| 摘要 |
A negative active material is characterized by being prepared by adding a lignin having a unit structure represented by the formula (I) as the main structure to a lead oxide. Since the lignin of the formula (I) is added, the negative active material can be prevented from shrinkage due to charge/discharge. <CHEM> (wherein R1 is H, OH, COOH, SO3H, SH, C6H5, COO<->, SO3<->, R2C6H4, (R2)2C6H3, or (R2)3C6H2; and R2 is at least one member selected from among OH, COOH, SO3H, and CH2SO3H.) |
