43results about How to "Product properties are stable" patented technology

The invention discloses a preparation method and a natural graphite negative electrode material of a lithium ion battery prepared by the method. The method comprises the following steps: (1) preprocessing spherical natural graphite at high temperature of 500-600 DEG C for 4-6 hours; (2) uniformly mixing the spherical natural graphite in the step (1), a graphitized catalyst and petroleum asphalt to obtain a mixture; (3) carbonizing the mixture in the step (2), cooling, and performing high-temperature catalytic graphitization treatment; and (4) grading. The preparation method of the graphite negative electrode material is simple and feasible and is suitable for industrialization production. The graphite negative electrode material is large in discharge capacity and good in circulating performance; a button battery manufactured by the graphite negative electrode material is excellent in comprehensive performance.

The invention discloses a synthetic graphite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing spherical natural graphite, needle coke-produced coke powder and a graphitization catalyst so as to obtain a mixture; 2) subjecting the mixture and an adhesive which can be graphitized to heating and kneading for 1 to 2 h; 3) pressing the kneaded object into a block shape so as to obtain a formed body of the kneaded object; 4) charring the formed body at 800 to 1500 DEG C under the protection of inert gas and cooling the charred formed body to room temperature; and 5) carrying out catalytic graphitization high temperature treatment at 2800 to 3200 DEG C. The method provided by the invention overcomes the defects of insufficient compacted density and low discharge capacity of a synthetic graphite negative electrode material prepared by using a conventional negative electrode preparation method, can improve cycle performance of the negative electrode material and enables the synthetic graphite negative electrode material with high charge and discharge capacity and high charge and discharge efficiency to be obtained.

The invention discloses a codon-optimized human papilloma virus main capsid protein L1 coding gene, which can efficiently express human papilloma virus main capsid protein L1 after being transferred into yeast cells. The invention further discloses a macromolecule with immunogenicity, which is mainly generated by the expression of the codon-optimized human papilloma virus main capsid protein L1 coding gene in yeast cells. The invention further discloses an application and a composition of the macromolecule with immunogenicity.

The invention provides a niobate reversible photochromic material. The expression formula is Ba1+x-yNb2O6+x:yPr<3+>; x is 0 or 1; y is the molar weight of doped Pr; and y is more than or equal to 0 but less than or equal to 0.03. The color change degree of the inorganic photochromic material provided by the invention is adjusted in the manner of doping rare earth elements. The preparation raw materials of the reversible photochromic material are low in cost; the reducing atmosphere is not required by the preparation; the equipment requirement is low; the preparation process is simple and feasible; the repeatability is high; and the product nature is stable. The color of the niobate reversible photochromic material provided by the invention gradually becomes gray under the irradiation of ultraviolet light, and can recover the original color under the irradiation of sunlight; and the material has the advantage of excellent fatigue resistance and can be widely applied to the fields of optical information storage, light control, optical device materials, inductors, anti-fake products, self-developing holographic recording cameras, decoration, radiation meters, packaging material protection, and the like.