| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium secondary battery with a capacity in which the reduction in battery capacity is small during a large electric current discharge, and the reduction of battery capacity is small even if charging and discharging are repeated. <P>SOLUTION: In a lithium secondary battery in which a sheet-shaped positive electrode 1 in an organic electrolytic solution and a sheet-shaped negative electrode 2 are opposed to each other via a separator 3, the sheet-shaped positive electrode is configured to form a coating film containing positive electrode active substance and a binder and an electron conduction auxiliary agent at least one surface of electron collector assembly used for positive electrode, and the binder of the sheet-shaped positive electrode is configured to include acrylonitrile-butadiene system rubber, and polyvinylidene-fluoride system polymer containing vinylidene-fluoride as a main component monomer. Further, the content in the coating film thereof is not smaller than 0.2 % by mass and not greater than 2 % by mass, and the content in the coating film of electron conduction auxiliary agent for the sheet-shaped positive electrode is made to be 1 to 25 times greater than that of the acrylonitrile-butadiene system rubber of the binder. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
