8results 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.

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.

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.