and silicon source to water, followed by the addition of carbon source and mixing thoroughly to obtain a mixed slurry; wherein 0.2≤X≤0.5, 0<Y≤1; the mixed slurry is then ground to obtain a sand-milled slurry; the sand-milled slurry is dried to obtain precursor powder; under a protective atmosphere, the precursor powder is sintered at 450~550℃ to obtain boron-doped multi-element polyanion sodium-ion battery cathode material. The introduction of boron and silicon elements in this invention helps reduce raw material costs, improve the electrochemical performance of the material, especially enhancing the structural stability, rate performance, and cycle life of the cathode material, and also lowers the sintering temperature, meeting the requirements for cost reduction and efficiency improvement.

This invention discloses a rare-earth metal gradient-doped polyanionic cathode material, its preparation method, and its application. The molecular formula of the rare-earth metal gradient-doped polyanionic cathode material is Na. 2+2x‑y RE y Fe 2‑x (SO4)3, in the rare earth metal gradient-doped polyanionic cathode material, rare earth metal elements enter the crystal lattice of the polyanionic cathode material in the form of rare earth metal ions, and the doping content of the rare earth metal ions decreases in a gradient along the direction from the crystal lattice surface to the bulk phase. The polyanionic cathode material is an Alluaudite-type sodium iron sulfate cathode material. This invention effectively solves the kinetic mismatch problem of "fast ions but slow electrons" in rate performance by simultaneously optimizing the electronic structure and sodium ion channels through rare earth doping, significantly improving the structural stability of the material under long-cycle and fast-charge-discharge conditions. Simultaneously, the assembled sodium-ion battery exhibits excellent wide-temperature performance.

This invention belongs to the technical field of sodium-ion battery electrode materials, specifically relating to a preparation method and application of an air-stable molten asphalt-coated sodium selenide composite cathode sodium replenisher. The invention first prepares pure-phase sodium selenide nanoparticles in a glove box by room temperature stirring. Then, asphalt is grown in situ on the surface of the sodium selenide through ball milling and high-temperature calcination, thereby forming a core-shell structured sodium selenide composite sodium replenisher material coated with molten asphalt. The resulting composite sodium replenisher is stable in air for extended periods without deterioration, while simultaneously reducing the decomposition potential of sodium selenide and improving its decomposition efficiency. Coupled with a layered oxide cathode, it can achieve cathode sodium replenishment, compensating for the loss of active sodium caused by the growth of the SEI film on the surface of the hard carbon anode. Furthermore, its decomposition product, selenium, can inhibit the lattice oxygen evolution of the layered oxide cathode, improving the structural stability of the cathode and thus effectively enhancing the battery's initial efficiency and cycle performance, demonstrating promising commercial application prospects.

The application discloses a kind of aqueous sodium-ion battery electrolyte hydration cell desolvation path screening method, comprising the following steps: step 1: constructing and optimizing the structure model of anion and cation of electrolyte dissolution in electrolyte and aqueous sodium-ion battery electrolyte system model: step 2: the ion hydration cell structure evolution in electrolyte is simulated;Step 3: extracting and optimizing steady-state ion hydration cell from the simulation results of step 2;Step 4: the desolvation path of steady-state ion hydration cell obtained in step 3 is analyzed, and the best path of steady-state ion hydration cell desolvation is obtained.The present application takes the ion hydration mechanism in aqueous sodium-ion battery electrolyte as the core, combines classical molecular dynamics, ab initio molecular dynamics, density functional theory, and studies the steady-state ion hydration cell configuration of electrolyte under different concentrations by multi-scale simulation and screens its desolvation path, to provide theoretical guidance for high-performance aqueous sodium-ion electrolyte design.

This invention belongs to the field of sodium-ion battery technology, specifically relating to a negative electrode material based on hydroxyl-containing carbohydrates, a negative electrode, a battery, and a preparation method. The negative electrode material based on hydroxyl-containing carbohydrates is obtained by pre-oxidizing hydroxyl-containing carbohydrates at 250℃~350℃ for 3h~4h, grinding, and carbonizing in an inert atmosphere; the hard carbon powder exhibits a three-dimensional network structure containing closed pores. The pre-oxidation cross-linking forms a three-dimensional network structure, creating some closed pores within, thus enabling the material to exhibit high first-cycle coulombic efficiency and ultra-high plateau capacity.

This invention discloses an O3-phase high-entropy layered oxide cathode material, its preparation method, and its application, belonging to the technical field of sodium-ion battery cathode materials. The O3-phase high-entropy layered oxide cathode material has the chemical formula NaNi. 1‑ 8x Ca x Co x Al x Fe x Mn x Si x Ti x Zr x O2, x = 0.05~0.1. Raw materials are weighed according to stoichiometric ratio, mixed, and pulverized to obtain precursor powder. The precursor powder is then sintered in a pure oxygen atmosphere to obtain a first sintered product, which is then pulverized again. The pulverized product is then sintered in a pure oxygen atmosphere for a second step, and after cooling, an O3 phase high-entropy layered oxide cathode material is obtained. Sodium-ion batteries assembled based on this cathode material exhibit excellent high-rate performance and long-cycle stability.

The utility model discloses a kind of ventilation structure of sodium ion battery, belong to sodium ion battery technical field, including battery shell and battery cover, the movable joint has cap on the battery cover, gas-permeable membrane and sealing ring are equipped between the cap and battery cover, the sidewall of the cap is connected with multiple second clamping pieces, the sidewall of the battery cover is opened with multiple second clamping grooves, and multiple second clamping pieces are opposite with multiple second clamping grooves, multiple accommodating grooves are opened on the sidewall of the cap;Through the cooperation between above each device, cap is clamped on battery cover, when removing cap, cap stress will pull second clamping piece and be deformed, accommodating groove reserves space for the deformation of second clamping piece, can remove cap from battery cover, it is convenient to replace gas-permeable membrane and sealing ring, then battery cover is clamped on battery shell by first clamping piece, by pushing push block, the limiting of first clamping piece to battery cover can be removed, and battery cover is opened.

The application discloses a kind of surface chemical reconfiguration's sodium ion battery hard carbon negative electrode material and preparation method thereof.The method comprises the following steps: constructing organic precursor layer on the surface of carbon source matrix;Using acid dehydrating agent to induce the dehydration, crosslinking or aromatization reaction of precursor layer at 0-300 DEG C, to form stable surface solidification layer;Finally, high-temperature carbonization is obtained hard carbon material.The application utilizes acid-assisted solidification technology, significantly reduces the content of active oxygen-containing functional groups on the surface of hard carbon (XPS shows <5.0%), while maintaining the internal microporous sodium storage capacity, significantly improves the interface stability and the first coulomb efficiency of the material (can reach more than 95%).The process is simple, low in cost, and suitable for large-scale industrial production.

The application relates to the technical field of sodium ion batteries, in particular to a battery negative electrode coal-based hard carbon material and a preparation method and application thereof. Through one-step oxidation molten salt method, Na2O2 is used as an oxidant, Na2CO3 generated by the reaction of Na2O2 and CO2 in the pre-oxidation process can be used as a cosolvent of the molten salt method, and the utilization rate of raw materials is improved. Moreover, the reaction of Na2O2 and CO2 generates O2, which is more conducive to forming C-O-C bridging bonds, controlling the yield of O2, and forming microporous channels; the obtained hard carbon material has a wider interlayer spacing of microcrystals and a larger sodium storage capacity, the reversible specific capacity is greater than 300 mAh / g, the first charge-discharge coulombic efficiency is high, and excellent sodium storage performance is exhibited; and a sodium ion battery with high energy density, long cycle life, excellent rate performance and lower cost can be obtained.

The application relates to F, N co-doped low-sulfur sodium iron pyrophosphate phosphate and a preparation method and application thereof, and belongs to the technical field of sodium ion battery materials, and at least one of the problems of poor rate performance and short cycle life of an existing sodium ion battery is solved. The preparation method comprises the following steps: S1, dissolving a sulfur-free iron source, a sulfur-free sodium source and a phosphorus source in deionized water, stirring and mixing to obtain a mixed solution; S2, adding a complex carbon source and a conventional carbon source into the mixed solution, and performing heating and stirring to obtain a precursor product, wherein the complex carbon source contains F and N; S3, drying the precursor product to obtain a sodium iron pyrophosphate phosphate precursor; and S4, sintering the sodium iron pyrophosphate phosphate precursor to obtain F, N co-doped low-sulfur sodium iron pyrophosphate phosphate. The sodium iron pyrophosphate phosphate positive electrode material has a carbon coating layer, N elements are doped in the carbon coating layer, and F elements are doped in the sodium iron pyrophosphate phosphate, so that the rate performance and the cycle life of the material are improved.

The application provides a positive electrode sheet, a battery, a battery pack and an electric device for a sodium ion battery, which comprises a positive electrode current collector and a positive electrode active material layer on at least one side of the positive electrode current collector, wherein the positive electrode coating layer contains a polyanionic positive electrode material, the cross-sectional porosity of the polyanionic positive electrode material is 1%-60%, the specific surface area of the polyanionic positive electrode material is denoted as S m 2 / g, 1.5≤S≤30, the volume particle size distribution (D90-D10) / D50 of the polyanionic positive electrode material is denoted as K, 0.6≤K≤4, and 5≤S*K≤60. By using the polyanionic positive electrode material satisfying the above characteristics, the stability of the positive electrode slurry formed by the positive electrode material can be improved, the viscosity of the positive electrode slurry can be reduced, the gel of the positive electrode slurry can be reduced, the coating uniformity of the positive electrode slurry on the current collector can be improved, the uniformity of the positive electrode active material layer can be improved, so that the compaction density of the positive electrode sheet is improved, and then the volume energy density and the gram capacity of the battery are improved.

The application discloses a kind of precursor of sodium ion battery positive electrode material and its preparation method and application, belong to sodium ion battery technical field, the application first uses AB2O4 (A=Ni, Mg, Cu, B=Fe, Mn) This spinel material as the precursor of sodium ion battery layered positive electrode, and using the precursor has prepared layered positive electrode material.The precursor is prepared by high-temperature solid-phase method and molten salt method, the precursor obtained has the morphology of spheroid or octahedron;The precursor is mixed with sodium source, and the positive electrode material is obtained by high-temperature sintering in air or oxygen atmosphere, the morphology of precursor is retained, and the compaction density, cycle performance and rate performance of positive electrode material are significantly improved.

The application discloses a preparation method of a pitch-based sodium ion battery hard carbon negative material, and comprises the following steps: S1, pretreatment: crushing and sieving pitch raw materials to obtain pitch powder; S2, raw material mixing: uniformly mixing the pitch powder, an oxygen supplier, a catalyst and a stabilizer to form a uniform raw material mixture; S3, oxidation reaction: performing oxidation reaction on the raw material mixture obtained in the step S2 to obtain oxidized pitch; S4, acid washing treatment: washing the oxidized pitch obtained in the step S3 in an acid solution, and then performing centrifugation, water washing and drying to obtain purified oxidized pitch; and S5, high-temperature sintering: performing high-temperature sintering on the purified oxidized pitch obtained in the step S4 in a protective atmosphere to obtain a high-performance hard carbon negative material. The preparation method of the pitch-based sodium ion battery hard carbon negative material is characterized by good uniformity, high sodium storage capacity and low cost.

This invention discloses an aqueous sodium-ion battery negative electrode, comprising: a negative electrode sheet or a negative electrode current collector, the negative electrode sheet comprising a negative electrode active material; and a ZnS layer comprising ZnS, the ZnS layer being disposed on at least a portion of the surface of the negative electrode sheet or the negative electrode current collector. This invention adds a ZnS layer to the surface of the battery negative electrode to achieve protection of the negative electrode, effectively suppressing dendrite growth and volume expansion, and improving the cycle stability of the battery under high current density.

This application relates to the field of battery technology, and particularly to a negative electrode-free sodium-ion battery, its current collector, and its preparation method. The current collector includes a current collector body and a porous compound modification layer located on at least one side surface of the current collector body. The porous compound modification layer includes multiple pore structures of mesopore size, and the exposed surface of the porous compound modification layer has sodium-affinity sites. The surface of the pore structure serves as an interface for sodium ion deposition and stripping. This application can significantly improve the electrical performance of the negative electrode-free sodium-ion battery.

The application relates to the field of sodium ion batteries, in particular to a high-voltage sodium ion battery positive electrode material and a preparation method thereof. The structural general formula of the high-voltage sodium ion battery positive electrode material is Na a A b [Ni c Fe d Mn e M f ]O2, wherein A is one or more of Li, Na, Mg, K, Ca or Zn, and M is one or more of Li, Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Zr, Nb, Mo, Sn, Sb or Ta. The positive electrode material is simultaneously modified by sodium site and transition metal site double doping, supports a highly desodiated sodium layer and a stable transition metal layer under high voltage, has a relatively high discharge specific capacity and a high cut-off voltage cycle stability, and maintains the integrity of the positive electrode particles after charging and discharging cycles. Moreover, the preparation process is simple and has a commercial prospect.

A feature selection and data preprocessing method for estimating the state of health (SOH) of sodium-ion batteries includes the following steps: (1) collecting raw monitoring data of sodium-ion batteries during charge-discharge cycles; (2) performing Hampel filtering on each feature parameter in the raw monitoring data to obtain cleaned data; (3) calculating the Spearman correlation coefficient between each feature parameter and battery capacity in the cleaned data to obtain a correlation coefficient matrix; (4) selecting features whose absolute value of the correlation coefficient with battery capacity is greater than a first preset threshold as candidate features; (5) calculating the Spearman correlation coefficient between candidate features and retaining representative features; (6) using the selected features as input for training the subsequent SOH estimation model of sodium-ion batteries. This method is highly versatile and applicable not only to sodium-ion batteries but also to the health status estimation of other types of batteries.

The application discloses a bamboo-based hard carbon negative electrode material and a preparation method and application thereof, and belongs to the field of sodium ion battery materials. Bamboo is used as raw material, and after washing and crushing, a precursor of the hard carbon is prepared by using cellulase treatment, and the bamboo-based hard carbon negative electrode material is obtained by high-temperature carbonization after washing and drying. The content of cellulose in the bamboo and the crystalline structure of the cellulose are adjusted by the cellulase treatment, which is beneficial to the formation of the closed pore structure after high-temperature carbonization, and can effectively improve the initial coulombic efficiency and reversible capacity of the hard carbon negative electrode material. The performance of the obtained bamboo-based hard carbon negative electrode material is equivalent to that of the commercially available hard carbon, and can even exceed the performance of the commercially available hard carbon. The raw material used in the application is a biomass resource, which is green and renewable. The preparation method is a biological method, which is environmentally friendly and simple, and can be industrialized.

The application discloses a surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material and a preparation method and a sodium ion battery thereof, and belongs to the technical field of sodium ion batteries. The sodium ion battery positive electrode material comprises a layered transition metal oxide and a coating layer coated on the surface of the layered transition metal oxide; the layered transition metal oxide is a nickel-iron-manganese-based layered transition metal oxide, and the coating layer is an amorphous boron oxide coating layer; the chemical formula of the surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material is Na(Ni 1 / 3 Fe 1 / 3 Mn 1 / 3 ) x B y M z O2, 0.9≤x≤0.98, 0.01≤y<0.2, 0.01≤z<0.1, and x+y+z=1, and M is selected from W or Nb; wherein the doping concentration of boron elements and metal M elements presents a gradient decreasing trend from the surface layer to the inside along the radial direction; the surface boron oxide coating and the bulk-gradient doping of boron elements and metal M elements are simultaneously realized; the surface coating layer effectively reduces the interface side reaction, and the bulk-gradient doping stabilizes the crystal structure from the inside; and the two synergistically act to jointly inhibit the structural degradation in the cycle process.

This invention discloses a digital twin multi-field coupled sodium mobile power station air-cooled thermal management system and control method, belonging to the field of electrochemical energy storage thermal management. Addressing the problems of easy leakage in liquid cooling schemes and the inability of traditional air cooling to adapt to deformation under vibration conditions in mobile power stations, this invention proposes using sodium-ion batteries without configuring liquid cooling pipelines. A reduced-order digital twin model based on intrinsic orthogonal decomposition and Galerkin projection is constructed to reconstruct the flow and temperature fields in real time. Microscopic deformation of the air duct is estimated using an inertial measurement unit and extended Kalman filter, combined with Grassmann manifold interpolation for online compensation of the model. A physically constrained LSTM-XGBoost hybrid model is used to predict hotspots, and model predictive control is employed to collaboratively optimize multi-zone variable frequency fans, active air guide louvers, and dynamic spoilers. This invention achieves efficient temperature control and thermal safety early warning for the air-cooled system under vibration conditions, improves temperature consistency, and reduces system complexity and maintenance costs.

This utility model belongs to the field of electrical component technology, specifically relating to a sodium-ion battery structure and battery pack. The sodium-ion battery structure includes a battery pack comprising a plurality of batteries arranged in an array, each battery being surrounded by a support sleeve. An upper limit cover is provided above the battery pack, and a lower limit cover is provided below the battery pack. Thermally conductive adhesive is filled between the support sleeves. Both the upper and lower limit covers have a plurality of first limiting grooves. When replacing the battery, the battery is removed from the support sleeve by removing the upper limit cover. This sodium-ion battery structure and battery pack, by using support sleeves, ensures that the thermally conductive adhesive adheres to each support sleeve, avoiding direct contact and adhesion between the battery and the thermally conductive adhesive. That is, when replacing the battery, only the upper limit cover needs to be removed first, and then the battery can be removed from the support sleeve to complete the replacement, eliminating the need to melt the thermally conductive adhesive, greatly improving the convenience of operation.

The utility model discloses a kind of sodium ion battery processing electrolyte filling mechanism, including workbench and liquid storage tank, the upper surface of the liquid storage tank is fixedly installed on workbench, the upper surface of the liquid storage tank is connected with liquid inlet pipe, the upper surface of the workbench is fixedly installed with liquid pump, the water inlet of the liquid pump is fixedly installed with liquid suction pipe, the bottom end of the liquid suction pipe is connected with the bottom of liquid storage tank, the water outlet of the liquid pump is fixedly installed with liquid pipe.The utility model, by being set up the cooperation of workbench, liquid storage tank, liquid pump, liquid suction pipe, liquid pipe, valve, extension pipe, liquid storage grid, liquid outlet pipe and liquid outlet head component, the function of replacing liquid outlet head quickly and conveniently is realized, the installation mode of the liquid outlet head in existing device is improved, so that when liquid outlet head is blocked or damaged, liquid outlet head can be quickly replaced, the processing efficiency of sodium ion battery is improved.

The present disclosure relates to the technical field of sodium ion battery negative electrode materials, in particular to a preparation and purification process of a biomass hard carbon material for sodium ion battery negative electrodes and application. The preparation and purification process comprises the following steps: providing biomass carbonization material, preparing a first mixed acid solution comprising nitric acid, hydrochloric acid and hydrofluoric acid, and performing first acid washing; then preparing a second mixed acid solution comprising organic acid, chelating agent and surfactant; performing second acid washing; then performing a ball milling process together with the second mixed acid solution; and finally calcining under a nitrogen atmosphere to obtain a biomass hard carbon material for sodium ion battery negative electrodes.