Abstract
A lithium-rich layer-structured cathode material (Li1.2Ni0.2Mn0.6O2) is promising for lithium ion batteries due to its high practical capacity; however, it has several issues such as low rate performance, potential shift during cycling, and large irreversible capacity. Previously, our group reported that the change in the metal composition from Li1.2Ni0.2Mn0.6O2 to Li1.16Ni0.37Mn0.47O2 was effective in improving rate performance and suppressing potential shift; however, the large irreversible capacity could not be addressed by the composition change. In this study, Li2O extraction, which occurs during initial charging and causes irreversible capacity, progressed using (NH4)2SO4 before charging to reduce the irreversible capacity for Li1.16Ni0.37Mn0.47O2. The results obtained in the composition, morphology, specific surface area, and crystal structure analyses indicate that the (NH4)2SO4 treatment can extract Li2O from the particle surface without changing the crystal structure. The results obtained in the electrochemical measurements indicate that the irreversible capacity was reduced due to the chemical treatment. Moreover, the high rate and cycling performance for the Li1.16Ni0.37Mn0.47O2 was maintained after the treatment. The treatment with (NH4)2SO4 can reduce the irreversible capacity for Li1.16Ni0.37Mn0.47O2 without harming this material’s advantages such as high rate and cycling performance.
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