Abstract: A negative electrode material includes silicon monoxide particles. A molar ratio A of oxygen to silicon on a surface of the silicon monoxide particle is greater than a molar ratio B of oxygen to silicon inside the silicon monoxide particle, so that the molar ratio A of oxygen to silicon on the surface of the silicon monoxide particle and a molar ratio B of oxygen to silicon at any point above 25 nm from the surface of the silicon monoxide particle satisfy A/B > 1.5, allowing the electrochemical apparatus to have a smaller volume swelling and better cycling performance during charge and discharge cycles.

Abstract: A negative electrode material including a silicon compound SiOx, a first conductive layer, and a second conductive layer; where 0.5?x?1.5; at least part of the first conductive layer is present between the silicon compound and the second conductive layer; and the first conductive layer includes graphene, and the second conductive layer includes carbon nanotubes. This application further provides a negative electrode material different from the above negative electrode material in that the first conductive layer includes carbon nanotubes and the second conductive layer includes graphene. An electrochemical apparatus having the negative electrode material combines the advantages of graphene and carbon nanotubes, to obtain long cycle life and low swelling rate.

Abstract: A negative electrode plate includes: a current collector; and an active material layer, located on the current collector. The active material layer includes a silicon-based material, a carbon material, and a binder. Silicon mass fractions in two places of the active material layer are X1 and X2; the two places cover a same area but are located in different positions, X2?X1, M=X1/X2, and M?0.7. Lithium mass fractions in the two places are Y1 and Y2, respectively; the two places cover the same area but are located in different positions, Y2?Y1, N=Y1/Y2, and N?0.5.

Abstract: A silicon-carbon composite particle includes a silicon-based particle and a plurality of graphite particles on surface of the silicon-based particle, where the graphite particles have a particle size of M ?m, the silicon-based particle has a particle size of N ?m, M<N, and 2<N?10. Also, a preparation method of silicon-carbon composite particle. A lithium-ion battery prepared using the active material containing the silicon-carbon composite particles as the negative electrode has good cycling performance and low swelling rate.

Abstract: A negative electrode material includes a composite of a silicon-based material (1), a polymer (2), and carbon nanotubes (3), where the polymer (2) contains a first group and a second group, the first group is chemically bonded to the carbon nanotubes (3), and the second group is chemically bonded to the silicon-based material (1). Both the carbon nanotubes (3) and the polymer (2) containing two groups are applied to surfaces of particles of the silicon-based material (1). The two groups of the polymer (2) are chemically bonded to the silicon-based material (1) and the carbon nanotubes (3) respectively, so that bonding force between the silicon-based material (1) and the carbon nanotubes (3) is enhanced and a uniform carbon nanotube (3) coating layer is formed. This can significantly improve conductive performance of the silicon-based material (1), thereby improving cycling performance and rate performance of an electrochemical apparatus.

Abstract: A negative electrode plate includes a current collector and an active substance layer provided on the current collector, where the active substance layer includes a silicon-based material, and a proportion by mass of element silicon in the active substance layer has a minimum value X1 and a maximum value X2 among different locations of a same area size, where a value of X1/X2 is M, and M?0.7; and a weight loss rate of the active substance layer under thermogravimetric (TG) analysis within 800° C. has a minimum value Y1 and a maximum value Y2 among different locations of a same area size, where a value of Y1/Y2 is N, and N?0.7. In this disclosure, the silicon-based material and a binder in the active substance layer are uniformly dispersed, improving C-rate performance and cycling performance of the electrochemical apparatus and reducing swelling of an electrode assembly.

Abstract: A lithium-ion battery, including a battery cell, an electrolytic solution, and a packaging film. The battery cell is formed by winding a positive electrode plate and a negative electrode plate that are separated by a separator. The lithium-ion battery is half-charged to obtain a half-charged full battery. The half-charged full battery is stripped of the packaging film to obtain a half-charged cell. When a width of the half-charged full battery is w1, a width of the half-charged cell is w2, and g=w2/w1, the following conditional expression (1) is satisfied: 0.4<g<0.997. A negative active material of the negative electrode plate includes a silicon-based material. When a capacity per unit volume of the negative electrode plate is a, a and g satisfy the following conditional expression (2): 420 mAh/cm3<g×a<2300 mAh/cm3, where 619 mAh/cm3<a<3620 mAh/cm3. The present invention further provides an electronic device.

Abstract: An anode material, including a matrix material, and the matrix material comprises carbon-doped silicon monoxide, and a content of the carbon ranges from 0.5% to 10% based on a total mass of the carbon and silicon monoxide. The anode material can significantly improve the cycle performance of an electrochemical device at room temperature and high temperature.

Abstract: A negative electrode material includes silicon-based particles. The silicon-based particles include a silicon-containing matrix and a polymer layer disposed on at least a portion of a surface of the silicon-containing matrix, and the polymer layer includes a carbon material and a polymer; when a thermogravimetric analysis is conducted at a temperature ranging from 0° C. to 800° C., a derivative thermogravimetric curve of the polymer in a free state has at least one characteristic peak, a temperature at the maximum characteristic peak of the at least one characteristic peak is Ti, a derivative thermogravimetric curve of the silicon-based particles has at least one characteristic peak, a temperature at the maximum characteristic peak of the at least one characteristic peak is T2, and T1-T2 is from 1.5° C. to 20° C. A lithium-ion battery prepared from the negative active material has improved cycle performance and deformation resistance, and reduced DC resistance.

Abstract: A negative electrode includes a current collector and a coating located on the current collector. The coating includes silicon-based particles and graphite particles. The silicon-based particles include a silicon-containing substrate and a polymer layer. The polymer layer includes a polymer and carbon nanotubes. The polymer layer is located on at least a part of a surface of the silicon-containing substrate. A minimum value of film resistances at different positions on a surface of the coating is R1, a maximum value of the film resistances is R2, an R1/R2 ratio is M, and a percentage of a weight of the silicon-based particles in a total weight of the silicon-based particles and the graphite particles is N, where M?0.5, and N is 2 wt %-80 wt %.

Abstract: An anode material includes silicon-based particles, the silicon-based particles include a silicon-containing substrate, at least a part of the surface of the silicon-containing substrate has: (i) a polymer layer, and/or (ii) an amorphous carbon layer, and the polymer layer or the amorphous carbon layer includes carbon nanotubes, the silicon-based particles include metal elements, the metal elements include Fe, Cu, Zn, Ni, Co, or any combination thereof; wherein the content of the metal elements selected from Fe, Cu, Zn, Ni, Co, or any combination thereof is less than about 2500 ppm based on the total weight of the silicon-based particles. A lithium ion battery with the anode active material has a reduced impedance and K value, and improved first efficiency and cycle performance.

Abstract: A negative electrode material includes silicon-based particles. The silicon-based particles include a silicon-containing substrate and a polymer layer. The polymer layer exists on at least a part of a surface of the silicon-containing substrate. The polymer layer includes carbon nanotubes and alkali metal ions. The alkali metal ions include Li+, Na+, K+, or any combination thereof. Based on a total weight of the silicon-based particles, a content of the alkali metal ions is approximately 50˜5,000 ppm. A lithium-ion battery prepared by using the negative active material achieves a lower resistance, higher first-time efficiency, higher cycle performance, and higher rate performance.

Abstract: An anode material includes silicon-containing particles including a silicon composite substrate and a polymer layer, the polymer layer coats at least a portion of the silicon composite substrate, wherein the polymer layer includes a carbon material. The anode material has good cycle performance, and the battery prepared with the anode material has better rate performance and lower expansion rate.

Abstract: A negative electrode composite material includes a Si—M—C composite material. A conductive layer exists on a surface of the Si—M—C composite material, M includes at least one of boron, nitrogen, or oxygen. Chemical shifts of a silicon element in the Si—M?C composite material as measured in a solid-state nuclear magnetic resonance test include ?5 ppm±5 ppm, ?35 ppm±5 ppm, ?75 ppm±5 ppm, ?110 ppm±5 ppm. A peak width at half height at ?5 ppm±5 ppm is K, and K satisfies: 7 ppm<K<28 ppm. The negative electrode composite material exhibits a relatively low expansion rate and a relatively high conductivity.

Abstract: An anode material includes a silicon composite substrate, wherein the Dv50 of the silicon composite substrate is from 2.5 ?m to 15 ?m, and the particle size distribution of the silicon composite substrate meets 0.1?Dn10/Dv50?0.6. The anode material has good cycle performance, and the battery prepared with the anode material has good rate performance and lower swelling rate.

Abstract: The present application relates to an anode material, and an electrochemical device and an electronic device using the same. The anode material of the present application includes: a silicon compound SiOx, where x is 0.5-1.5; an oxide MeOy layer, the MeOy layer coating at least a portion of the silicon compound SiOx, where Me includes at least one of Al, Si, Ti, Mn, V, Cr, Co or Zr, where y is 0.5-3; and a carbon nanotube layer, the carbon nanotube layer coating at least a portion of the MeOy layer. The anode material can significantly enhance the cycle performance and rate performance of the electrochemical device, and significantly reduce the impedance of the electrochemical device.

Abstract: An anode material includes a lithiated silicon oxide material, an inorganic coating layer, and a polymer coating layer, wherein the inorganic coating layer and the lithiated silicon oxide material at least have Si—O-M bonds therebetween, and M includes at least one of an aluminum element, a boron element, and a phosphorus element. The anode material has high water stability, high first coulombic efficiency, and good cycle stability.

Abstract: An anode material includes silicon-containing particles including a silicon composite substrate and an oxide MeOy layer, wherein the oxide MeOy layer is coated on at least a portion of the silicon composite substrate, wherein Me includes at least one of Al, Si, Ti, Mn, V, Cr, Co or Zr, and y is 0.5 to 3; and wherein the oxide MeOy layer includes a carbon material. The anode material has good cycle performance, and the battery prepared from the anode material has better rate performance and lower swelling rate.

Abstract: An anode material includes a silicon composite substrate. In the X-ray diffraction pattern of the anode material, the highest intensity at 2? within the range of 28.0° to 29.0° is I2, and the highest intensity at 2? within the range of 20.5° to 21.5° is I1, wherein 0<I2/I1?1. The anode material has good cycle performance, and the battery prepared with the anode material has better rate performance and a lower swelling rate.

Abstract: An anode material includes a silicon compound SiOx, where x is about 0.5 to 1.5; an oxide MeOy layer, the MeOy layer coating the silicon compound SiOx, where y is about 0.5 to 3; and a carbon layer, the carbon layer coating the MeOy layer. Me includes at least one of Al, Si, Ti, Mn, V, Cr, Co, and Zr. The surface of the MeOy layer adjacent to the carbon layer has an open pore structure, and at least part of the open pore structure is filled with the carbon layer. The anode material improves the cycle performance of the electrochemical device and significantly reduce the impedance of the electrochemical device.