Production method for non-aqueous electrolyte secondary battery active material providing lithium insertion and solution contact
摘要
說(shuō)明書
Further, a time during which the silicon compound and the solution A, A1, or the silicon compound and A2 are contacted is preferably set to 3 minutes or longer and 100 hours or shorter. When the contact time is not shorter than 3 minutes, a sufficient doping amount of lithium may be obtained. Further, at the time point when the contact time becomes 100 hours, the lithium insertion into the silicon compound reaches a substantial equilibrium state. Further, the reaction temperature is preferably from ?20° to 200° C., and more preferably from 0° C. to 50° C. Among these, the reaction temperature is particularly preferably set to the neighborhood of 20° C. In the temperature range as was described above, since a reaction speed is difficult to decrease, and the lithium compound is difficult to generate precipitates due to a side reaction, a reaction rate of the lithium insertion reaction from the silicon compound is improved.
Subsequently, the silicon compound into which the lithium has been inserted is contacted with the solution B (here, the solution B contains one or more kinds selected from the ether-based solvent, the ketone-based solvent, the ester-based solvent, the alcohol-based solvent, and the amine-based solvent as the solvent) containing the polycyclic aromatic compound or its derivative or both thereof (step 3 of
