Secondary battery electrode, and method for producing same
摘要
說明書
The compression molding may be performed by introducing the mixed raw material to a mold having an internal accommodation space corresponding to the three-dimensional shape and size of the bulk to be desired, and applying a compressive force to the raw material by uniaxial pressing, biaxial pressing, or isotropic pressing. The pressure applied during the molding may be properly adjusted, considering the kind and sintering characteristics of the material included in the raw materal, designed porosity, and the like. As a specific example, the molding may be performed at a pressure of 10 to 120 MPa, but is not limited thereto.
In the active material bulk which is the molded body, the electrode active material may contain a material capable of plastic deformation, as a specific example, a negative electrode active material, as a substantial example, one or more carbon-based negative electrode active material selected from natural graphite and artificial graphite. In this case, since plastic deformation of the electrode active material occurs when press (compression) molding, a three-dimensional body capable of free-standing may be produced using a minimal additive. In addition, independently of this, the electrode active material is plastically deformed by compression, so that the shape thereof is deformed into a pressed shape in the pressure application direction, that is, a pressed particle, and the orientation of the electrode active material may be formed in the active material bulk by the pressed particles (electrode active material particles). The orientation of the electrode active material is advantageous, since it may improve charge and discharge rate characteristics of the electrode. In this respect, when the active material bulk is a molded body, it is preferred that the mixed raw material is introduced to the mold and then the molded body is produced by uniaxial pressing or biaxial pressing.
