Production method for non-aqueous electrolyte secondary battery active material providing lithium insertion and solution contact
摘要
說明書
When the solution C was not brought into contact with the silicon compound that had been brought into contact with the solution B (Comparative Example 2-1) and when a solvent other than the alcohol-based solvent, the carboxylic acid-based solvent, or water was used as the solvent of the solution C (Comparative Example 2-2), the silicon compound violently reacted during preparation of the negative electrode slurry and could not be formed into the electrode.
On the other hand, in Examples 2-1 to 2-3, the violent reaction did not occur during preparation of the slurry, and the negative electrode active material could be formed into the electrode without any problem. Further, as the solvent of the solution C, the alcohol-based solvent, carboxylic acid-based solvent or water is used, but, an acetone/ethanol mixed solvent or an aqueous solution saturated with lithium carbonate may be particularly preferably used. This is because in the acetone/ethanol mixed solvent, the active Li in the silicon compound is mildly and sufficiently deactivated, and, in the aqueous solution saturated with lithium carbonate, due to a large heat capacity of the solvent, the active Li in the silicon compound is deactivated without accompanying a large temperature increase. As obvious from Table 2, in Example 1-1 and Example 2-3 that used these solvents, the retention rates and initial efficiencies were particularly excellent.
