6results about How to "Reduce swelling effect" patented technology

The invention discloses a nanometer silicon filled microcrystalline graphite negative electrode material and a preparation method and application thereof. The preparation method of the nano-silicon filled microcrystalline graphite negative electrode material comprises the following steps: by taking microcrystalline graphite as a base material, depositing silane between sheet layers of the microcrystalline graphite by adopting a gradient heating method to obtain a nano-silicon filled microcrystalline graphite composite material; and finally, forming the nano-silicon filled microcrystalline graphite negative electrode material with a porous structure on the surface of the nano-silicon filled microcrystalline graphite composite material through carbon source coating carbonization. According to the nano-silicon-filled microcrystalline graphite negative electrode material with the core-shell structure provided by the invention, an inner core is a silicon-graphite composite material formed by nano-silicon-filled microcrystalline graphite, nano-silicon particles are filled in the surfaces and gaps of crystalline grains of the microcrystalline graphite, volume expansion of the nano-silicon in the charging and discharging process is inhibited by a microcrystalline graphite matrix material, and particularly, the volume expansion of the nano-silicon in the charging and discharging process is inhibited by the microcrystalline graphite matrix material. And due to different structural orientations of the microcrystalline graphite, the stress effect can be counteracted, and the volume expansion of the material is further inhibited.

The invention discloses a SiOX / microcrystalline graphite negative electrode material and a preparation method and application thereof. Relates to the technical field of lithium battery cathode materials. The preparation method comprises the following steps: by taking microcrystalline graphite as a base material, growing nano silicon oxide particles in situ on the surface of the microcrystalline graphite and in gaps of sheet layers by adopting a hydrothermal reaction method to form a SiOX / microcrystalline graphite composite material, and coating the surface of the SiOX / microcrystalline graphite composite material with a carbon coating layer with a complete carbon layer structure, and finally, the SiOX / microcrystalline graphite negative electrode material with the core-shell structure is formed. By adopting the technical scheme, the stress effect caused by silicon volume expansion in the charging and discharging process is counteracted and inhibited by utilizing the disordered layer structure characteristic that the structure orientation of fine scales of the microcrystalline graphite is different; meanwhile, the nano SiOX particles are filled in the gaps of the microcrystalline graphite flake layer, and the fine flake graphite constructs a three-dimensional conductive network structure, so that the problem of poor conductivity of the SiOX particles is solved.

The invention discloses a SiO X / Microcrystalline graphite negative electrode material and its preparation method and application; relates to the technical field of lithium battery negative electrode materials. The preparation method comprises using microcrystalline graphite as a matrix material, using a hydrothermal reaction method to in-situ grow nano silicon oxide particles on the surface of microcrystalline graphite and in the gaps between the sheets to form SiO X / microcrystalline graphite composites, and in the SiO X The surface of the microcrystalline graphite composite material is coated with a carbon coating layer with a complete carbon layer structure, and finally a SiO X / Microcrystalline graphite negative electrode material. The technical solution of the present invention uses the structure of microcrystalline graphite flakes with different structural orientations to offset and suppress the stress caused by silicon volume expansion during the charging and discharging process; at the same time, nano-SiO X The particles are filled in the gaps of the microcrystalline graphite flake layers, and the fine flake graphite builds a three-dimensional conductive network structure, improving the SiO X The problem of poor electrical conductivity of particles.

The application provides an anode sheet and a secondary battery using the same, the anode sheet comprising an anode active material layer, the anode active material layer comprising an anode active material and a binder, the anode active material comprising a silicon-based active substance, and the binder comprising polyacrylic acid and its derivatives and polyvinyl alcohol; the anode sheet is laser-perforated; when the mass content of the silicon-based active substance is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the power of the laser perforation; and when the power of the laser perforation is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the mass content of the silicon-based active substance. Compared with the prior art, the anode sheet provided by the application selects anode sheets containing different contents of the binder according to different laser perforation powers or different silicon contents of the silicon anode sheet, thereby avoiding excessive burning of the active substance at the non-perforated part of the silicon anode sheet, and improving the cycle performance and safety performance of the battery in the charging and discharging process.

The invention relates to the technical field of negative electrode materials, in particular to a negative electrode material and a battery, the negative electrode material comprises a base material and a silicon material, at least part of the silicon material is located in the base material, and the silicon material comprises a first phase and a second phase; wherein the negative electrode material is measured by a precession electron diffraction method: based on the region where the silicon material is located, the area proportion of the region where the silicon material of the first phase is located is A which is greater than or equal to 70%, and the area proportion of the region where the silicon material of the second phase is located is B which is greater than 0 and less than or equal to 30%. The negative electrode material provided by the invention has low expansion, high capacity and excellent cycle performance.

This invention relates to the field of battery technology, specifically to a negative electrode sheet, its manufacturing method, and a battery. The negative electrode sheet includes: a negative electrode current collector; and a negative electrode active material layer disposed on at least one side surface of the negative electrode current collector. The active material layer comprises an active material, which includes particulate matter and lamellar matter. The ratio of the long axis to the short axis of the particulate matter ranges from 1.0 to 1.3. The particulate matter includes a core and a coating layer disposed on at least a portion of the surface of the core. The core includes a porous carbon framework and nano-silicon embedded within the porous carbon framework, and the coating layer is a carbon coating layer. Compared with existing technologies, this invention achieves better overall interaction through a multi-scale stress-controlled structure of porous carbon framework / embedded nano-silicon / outer carbon coating, resulting in a negative electrode sheet with higher cycle performance and lower expansion performance, thereby improving battery capacity utilization, cycle stability, and safety performance.