3results about How to "Low defect content" patented technology

The invention provides a zinc-doped or pre-sodium / potassium-zinc-doped hard carbon negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: weighing 2, 4-diaminophenol and zinc salt, adding the 2, 4-diaminophenol and the zinc salt into a solvent, and uniformly stirring and mixing; adding a formaldehyde solution for water-bath heating and stirring reaction; and filtering, cleaning and drying the product to obtain a sample, mixing the sample with hard carbon particles, calcining at high temperature, and cooling to obtain the zinc-doped hard carbon negative electrode material. And further, carrying out sodium pre-treatment or potassium pre-treatment by adopting a DMC-Na or DMC-K solution to obtain the pre-sodium / potassium zinc doped hard carbon negative electrode material. The zinc-doped hard carbon negative electrode material has an expanded graphite region and highly developed nanopores, and is high in conductivity; after pre-sodium or pre-potassium treatment, hard carbon surface defects are remarkably improved, an SEI film is formed, side reaction between electrolyte and the hard carbon surface is further isolated, the dynamic performance of the material is remarkably improved, ICE is remarkably improved, and the cycle performance of the material is considered on the basis of dynamics.

The invention provides a method for improving impact toughness of electric arc additive manufacturing titanium alloy, and belongs to the technical field of additive manufacturing. The method comprises the steps that a pretreated forming base material is placed on a cooling device in a gas protection device, when the oxygen content in the gas protection device is smaller than 1000 ppm, the electric arc additive manufacturing process of the titanium alloy is started, meanwhile, the cooling device is started to cool the forming base material, the cooling device is placed in the gas protection device, and the cooling device is started to cool the forming base material. According to the method, the cooling device can cool the environment gas in the gas protection device while cooling the base material, printing can be conducted at a low temperature in the whole additive manufacturing process, and compared with an existing additive printing process in which the environment oxygen content needs to be controlled to be 100 ppm or below, due to the fact that the environment is low in the printing process, the printing efficiency is greatly improved. And the temperature of the formed base material is low all the time, so that the printing quality of the titanium alloy can be guaranteed even if printing is conducted under the high oxygen content, and the titanium alloy is not prone to being oxidized.

This invention provides a method for preparing perovskite titanate materials with preferred growth on the (311) crystal plane and its application. The structural formula of the perovskite titanate material is A. x B y TiO4, wherein element A is at least one of Na, Ca, and La, and element B is at least one of Y, Ni, and Sr, and 0 < x ≤ 1, 0 < y ≤ 1. The perovskite titanate material prepared by this invention has a low crystal defect content, and the (311) crystal plane is the dominant crystal plane. The (311) direction is the direction of rapid diffusion of lithium ions in the bulk structure of the perovskite titanate material. The perovskite titanate material dominated by the (311) crystal plane has a short ion diffusion distance and a fast overall lithium ion diffusion rate, thereby improving the rate performance of the material.