Honda Motor Co., Ltd.
POSITIVE ELECTRODE FOR LITHIUM ION BATTERY AND LITHIUM ION BATTERY

Abstract:

Provided is a positive electrode for a lithium ion battery that realizes an increase in energy density and is capable of improving durability. A positive electrode for a lithium ion battery (21) has a positive electrode current collector (21A) and a positive electrode mixture layer (21B) formed on the positive electrode current collector (21A). The positive electrode mixture layer (21B) contains a lithium nickel composite oxide and a metallic phosphate that coats the lithium nickel composite oxide. The lithium nickel composite oxide is represented by a chemical formula LiNi.sub.xCo.sub.yM.sub.zO.sub.2 (in the formula, M is one or more elements selected from the group consisting of Mn, Al, Mg and W, x+y+z=1 and 0.6.ltoreq.x<1.0). The metallic phosphate is one or more materials selected from the group consisting of VPO.sub.4, VP.sub.2O.sub.7 and VPO.sub.4F. The mass ratio of the metallic phosphate to the lithium nickel composite oxide is 0.01 mass % or more and 20 mass % or less.