MANUFACTURING METHOD OF LITHIUM ION SECONDARY BATTERY

• Main Authors: HASEGAWA HAJIME, OKADA TAKASHI, TATEISHI MITSURU
• Format: Patent
• Language: English; Japanese
• Published: 07.06.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

To provide a manufacturing method of a lithium ion secondary battery capable of suppressing the prolongation of a manufacture process while suppressing reduction of a battery performance even in a case where an Ni foreign substance is mixed.SOLUTION: A manufacturing method of a lithium ion secondary battery includes: a construction step of constructing an electrode assembly using a cathode, an anode and a nonaqueous electrolyte; a discharge step of discharging the electrode assembly in such a manner that a potential of the cathode ranges from 0 to 0.5 V(vs.Li/Li+) at a temperature equal to or higher than 60°C; and a charge step of charging the electrode assembly, after the discharge step, in such a manner that the potential of the cathode becomes 3.3 V(vs.Li/Li+) or more.SELECTED DRAWING: Figure 1 【課題】Ｎｉ異物が混入された場合であっても、電池性能の低下を抑制しつつ、製造工程の長期化を抑制可能なリチウムイオン二次電池の製造方法を提供する。【解決手段】正極、負極、及び非水電解質を用いて電極組立体を構築する構築工程と、電極組立体を６０℃以上の温度において正極の電位が０～０．５Ｖ（ｖｓ．Ｌｉ／Ｌｉ＋）となるように放電する放電工程と、放電工程後、電極組立体を正極の電位が３．３Ｖ（ｖｓ．Ｌｉ／Ｌｉ＋）以上となるように充電する充電工程と、を備える、リチウムイオン二次電池の製造方法である。【選択図】図１