LITHIUM SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium secondary battery of a high capacity and a long service life. SOLUTION: A positive electrode plate was obtained using a lithium manganate powder wherein lithium manganate of a layer structure and lithium manganate of a spinel structure are compounded to a positive electrode active material at a weight ratio of 55:45. A negative electrode plate was obtained by using amorphous carbon or a graphite powder as a negative electrode active material. The positive electrode plate and the negative electrode plate were combined so that a reversible capacity of the positive electrode plate may equal to a reversible capacity of the negative electrode plate or less to fabricate a cylindrical lithium ion battery. A lithium ion of the same quantity as a lithium ion moved to the negative electrode from the positive electrode when charging is returned to the positive electrode when discharging, and deterioration of the negative electrode can be restrained by reducing a burden of the negative electrode caused when charging.