| 摘要 |
PURPOSE:To improve wettability for an electrolyte, and provide excellent battery characteristics by using carbon powder as a main material having a surface roughened through the adsorption of an interfacial active agent, or plasma treatment. CONSTITUTION:For the adsorption of an interfacial active agent, each interfacial active agent of an anionic system such as higher fatty acid alkali salt, a cation system such as higher amine halogen acid salt, and a nonionic system such as polyethylene glycol alcohol alkylether, is dispersed or dissolved in water, alcohol or the like. Carbon powder is immersed in the liquid so prepared and, then, the solvent is transpired. An adsorption amount is preferably 10 pts.wt. or less for 100 pts.wt. of the carbon powder. An ion milling plasma etching method using inert gas such as argon gas, is applied for plasma treatment. Also, a positive electrode mainly composed of LiCoO2, and a negative electrode 2 mainly composed of the carbon powder are spirally housed in a negative electrode can 7 via a separator 3 filled with a nonaqueous electrolyte, thereby forming a battery BA1. |
