Abstract: A positive electrode material, a preparation method therefor, and an application thereof are disclosed. The cathode material is composed of secondary particles agglomerated by primary particles; wherein individual secondary particle contains an inner core structure, a middle layer, and a shell layer, in this order, along a direction from a center to a surface of the secondary particle; wherein the middle layer is distributed in a circular ring shape; and wherein the secondary particle has a structure of close packing of an inner core structure, loose and porous middle layer, and close packing of the shell layer.

Abstract: Disclosed are a surface-coated positive electrode material and a preparation method therefor, and a lithium ion battery. The surface-coated cathode material contains a substrate and a coating layer coated on a surface of the substrate, and the coating layer has a bimodal distribution of characteristic peaks at 31°-35° of 2? tested by X-Ray Diffraction (XRD); and a ratio Ib/Ia of a peak intensity Ib of a secondary peak to a peak intensity Ia of a primary peak in a bimodal distribution is within a range of 0.8-1, preferably within a range of 0.97-1.

Abstract: The present disclosure relates to the technical field of lithium ion battery, and discloses a Lithium-Manganese-rich material and a preparation method and a use thereof.

Abstract: A delivery guidewire (100), comprising: a core wire (110) comprising a first segment (111), a second segment (112) and a third segment (113), which are arranged in sequence and have diameters decreasing in the direction from a distal end to a proximal end of the delivery guidewire (100); a metal ring (130) at least partially disposed at a proximal end of the first segment (111); and a spring (120) at least partially disposed over the outer side of the second segment (112). A distal end of the spring (120) abuts against a proximal end of the metal ring (130), and a distal section of the spring (120) has a diameter smaller than a diameter of a proximal section thereof. The diameter of the distal section of the spring (120) that is smaller than the diameter of the proximal section of the spring (120) results in a smaller clearance between the distal section of the spring (120) and the core wire (110), which enables greater concentricity of the distal section of the spring (120) with the core wire (110).

Abstract: A single crystal multi-element positive electrode material and a preparation method therefor, and a lithium ion battery. The ratio of the length of the longest diagonal line to the length of the shortest diagonal line of the single crystal particles of the single crystal multi-element positive electrode material measured by an SEM is roundness R, and R?1; and D10, D50 and D90 of the single crystal particles of the single crystal multi-element positive electrode material satisfy: K90=(D90?D10)/D50, and the product of K90 and R is 1.20-1.40. The single crystal multi-element positive electrode material is more round and regular in morphology, the single crystal particles have uniform size, less agglomeration and less adhesion. The material has the characteristics of high compaction density, good rate capability and excellent cycle performance.

Abstract: Provided is a positive electrode material for a lithium ion battery, having the following general formula I: Li1+aNixCoyMnzMcM?dO2?bAb general formula I, wherein ?0.05?a?0.3, 0.8?x?1, 0?y?0.2, 0?z?0.2, 0?c?0.01, 0?d?0.01, x+y+z+c+d=1, and 0?b?0.05; M and M? are different from each other and each independently selected from at least one of La, Cr, Mo, Ca, Fe, Ti, Zn, Y. Zr, W, Nb, V, Mg, B, Al, Sr, Ba and Ta, A is selected from at least one of F, Cl, Br, I and S, and the number of crystallite boundaries N in primary particles of the positive electrode material is from 10.5 to 14.5, wherein N is calculated according to Equation I: N=DS/DX Equation I, wherein DS is an average size of the primary particles, as measured from scanning electron microscope (SEM) image of cross section of the positive electrode material, and DX is an average size of crystallites in the primary particles of the positive electrode material, as measured by an XRD test and calculated by the Scherrer equation.

Abstract: A positive electrode material for a lithium ion battery and a preparation method therefor, and a lithium ion battery, relating to the technical field of secondary batteries. The positive electrode material comprises a high-nickel multi-element positive electrode material, the high-nickel multi-element positive electrode material is formed by agglomerating multiple primary grains, and the primary grains are distributed in a divergent shape along the diameter direction of the high-nickel multi-element positive electrode material, the aspect ratio L/R of the primary grains in the positive electrode material is greater than or equal to 3, and the radial distribution ratio of the primary grains in the positive electrode material is greater than or equal to 60%. The lithium ion battery containing the positive electrode material has high capacity and greatly improved particle strength.

Abstract: The present disclosure relates to the technical field of positive electrode materials of lithium ion batteries. Disclosed a positive electrode material having a multi-cavity structure and a preparation method therefor, and a lithium ion battery. The positive electrode material is formed by aggregation of a plurality of primary particles, and some of the primary particles grow in an oriented manner to form supporting structures, the supporting structures overlapping each other inside the positive electrode material to form a plurality of cavities. The particle strength of the positive electrode material is significantly improved, so that the positive electrode material has the advantage of a long service life. In addition, the impedance of the positive electrode material is reduced, thereby improving the power performance of the positive electrode material.

Abstract: The present invention relates to the field of lithium ion battery positive electrode materials, and discloses a positive electrode material, a preparation method therefor, a use thereof, and a lithium ion battery.

Abstract: An iron manganese phosphate precursor, a lithium iron manganese phosphate positive electrode material and a method for preparation thereof, an electrode material, an electrode, and a lithium-ion battery are disclosed. The lithium iron manganese phosphate precursor is represented by (NH4)Mn1-x-yFexMyPO4H2O/C, wherein 0.1<x?0.6 and 0?y?0.04, and M is selected from at least one of Mg, Co, Ni, Cu, Zn, and Ti. Lithium iron manganese phosphate positive electrode material prepared from the precursor is uniform in carbon coating, has a dense secondary spherical morphology, is high in compaction density, can improve the electrochemical performance of the lithium-ion battery when applied to the lithium-ion battery, is high in specific capacity and good in cycle performance.

Abstract: The present disclosure relates to the technical field of secondary battery, and discloses a positive electrode material and a preparation method and use therefor, a lithium-ion battery positive electrode poly piece, and a lithium-ion battery.

Abstract: A container including a plurality of material bands each having a thickness that is less than adjacent areas of the container, the plurality of material bands extending along a base and a body of the container. The plurality of material bands are configured as folding points of the container. The container is configured to collapse along the plurality of material bands such that at least two dimensions of the container are 5 cm or greater. The base is configured to collapse along the plurality of material bands to have a generally flat body and a generally flat base that is 1.4 times wider than a pre-collapsed diameter of the base.

Abstract: The present disclosure relates to the technical field of secondary battery, and discloses a positive electrode material and a preparation method and use therefor, a lithium-ion battery positive electrode poly piece, and a lithium-ion battery.

Abstract: A single-crystal-type multi-element positive electrode material, and a preparation method therefor and an application thereof.

Abstract: The present disclosure relates to the technical field of lithium ion batteries. Disclosed are a multi-element positive electrode material, and a preparation method therefor and the application thereof.

Abstract: A supercritical carbon dioxide state monitoring and control system based on infrared spectrum characteristic analysis. The system includes: a test section for carbon dioxide to pass through; an infrared light source emitting a detection beam to the carbon dioxide passing through the test section; an infrared spectrometer receiving and analyzing the detection beam passing through the carbon dioxide; and a pressure control module controlling pressure of the carbon dioxide at a set value. In addition, the system also includes a temperature control module capable of monitoring and adjusting temperature of the supercritical carbon dioxide. The supercritical carbon dioxide state monitoring and control system may monitor and control a state of the carbon dioxide at an inlet of an apparatus under an actual operation condition in a Brayton cycle system, which improves working performance of the apparatus in the Brayton cycle system, thereby improving overall efficiency of the Brayton cycle system.

Abstract: A positive electrode material for a lithium ion battery and a preparation method therefor, and a lithium ion battery, relating to the technical field of secondary batteries. The positive electrode material comprises a high-nickel multi-element positive electrode material, the high-nickel multi-element positive electrode material is formed by agglomerating multiple primary grains, and the primary grains are distributed in a divergent shape along the diameter direction of the high-nickel multi-element positive electrode material, the aspect ratio L/R of the primary grains in the positive electrode material is greater than or equal to 3, and the radial distribution ratio of the primary grains in the positive electrode material is greater than or equal to 60%. The lithium ion battery containing the positive electrode material has high capacity and greatly improved particle strength.

Abstract: An electric toothbrush replacement head is provided and includes a replacement head handle; an opening disposed on an end of the replacement head handle; a transmission connecting part disposed in the opening; at least one through-groove disposed on an edge of the transmission connecting part; a transmission directional elongated groove disposed in the transmission connecting part; reinforced ribs disposed between the transmission connecting part and a portion where the replacement head handle is provided with the opening. The electric toothbrush replacement head with a reasonable structure is easy to replace and stable for using. Furthermore, the electric toothbrush replacement head is convenient, safe and reliable, which can also eliminate motor noise.