PROCESS FOR PRODUCING LITHIUM-CONTAINING COMPOSITE OXIDE FOR POSITIVE ELECTRODE IN LITHIUM RECHARGEABLE BATTERY

摘要

This invention provides a process for producing a lithium-containing composite oxide that has a large volume capacity density, possesses high safety and discharge/charge cycle durability and is suitable for mass production of a lithium-containing composite oxide having excellent low-temperature properties. The process for producing a lithium-containing composite oxide comprises firing a mixture containing a lithium source, an N element source, an M element source, and optionally a fluorine source under an oxygen-containing atmosphere to produce a lithium-containing composite oxide represented by general formula LipNxMyOzFa wherein N is at least one element selected from the group consisting of Co, Mn and Ni; M represents at least one element selected from the group consisting of transition metal elements other than N, Al and alkaline earth metal elements; and 0.9 ≤ p ≤ 1.2, 0.97 ≤ x ≤ 1.00, 0 y ≤ 0.03, 1.9 ≤ z ≤ 2.2, and x + y = 1 and 0 ≤ a ≤ 0.02, and is characterized in that a material prepared by impregnating an N element source-containing powder with an M element source-containing solution and drying the impregnated product as the N element source and M element source is used and that the firing is carried out in such a manner that first stage firing is carried out at 250 to 700ºC followed by second stage firing of the fired product at 850 to 1100ºC.