Production method for non-aqueous electrolyte secondary battery active material providing lithium insertion and solution contact
摘要
說明書
Further, the temperature of the solution A is preferably near to 20° C. This is because when the temperature of the solution A is in the neighborhood of 20° C., the reaction speed is difficult to decrease, and, the lithium compound is difficult to generate precipitate due to the side reaction, a reaction rate of an insertion reaction of the lithium from the silicon compound is improved. Therefore, compared with the case where the temperature of the solution B is higher or lower than 20° C. like in Examples 3-9 and 3-10, examples where the temperature of the solution is 20° C. (for example, Example 1-1) had more excellent battery characteristics.
Further, the contact time of the powder of silicon compound and the solution A is desirable 3 minutes or longer and 100 hours or shorter. When the contact time is not shorter than 3 minutes (for example, Example 3-18), compared with the case of shorter than 3 minutes (Example 3-17), the lithium may be sufficiently inserted into the silicon compound. Still further, around the time when the contact time reaches 100 hours, the lithium insertion into the silicon compound reaches a substantial equilibrium.
In Comparative Example 3-1, since the lithium is not inserted into the silicon compound, the electrode could be formed without problem, but the battery characteristics were deteriorated.
It is to be noted that the present invention is not limited to the above examples. The above examples are merely exemplary, and, all of what has the substantially same configuration as technical idea described in claims of the present invention and has the similar effects are included in the technical range of the present invention.
