3results about How to "Reduce swelling effect" patented technology

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.