POSITIVE ELECTRODE FOR LITHIUM ION BATTERY, METHOD FOR PRODUCING SAME, AND LITHIUM ION BATTERY USING THE POSITIVE ELECTRODE

摘要

Disclosed are: a positive electrode which contains lithium-containing nickel oxide as a positive electrode active material and has excellent input/output characteristics, excellent durability and excellent reliability; and a lithium ion battery which uses the positive electrode. The positive electrode comprises a positive electrode collector and a positive electrode active material layer that is formed on the surface of the positive electrode collector. The positive electrode active material layer contains a lithium-containing nickel oxide represented by general formula (1): LixNi1-(p+q+r)CopAlqMrO2+y (wherein M represents a transition element (excluding Ni and Co) or the like; and 0.8 = x = 1.4 and 0 < (p + q + r) = 0.7) and lithium carbonate, and has a high lithium carbonate concentration region and a low lithium carbonate concentration region. The high concentration region occupies 2-80% of the total thickness of the positive electrode active material layer from the surface thereof, while the low concentration region occupies the rest on the positive electrode collector side.