POSITIVE ELECTRODE ACTIVE MATERIAL FOR LITHIUM ION SECONDARY BATTERY AND MANUFACTURING METHOD THEREOF

• Main Authors: NIHEI TOMOMICHI, KAMATA YASUTAKA, KAWAKAMI YUJI
• Format: Patent
• Language: English; Japanese
• Published: 20.06.2019
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a method for industrially stably mass-producing a positive electrode active material for a lithium ion secondary battery.SOLUTION: A manufacturing method of a positive electrode active material for a lithium ion secondary battery including at least nickel and lithium includes: a firing step of firing a mixture of a nickel compound powder and a lithium compound powder; and a water washing step of washing a lithium nickel composite oxide powder obtained in the firing step with water, and the firing step is performed under a condition in which a value obtained by dividing the ratio of the amount of lithium to the total amount of transition metals other than lithium in the lithium nickel composite oxide powder after the water washing step by the ratio of the amount of lithium to the total amount of transition metals other than lithium in the lithium nickel composite oxide powder before the water washing step exceeds 0.95.SELECTED DRAWING: None 【課題】 リチウムイオン二次電池用正極活物質を工業的に安定して量産できる製造方法を提供する。【解決手段】 ニッケルとリチウムとを少なくとも含むリチウムイオン二次電池用正極活物質の製造方法であって、ニッケル化合物粉末とリチウム化合物粉末との混合物を焼成処理する焼成工程と、前記焼成工程で得たリチウムニッケル複合酸化物粉末を水洗処理する水洗工程とを有し、前記水洗処理後のリチウムニッケル複合酸化物粉末中のリチウム以外の遷移金属の総物質量に対するリチウムの物質量の比を、前記水洗処理前のリチウムニッケル複合酸化物粉末中のリチウム以外の遷移金属の総物質量に対するリチウムの物質量の比で除した値が０.９５を超える条件で前記焼成工程を行う。【選択図】 なし