Further, like in the production method of the negative electrode of the present invention, the negative electrode may be prepared by carrying out inserting lithium, making contact with the solution B, and contacting with the solution C, after the electrode containing the prepared silicon compound is formed (step 5 of FIG. 1) after preparation of the silicon compound. More specifically, first, the electrode is formed, followed by inserting lithium in the silicon compound contained in the electrode. The lithium may be inserted, for example, by making contact the solution A with the electrode to make contact the solution A with the silicon compound in the electrode. Next, the electrode containing the silicon compound into which the lithium has been inserted is contacted with the solution B, thus, the silicon compound in the electrode is contacted with the solution B. Subsequently, by contacting the electrode that has been contacted with the solution B with the solution C, the silicon compound is contacted with the solution C. It is to be noted that, when the silicon compound in the electrode is contacted with the solutions A, B and C, the silicon compound contained in the electrode may be contacted with the solutions A, B and C, for example, by soaking the electrode in the solutions A, B and C, or by spraying the solutions A, B and C on the electrode.
(3. Lithium Ion Secondary Battery)
Next, a lithium ion secondary battery that uses the negative electrode for lithium ion secondary batteries will be described.
(Configuration of Laminate Film Type Secondary Battery)
