| 摘要 |
PURPOSE:To obtain a high energy density and to improve the performance, by using a carbon black having a specific particle characteristics as a negative electrode body, and an organic solvent including 20vol.% or more of ethylene carbonate as an electrolyte. CONSTITUTION:A negative electrode body is composed by carrying the lithium to be a negative electrode active substance to a carbon black having the particle characteristics of the DBP oil suction amount 100ml/100g or more, and the arithmetic mean primary particle diameter 40nm or more. And an ethylene carbonate or an organic solvent including 20vol.% or more of ethylene carbonate is made as an electrolyte. Furthermore, the negative electrode is composed in a paper type, including a positive electrode. In this case, the above carbon black has a character suitable to doping and undoping of the lithium, and its extensively developed structural property is favorite to carry the lithium, so as to increase the suction amount. And the ethylene carbonate included in the electrolyte is invaded through clearances of carbon black primary particles, and diffused, so as to make the inserting and removing reaction of the lithium smooth, and a high energy density can be obtained. |
