15 results about "Potassium-ion battery" patented technology

This invention discloses a SnS / WS2@C composite electrode material, its preparation method, and its application, belonging to the field of tungsten disulfide nanomaterials technology. A precursor solution A is obtained by uniformly dispersing SnCl2·2H2O and CH3CSNH2 in anhydrous ethanol. After a solvothermal reaction, precursor solution A is cooled, centrifuged, washed, and freeze-dried to obtain powder B. Powder B, WCl6, and CH3CSNH2 are uniformly dispersed in anhydrous ethanol to obtain solution C. After a solvothermal reaction, solution C is cooled, centrifuged, washed, and freeze-dried to obtain powder D. Powder D is uniformly dispersed with glucose in deionized water to obtain precursor solution E. After a solvothermal reaction, precursor solution E is cooled, centrifuged, washed, and freeze-dried to obtain powder F. Powder F is calcined at high temperature to obtain the SnS / WS2@C composite electrode material. Performance testing of the prepared SnS / WS2@C composite electrode material revealed that it exhibits good electrochemical performance when used as a negative electrode in potassium-ion batteries.

This invention discloses a molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material and its preparation method. The preparation method includes the following steps: (1) preparing polyaniline hollow spheres using aniline, hydrogen peroxide, anhydrous ferric chloride, and phosphoric acid aqueous solution as raw materials via a hydrothermal method; (2) immersing the polyaniline hollow spheres in concentrated hydrochloric acid, drying them, and then performing a secondary hydrothermal treatment with ammonium molybdate tetrahydrate and ammonium dihydrogen phosphate to obtain a precursor; (3) further carbonizing and phosphating the precursor with sodium hypophosphite monohydrate to obtain the molybdenum phosphide quantum dot-embedded polyaniline-derived hollow sphere hard carbon composite material. In this composite material, molybdenum phosphide is embedded in the hard carbon wall of polyaniline hollow spheres with a diameter of 200-300 nm in the form of 2-3 nm quantum dots, accounting for approximately 20-25 wt% by mass. The composite material provided by this invention can be used as an electrode material, and the potassium-ion batteries prepared from it have high specific capacity, good cycle stability, and excellent rate performance. Furthermore, the method provided by this invention has the advantages of simple process, low cost, and large-scale production capability.

This invention discloses a hollow tubular ternary tin-selenium-sulfur composite carbon anode material, its preparation method, and its application. The hollow tubular wall of the hollow tubular ternary tin-selenium-sulfur composite carbon anode material is made of SnSe. 0.5 S 0.5 Constructed from nanocrystals, polyvinylpyrrolidone is carbonized and coated onto hollow tubular SnSe. 0.5 S 0.5 The inner and outer wall surfaces. Prepared according to the following steps: First, prepare pure phase SnSe. 0.5 S 0.5 Nanocrystals; based on pure-phase SnSe 0.5 S 0.5 Nanocrystals, SnSe prepared by electrospinning 0.5 S 0.5 @PVP nanofibers; then SnSe 0.5 S 0.5 Hollow tubular ternary tin-selenium-sulfur composite carbon anode material was prepared by pre-oxidation and calcination of PVP nanofibers. This material is used in the fabrication of lithium-ion, sodium-ion, and potassium-ion batteries, exhibiting good cycle stability.

This invention discloses a method for preparing nitrogen-doped carbon nanotubes (NCNTs) composite KVPO4F microspheres and their applications. The method involves: preparing a VOHPO4 / NCNTs composite precursor by reflux and self-assembly; reducing VOHPO4 / NCNTs in a hydrogen / argon atmosphere; ultrasonically dispersing the reduction product with KF in solution, evaporating the solvent to achieve uniform mixing; and calcining the mixture in an argon atmosphere to obtain the final product. This invention features a novel process, and the resulting KVPO4F / NCNTs material exhibits excellent electrochemical performance, making it a promising cathode material for potassium-ion batteries.

The application discloses an amorphous CoSe2 / C negative electrode material and a preparation method and application thereof, and belongs to the technical field of negative electrode materials. Co(NO3)2 6H2O and polyacrylonitrile are used as raw materials to prepare a precursor solution and perform electrostatic spinning to form a fiber membrane; subsequently, the fiber membrane is sequentially subjected to pre-oxidation and high-temperature carbonization treatment to obtain a Co / C composite material; the Co / C composite material is subjected to selenization treatment with Se powder to obtain a CoSe2 / C composite material; and the CoSe2 / C is subjected to heating reaction to obtain the amorphous CoSe2 / C negative electrode material. The amorphous CoSe2 / C composite material is used as a negative electrode of a potassium ion battery, reaction kinetics is improved, volume strain can be effectively buffered, particle rupture and electrode pulverization can be prevented, amorphization treatment is performed in the preparation steps, more defects and active sites are provided through a disordered structure, and the structural stability is enhanced.

The application relates to a one-step method for preparing metal sulfide ultrathin nanosheets and application, which comprises the following steps: step one: uniformly mixing a metal salt, a salt template agent and thiourea in ethanol to obtain a precursor mixed liquid; step two: performing heating and drying on the precursor mixed liquid to obtain a precursor powder; step three: performing heat treatment on the dried precursor powder; and step four: soaking the heat-treated precursor powder in deionized water, and then performing cleaning and drying to obtain a metal powder, namely the metal sulfide ultrathin nanosheet. The method for preparing the metal sulfide ultrathin nanosheet provided by the application does not need to additionally introduce a sulfur source, is simple and easy to operate, has low cost, and the obtained metal sulfide two-dimensional ultrathin nanosheet has uniform morphology, can provide a larger specific surface area, abundant energy storage sites and a shorter diffusion distance, and has great application prospects in the field of alkali metal ion batteries-potassium ion batteries.

This invention relates to the field of secondary battery chemical energy storage technology, and particularly to a potassium-ion battery anode, a potassium-ion battery, its preparation method, and its applications. The invention includes the following steps: providing a bismuth-tin metal-organic framework precursor; mixing the bismuth-tin metal-organic framework precursor with a carbon source to obtain a composite precursor; and calcining the composite precursor under an inert atmosphere to induce a carbothermic reduction reaction, yielding a bismuth-tin dimer with a phase-separated structure, which is then coated with carbon to form a potassium-ion battery anode material. The anode material prepared by this invention can be widely used in high-performance potassium-ion batteries, especially suitable for large-scale energy storage, portable electronic devices, electric vehicles, and other fields, meeting the application requirements of different scenarios and possessing strong practicality and broad application prospects.

The purpose of this invention is to provide a method for synthesizing biomass carbon materials by electrospinning and their application in sodium-ion batteries. The electrospinning process utilizes electrospinning to obtain highly conductive and structurally uniform biomass-based carbon nanofiber electrode materials. When used as a negative electrode material in sodium-ion batteries, it exhibits excellent cycling performance (a capacity of 278.5 mAh·g after 200 cycles at 0.1 A / g). ‑1 (above) and good rate performance (capacity of 135.6 mAh·g at 2A / g). ‑1 (Above). This invention solves the problems of poor structural controllability and unsatisfactory performance in the preparation of existing biomass carbon materials, and also addresses the shortcomings of high cost and insufficient electrochemical performance of existing sodium-ion battery electrode materials. It enables the green, efficient, and large-scale synthesis of biomass carbon materials and their efficient application in sodium-ion batteries. This invention provides a new approach for the application of high-performance biomass hard carbon materials as anode materials in sodium-ion batteries.

This application provides a two-dimensional VOPO4 material with adjustable interlayer spacing, its preparation method, and its applications. Addressing the problems of insufficient reversible capacity, poor rate performance, and structural degradation during cycling of existing two-dimensional layered VOPO4 materials as anodes in potassium-ion batteries, this application provides a solution for intercalation modification of VOPO4 materials. Specifically, the two-dimensional VOPO4 material is a two-dimensional VOPO4 nanosheet modified by intercalation with aniline derivatives. The aniline derivatives are intercalated into the interlayer spaces of VOPO4, resulting in an interlayer spacing of 15.8 Å–20.9 Å. By pre-inserting aniline derivatives of specific molecular sizes into the interlayer spaces of VOPO4, expanded two-dimensional VOPO4 nanosheets with adjustable interlayer spacing are formed. The expanded interlayer space provides more spacious channels and more active sites for potassium ion transport, thereby improving ion diffusion kinetics and structural stability.

Disclosed in the present application is a preparation method for a low-disorder expanded π-conjugated organic material. In the present application, commercial tetraaminobenzoquinone is used as a synthetic monomer, a hydrochloric acid solution is added, ultrasonic dispersion is performed, and sodium acetate is then added to obtain a turbid solution II; then, the turbid solution II is heated and stirred in flowing oxygen, and is then washed and dried; the resulting powder is put into dimethyl sulfoxide to obtain a turbid solution III; and then, the turbid solution III is subjected to aeration drying at a high temperature, and is then washed with ethanol, filtered, and dried in vacuum, so as to obtain a low-disorder expanded π-conjugated organic material. The organic material of the present application can expose more active sites and has a more open framework structure, such that the diffusion paths of potassium ions are reduced, the capacity and rate capability of TAPT can be significantly improved, and the problem of the capacity, the cycling stability and the ionic conductivity being difficult to improve at the same time when the organic electrode material is applied to a potassium-ion battery is solved. The preparation method of the present application has high cost efficiency, is simple, convenient and environment-friendly in terms of the preparation process, and is suitable for a wide range of applications. The organic material has good electrochemical performance.

The application discloses a high-capacity resin-based hard carbon material and a preparation method and application thereof, and the method for preparing the hard carbon material effectively avoids flammable gas risks, is safe and controllable in process, has the advantages of low cost and high efficiency, and is suitable for large-scale industrial application. The high-capacity resin-based hard carbon material prepared by the application has excellent lithium / sodium / potassium storage performance, and provides a new technical path for the development of lithium / sodium / potassium ion battery negative materials. The high-capacity resin-based hard carbon material prepared based on a liquid phase sealing technology utilizes the flow characteristics of liquid resin material before curing to uniformly coat the surface of selected activated carbon material, and converts the open pore structure of the activated carbon material into a closed pore structure. The method replaces the traditional gas phase sealing technology, avoids the safety risks of flammable gas carbon sources, is simple and controllable in process, and is easy to scale up production; and the treatment in a reducing atmosphere is selective, and can further optimize surface defects, improve the first coulomb efficiency and cycle stability.

The application provides a method for preparing a low-cost positive electrode material of a potassium ion battery by using iron elements, and belongs to the field of new energy materials.The specific implementation steps of the method are as follows: (1) performing solvent thermal treatment on raw material powder; (2) performing pre-calcination on the powder obtained in step 1; (3) performing tabletting treatment on the product obtained in step (2); and (4) performing high-temperature calcination on the product obtained in step (3).The positive electrode material prepared by the method has a non-layered structure, and has the advantages of simple process, low cost and suitability for large-scale production, and the electrochemical performance of the positive electrode material applied to the potassium ion battery has great research value.

The present invention discloses a high-entropy Prussian blue HEPBA cathode material for aqueous potassium-ion batteries, its preparation method and application, belonging to the technical field of electrochemical energy storage. The cathode material of the aqueous potassium-ion battery in the present invention is a high-entropy Prussian blue HEPBA active substance powder, which has a cubic structure and an average particle size of 100-200 nm; the chemical composition is K x Co a Ni b Cu c Mn d Zn e [Fe(CN)6] y □ 1‑y ·zH2O, where □ represents the [Fe(CN)6] vacancy, 1 < x < 2, 0.8 < y < 1, 0.1 < z < 2, 0.1 ≤ a ≤ 0.35, 0.1 ≤ b ≤ 0.35, 0.1 ≤ c ≤ 0.35, 0.1 ≤ d ≤ 0.35, 0.1 ≤ e ≤ 0.35, and a + b + c + d + e = 1. Mixing this cathode material with a conductive agent and a binder to form a slurry, coating it on the surface of a hydrophilic current collector to obtain a cathode electrode sheet, and applying it to an aqueous potassium-ion battery, not only shows a specific capacity as high as 140 mAh g ‑1 , but also has a stable structure in the aqueous electrolyte, demonstrating good application potential.