| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative electrode for a lithium ion secondary battery having high charge-discharge capacity and excellent cycle characteristics, and to provide a method for manufacturing the battery and a lithium ion secondary battery. <P>SOLUTION: A negative electrode 10 of a lithium ion secondary battery includes a current collector 1 made of a copper foil substrate; a roughening treatment layer 2, having an irregular surface formed on the current collector 1; and a negative active material layer 3 formed on the roughening treatment layer 2, and the negative active material layer 3 has Sn-C 3a which is amorphous carbon containing Sn and a space 3b formed between each Sn-C 3a, and as viewed from the cross section in the thickness direction, porosity which is a ratio of the space 3b inside the negative active material layer 3 is 20% or above. <P>COPYRIGHT: (C)2011,JPO&INPIT |
