METHOD OF MANUFACTURING NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

• Main Authors: NAKAMURA HIROSHI, MAEKAWA MASANORI, SHIGEMATSU FUMIKO, TODE SHINGO
• Format: Patent
• Language: English
• Published: 16.10.2008
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

PROBLEM TO BE SOLVED: To suppress bulging of a battery and increase in internal resistance of a battery during high temperature storage and obtain excellent charged storage characteristics in the nonaqueous electrolyte secondary battery using a lithium transition metal composite oxide mainly containing Ni as the transition metal and having layer structure as a positive active material. SOLUTION: The method of manufacturing the nonaqueous electrolyte secondary battery containing a positive electrode including a lithium transition metal composite oxide mainly containing Ni as the transition metal and having layer structure as the positive active material, a negative electrode including a material absorbing releasing lithium as a negative active material, and a nonaqueous electrolyte is provided with a process assembling the battery with the positive electrode, the negative electrode, and the nonaqueous electrolyte; a process charging the battery until the potential of the positive electrode reaches 4.0 V (vs. Li/Li+) or higher; a process storing the battery after charging at 85-120°C and generating gas; and a process removing generated gas. COPYRIGHT: (C)2009,JPO&INPIT