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A lithium‐rich cathode material Li1.14Mn0.54Ni0.14Co0.14O2 (LNMCO) is prepared by a co‐precipitation method. The issue of voltage decay in long‐term cycling is largely eliminated by control of the charge–discharge voltage range. The LNMCO material exhibits 9.8 % decay in discharge voltage over 200 cycles between 2.0–4.6 V, during which the working voltage decays significantly, from 3.57 V to 3.22...
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