Abstract: An ultrasonic transducer, a fingerprint recognition module, and an electronic device are provided, and belong to the field of ultrasonic detection technologies. The ultrasonic transducer includes a first electrode layer (01), a piezoelectric material layer (02), and a second electrode layer (03) that are sequentially stacked. The first electrode layer (01) includes a plurality of spaced first electrode blocks (011), the second electrode layer (03) includes a plurality of spaced second electrode blocks (031), and orthographic projection of each first electrode block (011) on the second electrode layer (03) overlaps at least one second electrode block (031). The first electrode layer (01) is disposed in a discretized manner, and a thickness of each first electrode block (011) is greater than a thickness threshold, so that a plurality of waveguide structures that can limit propagation paths of ultrasonic waves can be formed at the first electrode layer (01).

Abstract: This application discloses a secondary battery and an electric apparatus. The secondary battery includes a positive electrode plate, a negative electrode plate, an electrolyte, and a separator sandwiched between the positive electrode plate and the negative electrode plate. The positive electrode plate includes a positive electrode active material. The positive electrode active material includes LiFexM(1-x)PO4, where 0<x<1, and M includes at least one of Co, Mn, Ni, Mg, Zn, or Al. The electrolyte includes a lithium salt represented by the following formula (I). The secondary battery meets condition (aa), where C is a mass percentage of the lithium salt in the electrolyte, U is an upper-limit usage voltage of the secondary battery, and U0 is a stable voltage of the lithium salt.

Abstract: An electrolyte of this application includes a first additive represented by formula ( ) shown below, where R is selected from one or more of halogen and MO-, and M is selected from alkali metal. A battery includes the electrolyte, as well as an electric apparatus includes the battery.

Abstract: A battery cell includes an electrolyte, positive and negative electrode plates, and a separator provided between the positive and negative electrode plates. The electrolyte includes a lithium salt including lithium hexafluorophosphate, a mass percentage of which with respect to a total mass of the electrolyte ranges from 15% to 20%. The positive/negative electrode plate includes a positive/negative electrode current collector and a positive/negative electrode film layer provided on at least one side of the positive/negative electrode current collector and containing a positive/negative electrode active material. The negative electrode active material contains carbon and silicon. A mass percentage of silicon with respect to a total mass of the negative electrode active material is greater than or equal to 0.3% and less than or equal to 3.0%.

Abstract: A lithium-ion battery includes a positive electrode and an electrolyte. A positive electrode active material included in the positive electrode includes a doping element. The doping element includes at least one selected from W, Cu, Fe, V, Cr, Ti, Zr, Zn, Al, In, Ta, Y, La, Sr, Ga, Sc, Gd, Sm, Ca, Ce, Nb, Mg, B, and Mo, and a percentage of the doping element satisfies 0.01%?W1%?0.5%. The electrolyte includes an oligomer according to formula (I), and a percentage of the oligomer satisfies 0.1%?W2?10% s.

Abstract: A lithium-ion battery and an electric apparatus are disclosed. The lithium-ion battery includes: a positive electrode plate, a negative electrode plate, a separator, and an electrolyte. The separator is located between the positive electrode plate and the negative electrode plate. When the lithium-ion battery is charged at 1C to a state of charge of 80% SOC, a potential Panode of a negative electrode satisfies: 0.09 V (vs. Li+/Li)<Panode<0.15 V (vs. Li+/Li).

Abstract: The present application provides a positive electrode active material, a method for the preparation thereof, and a secondary battery and an electrical device. The positive electrode active material includes a positive electrode active material matrix and a protective layer arranged on the surface of the positive electrode active material matrix and containing perfluoropolyether with a number average molecular weight of 200 to 16000. The secondary battery has high energy density and good dynamic performance, as well as good high-temperature cycling performance and high-temperature storage performance.

Abstract: A battery cell includes a housing, an electrode assembly, and an electrolyte solution. An accommodation cavity is formed in the housing. The electrode assembly is disposed in the accommodation cavity. The electrolyte solution is disposed in the accommodation cavity. An electrolyte retention coefficient a falls within a value range of 1.4 g/Ah to 2.97 g/Ah, and a packing fraction b of the battery cell falls within a value range of 80% to 99%.

Abstract: The present disclosure relates to display devices and imaging control methods of a display device. One example display device includes a display, a lens assembly, a driver, and a controller. The controller is configured to convert a first image into n consecutive second images, and generate a drive signal used to control the driver to move, where an image resolution of the second image is less than an image resolution of the first image, a refresh rate of the second image is greater than a refresh rate of the first image, and n?2. The driver is configured to drive, under control of the drive signal, at least one optical element or the display connected to the driver to move to adjust a display location of the second image displayed by the display, so that the n consecutive second images are displayed at n different locations.

Abstract: This application relates to a lithium-ion battery, including a positive electrode, a negative electrode, and an electrolyte, where the negative electrode includes a negative electrode current collector and a negative electrode active material layer containing a negative electrode active material attached to at least one surface of the negative electrode current collector, where an average width-to-length ratio of particles of the negative electrode active material is 0.1-1; an ionic conductivity of the electrolyte is 7-15 mS/cm; and a negative electrode lithiation capacity to positive electrode delithiation capacity ratio CB is 1.05-1.5. An electric apparatus including such lithium-ion battery is also disclosed. The lithium-ion battery has a large-rate fast charging capability and good cycling performance.

Abstract: A battery cell includes an electrolyte, positive and negative electrode plates, and a separator between the positive and negative electrode plates. The electrolyte includes a lithium salt including lithium hexafluorophosphate, a mass percentage of which with respect to a total mass of the electrolyte ranges from 15% to 20%. The positive/negative electrode plate includes a positive/negative electrode current collector and a positive/negative electrode film layer provided on at least one side of the positive/negative electrode current collector and containing a positive/negative electrode active material. The negative electrode active material includes a carbon-based material and a silicon-carbon composite. A mass percentage of silicon in the silicon-carbon composite with respect to a total mass of the negative electrode active material is greater than or equal to 0.3% and less than or equal to 10.0%.

Abstract: A battery cell includes an electrolyte, positive and negative electrode plates, and a separator provided between the positive and negative electrode plates. The electrolyte includes a lithium salt including lithium hexafluorophosphate, a mass percentage of which with respect to a total mass of the electrolyte ranges from 15% to 20%. The positive/negative electrode plate includes a positive/negative electrode current collector and a positive/negative electrode film layer provided on at least one side of the positive/negative electrode current collector and containing a positive/negative electrode active material. The negative electrode active material contains carbon and silicon. A mass percentage of silicon with respect to a total mass of the negative electrode active material is greater than or equal to 0.3% and less than or equal to 3.0%.

Abstract: A display circuit includes a plurality of current source branches and a plurality of pixel branches. Each current source branch includes a first transistor and a control circuit. Each pixel branch includes a second transistor, a pulse width control switch transistor, and a pixel unit that are connected in series. The turned-on first transistor and the turned-on second transistor form a current mirror structure. In the current mirror structure, there is a proportional relationship between a current flowing through each of the plurality of first transistors and a current flowing through the turned-on second transistor. Whether each first transistor is turned on is controlled through the control circuit, to adjust a value of the current flowing through each pixel unit through the second transistor.

Abstract: A battery cell includes a housing, an electrode assembly, and an electrolyte solution. An accommodation cavity is formed in the housing. The electrode assembly is disposed in the accommodation cavity. The electrolyte solution is disposed in the accommodation cavity. An electrolyte retention coefficient a and a packing fraction b of the battery cell satisfy the following relationship: 2?a/b?3, and the electrolyte retention coefficient a is in units of g/Ah.

Abstract: An electrolyte includes a first additive having a chemical formula of R((CH3)mSi)n, where R includes at least one of phosphate ester group, phosphite group, borate group, amine group, isocyanate group, fluorine atoms, oxygen atoms, and sulfur atoms, m is 1, 2, or 3, and n is 1, 2, or 3.

Abstract: The present application relates to a lithium ion battery and a power consuming device, the lithium ion battery comprising a positive electrode, a negative electrode and an electrolyte solution, wherein the electrolyte solution has a viscosity c of 1-6 mPa·s at 25° C., as measured in accordance with GB/T10247-2008; and the ratio CB of the lithium intercalation capacity of the negative electrode to the delithiation capacity of the positive electrode is 1.05-1.5. The lithium ion battery has high-rate fast charging capability and good cycling performance.

Abstract: Provided are a secondary battery and a method of preparing the secondary battery. The secondary battery includes a positive electrode plate and an electrolytic solution, wherein the positive electrode plate includes a positive electrode current collector and a positive electrode film layer provided on at least one surface of the positive electrode current collector, the positive electrode film layer has a porosity of P, the electrolytic solution includes a dehydrating additive, and based on a total mass of the electrolytic solution, a mass percentage of the dehydrating additive in the electrolytic solution is a, and the secondary battery satisfies: 0.2?(a*100)/P?3.5. The secondary battery of the present application has improved initial direct current resistance (DCR) and high temperature cycle performance while having an improved porosity to balance high energy density and good dynamics.

Abstract: Provided are a secondary battery, a battery module, a battery pack and an electric device. The secondary battery includes an electrode assembly and an electrolytic solution configured to infiltrate the electrode assembly, wherein the electrode assembly includes a negative electrode plate, a separation film and a positive electrode plate, and the negative electrode plate includes a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector; and by setting a tortuosity of the negative electrode plate as ?, the ? satisfies Formula I below: ?=0.5(?)????Formula I where, ? is a porosity of the negative electrode material layer, and ? is a Bruggeman index of the negative electrode material layer, and the ? and a conductivity ? of the electrolytic solution satisfy Formula II below: (2?)0.5+6???(2?)0.5+10??Formula II. Therefore, the secondary battery has an excellent fast-charging performance.

Abstract: Provided a battery, a method for preparation thereof and an electrical device containing the same, wherein the battery includes a positive electrode plate and an electrolytic solution, the positive electrode plate including a positive electrode current collector and the positive electrode current collector including a conductive layer, and the electrolytic solution includes a first anion and a second anion, the first anion includes an anion selected from hexafluorophosphate anions, the second anion includes one ore more selected from anions shown in Formula 1 and an anion shown in Formula 2. The present application can improve the safety performance of the battery while enabling the battery to have good electrochemical performance.

Abstract: This application relates to the field of AR technologies, and in particular, to AR glasses and an AR glasses system. The AR glasses further include an optical receiver/transmitter, a light propagation medium, a power supply apparatus, and a photovoltaic apparatus. The optical receiver/transmitter is configured to emit light. The optical receiver/transmitter is disposed on a frame. The light propagation medium is configured to guide propagation of the light emitted by the optical receiver/transmitter, and the light propagation medium is disposed on an eyeglass. The power supply apparatus is configured to provide electric energy for the AR glasses. The photovoltaic apparatus is configured to absorb light that does not enter the light propagation medium, and convert light energy into electric energy. The photovoltaic apparatus is electrically connected to the power supply apparatus, and the electric energy generated by the photovoltaic apparatus is transmitted to the power supply apparatus.