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

• Main Authors: TOKORO HISATO, TAKANO SHUICHI, NAKABAYASHI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 11.10.2023
• 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 manufacturing a positive electrode active material for a lithium ion secondary battery, by which the emission of greenhouse gas (GHG) can be held down by avoiding use of a nickel sulphate hexahydrate having a tendency to become larger in its volume to be handled.SOLUTION: A method for manufacturing a positive electrode active material for a lithium ion secondary battery comprises: a mixing step of mixing metal nickel powder, a compound containing lithium, and a compound containing a metal element M other than lithium and nickel into a powder mixture; an oxidizing step of oxidizing metal nickel powder of the powder mixture at 50% or higher in oxidation rate; a pulverization mixing step of pulverizing oxide powder including oxidized metal nickel powder into a pulverized powder mixture; and a sintering step of sintering the pulverized powder mixture to gain a positive electrode active material for a lithium ion secondary battery, which has a layered structure and in which the proportion of Ni to all of metal elements other than Li is 60 atom% or more.SELECTED DRAWING: Figure 4 【課題】取り扱う体積が大きくなってしまう硫酸ニッケル六水和物の使用を回避することで、温室効果ガス（ＧＨＧ）の排出量を抑えたリチウムイオン二次電池用正極活物質の製造方法を提供する。【解決手段】金属ニッケル粉末と、リチウムを含む化合物と、前記リチウム及びニッケル以外の金属元素Ｍを含む化合物と、を混合し混合粉とする混合工程と、前記混合粉の金属ニッケル粉末を酸化率５０％以上に酸化させる酸化工程と、酸化した金属ニッケル粉末を含む酸化粉を粉砕し、粉砕混合粉とする粉砕混合工程と、前記粉砕混合粉を焼成し、Ｌｉ以外の全金属元素当たりにおけるＮｉの割合が６０原子％以上である層状構造のリチウムイオン二次電池用正極活物質を得る焼成工程と、を有するリチウムイオン二次電池用正極活物質の製造方法。【選択図】図４