CATHODE ACTIVE SUBSTANCE POWDER MATERIAL FOR A LITHIUM ION SECONDARY CELL

摘要

Provided is a cathode active substance powder material for lithium ion secondary cells wherein particles (20) which comprise the cathode active substance that constitutes said powder material have the following characteristics: when the amount of compression displacement in the direction of compression of said particles (20) when a load (P) (mN) is applied to said particles (20) to compress them is ?X (µm), the displacement rate X = Pf/?Xf , found from the compression fracture load (Pf) at the point in time at which said particles (20) fracture when a load is applied until said particles (20) fracture, and from the amount of compression displacement ?Xf at the point in time at which said particles (20) fracture, is 3 < X < 12.