Abstract: The present invention discloses a negative plate, a secondary battery including the negative plate, and an electric device. The negative plate of the present invention comprises a negative current collector and an anode active material layer. The anode active material layer comprising an anode active material. The negative plate satisfies the following relationship: ?1.75?lg(WAl×WS/?)?1.05, 0.2?lg(WS×R)+0.15×R?2.5, where WAl and WS are mass fractions of aluminum and sulfur respectively; ? is a contact angle of the anode active material layer with a mixed solvent of ethylene carbonate and methyl ethyl carbonate; and R is an ion transport impedance of the negative plate. When the negative plate of the present invention is applied to the secondary battery, cracking of the negative plate during charging and discharging can be significantly reduced, thereby improving the cycle performance of the battery and also improving the capacity retention rate of the battery during low-temperature cycling.

Abstract: The present invention discloses a negative electrode sheet, a secondary battery including the negative electrode sheet, and an electric device, and belongs to the technical field of batteries. The negative electrode sheet of the present invention includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer includes an negative electrode active material, the negative electrode sheet satisfies an equation as follows: 0.15?(F×ps)/(?×100)?10, where F is a cohesive force of the negative electrode sheet, in the unit of N/m; ps is a particle size change rate of the negative electrode active material, in the unit of %; and ? is a compaction density of the negative electrode sheet, in the unit of g/cm3.

Abstract: A negative plate, a secondary battery and an electrical device, which fall within the technical field of batteries, wherein the negative plate includes a negative current collector and an anode active material layer provided on a surface of the negative current collector, the anode active material layer includes an anode active material, the anode active material includes graphite, and the negative plate satisfies the following relationship: a=ln(DFW)+10×ln(DV50)+?(La)+26.5, b=PD, a/45?b?0.05. By reasonably controlling a particle diameter distribution of the anode active material in the negative plate, as well as a crystal size and a compacted density of the negative plate, the negative plate of the present disclosure maintains good wettability at a higher compacted density and has good liquid absorption capacity for an electrolyte solution, and a battery containing the negative plate has excellent cycle life.

Abstract: The disclosure discloses a negative electrode sheet, a secondary battery and an electrical device, belonging to the technical field of batteries. The negative electrode sheet of the disclosure includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector, in which the negative electrode active material layer includes a negative electrode active material, the negative electrode active material includes graphite, and the negative electrode sheet satisfies an equation as follows: 1.0×10?3?(|La1?La2|/Lax)/(VOI×DV50)?3.0×10?3.

Abstract: The disclosure relates to the field of lithium-ion batteries and discloses a ternary positive electrode active material in a form of particles, and an area of 1 nm to 1,000 nm in a direction from an outermost surface to a center in a cross-section of each of the particles is defined as an outer layer, and the rest in the cross-section of each of the particles is defined as an inner layer. The inner layer is doped with a first metal element M, the outer layer is doped with a second metal element N, and a valence state of the first metal element M is lower than a valence state of the second metal element N. The center of the ternary active material particles is doped with the first metal element M in a low-valence state.

Abstract: A negative electrode sheet and a battery applying the same are provided. The negative electrode sheet includes a current collector and a negative electrode active coating disposed on two opposite surfaces of the current collector. The negative electrode active coating contains a negative electrode active material, and the negative electrode active material includes graphite. The negative electrode sheet satisfies 0.0025??*?/PD?0.0065, where ? is a porosity of the negative electrode sheet, ? is a surface density of a single surface of the negative electrode sheet with a unit of g/cm2, and PD is a compacted density of the negative electrode sheet with a unit of g/cm3. The compacted density PD, the surface density ?, and the electrode sheet porosity ? of the negative electrode sheet form specific correlation relationships among one another.

Abstract: The invention provides a lithium-ion battery electrode piece and a lithium-ion battery including the same. The electrode piece includes an electrode active material layer disposed on the surface of the current collector and a protective layer disposed on the surface of the electrode active material layer. The protective layer is composed of metal oxide layers and conductive layers alternately stacked in the horizontal direction. The area ratio of the metal oxide layers to the conductive layers is 4:1-1:4, and the thickness ratio is 0.5:1-1:1. According to the invention, by regulating the shape and ratio of the high temperature stability material and the conductive active material on the electrode piece in the process of coating the protective layer, the amount of the two coating materials is precisely controlled to implement the precise regulation of the high temperature stability and rate performance of the electrode piece.

Abstract: A cathode material, containing a crystal with a superlattice structure, is provided. A chemical formula of the crystal is xLi2MO3.(1-x)LiNiaCobMn(1-a-b)O2, where 0<x?0.1, 0.8?a<1, b?0.1, and M is selected from one or more of Mn, Co, and Ni. A preparation method of the cathode material and a battery or a capacitor containing the cathode material are also provided.

Abstract: A silicon-graphite composite, a preparation method thereof, and a lithium battery anode and a lithium battery containing the silicon-graphite composite are provided in an embodiment of the disclosure. The silicon-graphite composite includes graphite and a silicon source fiber. The silicon source fiber is embedded in an interlayer structure of the graphite. The silicon-graphite composite is used as an anode material of the lithium battery in an embodiment of the disclosure.

Abstract: A cathode material, containing a crystal with a superlattice structure, is provided. A chemical formula of the crystal is xLi2MO3.(1-x)LiNiaCobMn(1-a-b)O2, where 0<x?0.1, 0.8?a<1, b?0.1, and M is selected from one or more of Mn, Co, and Ni. A preparation method of the cathode material and a battery or a capacitor containing the cathode material are also provided.

Abstract: A silicon-graphite composite, a preparation method thereof, and a lithium battery anode and a lithium battery containing the silicon-graphite composite are provided in an embodiment of the disclosure. The silicon-graphite composite includes graphite and a silicon source fiber. The silicon source fiber is embedded in an interlayer structure of the graphite. The silicon-graphite composite is used as an anode material of the lithium battery in an embodiment of the disclosure.

Abstract: A method of pre-controlling the shapes of a continuous-casting slab head and tail for reducing the cut amount of the head and tail of the hot rolling intermediate slab. The continuous-casting slab head and tail, is cut into a shape such that an end surface of the head concaves inwards and the tail projects outwards. The head and tail of a slab is cut in a curve that is symmetric to the center line in width thereof. Arc height, i.e. a maximum value of the concave amount at the head or that of the projection amount at the tail, is controlled within 0 mm-50 mm.

Abstract: The present invention relates to a method for producing hot rolled strip steel, especially the producing method of hot rolled strip steel with multiple target thicknesses in the longitudinal direction. It is a method to produce the strip steel with different target thicknesses in the longitudinal direction by using a hot continuous rolling mill. In this method, the first equal-thickness section of the strip steel is controlled with the conventional thickness control strategy, while other equal-thickness sections and the transition section between equal-thickness sections are controlled with the variable-thickness control strategy.

Abstract: The present invention relates to a method for producing hot rolled strip steel, especially the producing method of hot rolled strip steel with multiple target thicknesses in the longitudinal direction. It is a method to produce the strip steel with different target thicknesses in the longitudinal direction by using a hot continuous rolling mill. In this method, the first equal-thickness section of the strip steel is controlled with the conventional thickness control strategy, while other equal-thickness sections and the transition section between equal-thickness sections are controlled with the variable-thickness control strategy.

Abstract: A method of pre-controlling the shapes of a continuous-casting slab head and tail for reducing the cut amount of the head and tail of the hot rolling intermediate slab. The continuous-casting slab head and tail, is cut into a shape such that an end surface of the head concaves inwards and the tail projects outwards. The head and tail of a slab is cut in a curve that is symmetric to the center line in width thereof. Arc height, i.e. a maximum value of the concave amount at the head or that of the projection amount at the tail is controlled within 0 mm-50 mm.