| 摘要 |
Disclosed are a sodium salt represented by the average formula (I) below, and a method for producing such a sodium salt. (In the formula, m1, n1, m2 and n2 independently represent 0 or a positive number not more than 2, while satisfying m1 + n1 =2, m2 + n2 =2, 0 < m1 + m2 < 4 and 0 < n1 + n2 < 4.) Also disclosed is a decomposition suppressing method which enables to have a sodium salt represented by the average formula (I) coexistent with a sodium salt represented by the general formula (IV) below. This method enables to improve long-term stability of a sodium salt represented by the general formula (IV).
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