Process for preparing lithium nickel material and non-aqueous secondary battery having positive electrode prepared from this material

摘要

An active material for the positive electrode of a nonaqueous secondary battery, is prepared by reacting oxalic acid with a water-soluble lithium compound and a water-soluble nickel compound in buffered aqueous solution to yield a co-precipitate of a slightly water-soluble salt of lithium and nickel, and calcining the co-precipitate. The calcination is carried out at a temperature of 650 to 900 DEG C and in air or an atmosphere containing 20% or more by volume of oxygen. The calcinated material obtained has the formula LixNiO2 in which 0.8 ≤ x ≤ 1.2, or LixNi1-yMyO2 in which 0.8 ≤ x ≤ 1.2, 0 < y < 0.5 and M is a transition metal when such a transition metal is added to the buffer.