2results 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.