Patent ID: 6071489
Filing Date: 2000-06-06
Classification: B82Y,C01G,C01P

Abstract:
A method of preparing Li.sub.x Mn.sub.2 O.sub.4 (x=1.about.1.1) powder for a cathode active material of a lithium secondary battery, which comprises:mixing a solution of Li-salt and Mn-Salt as metal precursors and a solution of polyvinylbutyral (PVB) as a chelating agent, wherein the molar ratio of Li to Mn is in the range of 1.about.1.1:2 and wherein the molar ratio of the two metals to the PVB in the range of 0.1.about.5.0;heating said mixed solution in the temperature range of 70.degree. C. to 90.degree. C. in the range of pH 1.about.11 to provide a PVB/metal sol;further heating said PVB/metal sol in the temperature range of 70.degree. C. to 90.degree. C. to provide a PVB/metal gel; andcalcining said PVB/metal gel in the temperature range of 200.degree. C. to 900.degree. C. for 5 to 30 hours under an inert gas or air.