Positive electrode of a lithium ion cell for use at high load

摘要

Lithium ion cells used in batteries comprise a positive electrode made of 4-8 wt.% conducting carbon black, 0-15 wt.% expanded graphite and 3-10 wt.% polyvinylidenedifluoride-hexafluoropropylene copolymer containing 15-30 mol.% hexafluoropropylene in the copolymer, and a supplement of up to 100% of a lithium-containing metal oxide as active material applied on a metal support. The surface covering is 4-15 mg and the porosity is 40-65 %. An Independent claim is also included for the production of the cell comprising completely dissolving the binder for the positive electrode in a solvent and homogeneously dispersing the active material and the conducting agent in the binder solution. The electrode paste obtained is applied to the electrically conducting support material to form a covering layer of 4-15 mg/cm<2>. The solvent is vaporized and a porosity of 40-65% is obtained.