4results about How to "Limit volume expansion" patented technology

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

This invention discloses a surface-modified high-pressure SiO2 x The preparation method of this invention includes the following steps: preparation of a carbon layer precursor by controlling the reaction time to prepare spherical carbon layer precursors of different sizes; thorough mixing of the carbon layer precursor with a silicon source and aging of the mixed solution; filtration and washing of the reaction solution followed by drying in a vacuum drying oven, and then sintering under an inert atmosphere to obtain multilayer carbon-coated SiO2. x Materials; SiO2 prepared by the technical solution of this invention x The material has a higher compaction density, thus reducing matrix pulverization. Meanwhile, the SiO₂ prepared by this invention... x The number of carbon shell layers in the material can be controlled, suppressing volume changes during charging and discharging.

This invention discloses a nano-solid-state hydrogen storage material and its preparation method, belonging to the field of new energy materials technology. The nano-solid-state hydrogen storage material has a core-shell structure, comprising a nano-magnesium-based active phase core and a functionalized porous carbon material outer shell; the core contains in-situ grown multi-metal nanocatalyst particles; the outer shell is doped with non-metallic elements and loaded with metal-organic framework derivative nanoparticles; the core-shell structure is dispersed in a three-dimensional interconnected carbon-based network framework. The preparation method includes: preparing a multi-metal-organic framework precursor solution; synthesizing multi-metal-organic framework nanoparticles using a solvothermal method; chemically combining with a magnesium source and a nickel source to obtain a precursor composite; carbonization treatment to obtain a porous carbon-coated multi-metal nanocatalyst@magnesium-based composite material; constructing a three-dimensional network framework by combining with a functionalized carbon source and metal-organic framework derivatives; and high-pressure hydrogenation treatment. The material of this invention exhibits a low hydrogen desorption temperature, rapid hydrogen absorption and desorption kinetics, and excellent cycle stability.

A method for preparing a molybdate conversion film self-supporting aluminum foil negative electrode. It relates to a method for preparing a lithium ion battery negative electrode material. The present invention solves the problems of low specific capacity of lithium ion battery negative electrode material, rapid capacity attenuation and the like. The method of the present invention is as follows: 1. Pretreatment of aluminum foil; 2. Preparation of molybdate conversion coating; 3. Pre-lithiation of molybdate conversion film self-supporting aluminum foil negative electrode; 4. Preparation of lithium ion battery positive electrode and battery assembly. The pre-lithiated aluminum foil negative electrode material prepared by the method of the present invention has smaller impedance, relatively lower polarization, higher charge / discharge specific capacity and more stable cycle compared with the battery assembled by the aluminum foil negative electrode material without pre-lithiation. By generating a molybdate conversion film on the surface of the aluminum foil in situ, the liquid affinity of the aluminum foil surface can be effectively improved, thereby improving the contact area of the electrode and the electrolyte. A new direction is provided for the preparation of lithium ion battery negative electrode material. The present invention is applied to the field of lithium-free anode full battery.