39results about How to "Small performance degradation" patented technology

The invention provides a negative electrode material, a preparation method and application thereof. The negative electrode material includes an inner core, a first carbon coating layer coated on the surface of the inner core, and a second carbon coating layer located on the outermost layer; wherein, the inner core is an amorphous lithium-silicon alloy, and the amorphous The chemical formula of lithium silicon alloy is Li x Si, 1<x≤4.4. In the present invention, double-layer carbon coating is carried out on the surface of the lithium-silicon alloy, so that the performance of the lithium-silicon alloy core is hardly attenuated in dry air, and the negative electrode material can have better environmental stability and cycle stability.

The embodiment of the invention discloses a method for controlling refrigerant flow in an air conditioning system. The method includes: in cooling mode, adjusting the opening degree of the first expansion valve according to the initial opening degree of the first expansion valve and the attainment degree of the intermediate pressure of the compressor, and adjusting the opening degree of the second expansion valve according to the initial opening degree of the second expansion valve Adjust the opening degree of the second expansion valve according to the suction superheat degree; in the heating mode, adjust the second expansion valve according to the initial opening degree of the second expansion valve, the external environment temperature and the attainment degree of the intermediate pressure of the compressor the opening degree of the valve, and adjust the opening degree of the first expansion valve according to the initial opening degree of the first expansion valve and the suction superheat degree. Through the technical solutions provided by the embodiments of the present invention, the precise control of the refrigerant flow rate is realized, so that the air conditioning system still has high performance under the two working conditions of high-temperature cooling and low-temperature heating, and reduces performance attenuation caused by ambient temperature changes.

The invention relates to an aluminum alloy for an automobile door sill beam and a preparation method thereof. The method comprises the steps of: (1) adding an aluminum-copper alloy, an aluminum-silicon alloy, magnesium ingots and a manganese agent in the process of smelting molten aluminum; the final aluminum The mass percentage of the added elements in the rod meets: magnesium 0.90-1.10wt%, silicon 0.90-1.10%, manganese 0.50-0.80%, copper 0.20-0.40%; (2) filtering molten aluminum; (3) continuous casting through the casting system , casting aluminum rods; (4) Transfer the aluminum rods to a homogenizing furnace for homogenization, the conditions are 550-570 ° C, 8-12H heat preservation, wind and mist cooling; (5) sawing the aluminum rods to obtain extruded The short stick used. The present invention increases the content of Cu by adjusting the magnesium-silicon ratio, while further improving product performance, and at the same time ensures that the attenuation rate can be lower during post-baking, and the properties of the prepared aluminum alloy can meet the requirements in different states.

The invention relates to noncausal effective learning control system and method, and belongs to the technical field of control over precision motion control systems, and the system and the method are used for solving the problem that the working efficiency of the system is low due to the long dynamic regulation time of the precision motion control system. The control system comprises a control object P, a noncausal learning control law module, an effective learning function f (t, e) module, a memorizer M and a feedback control law C module, wherein the noncausal learning control law module is composed of a time delay factor zd module, a causal learning law L module and a filter Q. The control method comprises the following steps of: carrying out preliminary shaping on the learning control system by adopting the time delay factor, confirming d according to the bandwidth of a feedback system composed of P and C and then confirming the low band range meeting the convergence requirements; and shaping the high band parts through the causal learning law L module and the filter Q to enable the high band parts to meet the convergence requirements. The control system and the control method which are disclosed by the invention are suitable for the control over the precision motion control system.

The invention relates to the technical field of lithium batteries, in particular to a separator for lithium metal batteries and a preparation method thereof. A diaphragm for lithium metal batteries, comprising a diaphragm body, at least one side of the diaphragm body is coated with a piezoelectric ceramic layer with piezoelectric properties, and the side of the diaphragm body coated with the piezoelectric ceramic layer faces the negative electrode of the lithium metal battery, The electroceramic layer is composed of conductive agent, binder and piezoelectric ceramic particles. A separator for a lithium metal battery of the present invention can enable uniform deposition of lithium ions during the reaction process, and the uniformly precipitated lithium has a smaller surface area than dendritic lithium, which can reduce side reactions and slow down the performance decay of lithium batteries. Moreover, the uniformly deposited lithium will not pierce the separator and cause a short circuit, which improves the safety of the battery.

The embodiment of the present invention discloses an organic light emitting diode, a display panel, and a display device. The organic light emitting diode includes: a first electrode, a second electrode, a light emitting layer, and at least one barrier layer; the first electrode is arranged opposite to the second electrode The light-emitting layer is located between the first electrode and the second electrode; the barrier layer is located between the light-emitting layer and the second electrode, and / or the barrier layer is located between the light-emitting layer and the first electrode; wherein, the same barrier layer includes At least two kinds of barrier materials, and the electron mobility of at least one barrier material is lower than a first preset value, the electron mobility of at least another barrier material is higher than a second preset value, and the first preset value is lower than Second default value. The technical solution provided by the embodiments of the present invention can control the injection amount of electrons and holes, thereby balancing the number of electrons and holes in the light-emitting layer, reducing the damage of excess electrons to the film layer material and interface, and improving the efficiency of organic light-emitting diodes. life.