5results about How to "Lower diffusion barrier" patented technology

The application belongs to the technical field of lithium batteries, and discloses a gel electrolyte taking a functionalized two-dimensional MXene material as a dispersant as well as a preparation method and application of the gel electrolyte. The gel electrolyte comprises a functionalized MXene material and a basic electrolyte; the functionalized MXene material is obtained by the following method: 1) treating a MAX phase material with a solution containing HCl and LiF, intercalating, peeling off, and then reacting with a diazonium salt solution to obtain a sulfonic acid functionalized MXene material. The application further discloses a preparation method of the gel electrolyte. The application reconstructs a lithium ion solvation structure, reduces a desolvation energy barrier, homogenizes a bulk phase electric field and ion flow, cooperatively induces formation of a stable SEI interface rich in inorganic species, significantly inhibits lithium dendrite growth, and improves interface kinetic stability. The method is simple and low in cost. The electrolyte is used in a lithium metal battery and exhibits excellent cycle performance.

This invention discloses a method for preparing hard carbon materials for high-rate cycling sodium-ion battery anodes and their applications, relating to the field of energy storage materials technology. The invention uses phenolic resin prepolymer and melamine-formaldehyde prepolymer with a specific degree of polymerization as precursors, constructs a three-dimensional cross-linked network via a solvothermal method, and employs a stepped variable-temperature carbonization process including low-temperature polycondensation, medium-temperature pore-forming, and high-temperature reforming stages. This method utilizes a structure-directing agent to form a closed-pore structure through in-situ decomposition and precisely controls the carbon interlayer spacing. The prepared hard carbon material possesses short-range ordered pseudo-graphite microcrystals and a suitable interlayer spacing (0.38nm-0.42nm). When used as a sodium-ion battery anode, it exhibits a reversible specific capacity higher than 400mAh / g, an initial coulombic efficiency exceeding 92%, and a capacity retention rate greater than 90% after 1000 cycles at 5C high rate. This invention solves the problems of poor rate performance and low initial efficiency of existing hard carbon materials, making it suitable for high-power energy storage devices.

This invention relates to the field of batteries and discloses a method for preparing nickel disulfide / copper sulfide / carbon composite hollow spheres and their applications. The invention uses hollow spherical Ni-MOF as a precursor, combined with subsequent ion exchange, PDA coating, glucose coating, carbonization, and sulfidation to prepare nickel disulfide / copper sulfide / carbon composite hollow spheres. This material inherits the porous hollow structure of Ni-MOF, providing a high-speed and efficient transport channel for ion diffusion in electrode materials, while mitigating volume change effects and improving the cycle life of sodium-ion batteries. Furthermore, the controllable introduction of appropriate amounts of copper ions through ion exchange to form a nickel-copper bimetallic sulfide heterostructure can accelerate ion diffusion kinetics, reduce the ion diffusion barrier, and enhance structural stability. Finally, the nitrogen-doped carbon derived from polydopamine carbonization in the middle layer improves the conductivity of the composite material and increases sodium storage active sites, while the outermost carbon layer derived from glucose carbonization further enhances the structural stability of the composite material.

The invention relates to the technical field of membrane separation, and discloses a preparation method of a high-performance solid electrolyte membrane Joule hot pressed sintering. According to the method, a Joule hot pressing sintering process is adopted, solid electrolyte powder is taken as a raw material, a proper amount of powder is weighed and put into a mold of Joule hot pressing equipment, and pressure is applied to an upper graphite plate and a lower graphite plate in a vacuum or inert gas environment. Through the synergistic effect of external pressure and Joule heat, the temperature of the material can be rapidly increased to 800-1500 DEG C in an extremely short time, and heat-preservation sintering is completed, so that the sintering period is remarkably shortened, the preparation efficiency is improved, and a compact and high-performance solid electrolyte membrane is obtained. Compared with a traditional heating furnace which needs at least more than 3 hours in heating time and Joule hot pressing is controlled within 1 minute, the heating time can be effectively shortened by at least 90% or more, and the prepared solid electrolyte membrane has high density and low defects, shows excellent ion separation performance and is suitable for industrial production. And a reference thought is provided for related fields such as efficient recovery and extraction of lithium resources.

This invention belongs to the field of electrochemical power source technology, and relates to a multi-metal ion-substituted V site M x V₂O₅ materials, their preparation methods, and applications. The preparation steps are as follows: Citric acid monohydrate, anhydrous oxalic acid, and ammonium metavanadate are sequentially added to deionized water and stirred until completely dissolved to obtain a first solution; citric acid monohydrate and a salt containing metal cation M are added to deionized water and stirred until the salt containing metal cation M is completely dissolved to obtain a second solution; the two solutions are mixed evenly and reacted under a preset temperature to form a gel-like product; the gel-like product is dried to obtain a precursor dry gel; then, after grinding and high-temperature annealing, M is obtained. x V₂O₅ material. The M x When V2O5 is used as a cathode material for lithium-ion secondary batteries, it exhibits excellent reversible capacity and cycle stability, and eliminates the problems of voltage drop and poor cycle stability of traditional V2O5 during discharge.