Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15.

Abstract: A composite material includes a graphite particle. A surface of the graphite particle is provided with a first region and a second region. The first region is made of graphite, and the second region includes a hard carbon layer. A surface area of the first region is denoted as A1 ?m2, and a surface area of the second region is denoted as A2 ?m2, 0?A1/A2?9. A thickness of the hard carbon layer is H nm, 5?H?500. By controlling the coating amount and coating area of the hard carbon to satisfy the above relationship, this application can improve energy density, capacity performance, and the like at the same time of enhancing dynamic performance.

Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by means of X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15. The negative active material according to this application can significantly improve an energy density, cycle performance, and rate performance of the electrochemical device.

Abstract: A negative electrode includes a current collector and a negative active material layer disposed on the current collector. The negative active material layer includes negative active material particles. The negative active material particles include secondary particles. The negative active material layer includes a pore A. A diameter of the pore A is 59 nm to 73 nm when tested by a mercury intrusion porosimetry. A ratio C004/C110 of the negative active material layer is 6 to 20. The electrochemical device using the negative electrode according to this application possesses a relatively high capacity and improved performance of resistance to cycle expansion.

Abstract: An electrochemical apparatus includes a positive electrode plate, a negative electrode plate, and a separator disposed between the positive electrode plate and the negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active substance layer disposed on the negative electrode current collector, where the electrochemical apparatus has a first capacity a in the unit of mAh, the first capacity a is greater than 0, and the first capacity a represents a capacity when a battery that is prepared using the negative electrode plate and a lithium plate as a counter electrode of the negative electrode plate is charged to 2.0 V after the electrochemical apparatus has been discharged from a 100% state of charge (SOC) to 2.5 V.

Abstract: A negative active material includes composite particles. The composite particle includes a first region and a second region, where the first region includes a disordered carbon structure, and the second region includes an ordered carbon structure and/or a metal oxide structure. The negative active material of this application has a high gram capacity and active ion diffusion coefficient, so that a secondary battery containing such negative active material has a high energy density and excellent cycling performance, rate performance, and fast charging capacity.

Abstract: An anode material having 0.8?0.06×(Dv50)2?2.5×Dv50+Dv99?12 (1); and 1.2?0.2×Dv50?0.006×(Dv50)2+BET?5 (2), where Dv50 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 50% of the particles, Dv99 represents a value in the volume-based particle size distribution of the anode material that is greater than the particle size of 99% of the particles, and BET is a specific surface area of the anode material, wherein Dv50 and Dv99 are expressed in ?m and BET is expressed in m2/g. The anode material is capable of significantly improving the rate performance of electrochemical devices.

Abstract: An electrochemical apparatus includes an electrolyte and a negative electrode plate. The negative electrode plate 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. The negative electrode active material layer contains a negative electrode active material, and a tortuosity T of the negative electrode active material layer satisfies the following relation: 1 < T ? 2.5, where the tortuosity T is a ratio of a transmission path length Lt of the electrolyte in pores of the negative electrode active material layer to a thickness L0 of the negative electrode active material layer.

Abstract: An anode active material, a secondary battery, and an electrical device. The particles of the anode active material meet the following relationships: 0.1?AR10<0.2, 0.2?AR50<0.4. The width to length ratio of the anode active material is AR10 when a cumulative volume percentage of particles in a volume-based particle size distribution reaches 10%, and the width to length ratio of the anode active material is AR50 when the cumulative volume percentage of particles in a volume-based particle size distribution reaches 50%. The lithium-ion battery containing the anode active material ensures high-energy density (volume, first cycle efficiency, and compacted density) and meets the requirements for the safety, cycle, and cyclic expansion.

Abstract: A negative active material having a surface mean diameter of the negative active material satisfying: lg(SMD?2)+lg(SMD+2)?0.4. SMD is a value of the surface mean diameter of the negative active material measured in ?m, and falls within a range of 10 to 16; and lg is a frequency. The negative active material enables the electrochemical device to achieve a trade-off between a high energy density and a low degree of lithium plating.

Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by means of X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15. The negative active material according to this application can significantly improve an energy density, cycle performance, and rate performance of the electrochemical device.

Abstract: A negative active material includes a carbon material. The carbon material satisfies the following relationship: 6<Gr/K<16, Gr is a graphitization degree of the carbon material, measured by X-ray diffraction; and K is a ratio Id/Ig of a peak intensity Id of the carbon material at a wavenumber of 1250 cm?1 to 1650 cm?1 to a peak intensity Ig of the carbon material at a wavenumber of 1500 cm?1 to 1650 cm?1, and is measured by using Raman spectroscopy, and K is 0.06 to 0.15.

Abstract: A packaging film including a protective layer, a first bonding layer, a metal layer. a second bonding layer and a sealing layer. The protective layer, the first bonding layer, the metal layer. the second bonding layer, and the sealing layer are sequentially stacked. The protective layer includes a polymer resin layer and a carbon material.

Abstract: A composite negative electrode material includes a Si-M-C composite material and graphene on a surface of the Si-M-C composite material, where M includes at least one of boron, nitrogen, or oxygen. Solid state nuclear magnetic resonance testing of the Si-M-C composite material shows that chemical shifts of element silicon include ?5 ppm±5 ppm, ?35 ppm±5 ppm, ?75 ppm±5 ppm, and ?110 ppm±5 ppm, and a peak width at half height at ?5 ppm±5 ppm satisfies 7 ppm<K<28 ppm. The composite negative electrode material and the negative electrode plate and electrochemical apparatus that use the composite negative electrode material have good cycling performance.

Abstract: A negative electrode material, and a negative electrode plate, an electrochemical device, and an electronic device including the same. The negative electrode material includes SiMxCy, where 0.5?x?2, 0.5?y?4, and M includes at least one of boron, nitrogen, oxygen, or aluminum; for SiMxCy, a particle size at a quantity accumulation degree of A % is DNA, a particle size at a volume accumulation degree of B % is DVB, and a half-peak width of a quantity distribution curve is ?DN; and 2 ?m?(DV50?DN50)?6 ?m, and 1?(DN99?DN1)/?DN?1.3. The use of the negative electrode material, and the negative electrode plate, the electrochemical device and the electronic device including the same according to the present application achieve good cycle performance and energy density.

Abstract: A negative electrode active material includes a carbon material, where the carbon material has a specific degree of graphitization and aspect ratio distribution. A degree of graphitization Gr of the carbon material measured by an X-ray diffraction analysis method is 0.82 to 0.92, and based on a total quantity of particles of the carbon material, a proportion of particles with an aspect ratio greater than 3.3 in the carbon material is less than 10%. The negative electrode active material helps to improve cycle performance of the electrochemical apparatus. FIG. 1.

Abstract: A negative electrode active material having a specific aspect ratio and sphericity in a cumulative particle volume distribution. When tested by using a dynamic particle image analyzer, when a cumulative particle volume distribution of the negative electrode active material is 10%, an aspect ratio AR10 of the negative electrode active material satisfies 0.4?AR10?0.55, and a sphericity S10 of the negative electrode active material satisfies 0.48?S10?0.60. The negative electrode active material improves rate performance, dynamics performance, and a deformation problem of the electrochemical apparatus.

Abstract: A negative electrode material includes a silicon-based material, where a particle of the silicon-based material includes at least one recessed portion, and the recessed portion is 50 nm to 20 ?m in width, and 50 nm to 10 ?m in depth. The recessed structure leaves room for the silicon-based material to swell, thereby solving the problem of large volume swelling of the silicon-based material. In addition, when the silicon-based material with the recessed structure is composited with a carbon material, a conductive agent, and the like to form a negative electrode plate, small particles of the carbon material and the conductive agent are embedded into the recessed portion of the silicon-based material, solving the problem of low compacted density of the silicon-based negative electrode material with a recessed structure, and compensating for the low volumetric energy density of the recessed structure.

Abstract: A negative electrode plate includes: a current collector; and a negative electrode framework located on the current collector, where the negative electrode framework includes at least a first negative electrode framework layer and a second negative electrode framework layer, the first negative electrode framework layer is located between the current collector and the second negative electrode framework layer, and a porosity of the first negative electrode framework layer is higher than a porosity of the second negative electrode framework layer. With this design, side reactions between lithium metal and an electrolyte can be reduced, formation of lithium dendrites can be inhibited, and drastic swelling and contraction of the negative electrode plate in volume due to intercalation and deintercalation of lithium ions can be greatly alleviated or even eliminated, thereby improving safety and stability of the electrochemical apparatus.

Abstract: A negative electrode material includes silicon composite particles. The silicon composite particles include amorphous silicon particles and a buffer phase. The amorphous silicon particles are dispersed in the buffer phase. A non-uniformity of the amorphous silicon particles dispersed in the buffer phase is less than or equal to 30%. Also, an electronic device including the negative electrode material.