Positive electrode active material, method for manufacturing positive electrode active material and nonaqueous electrolyte battery

A nonaqueous electrolyte battery comprising:

• a positive electrode;
• a negative electrode;
• and
• an electrolyte, wherein
• the positive electrode includes a positive electrode active material,
• the positive electrode active material includes a lithium complex oxide particle and a coating layer formed on at least a part of a surface of the lithium complex oxide particle,
• the lithium complex oxide particle is a lithium complex oxide particle composed mainly of nickel,
• the coating layer contains an oxo acid and/or an oxo acid compound,
• an acidity of the surface of the lithium complex oxide particle is increased by the coating layer,
• the acidity is determined based on a pH of a supernatant of water in a state where after 1.0 part by weight of the lithium complex oxide particle and having a coating layer formed thereon is dispersed in 50 parts by weight of water, the lithium complex oxide particle sediments, and
• the pH is less than 8.0.