| 摘要 |
<p>Abstract: Disclosed are a sodium salt represented by the average formula (I) below, and a method for producing such a sodium salt. (In the formula, m 1 , n 1 m 2 and n 2 independently represent 0 or a positive number not greater than 2, while satisfying m 1 + n 1 = 2, m 2 + n 2 = 2, 0 < m 1 + m 2 < 4 and 0 < n 1 + n 2 < 4) Also disclosed is a decomposition suppression method which makes a sodium salt represented by average formula (I) coexist with a sodium salt represented by the general formula (IV) below. This method enables improvement of long-term stability of a sodium salt represented by general formula (IV).</p> |
