189results about How to "Shorten migration distance" patented technology

The invention belongs to the technical field of lithium ion batteries and particularly relates to a method for quickly generating a lamination flexible package lithium ion battery. The method comprises a stage of forming a solid electrolyte phase interface film and a stage of discharging formation gas. The main theoretical foundation is that the solid electrolyte phase interface film is mainly formed at the initial stage of formation charging, accompanied with the discharging of the formation gas. The formation of an SEI film is subjected to the influences of current density and temperature and the like. Under a small current density, first organic lithium salt is formed on the surface of a cathode and then inorganic lithium salt is formed, so that the formed SEI film is denser, and ingredients are more stable. At this stage, a high-pressure pressurization formation mode is adopted, the reaction activity can be increased, the reaction is accelerated, battery surface pressure is increased, the ionic migration distance can be shortened, and formation efficiency and pole piece surface reaction consistency are improved. Compared with a conventional formation process, according to the method, the formation time is shortened, the formed SEI film is denser and more stable, and the method can be widely applied to industrial production.

The present invention is granular electrode catalyst stuffing for 3D electrode reactor and its preparation process. The electrode catalyst stuffing consists of modified active carbon 60-70 wt% and film coating active carbon 40-30 wt%. The modified active carbon is prepared with active carbon through acid or alkali modification, oxidizing modification and metal supporting modification; and the film coating active carbon is prepared with active carbon through acid or alkali modification and soaking in cellulose acetate solution. The 3D granular electrode stuffing is used in waste water treatment, and has the advantages of great adsorption capacity, fast reaction speed, stable treating effect, etc.

The invention provides an egg-shaped dual-carbon shell layer tin-based negative electrode material of a lithium ion battery and a preparation method for the negative electrode material. The egg-shell-shaped dual-layer carbon-coated stannic oxide nanocomposite comprises a porous stannic oxide sphere kernel and a dual-layer carbon shell for coating the surface of the porous stannic oxide sphere kernel, and a hollow layer exists between the two parts; the preparation method comprises the steps of preparing the egg-shell-shaped silicon dioxide-coated porous stannic oxide sphere nanocomposite by adopting a surfactant soft template method, and then attaching an organic pyrolytic carbon raw material on the surface of the nanocomposite, and performing a hydrothermal reaction and then carrying out condensation polymerization and carbonization to obtain the egg-shell-shaped carbon-silicon dioxide-carbon-coated stannic oxide sphere nanocomposite, and finally, performing etching by adopting a sodium hydroxide alkali solution to obtain the egg-shell-shaped dual-layer carbon-coated stannic oxide nanocomposite. Finally, the invention provides the tin-based negative electrode material of the lithium ion battery with nanometer scale, high conductivity and capability of effectively suppressing the volume effect of stannic oxide, and a preparation method for the negative electrode material.

The invention discloses a preparation method of an anode material for a lithium ion battery, which comprises the following steps of: mixing titanium dioxide with lithium carbonate to be ball-milled evenly, carrying out heat preservation for 10-180 minutes at the temperature of 750-850 DEG C and cooling to obtain lithium titanate; and mixing the lithium titanate with a solid-state nitrogen source compound to be calcined with the protection of protective gas, and obtaining the anode material for the lithium ion battery after reaction. In the step of preparing the lithium titanate, the time for heat preservation of raw materials at high temperature is greatly shortened, the aggregation of material particles caused by long-time ignition is avoided, the particle size of the lithium titanate is greatly reduced, and the modification area of TiN after the lithium titanate is nitrided is increased, so that the conductivity performance of the prepared anode material for the lithium ion battery is improved. In addition, due to the reduction of the particle size of the lithium titanate, the migration distance of lithium ions in a charge-discharge process of the lithium ion battery is reduced, and thus the large current charge-discharge performance of the anode material for the lithium ion battery is improved.

The invention relates to the field of solar batteries, in particular to a main-grid-free efficient back-contact solar battery and assembly and a manufacturing technology of the main-grid-free efficient back-contact solar battery and assembly. The main-grid-free efficient back-contact solar battery comprises a solar battery piece and an electric connection layer. The backlight surface of the solar battery piece is provided with an electrode P and an electrode N, wherein the electrode P is connected with a P-type doped layer, and the electrode N is connected with an N-type doped layer. The solar battery is characterized in that the electric connection layer comprises a plurality of conductive fine grid lines, the conductive fine grid lines are partially connected with the electrode P on the backlight surface of the solar battery piece, and the remaining conductive fine grid lines are connected with the electrode N on the backlight surface of the solar battery piece. The conductive fine grid lines are each of a multi-segment structure. The main-grid-free efficient back-contact solar battery and assembly and the manufacturing technology of the main-grid-free efficient back-contact solar battery and assembly have the advantages that the usage amount of silver paste is reduced, and the cost is lowered; as the multi-segment conductive fine grid lines are arranged, series resistance is lowered, and the transmission distance of fill factors is shortened; efficiency is improved, and meanwhile the stress on the battery piece by the conductive fine grid lines can be effectively reduced.

The invention discloses a method for preparing a visible-light response photocatalyst by utilizing nano Zn2SnO4. The method comprises a step of preparing a solvent thermal product, a step of preparing Zn2SnO4 nano powder, a step of preparing a turbid liquid, a step of preparing a hydrothermal reaction product and a step of preparing the visible-light response photocatalyst. According to the method disclosed by the invention, a synthesis process is simple and convenient, impurities introduced by follow-up processes such as high-temperature calcining and ball-milling and structure defects are avoided, operations are easy, and purity of products synthesized by reaction is high. The visible-light response photocatalyst synthesized by the method is a nano structure, is small in crystalline grain, and has a mesoporous structure and a relatively great surface area, so that light absorption capacity of the visible-light response photocatalyst is strengthened; and meanwhile, a migration distance of light-generated electrons is shortened, and recombination probability of light-generated electrons and electron-hole pairs is reduced.

The invention relates to the field of solar batteries, in particular to a main-grid-free high-efficiency back contact solar battery module, an assembly and a preparing process. The solar battery module comprises a battery piece and an electric connecting layer, wherein the back light side of the battery piece is provided with an electrode P connected with a P type doping layer and an electrode N connected with an N type doping layer. The solar battery module is characterized in that the electric connecting layer comprises a penetrating hole and a conducting wire, the conducting wire is respectively arranged at the front side and the back side of the electric connecting layer, the front side conducting wire is electrically connected with any one electrode, the back side conducting wire is electrically connected with the other electrode through conducting media in the through hole, and the electric connecting layer is made of insulation materials. The solar battery module, the assembly and the preparing process have the beneficial effect that the low-cost hidden-crack-resistant high-efficiency and high-stability solar battery assembly capable of preventing emitting electrode P and emitting electrode N short circuit is provided.

The invention belongs to the technical field of preparation and application of nano materials and particularly relates to a carbon-coated Li4Ti5O12-TiO2/Sn nanocomposite and preparation and application thereof. The carbon-coated Li4Ti5O12-TiO2/Sn nanocomposite is composed of 19wt%-65wt% of Li4Ti5O12, 11wt%-57wt% of TiO2, 23wt%-49wt% of Sn and 1wt%-24wt% of a carbon coating layer. The carbon-coated Li4Ti5O12-TiO2/Sn nanocomposite gives play to synergistic effects of the carbon coating layer with functions of electronic conductivity improvement and ion permeability improvement, the metal Sn with high specific capacity and a one-dimensional nano Li4Ti5O12-TiO2 substrate with small size change in an electrochemical lithium intercalation process, shows excellent electrochemical performances and has a promising application prospect in fields of lithium ion batteries in fast-charge electronic products, electric vehicles and the like.

The invention discloses a preparation method of a multiple-duct composite metal oxide. The preparation method comprises the following steps of: adding metal salt and citric acid to a surfactant or a segmented copolymer which is taken as a soft template and a brine shrimp egg shell which is taken as a hard template;, and stirring to obtain wet gel; drying the wet gel in a drying box, and calcining the dried gel in a muffle to obtain the multiple-duct composite metal oxide. The preparation method is low in cost, simple in process, easy to control and good in repeatability, ensures that pore size distribution is uniform and pore walls are communicated with one another, and can be widely applied to the fields of catalysis, fuel batteries and electrode materials.

The invention provides a preparation method of ternary layered positive electrode material for a sodium ion battery. The preparation method comprises the following steps: mixing sodium carbonate, manganese monoxide, ferrous oxide and nickel oxide according to a given ratio, adding deionized water, preparing the mixture slurry with a solid content of 30 to 45 percent, ball milling, obtaining a uniformly-mixed raw material with small particles, obtaining a precursor in an atomizing manner, wherein the precursor consists of spherical particles formed by clustering small particles, calcining the spherical particles at high temperature, preserving the heat for a given time, cooling, and obtaining the needed NaMn1-x-yFexNiyO2(x is greater than 0 and less than 0.5, and y is greater than 0 and less than 0.5) positive electrode material. The ternary layered positive electrode material for the sodium ion battery synthesized in the invention has the spherical particle appearance characteristic and nano porous internal structure, so that the transport distance of the sodium ions between the interior of a material lattice and electrolyte can be reduced, and the electrochemical performance of the material can be improved.

The invention discloses a synthetic method for a cathode material lithium cobaltous phosphate used for lithium ion batteries. The method comprises a step of dissolving cobaltous acetate in deionized water to prepare an aqueous solution of the cobaltous acetate; a step of dissolving lithium hydroxide and sucrose in deionized water to prepare a lithium hydroxide/sucrose mixed solution; a step of adding phosphoric acid in deionized water to prepare a phosphoric acid solution; a step of adding the phosphoric acid solution into the aqueous solution of the cobaltous acetate to obtain a burgundy emulsion, stirring uniformly, adding the lithium hydroxide/sucrose mixed solution into the burgundy emulsion, mixing uniformly, and adding nitric acid to obtain a precursor solution; a step of subjecting the precursor solution under stirring to spray drying to obtain a precursor of lithium cobaltous phosphate powder; and a step of subjecting the precursor of the lithium cobaltous phosphate powder to vacuum calcination at 600-750 DEG C for 16-26 h to obtain the cathode material lithium cobaltous phosphate with a spherical porous structure and a high specific capacity.

The invention discloses a three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material and a preparation method thereof. The preparation method comprises the following steps of adsorbing Mn<2+> ions onto a carbonyl (-COH-) group in a microgel three-dimensional macromolecular network by adopting poly(acrylamide, acrylic acid) microgel spheres as a template; increasing the pH value of the poly(acrylamide, acrylic acid) microgel spheres so as to in-situ hydrolyze the Mn<2+> ions to generate Mn(OH)2 crystal nucleus, depositing the Mn(OH)2 crystal nucleus into a space formed by the three-dimensional macromolecular network to form nano composite polymer microspheres; placing the obtained nano composite polymer microspheres into a tubular furnace to be calcined at a high temperature in an inert gas atmosphere to prepare the three-dimensional porous nanocarbon composite lithium manganate spherical positive electrode material. The positive electrode material has the advantages of excellent high-temperature cycling performance, large multiplying power charging-discharging performance and the like, and can be widely applied to the production of a lithium battery.

The invention discloses a quick-charging and safe low-temperature lithium ion battery and a manufacturing method thereof. The battery is prepared by putting a dry battery cell into a shell, injectingelectrolyte, forming, sealing and grading capacity, and the dry battery cell is formed by winding a positive plate, a ceramic diaphragm, a negative plate and a ceramic diaphragm. The positive/negativeelectrode active substance is secondary micron particles formed by primary nanoparticles, and the nanoscale particles can effectively shorten the migration distance of lithium ions and improve the migration speed of the lithium ions in the charging and discharging process of the battery. Meanwhile, the multiple tabs led out from the positive and negative plates of the dry battery cell are gathered and then are welded with the planar metal sheet current collector to form a full tab. The internal resistance and the temperature rise of the battery in the charging process are effectively reduced,the problem of high-rate quick charging of the battery is solved, the high-current charging and discharging performance of the battery is improved, and the safety stability and the low-temperature electrochemical performance of the battery are also improved.

The invention discloses a synthetic method for a cathode material nano lithium manganese phosphate for lithium ion batteries. The method comprises a step of dissolving phosphoric acid in deionized water to obtain a phosphoric acid solution, and adding PEG 400 under stirring to obtain a phosphoric acid/PEG 400 mixed solution; a step of dissolving lithium hydroxide in deionized water to obtain an aqueous solution of the lithium hydroxide, and adding the aqueous solution of the lithium hydroxide under stirring into the phosphoric acid/PEG 400 mixed solution to obtain a white emulsion; and a step of dissolving manganese sulfate in deionized water to prepare a manganese sulfate solution, adding the manganese sulfate solution under stirring into the white emulsion to obtain a precursor emulsion, adding the precursor emulsion in a microwave reactor to perform a microwave reaction at 140-180 DEG C for 5-20 min, and then centrifuging, washing and drying to obtain the cathode material nano lithium manganese phosphate for the lithium ion batteries. The synthetic method can effectively avoid particle agglomeration and products produced have uniform particle sizes, uniform shapes and stable charge-discharge properties.