Titles:
Method for preparing high-strength lithium ion battery silicon alloy composite negative electrode material
一种高强度锂离子电池硅合金复合负极材料的制备方法
Abstracts:
The invention relates to the field of lithium-ion battery materials. Aiming at the problem of low mechanical strength of negative electrode materials, the invention discloses a method for preparing a high-strength lithium-ion battery silicon alloy composite negative electrode material, which is prepared by the following steps: Powder, carbon material, polyacrylonitrile, pullulan gum and/or Glenn gum are mixed to form a mixed slurry; the mixed slurry is crushed; the resulting mixed liquid is ground, and N,N-2 is added during the grinding process Methylformamide; then the slurry obtained by grinding is coated on the copper foil; then the copper foil is dried in a vacuum; then the electrode sheet is thermally decomposed; annealing makes the electrode sheet fall to room temperature. The electrode structure prepared by the invention has higher mechanical strength; it can effectively alleviate the rapid decline in battery performance caused by silicon volume changes; the graphene around the silicon particles has higher mechanical elasticity, which helps to adapt to significant volume changes.
Titles:
Lithium battery silicon carbon negative electrode material and preparation method and application thereof
锂电池硅碳负极材料及其制备方法和应用
Abstracts:
The invention provides a lithium battery silicon carbon negative electrode material and a preparation method and application thereof. The preparation method includes: self-assembly of polyvinylpyrrolidone into hollow microspheres PVP; in-situ growth of silica on the inner surface of the hollow microspheres PVP to obtain hollow microspheres PVP@SiO2 material; sintering the hollow microspheres PVP@SiO2 material , The hollow microsphere C@Si material is obtained; the hollow microsphere C@Si material is coated with lithium titanate to obtain the silicon carbon anode material of the lithium battery. The hollow LTO-C@Si material is obtained by in-situ growth. The hollow structure can effectively alleviate the impact of silicon on the electrode structure due to volume expansion during the cycle, ensuring the continuity of lithium ion transmission and the integrity of the SEI film. The outer layer of lithium titanate provides a rapid transmission channel for lithium ions, which improves the electronic conductivity of the electrode material. The lithium titanate layer can balance the electrode surface potential, so that lithium ions are uniformly deposited to avoid the formation of lithium dendrites.
Titles:
A negative electrode for improving manganese deposition and its lithium ion secondary battery
一种改善锰沉积的负极及其锂离子二次电池
Abstracts:
The invention belongs to the technical field of batteries, and more particularly relates to a negative electrode with improved manganese deposition and a lithium ion secondary battery thereof. The negative electrode includes: a negative electrode current collector; an active material layer provided on the negative electrode current collector; and a functional coating layer provided on the active material layer, the functional coating layer including a binder, inorganic particles and conductive Agent. The functional coating is a porous coating with a certain porosity, which can conduct manganese ions and deposit and store it in the functional coating. Preferably, the porosity of the functional coating is 15%-50 %, preferably 20%-40%, the functional coating is uniform and stable, so that the negative electrode has good industrial production and manufacturing performance, does not fall out of powder, and effectively avoids the phenomenon of manganese deposition. In addition, the lithium ion secondary The battery, battery cycle life and dynamic performance have been improved.
