Abstract: The invention provides a positive electrode active material for a lithium ion battery, comprising a lithium transition metal-based oxide powder, the powder comprising single crystal monolithic particles comprising Ni and Co and having a general formula Li1+a ((Niz (Ni1/2 Mn1/2)y Cox)1?kAk)1-a 02, wherein A is a dopant, ?0.02<a?0.06, 0.10?x?0.35, 0?z?0.90, x+y+z=1 and k?0.01, the particles having a cobalt concentration gradient wherein the particle surface has a higher Co content than the particle center.

Abstract: A ventilation system according to an embodiment of the present disclosure includes: a plurality of dedicated outdoor air systems, each having one or more temperature sensors and configured to cause outdoor air to flow into an indoor space and indoor air to flow outside thereof; and a controller configured to control the plurality of dedicated outdoor air systems based on temperature data sensed by temperature sensors included in the plurality of dedicated outdoor air systems, wherein the controller: in response to temperature uniformity of the indoor space, in which the plurality of dedicated outdoor air systems are installed, satisfying a predetermined temperature uniformity criterion, controls all the dedicated outdoor air systems to operate in a first operation mode in which the dedicated outdoor air systems operate according to a set temperature; and in response to the temperature uniformity not satisfying the predetermined temperature uniformity criterion, controls the dedicated outdoor air systems to op

Abstract: The invention provides a positive electrode active material for a lithium ion battery, comprising a lithium transition metal-based oxide powder, the powder comprising single crystal monolithic particles comprising Ni and Co and having a general formula Li1+a ((Niz (Ni1/2 Mn1/2)y Cox)1-kAk)1-a 02, wherein A is a dopant, ?0.02<a?0.06, 0.10?x?0.35, 0?z?0.90, x+y+z=1 and k?0.01, the particles having a cobalt concentration gradient wherein the particle surface has a higher Co content than the particle center.