Cobalt-free Li-rich layered oxide cathode materials were synthesized via coprecipitation of a carbonate precursor,and the effects of composition adjustment on the cation arrangement and electrochemical performance were studied.Morphological and structural characterizations,along with electrochemical tests,revealed that reducing the molar fraction of Li reduces the primary particle size and decreases the size of Li2MnO3-like domains without affecting the overall molar fraction of the Li-rich phase.This reduction in domain size enhances the oxidation activity of lattice oxygen,thereby increasing charge capacity.Additionally,the increase the degree of Li+/Ni2+mixing improves the reduction activity of lattice oxygen,leading to higher discharge capacity and reduced voltage decay during cycling.
Li-ion batteriesLi-rich layer oxidescobalt-freeLi2MnO3 like domain
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