Abstract: Provided is a positive electrode active material which includes an inner region that is a region from the center of the positive electrode active material particle to R/2, and an outer region that is a region from R/2 to the surface of the positive electrode active material particle, wherein R is a distance from the center of the positive electrode active material particle to the surface thereof. The positive electrode active material further includes 25% to 80% of crystallites C with respect to a total number of crystallites in the outer region. The crystallites C have a high crystallite long-axis orientation degree of 0.5 to 1 and a low crystallite c-axis orientation degree less than 0.5. Thus, the positive electrode active material has high capacity characteristics and a small amount of gas generated.

Abstract: Provided is a positive electrode active material which includes an inner region that is a region from the center of the positive electrode active material particle to R/2; and an outer region that is a region from R/2 to the surface of the positive electrode active material particle, wherein R is a distance from the center of the positive electrode active material particle to the surface thereof. The positive electrode active material further includes 30% to 80% of crystallites A with respect to a total number of crystallites in the outer region of the positive electrode active material, the crystallites A having high crystallite long-axis orientation degree and crystallite c-axis orientation degree. Thus, the positive electrode active material can achieve excellent capacity characteristics and service life characteristics.

Abstract: Provided therein is an apparatus of a volatilizer for phytoncide air, which is a replaceable and exchangeable cartridge type volatilizer, which has an exchange sensor to sense whether or not Hinoki cypress diluted essential oil exists in a reservoir and to let a user know time to replace or exchange the reservoir, and which has slope plates mounted inside the reservoir to make the Hinoki cypress diluted essential oil, which fills the reservoir, go close to and concentrate on an air inlet. The volatilizer for phytoncide air includes: a reservoir having a charging space which is filled with a Hinoki cypress diluted essential oil; slope plates disposed in the charging space of the reservoir; an air inlet and an air outlet respectively formed at an upper portion of the reservoir; and an exchange sensor disposed at a lower portion of the reservoir and connected with a warning light.