15results about How to "High discharge specific capacity" patented technology

This invention belongs to the technical field of lithium-ion battery cathode materials, specifically relating to a sulfonic acid-based organic polymer, a sulfonic acid-based organic polymer / carbon nanotube composite material, its preparation method, and its application. The sulfonic acid-based organic polymer is prepared by a dehydration condensation reaction of 2,5-diaminobenzenesulfonic acid and hexaazabenzophenanthrene hexacarboxylic acid trianal. When used as a lithium-ion battery cathode material, it exhibits high specific capacity and excellent cycle stability, overcoming the solubility problem of organic cathode materials in electrolytes. When the sulfonic acid-based organic polymer is combined with carbon nanotubes and applied to lithium-ion battery cathode materials, battery performance is significantly improved, and the capacity remains stable even after long-term cycling. The synthesis methods of the sulfonic acid-based organic polymer and the sulfonic acid-based organic polymer / carbon nanotube composite material of this invention are simple, have abundant raw material sources, and good reproducibility, making them suitable for industrial production and possessing broad application prospects in the field of lithium-ion batteries.

A method for the synergistic lithium and phosphorus supplementation and targeted regeneration of lithium iron phosphate (LFP) cathode materials is disclosed, involving a regeneration and repair method for retired LFP cathode materials. This method aims to address the technical problems of poor uniformity, poor electrochemical performance, and poor safety associated with existing direct regeneration methods for retired LFP cathode materials. The method comprises: 1. Cathode material stripping and crushing; 2. Preparation of an aqueous repair solution using a reducing agent, lithium salt, and phytic acid; reaction of the degraded LFP black powder in the repair solution; filtration, drying, and segmented sintering to completely reconstruct the material's intact crystal structure and coat it with a highly conductive carbon layer. The regenerated LFP cathode material exhibits a discharge specific capacity of up to 149.7 mAh g⁻¹ at a current density of 1 C. ‑ ¹, and it is cycle-stable, making it suitable for use in the battery industry.

The invention relates to guanidine-containing hydrobromide electrolyte for a high-energy-density zinc-bromine-iodine battery as well as a preparation method and application of the guanidine-containing hydrobromide electrolyte, and belongs to the technical field of aqueous zinc-bromine-iodine batteries. The guanidine hydrobromide-containing electrolyte for the high-energy-density zinc-bromine-iodine battery comprises guanidine hydrobromide, zinc salt and deionized water. According to the guanidine-containing hydrobromide electrolyte for the high-energy-density zinc-bromine-iodine battery, provided by the invention, redox of iodine valence state I-I0I < + > and redox of bromine valence state BrBr0 can be realized at the same time, and six-electron transfer of halogen compounds in the zinc-bromine-iodine battery is realized. On one hand, the energy density of the battery is increased to 3-4 times of the initial value, and on the other hand, the zinc-bromine-iodine battery containing the zinc-bromine-iodine battery has the advantages of being easy to manufacture and easy to industrially popularize.

The invention relates to an iodine-containing acetonitrile electrolyte for a high-energy-density battery as well as a preparation method and application of the iodine-containing acetonitrile electrolyte, and belongs to the technical field of aqueous zinc-iodine batteries. The iodine-containing acetonitrile electrolyte for the high-energy density battery comprises a zinc salt, iodine acetonitrile and deionized water. Compared with a traditional zinc-iodine battery which only depends on iodine positive electrode oxidation reduction, the battery prepared from the iodine-containing acetonitrile electrolyte for the high-energy-density battery in the invention has the advantages that the iodine-containing acetonitrile electrolyte for the high-energy-density battery can be subjected to auto-oxidation reduction in the charging and discharging process, and the multi-iodide shuttle effect is reduced; therefore, the corrosion to the negative electrode is reduced and the battery capacity is remarkably improved. In addition, different from a multi-electron transfer type high-energy-density zinc ion battery, the iodoacetonitrile does not provide an additional redox platform, but enhances the I-I0 reaction through a special channel of self-redox of an electrolyte medium.

This invention discloses a graded lithium iron phosphate material and its preparation method, belonging to the field of positive electrode active materials for lithium-ion batteries. The method involves preparing two types of iron phosphate using a co-precipitation method, with at least one type being a doped iron phosphate. The two types of iron phosphate are coarsely ground and mixed in deionized water or methanol to obtain a uniform iron phosphate slurry. A lithium source, carbon source, and additives are added to the iron phosphate slurry, along with deionized water or methanol, and the mixture is finely ground and mixed to obtain a uniform mixed slurry. The mixed slurry is granulated using a spray granulation device to obtain a dry powder. Under nitrogen protection, the powder is sintered in a kiln, and the sintered material is obtained after furnace cooling. The sintered material is then crushed, graded, and sieved to obtain the graded lithium iron phosphate material. The lithium iron phosphate material prepared by this invention can be used as a positive electrode active material for automotive power lithium batteries, providing better power performance.

This invention discloses a preparation method and application for improving the fast-charging performance of graphite composite materials. The preparation method involves mixing a graphite precursor with a catalyst and a conductive liquid, ball milling the mixture, followed by pre-carbonization, low-temperature graphitization, and acid washing to obtain a graphite precursor material. Then, the graphite precursor is mixed with a heteroatom polymer, a phosphorus compound, and an organotitanium compound, and heat-treated to obtain the graphite composite material. The graphite composite material prepared by this invention utilizes a catalyst to enhance the anisotropy of carbon during graphitization, and improves electronic conductivity through the conductive agent doped into the core. The titanium dioxide coating on the composite material's outer shell has the characteristics of large interlayer spacing, low expansion rate, and structural stability, which improves the lithium-ion insertion / extraction rate and rate performance. Since phosphorus itself has high specific capacity and a high voltage plateau, phosphorus doping improves the specific capacity and voltage plateau of the composite material, thus enhancing its fast-charging performance.

The invention discloses a high-nickel ternary positive electrode material and a preparation method and application thereof, and belongs to the technical field of batteries and battery materials, a coating layer is formed on the surface of the high-nickel ternary positive electrode material through silicon dioxide, direct contact between an electrode material and an electrolyte is effectively isolated, and then through a thiol-ene click reaction, the high-nickel ternary positive electrode material is obtained. The graphene / titanium dioxide core-shell whisker is used as a reinforcing phase to coat the surface of the silicon dioxide coating layer again, so that the interface bonding force between the two coating layers is increased, the volume change caused by lithium ion intercalation and deintercalation can be coped, the structural stability of the material is kept, and the specific discharge capacity, the capacity retention rate and the cycling stability are favorably improved; according to the graphene / titanium dioxide core-shell whisker, titanium dioxide containing whiskers is synthesized on the surface of graphene containing a lamellar structure through microwave heating and serves as a core layer, then a shell-structure lanthanum metal framework is synthesized in a hydro-thermal mode, and the interface bonding force can be further improved through the mechanical interlocking effect.

This application belongs to the field of lithium-ion battery technology, and specifically discloses an air-stable solid electrolyte. The solid electrolyte includes a core and a hydrophobic layer coating the surface of the core. The core comprises sulfide particles, and the thickness of the hydrophobic layer is 5–30 nm. The solid electrolyte according to the embodiments of this application has a surface-coated hydrophobic layer with low surface activity, exhibiting strong air stability and enabling the fabrication of solid-state batteries with excellent battery performance.

This invention discloses a manganese-based crystalline oxide cathode material for sodium-ion batteries with high-voltage and long-cycle resistance, and its preparation method, belonging to the field of sodium battery material technology. The chemical formula of the manganese-based crystalline oxide cathode material for sodium-ion batteries with high-voltage and long-cycle resistance is Na. x A y B z Mn (1‑y‑z) O2, 0 < x ≤ 1, 0.1 ≤ y ≤ 0.3, 0 < z < 0.9, A is at least one of Li, Mg, Zn, Cu and vacancy (□), B is an element with strong covalent affinity to oxygen. The preparation method used in this invention is a solid-state reaction method, which is simple to operate, easy to control, has a short process flow, and is easy to industrialize. The cathode material provided by this invention can realize electron transfer from Mn to Zn based on the difference in electronegativity between elements. 3+ Transfer to B (MMCT) significantly reduces Mn after electrode cycling. 3+ The content of Mn. Cathode materials with the MMCT mechanism significantly inhibited Mn content. 3+ The Ginger-Taylor distortion exhibits higher crystal structure stability and superior high pressure resistance and cyclic stability.

This invention discloses an aqueous zinc-bromine static battery positive electrode sheet, its preparation method, and the aqueous static zinc-bromine battery, relating to the field of electrochemical energy storage technology. The aqueous zinc-bromine static battery positive electrode sheet includes a positive electrode current collector and a positive electrode material layer disposed on the surface of the current collector. The positive electrode material layer includes a positive electrode material, which comprises a carrier, a conductive agent, a binder, and a bromide salt. Preparation method: The carrier, conductive agent, and binder are mixed and slurried, coated onto the positive electrode current collector, and dried to form a carbon-containing positive electrode carrier. Subsequently, a bromide salt solution is loaded, and after static reaction, the product is obtained. This invention utilizes the dual effects of the physical adsorption of activated carbon and the chemical bonding of the cations of the ionic liquid bromide salt to efficiently and stably immobilize the bromine active material within the positive electrode, significantly suppressing the bromine shuttle effect. This preparation process is simple and low-cost. The assembled static zinc-bromine battery exhibits high specific capacity, excellent rate performance, and cycle stability, making it suitable for large-scale energy storage applications.

The application discloses a kind of nitrogen-doped artificial graphite negative electrode materials and preparation method and application thereof, steps include: the raw material coke is pretreated, and artificial graphite is obtained by graphitization;Artificial graphite is compounded with nitrogen source under alkaline conditions, and calcination, and the negative electrode material is obtained.This unique preparation method can introduce nitrogen element into artificial graphite, and this introduction makes the molecular structure of the ink sheet change, and enhances the contact between layers.Compared with the lithium ion battery in the past, the lithium ion battery containing this nitrogen-doped artificial graphite negative electrode material improves the discharge specific capacity while significantly prolonging the cycle life.

This invention belongs to the field of lithium-ion battery cathode material synthesis, and relates to redox-active organic polymer materials, their preparation methods, and applications. N,N-diamino-1,4,5,8-naphthalenetetraimide is subjected to a dehydration condensation reaction with hexaazabenzphenanthrene hexacarboxylic acid trianal. After the reaction, the mixture is washed with deionized water, centrifuged, and vacuum dried to obtain a redox-active organic polymer. Button-type lithium-ion batteries prepared using this polymer as a cathode material exhibit high specific capacity, good rate performance, and excellent cycle stability. Therefore, this type of organic polymer material has broad application prospects in the field of lithium-ion batteries. The synthesis method of the material in this invention is simple, the raw materials are abundant, and the reproducibility is good, making it suitable for industrial production.

This invention relates to the field of calcium-ion battery technology, specifically to an electrochemical activation method for PTCDI electrode material, which includes the following steps: (1) placing a 0.5M CaCl2 aqueous solution as the electrolyte in an electrolytic cell; (2) preparing a slurry from PTCDI, super P and Nafion film solutions, and coating the prepared slurry onto a carbon fiber paper substrate; (3) thoroughly drying the carbon fiber paper electrode coated with the slurry to obtain an electrode sheet; (4) placing the obtained electrode sheet in the electrolyte for electrochemical activation, and finally obtaining a calcium-ion battery negative electrode; (5) conducting electrochemical performance tests on the PTCDI negative electrode material. The electrochemical activation method for PTCDI electrode material of this invention can effectively increase the wettability between the PTCDI electrode and the electrolyte, and effectively improve its discharge specific capacity.

This invention provides a self-grown nitrogen-doped carbon nanotube composite material based on a MOF template. The composite material uses a cobalt salt as the metal center and an organic compound as the ligand to synthesize a metal-organic framework template, followed by the autocatalytic generation of nitrogen-doped carbon nanotubes under an inert atmosphere. The preparation method includes: first, preparing a MOF template using a cobalt salt and organic ligand; then, introducing a nickel source onto the template surface via a hydrothermal reaction to obtain a composite precursor; finally, using dicyandiamine as both a nitrogen and carbon source, stepwise calcining the composite precursor to allow in-situ growth of MOF-template-derived carbon nanotubes, simultaneously forming a Ni / Co2N alloy to obtain the composite material. The composite material of this invention possesses a stable structure and excellent catalytic activity. Using it as a cathode catalyst in lithium-air batteries can effectively reduce polarization during the charge-discharge reaction process, improve the battery's rate capability and cycle performance, and the preparation process is relatively simple, showing promising application prospects.

The high-nickel, low-cobalt cathode material provided in this application includes a cathode material substrate, a first coating layer, and a second coating layer. The first coating layer coats the surface of the cathode material substrate, and the second coating layer coats the surface of the first coating layer. The first coating layer comprises a material with the chemical formula Li. a Ni b Co c M 1‑b‑c O d The material comprises M, which includes one or both of Mn and Al, with 0.2 ≤ a ≤ 1, 0.88 < b ≤ 0.98, 0 ≤ c < 0.06, b + c < 1, and 1.6 ≤ d ≤ 2; the material of the second coating layer includes one or more of Li3PO4, Li2SO4, and LiPO3. The above-mentioned high-nickel, low-cobalt cathode material can prevent the electrolyte from corroding the cathode material matrix, protect the integrity of the bulk structure, and effectively inhibit the decomposition and collapse of the layered structure of the high-nickel, low-cobalt cathode material during charge-discharge cycles, thereby improving the long-cycle performance of the high-nickel, low-cobalt cathode material.