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: Disclosed is an exchangeable self-adjusting device for use in a belt, in which a strap is properly extended due to a slight abdominal motion, and a wearer can easily exchange the buckle to follow the fashion. The device includes a cover 10 being movable left and right, a slidable body 20 inserted into a bottom of the cover 10, and a bottom plate 30 hinged to one portion of a bottom of the body 20 by means of a hinge 32. The cover 10 includes a cover hook 12 formed at a front thereof and inserted into a buckle hook 51 provided at a rear of a buckle 50, and a leaf-spring hooking boss 11 with a hooked groove 11a formed at its center. The body 20 includes detachable bosses 21 protruded from both sides thereof, a roller fixing shaft 23 formed at a center of a bottom thereof for rotatably fixing a roller 70, and a hinge protruded from both sides of the rear thereof towards the bottom and having a hinge hole 22.

Abstract: Disclosed is an exchangeable self-adjusting device for use in a belt, in which a strap is properly extended due to a slight abdominal motion, and a wearer can easily exchange the buckle to follow the fashion. The device includes a cover 10 being movable left and right, a slidable body 20 inserted into a bottom of the cover 10, and a bottom plate 30 hinged to one portion of a bottom of the body 20 by means of a hinge 32. The cover 10 includes a cover hook 12 formed at a front thereof and inserted into a buckle hook 51 provided at a rear of a buckle 50, and a leaf-spring hooking boss 11 with a hooked groove 11 a formed at its center. The body 20 includes detachable bosses 21 protruded from both sides thereof, a roller fixing shaft 23 formed at a center of a bottom thereof for rotatably fixing a roller 70, and a hinge protruded from both sides of the rear thereof towards the bottom and having a hinge hole 22.