34results about How to "Reduce the difficulty of dispersion" patented technology

The invention provides a preparation method of a conductive paste for a PERC solar cell and application thereof. An aluminum-silicon mixed conductive paste containing doping elements according to the present invention comprises 60 to 85 percent of aluminum powder, 5 to 25 percent of doped silicon nanoparticles, 0.1 to 5 percent of inorganic binder and 15 to 35% of organic carriers, wherein the organic carriers are mainly composed of an organic solvent, a thickening agent and a plasticizer. Compared with existing aluminum conductive paste products, the conductive paste for the PERC solar cell of the invention is printed on the back of the a battery sheet, and in a cell sintering process, on one hand, back holes can be reduced to promote the formation of a silicon aluminum alloy layer and reduce contact resistance; on the other hand, the back field doping concentration and the junction depth can be increased, and the composite rate on the back surface can be reduced in order to improve the PERC cell photoelectric conversion efficiency.

The invention provides a lithium ion battery and a positive electrode slurry stirring method therefor, and belongs to the technical field of lithium ion batteries. The positive plate of the lithium battery comprises a positive current collector and positive slurry coated on the positive current collector, wherein the positive electrode slurry contains a positive electrode active substance, a conductive agent and a binder; the positive electrode active substance is a mixture of lithium nickel cobalt manganate, lithium iron phosphate and lithium manganite; a mixer circulating water temperature control regulating system comprises a temperature frequency conversion regulating switch and a circulating water heating system in the stirring process of the positive electrode slurry of the lithium ion battery, and the circulating water temperature of the circulating water heating system is set to be 45-75 DEG C. The dispersity of the lithium battery positive electrode slurry is improved, the stirring time is shortened, the production qualification rate and the consistency of the lithium batteries are improved, and the lithium battery positive electrode slurry has higher convenience and operability and economic and practical values.

The invention discloses a method for preparing ultralow-temperature lithium ion battery anode slurry, relates to the technical field of lithium ion batteries, and solves the problem that the whole battery cannot normally operate in a low-temperature environment due to poor low-temperature resistance of a lithium ion battery anode. The process comprises the following steps: preparing materials, pretreating graphite, spraying, stirring and mixing, and discharging seasonings, wherein the raw materials mainly comprise graphite, an anti-settling agent CMC, a water-based adhesive SBR, deionized water, polyaniline, silicon monoxide and an accelerant. The ultralow-temperature lithium ion battery anode slurry prepared by the invention has good low-temperature resistance in the use process, and is beneficial to keeping the whole battery to normally operate.

The invention belongs to the field of energy storage researches and in particular relates to a lithium titanate negative electrode material. The lithium titanate negative electrode material comprises a core structure and a shell structure, wherein the core structure has a secondary particle structure formed by uniformly dispersing primary nanoparticles into conducting agents and tightly stacking; the primary nanoparticles comprise lithium titanate nanoparticles; conducting networks are distributed among the lithium titanate nanoparticles, among the conducting agents and between the lithium titanate nanoparticles and the conducting agents; the conducting networks are tightly connected with the lithium titanate nanoparticles and the conducting agents, so that the lithium titanate negative electrode material has good electrochemical performance.

The invention discloses a bifidobacterium longum BL986, freeze-dried powder prepared from the same and application of the freeze-dried powder. The bifidobacterium longum BL986 was submitted to the China General Microbiological Culture Collection Center (CGMCC) on October 28, 2019 for preservation with the preservation number CGMCC No.18743. When the bifidobacterium longum BL986 is used to preparelactic acid bacteria freeze-dried powder and the prepared lactic acid bacteria freeze-dried powder is used to prepare chocolate, the dispersibility is good, the uniformity is high, and the product quality is greatly improved.

The invention provides a dispersion method of a nano material. The method comprises the following steps: mixing a nano material with a surfactant to obtain a first mixture; mechanically dispersing thefirst mixture in a first negative oxygen ion environment to obtain a first dispersion; and in a second negative oxygen ion environment, carrying out ultrasonic dispersion on the first dispersion to obtain a second dispersion. According to the invention, the dispersion method belongs to a physical dispersion method, is rapid, safe and efficient, avoids the problem that other components are added in a chemical dispersion method to influence the nano material, and does not influence the function exertion of each component and the overall performance of the composite material; and mechanical dispersion and ultrasonic dispersion are adopted at the same time, and negative oxygen ions are added in different stages in a dispersion process to form a negative oxygen ion environment, so that the dispersion efficiency is improved, the dispersion difficulty is reduced, the dispersion effect is improved, and the preparation time cost is remarkably saved.

The invention belongs to the field of energy storage research, and particularly relates to a preparation method of a lithium titanate negative electrode material. The method mainly comprises the steps of 1, mixing a power source substance 1, nanometer lithium titanate particles and graphite particles until uniform mixing is achieved; 2, adding an electrolyte 1 and then continuing to mix to form ion passages, stripping the graphite particles under the effect of the power source substance at the moment to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer lithium titanate particles under a hybrid acting force; and 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium titanate negative electrode material. When the method is used for preparing a lithium titanate negative electrode, the opening of the graphite particle sheet layer and the filling of the lithium titanate particles can be simultaneously performed, so that the filling is smoother, and the lithium titanate negative electrode material is enabled to have favorable electrochemical performance.

The invention belongs to the field of energy storage research, and particularly relates to a preparation method of a lithium ion battery positive electrode material. The method mainly comprises the steps of 1, dry-mixing a power source substance 1, nanometer positive primary particles and graphite particles until uniform mixing is achieved; 2, adding an electrolyte 1 and then continuing to mix to form ion passages, stripping the graphite particles under the effect of the power source substance to form an opening structure of a graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; or 1', uniformly mixing the nanometer positive primary particles, the graphite particles and an electrolyte 2 for use; 2', assembling a power source substance 2 and the product obtained in the step 1' to form paired electrodes, applying a current between the two electrodes, stripping the graphite particles to form the opening structure of the graphite sheet layer, and continuously filling the opening structure of the graphite sheet layer with the nanometer positive primary particles; 3, removing an electrolyte constituent after filling is completed, and performing coating and carbonization to obtain the lithium ion battery positive electrode material. When the method is used for preparing a lithium ion battery positive electrode, the opening of the graphite particle sheet layer and the filling of the nanometer positive primary particles can be simultaneously performed, so that the filling is smoother, and the lithium ion battery positive electrode material is enabled to have favorable electrochemical performance.

The invention relates to low-shrinkage high-strength concrete and a preparation method thereof. The method comprises the following steps: uniformly mixing cement, river sand and petroleum coke powderto obtain a mixed dry material; adding vermiculite powder and mineral powder into water, activating and ball-milling to obtain a premix; pouring the mixed dry material into the premix, uniformly stirring and mixing, adding a fiber gel composite material, light aggregate and an additive, and uniformly stirring to obtain slurry; finally, injecting the slurry into a mold, vibrating, forming and curing to obtain the low-shrinkage high-strength concrete. The high strength and the low shrinkage of the product are guaranteed.