The present disclosure relates to an electrochemically active lithium-rich layered oxide having the general formula Li[(1.33-0.67x-y)Mn(0.67-0.5z-0.33x)Ni(x-0.5z+2y)M(z-y)O2, wherein M is cobalt (Co), chromium (Cr), or any combinations thereof, wherein, with respect to the amount of Li, 1 (1.33-0.67x-y) 1.2, wherein, with respect to the amount of Mn, 0.5 (0.67-0.5z-0.33x) 0.6, wherein, with respect to the amount of Ni, 0.2 (x-0.5z+2y) 0.5, and wherein, with respect to the amount of M, 0 (z-y) 0.13. The present disclosure further relates to cathodes and rechargeable batteries containing such a lithium-rich layered oxide.
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