3results about How to "Reduced polarization effects" patented technology

The application discloses a bipolar square wave excitation generation and conductivity detection circuit, a direct current bias square wave generation circuit can generate direct current bias square wave excitation signals with different frequencies; a direct current bias generation circuit generates a direct current voltage excitation; the direct current bias of the direct current bias square wave is equivalent to the size of the direct current voltage, and two signals are superposed to form a bipolar square wave excitation signal. An internal reference voltage output by an ADC is used as a voltage source of the direct current bias square wave generation circuit and the direct current bias voltage generation circuit; a node voltage of an ADC acquisition circuit is collected, so that the conductivity and temperature of a medium to be measured are obtained. The excitation and detection mode provided by the application ensures that all circuit voltages are positive voltages, simplifies the structure of the excitation and sampling circuit, is high in measurement accuracy, stable in measurement, low in power consumption and capable of meeting long-term online monitoring requirements.

The application relates to a diaphragm and a preparation method thereof, a lithium ion battery and a power utilization device. The diaphragm comprises a base film, a lithium supplementing material and a coating. The base film has opposite first and second surfaces in the thickness direction thereof, the first surface has a convex structure, the convex structure has a through hole, the second surface has a recess on the surface opposite to the convex structure, the through hole and the recess are communicated, the inner diameter of the recess at the second surface is greater than the hole diameter of the through hole, the convex structure is multiple, and the multiple convex structures are arranged at intervals; the lithium supplementing material is located in the recess; and the coating is coated on the second surface and covers the recess. The diaphragm has the functions of liquid retention and lithium supplementing, can not only inhibit the capacity attenuation of the lithium ion battery but also reduce the falling risk of the lithium supplementing material.

This invention belongs to the field of battery cathode material technology, specifically relating to a high-rate manganese-based cathode material, its preparation method, and its application. The material, from the inside out, consists of a manganese-based active core, a mesoporous fast-ion conductor shell, and a pretreatment layer formed in situ from boron-containing compounds coated on the surface of the manganese-based active core. A functionalized carbon nanotube three-dimensional conductive network permeates the active core and shell. This invention achieves this by pretreating the manganese-based active core with boron-containing compounds in a liquid phase to form a surface pretreatment layer, sequentially oxidizing and functionalizing the carbon nanotubes and then lithium-modifying them to construct an embedded three-dimensional conductive network, followed by ball milling and ultrasonic dispersion to prepare a precursor sol and coating it to form a fast-ion conductor shell, and finally, template-assisted calcination to construct a mesoporous structure, thus obtaining a high-rate manganese-based cathode material. This invention effectively inhibits manganese ion dissolution and material structure collapse through multi-structure synergy, improving the high-rate performance and cycle stability of the material, and possesses good industrialization prospects.