To provide a long life lithium secondary battery in which deterioration of the maintenance rate of capacity and output accompanied with charge and discharge cycles is suppressed.
As for this cylindrical lithium ion battery, both the positive electrode fabricated by using lithium manganate powder as the positive electrode active material and the negative electrode fabricated by using bulk phase graphite as the negative electrode active material are used. As the binder of the negative electrode, a mixture in which a thermosetting plasticized polyvinyl alcohol series resin composition fabricated by using thermosetting plasticized polyvinyl alcohol series resin and acrylic resin series plasticizer, and polyvinylidene fluoride are mixed at the volume ratio of 60:40, is used . By this, peeling-off and falling off of the negative electrode mixture accompanied with the charge and discharge of the cylindrical lithium ion battery are suppressed.
COPYRIGHT: (C)2004,JPO
Koji Higashimoto
Kensuke Hironaka
Kenji Nakai
Kenji Hara
Toshikazu Maejima
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