4results about How to "Reduce disadvantages" patented technology

This invention relates to the field of battery technology, specifically to a composite negative electrode current collector, its preparation method, and its application. The composite negative electrode current collector of this invention includes a polymer material layer, a lithium replenishment layer, and a conductive metal layer. The lithium replenishment layer is located on at least one surface of the polymer material layer, and the conductive metal layer is located on the surface of the lithium replenishment layer away from the polymer material layer. The lithium replenishment layer includes a composite lithium material comprising a lithium metal core and a lithium compound coating layer covering the surface of the lithium metal core. The conductive metal layer has multiple through-hole structures. The composite negative electrode current collector of this invention, through the coordination of its various layer structures, is beneficial for improving the storage performance of the negative electrode, reducing battery impedance, shortening the electrolyte wetting time, enhancing lithium replenishment capacity, preventing the formation of lithium dendrites, and improving battery safety performance.

The present application relates to a kind of sintering method for reducing the CO content of sintering flue gas, by the reasonable cooperation of measures such as layer thickness, material distribution mode, flue gas reuse composite oxygen-enriched sintering and flue gas carbon monoxide catalytic oxidation in each step, the content of carbon monoxide in the emission flue gas is greatly reduced, so that the environmental friendliness of flue gas emission is greatly improved.

The invention relates to the technical field of oil-gas exploration and development, in particular to a gas well productivity evaluation method, device and equipment for a carbonate rock gas field. Comprising the following steps: drawing a relation chart between different coefficients by collecting historical data in special test wells of different types of carbonate gas field gas wells, classifying the carbonate gas field gas wells according to the drawn relation chart and different characteristics of reservoir stratums, and fitting coefficient relational expressions of the different types of gas field gas wells; and judging the type of the gas well to be subjected to productivity evaluation according to the logging data of the gas well to be subjected to productivity evaluation, and generating productivity evaluation of the gas well to be subjected to productivity evaluation. Therefore, on the premise that productivity well testing is not carried out, effective evaluation of the gas well productivity is achieved through an empirical formula and field test data, adverse factors of productivity well testing can be effectively reduced, and the coverage rate of gas well productivity evaluation is increased.

The application relates to the technical field of solar cells, and provides a back contact cell, a cell assembly and a photovoltaic system. A first polarity region of the back contact cell is stacked with a first tunneling layer and a first doped layer. The first tunneling layer comprises a first nitride layer. A plurality of holes are formed on the first tunneling layer. The surface of the first polarity region is a rough surface. The first polarity region has a plurality of first pyramid structures. The first pyramid structure has a first tower base inclined surface. The first tower base inclined surface comprises a first region, a second region and a third region arranged in sequence along the direction from the bottom of the first pyramid structure to the top of the first pyramid structure. The second region is located between the first region and the third region. The hole density of the part of the first tunneling layer located on the third region is greater than the hole density of the part of the first tunneling layer located on the second region. In this way, the Auger recombination loss increase in the body region can be reduced, the collection efficiency of carriers can be improved, and the defects in the silicon substrate can be reduced.