Abstract: The present application discloses a negative active material, preparation process thereof and a secondary battery and the related battery module, battery pack and device. The negative active material comprises a core material and a modified polymer coating layer coated on at least a part of the outer surface of the core material, the core material comprises one or more of silicon-based materials and tin based materials, the coating layer comprises carbon element and nitrogen element, wherein the nitrogen element is present in the negative active material in a mass percentage of 0.1%˜0.66%, and the coating layer comprises a —C?N-linkage.

Abstract: A positive electrode active material and a preparation method therefor, a positive electrode plate containing same, a secondary battery, and a power consuming device are provided. The positive electrode active material has a core-shell structure, comprising an inner core and a shell coating the inner core, wherein the inner core comprises Li1+xMn1?yAyP1?zRzO4, and the shell comprises a first coating layer coating the inner core, and a second coating layer coating the first coating layer, and a third coating layer coating the second coating layer. The positive electrode active material of the present application enables the secondary battery to have a higher energy density, and a good rate performance, cycling performance and safety performance.

Abstract: Provided are a negative electrode active material and a preparation method thereof, as well as a secondary battery having the same, and a battery module, a battery pack and an electrical apparatus. The negative electrode active material of the present application comprises: a silicon inner core; a first cladding layer clad on the surface of the silicon inner core, wherein the first cladding layer is a carbon-containing layer; and a second cladding layer clad on the surface of the first cladding layer, wherein the second cladding layer is an elemental sulfur layer. By using the negative electrode active material of the present application, the energy density of the secondary battery can be improved, and the cycle life can be prolonged.

Abstract: The present application provides a negative electrode active material, a process, a battery, a battery module, a battery pack and an apparatus related to the same. The negative electrode active material comprises a core material and a polymer modified coating on at least a part of a surface of core material; wherein the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material; the negative electrode active material has a weight loss rate satisfying 0.2%?weight loss rate?2% in a thermogravimetric analysis test wherein temperature is elevated from 25° C. to 800° C. under a non-oxidizing inert gas atmosphere. The present application can reduce damage to the surface structure of the negative electrode active material, reduce loss of active ions and capacity, meanwhile can well improve coulomb efficiency and cycle performance of the battery.

Abstract: The present application provides a positive electrode active material, a preparation method therefor, a positive electrode plate, a secondary battery and a power consuming device containing same. The positive electrode active material has a core-shell structure, including an inner core and a coating layer coating at least a part of the inner core, wherein the inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer comprising a polymer which comprises one or more of plant polysaccharide, marine polysaccharide and their respective derivatives. The positive electrode active material of the present application enables a secondary battery to have a high energy density as well as significantly improved rate performance, cycling performance and/or high-temperature stability.

Abstract: A positive electrode active material has a core-shell structure, which includes an inner core and a coating layer coating at least part of the inner core. The inner core has a chemical formula of LiaAxMn1-yByP1-zCzO4-nDn, and the coating layer includes a polymer which includes one or more selected from polysiloxanes with linear structure and polysiloxanes with ring structure.

Abstract: A positive electrode active material and a preparation method therefor, a positive electrode plate containing same, a secondary battery, and a power consuming device are provided. The positive electrode active material has a core-shell structure, comprising an inner core and a shell coating the inner core, wherein the inner core comprises Li1+xMn1?yAyP1?zRzO4, and the shell comprises a first coating layer coating the inner core, and a second coating layer coating the first coating layer, and a third coating layer coating the second coating layer. The positive electrode active material of the present application enables the secondary battery to have a higher energy density, and a good rate performance, cycling performance and safety performance.

Abstract: A positive electrode active material has a core-shell structure including an inner core and a shell coating the inner core. The inner core has a chemical formula of Li1+xMn1?yAyP1?zRzO4. The shell includes a first coating layer coating the inner core, a second coating layer coating the first coating layer, a third coating layer coating the second coating layer, and a fourth coating layer coating the third coating layer.

Abstract: The present application discloses a composite graphite material, a secondary battery, an apparatus and a preparation method thereof. The composite graphite material includes a core material and a coating layer coating at least a part of the surface of the core material, the core material including graphite; wherein the absolute value K of zeta potential of the composite graphite material in deionized water with a pH of 7 is at least 20 mV. The use of the composite graphite material provided by the present application can improve the cohesion and bonding force of the negative electrode plate, thereby reducing the cyclic expansion of the secondary battery.

Abstract: The present application provides a negative electrode active material, a process for preparing the same, and a secondary battery, a battery module, a battery pack and an apparatus related the same. The negative electrode active material comprises a core material and a polymer-modified coating layer on at least a part of a surface of the core material, the core material is one or more of a silicon-based negative electrode material and a tin-based negative electrode material, the polymer-modified coating layer comprises sulfur element and carbon element, the sulfur element has a mass percentage of from 0.2% to 4% in the negative electrode active material, the carbon element has a mass percentage of from 0.5% to 4% in the negative electrode active material, and the polymer-modified coating layer comprises a —S—C— bond.

Abstract: The present application provides a silicon carbon negative electrode material, a negative electrode sheet including the same, a secondary battery, a battery module, a battery pack and a power consumption apparatus. A battery composed of a negative electrode prepared by the silicon carbon negative electrode material in the present application as a working electrode, metal lithium as a counter electrode and an electrolyte containing a lithium ion conductive substance may be charged and discharged, and in a case of drawing a relationship graph between a differential value dQ/dV obtained by differentiating a charging and discharging capacity Q by a working electrode potential V and the working electrode potential V, when energizing the negative electrode material in a direction of delithiation, a ratio of a maximum Y of dQ/dV between 400-480 mV to a maximum X of dQ/dV between 200-255 mV may be in a range of 3.5 to 15.

Abstract: A method for recycling a lithium iron phosphate positive plate with low energy consumption and low Al content, including: crushing a lithium iron phosphate positive plate to be recycled into a granular material with a particle size of 1-15 mm by using a crusher; heating the granular material obtained in step (1) to 350-500° C. in an atmosphere furnace in an inert atmosphere; and keeping the granular material at 350-500° C. for 0.5-2 h followed by cooling to a preset temperature to obtain a calcined product; grinding the calcined product obtained in step (2) by using a grinder to obtain a ground product with D50 larger than or equal to 50 ?m; and classifying the ground product obtained in step (3) by using an air classifier to remove Al simple substance to obtain a recovered positive material with an Al content below 200 ppm.

Abstract: The present application provide a silicon-oxygen compound, a secondary battery using it, and related battery modules, battery packs, and devices. The silicon-oxygen compound provided by the present application has a formula of SiOx, in which x satisfies 0<x<2. The silicon-oxygen compound contains both sulfur and aluminum element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to aluminum element is from 1.5 to 13.0. A secondary battery uses the silicon-oxygen compound provided in the present application, so that the secondary battery can have both long-cycle performance and high initial coulombic efficiency.

Abstract: The present application provide a silicon-oxygen compound, a secondary battery using it, and related battery modules, battery packs, and devices. The silicon-oxygen compound provided by the present application has a formula of SiOx, in which x satisfies 0<x<2. The silicon-oxygen compound contains both sulfur and aluminum element, and the sulfur element is present in an amount of 20 ppm˜300 ppm. The mass ratio of sulfur element to aluminum element is from 1.5 to 13.0. A secondary battery uses the silicon-oxygen compound provided in the present application, so that the secondary battery can have both long-cycle performance and high initial coulombic efficiency.

Abstract: The present application discloses a negative active material, a method for preparing the same, and related secondary batteries, battery modules, battery packs and apparatus. The negative active material includes a core material and a polymer-modified coating layer on at least a part of its surface; the core material includes one or more of silicon-based materials and tin-based materials; the coating layer includes sulfur element and carbon element; in the Raman spectrum of the negative active material, the negative active material has scattering peaks at the Raman shifts of 900 cm?1˜960 cm?1, 1300 cm?1˜1380 cm?1 and 1520 cm?1˜1590 cm?1, respectively, in which the scattering peak at the Raman shift of 900 cm?1˜960 cm?1 has a peak intensity recorded as Il, the scattering peak at the Raman shift of 1520 cm?1˜1590 cm?1 has a peak intensity recorded as IG, and Il and IG satisfy 0.2?Il/IG?0.8.

Abstract: This application belongs to the field of energy storage technology, and specifically discloses a negative active material including SiOx particles and a modified polymer coating layer covering the SiOx particles, in which 0<x<2; wherein the negative active material has a peak intensity I1 at the Raman shift ranging from 280 cm?1 to 345 cm?1, a peak intensity 12 at the Raman shift ranging from 450 cm?1 to 530 cm?1, and a peak intensity 13 at the Raman shift ranging from 900 cm?1 to 960 cm?1, and I1, I2 and I3 satisfy 0.1?I1/I2?0.6, and 0.2?I3/I2?1.0. This application also discloses a method for preparing a negative active material and related secondary batteries, battery modules, battery packs and apparatus.

Abstract: The present application discloses a negative active material, a method for preparing the same, and related secondary batteries, battery modules, battery packs and apparatus. The negative active material includes a core material and a polymer-modified coating layer on at least a part of its surface; the core material includes one or more of silicon-based materials and tin-based materials; the coating layer includes sulfur element and carbon element; in the Raman spectrum of the negative active material, the negative active material has scattering peaks at the Raman shifts of 900 cm?1˜960 cm?1, 1300 cm?1˜1380 cm?1 and 1520 cm?1˜1590 cm?1, respectively, in which the scattering peak at the Raman shift of 900 cm?1˜960 cm?1 has a peak intensity recorded as Il, the scattering peak at the Raman shift of 1520 cm?1˜1590 cm?1 has a peak intensity recorded as IG, and Il and IG satisfy 0.2?Il/IG?0.8.

Abstract: This application belongs to the field of energy storage technology, and specifically discloses a negative active material including SiOx particles and a modified polymer coating layer covering the SiOx particles, in which 0<x<2; wherein the negative active material has a peak intensity I1 at the Raman shift ranging from 280 cm?1 to 345 cm?1, a peak intensity 12 at the Raman shift ranging from 450 cm?1 to 530 cm?1, and a peak intensity 13 at the Raman shift ranging from 900 cm?1 to 960 cm?1, and I1, I2 and I3 satisfy 0.1?I1/I2?0.6, and 0.2?I3/I2?1.0. This application also discloses a method for preparing a negative active material and related secondary batteries, battery modules, battery packs and apparatus.

Abstract: The present application discloses a silicon-oxygen compound, a method for preparation thereof, and a secondary battery, a battery module, a battery pack and an apparatus related thereto. The silicon-oxygen compound includes both manganese element and a copper element, a content of the manganese element is from 20 ppm to 500 ppm, and a mass ratio of the manganese element to the copper element is from 1 to 18.

Abstract: The present application discloses a negative active material, preparation process thereof and a secondary battery and the related battery module, battery pack and device. The negative active material comprises a core material and a modified polymer coating layer coated on at least a part of the outer surface of the core material, the core material comprises one or more of silicon-based materials and tin based materials, the coating layer comprises carbon element and nitrogen element, wherein the nitrogen element is present in the negative active material in a mass percentage of 0.1%˜0.66%, and the coating layer comprises a —C?N-linkage.