32results about How to "Alleviate structural collapse" patented technology

The invention discloses a method for preparing an urchin-like vanadium base nanometer electrode material and application of the material. The method comprises the steps of adding vanadium pentoxide into aqueous hydrogen peroxide, and performing electromagnetic stirring in water bath to prepare a vanadium precursor solution; taking the vanadium precursor solution, ethylene glycol and deionized water and adding ammonium sulfate, controlling the solution within Ph2.0-3.0, performing electromagnetic stirring to mix the solution, and transferring the solution to a hydrothermal reaction kettle to perform hydrothermal reaction for 5-48h at 160-200 DEG C; centrifuging, washing and drying to prepare the electrode material. The invention further discloses a method for preparing an electrode plate, and the method is characterized in that the urchin-like vanadium base nanometer electrode material is mixed with a binder and a conductive agent according to the weight proportion of (70-80) to (0-10) to 10 and a current collector is coated with the mixture. According to the method, V205 with the relatively low price is regarded as a vanadium source without any surface active agent; the preparation process is simple, efficient, steady and economic, the morphology change of the material is slightly affected by heat treatment, and the prepared urchin-like vanadium base nanometer electrode material has high specific capacity and long cycling life in water electrolyte and organic electrolyte.

The invention belongs to the field of battery electrode materials and relates to a preparation method and application of a flower-shaped FeSx/C nano composite material. The invention adopts one-step hydrothermal method, realizes the synthesis of flower-shaped FeSx/C composite material by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature, and uses the flower-shaped FeSx/C composite material as a negative electrode material for sodium ion battery, wherein the flower-shaped FeSx/C composite material is synthesized by regulating reaction temperature, solution acidity and alkalinity, and calcination temperature. The preparation method of the invention has the advantages that raw materials are easy to obtain, the synthesis method is simple and feasible, the carbon coating effect is good and the repeatability is strong, and the FeSx/C composite material prepared by the invention is used as the negative electrode material of the sodium ion battery, so that the specific capacity of the battery can be effectively improved, and the stability and the rate performance of the battery can be enhanced.

The invention discloses a three-dimensional metal nanowire and a preparation method thereof. The preparation method comprises the following steps that S1, a metal ion solution with the concentration being 0.01-1 mol/L is prepared, a complexing agent and a nucleating agent are added, and a solution A is obtained by adjusting the pH value to be 10.0-13.5 through an alkaline solution, and magnetic metal ions or mixtures of magnetic metal ions and nonmagnetic metal ions are used as the metal ions; S2, a reducing agent solution with the concentration being 0.1-3 mol/L and with high reduction property is prepared, and a solution B is obtained by adjusting the pH value to be 10.0-13.5 through an alkaline solution; and S3, a reactor is provided, a base subjected to activation treatment is placed in the reactor, the solution A and the solution B are poured into the reactor, fully mixed, and reacted for T time under the 0.005-1 T magnetic field condition at 50-100 DEG C, and reaction stoste containing the three-dimensional metal nanowire formed by magnetic metal nanowires or alloy nanowires is obtained. Through the preparation method, the three-dimensional-structure metal nanowire arranged orderly can be prepared.

The invention relates to a preparation method of a lithium ion battery negative electrode material, and a lithium ion battery. The preparation method of the negative electrode comprises the followingsteps: adding a certain amount of Ti3AlC2 into a mixed solution of LiF and HCl, and reacting to obtain accordion-shaped Ti3C2; adding Ni salt and acrylic acid into the obtained Ti3C2 turbid liquid, and carrying out irradiation in gamma rays generated by <60>Co; and pouring the turbid liquid into liquid nitrogen for quick freezing, then freeze-drying the obtained product, and finally coating the Ti3C2-NiO with a carbon layer by adopting a CVD method. According to the invention, the prepared composite material NiO particles are uniformly dispersed among three-dimensional accordion-shaped Ti3C2 sheet-shaped gaps, so that material pulverization and structure collapse caused by the volume expansion effect of NiO in the charging and discharging process are effectively relieved, and the conductivity of NiO is effectively improved through the Ti3C2 and CVD carbon layer.

The invention relates to a method for preparing bacterial cellulose/NBSK (Northern Bleached Softwood Kraft) aerogel spheres under the assistance of a cation solution. The method comprises the following steps: inoculating acetobacter xylinum into a liquid seed culture medium, and culturing statically to obtain seed liquid; adding NBSK or modified NBSK and a liquid fermentation culture medium into a conical bottle, adjusting the pH to 5.6-7.0, and performing sterilizing treatment; inoculating the seed liquid, and dynamically culturing to obtain the bacterial cellulose/NBSK hydrogel spheres, treating the hydrogel spheres with sodium hydroxide, washing, soaking into deionized water, dropwise adding the cation solution, reacting in a shaking table, adjusting the pH value of the system to an alkaline state, and soaking; taking the hydrogel spheres out, and drying with a solvent to obtain the bacterial cellulose/NBSK aerogel spheres. In the method, large-sized instruments are not needed, and only an ordinary reflux condensation device is needed during drying; the finished product rate of the prepared bacterial cellulose/NBSK aerogel spheres can be up to 50-65 percent.