7results 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.

The invention provides a titanium gypsum curing agent, a preparation method and application, and belongs to the technical field of road engineering materials. The raw materials comprise, by weight, 30-50 parts of an exciting agent, 10-15 parts of a filling material, 30-50 parts of an active solid waste material, 1-10 parts of calcium oxide, and 2-5 parts of a dispersant; the exciting agent comprises an agent A and an agent B in a mass ratio of 0.025-0.08; the agent A comprises sodium hydroxide and potassium hydroxide; and the agent B comprises composite Portland cement and ordinary Portland cement. The synergistic hydration hardening effect among the solid waste raw materials is fully utilized, the solid waste raw materials and the titanium gypsum can generate the synergistic activation effect through the double salt effect and the tetra-coordination isomorphism effect of silicon, a compound or solid solution with certain strength and stability is formed, harmful substances in the titanium gypsum are physically wrapped, and the titanium gypsum is prepared. The effective curing of harmful substances of the titanium gypsum is realized, and certain road strength is generated.

The invention provides a preparation method of a polymer-coated silicon-based negative electrode material, and the preparation method comprises the following steps: carrying out carbon coating on a silicon-based material, and then uniformly mixing with a lithium source to obtain a pre-lithiated silicon negative electrode precursor; calcining the pre-lithiated silicon negative electrode precursor under protective gas to obtain a pre-lithiated silicon negative electrode material; and carrying out acid pickling on the pre-lithiated silicon negative electrode material, and then carrying out polymer coating, wherein the polymer is one or more of PMMA (Polymethyl Methacrylate), PEO (Polyethylene Oxide), PVA (Polyvinyl Alcohol), PVDF-HFP (Polyvinylidene Fluoride-Hexafluoropropylene), PANI (Polyaniline), PPY (Polypropylene), PBS (Phosphate Buffer Solution The first coulombic efficiency is improved by supplementing the number of reversible lithium ions, and the overall battery energy density is improved. The problems of overhigh alkalinity and the like are solved through pickling, and the cycle performance of the electrode is improved. Moreover, the volume expansion of the material is relieved to a certain extent through multi-layer coating, the cycling stability of the electrode is improved, the active substance silicon particles in the material are further prevented from reacting through coating of the polymer layer, and the electrochemical performance of the electrode is improved.

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.

The invention discloses a preparation method of core-loaded T-Nb2O5 coated Si skin-core structure carbon fiber, which specifically comprises the following three steps: carrying out surface hydroxylation treatment on nano silicon powder, preparing a niobium pentoxide coated nano silicon structure and preparing niobium pentoxide coated silicon skin-core structure carbon nanofiber. According to the core-loaded T-Nb2O5-coated Si skin-core structure carbon fiber obtained by the preparation method, the surfaces of the nano silicon particles are coated with T-Nb2O5, the volume expansion of silicon is limited by utilizing the structural stability of the T-Nb2O5, the cycle stability and the rate capability of a modified silicon negative electrode are remarkably improved while the high discharge specific capacity is ensured, and the service life of the modified silicon negative electrode is prolonged. And the application of the lithium ion battery cathode in the lithium ion battery cathode is beneficial to improving the energy density of the battery, prolonging the endurance life of electric equipment, and further promoting the popularization of electric automobiles, thereby reducing the use of fossil fuel and carbon emission.

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.