NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, METHOD FOR PRODUCING SAME, AND LITHIUM ION SECONDARY BATTERY USING SAME

摘要

Disclosed is a negative electrode for lithium ion secondary batteries which comprises a collector and an active material layer supported by the collector. The active material layer contains an active material represented by the following general formula: Li_aSiO_x (wherein 0.5 = a - x = 1.1 and 0.2 = x =1.2), and the active material is obtained by vapor depositing lithium on a layer containing an active material precursor which contains silicon and oxygen, thereby reacting the active material precursor with lithium.