7results about How to "High phase purity" patented technology

The invention relates to an O2-phase lithium cobalt oxide positive electrode material and a preparation method thereof, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: S1, uniformly mixing a doped metal source, a sodium source and a cobalt source, sintering, and cooling to obtain a P2-phase precursor; s2, uniformly mixing the P2-phase precursor, a lithium source A and the coating layer precursor, sintering, and cooling to obtain an intermediate A; s3, uniformly mixing the intermediate A and a lithium source B, sintering, and cooling to obtain an intermediate B; and S4, uniformly mixing the intermediate B and a lithium source C, sintering, cooling, washing and drying to obtain the O2-phase lithium cobalt oxide positive electrode material. The O2-phase lithium cobalt oxide positive electrode material with low residual sodium, high structural stability and excellent interface coating performance is prepared through a method of combining gradient ion exchange, gradient temperature control, gradient atmosphere regulation and control and synchronous in-situ coating.

The application discloses a preparation method of a polyanionic sodium ion battery positive electrode material, and comprises the following steps: S1, preparation of a precursor solution: a transition metal M source, an acid solution and a complexing agent are mixed and dissolved to form a precursor solution; S2, preparation of a pre-oxidized precursor solution: an oxidizing agent is added to the solution to generate a pre-oxidized precursor solution; S3, preparation of M(OH)x precipitation: a pH value of the pre-oxidized precursor solution is adjusted so that transition metal ions in the solution are precipitated in the form of M(OH)x; S4, preparation of a precursor powder: the M(OH)x precipitation, a sodium source, a phosphorus source and a carbon source are mixed wetly to obtain a precursor slurry; S5, drying of the precursor powder: the precursor slurry is dried and separated to obtain a dried precursor powder; and S6, high-temperature sintering: the precursor powder is sintered at a high temperature to obtain a polyanionic material. The polyanionic sodium ion battery positive electrode material has the characteristics of excellent electrochemical performance, high compaction density and low cost.

This invention proposes an ABX3 seed-induced crystallization perovskite thin film and a method for preparing the same for photovoltaic cells. The ABX3 seed-induced crystallization perovskite thin film contains potassium stannate. This ABX3 seed-induced crystallization perovskite thin film exhibits high crystallinity and good stability.

This invention discloses a method for preparing a composite polyanionic sodium-ion battery cathode material, relating to the field of sodium-ion battery cathode material technology, including the following steps: S1, preparing in-situ doped ferrous sulfate; S2, preparing a graphene-based dispersion; S3, preparing a modified ferrous sulfate solution; S4, preparing an NFPP precursor; S5, preparing an NFPP cathode material. This invention uses stainless steel pickling waste liquid as raw material, first reducing it by adding elemental iron, then dispersing it in a graphene-based dispersion containing tannic acid to obtain carbon-coated modified ferrous sulfate; preparing the NFPP precursor by co-precipitation; and finally sintering to obtain a composite polyanionic sodium-ion battery cathode material with high compaction density and better electrochemical performance, thus improving the problems of poor conductivity, low compaction, low capacity, low rate capability, and high cost of existing NFPP cathode materials.

The invention belongs to the field of magneto-optical film materials, and particularly relates to a high-phase-purity Ce-doped iron garnet magneto-optical film and a preparation method thereof. The method comprises the following steps: firstly, depositing a layer of YIG film with the thickness of 50-60 nm on a silicon-based substrate as a seed layer through a film preparation process; then, an amorphous Ce: RIG film with the thickness of 10-15 nm is deposited on the YIG, and an amorphous YIG film with the thickness of 1-2 nm is continuously deposited on the amorphous Ce: RIG film; integrally annealing and crystallizing the two layers of amorphous films; and finally, the magneto-optical material film with the required thickness can be obtained by circulating the process of depositing the two layers of amorphous films and integrally annealing and crystallizing. The multi-time deposition annealing magneto-optical thin film material is used, the phase purity of the Ce: RIG thin film and the Ce < 3 + > content in the thin film are improved, compared with a high-temperature deposition and multi-time deposition annealing process, the thermal budget is lower, substrate oxidation can be effectively avoided, the problems of precipitates and element valence states of the silicon-based polycrystalline magneto-optical thin film are solved, and the yield of the silicon-based polycrystalline magneto-optical thin film is improved. And the method has great significance in preparation of the Ce: RIG thin film with high phase purity.

This invention discloses a method for preparing hybrid metal halide crystals based on in-situ organic reactions. The method first dissolves bismuth bromide or antimony bromide in a mixed solution of dimethyl sulfoxide and hydrobromic acid. Then, acetone is added to the reaction system, allowing dimethyl sulfoxide and acetone to sequentially generate intermediate and product cations under acidic conditions. These two cations enter the hybrid metal halide crystal lattice as organic components in an independent and mixed manner, thereby achieving a directional structural transformation of three highly correlated types of hybrid metal halides. The transformation rate depends on the system's settling temperature. The compound product prepared by this invention is lead-free, has low toxicity, and yields crystals with high integrity and crystallinity. This method is simple, capable of mass production, and highly suitable for widespread application.

The invention relates to the technical field of batteries, and discloses a preparation method of a lithium nickel manganese oxide positive electrode active material, a battery monomer, a battery device and a power utilization device. The lithium nickel manganese oxide positive electrode active material in the battery monomer comprises a substrate and a coating layer arranged on the surface of the substrate; the matrix comprises single-crystal lithium nickel manganese oxide, the single-crystal lithium nickel manganese oxide is a flaky particle, the length of the flaky particle is 1-5 [mu] m, the width is 1-5 [mu] m, and the thickness is 0.25-1 [mu] m; the coating layer comprises lithium-based oxysalt and / or oxide containing an M element, and the M element is selected from one or more of silicon, boron, aluminum and titanium; in the matrix surface layer, the content of the M element is less than or equal to 100 ppm; wherein the substrate surface layer refers to an area which vertically extends 200nm from the surface of the substrate to the interior of the substrate. The battery monomer provided by the embodiment of the invention has relatively high rate capability and relatively good cycle performance.