Precise preparation of layered Na0.5Ni0.25Mn0.75O2 micro-sheets for 3.8 V Na-ion batteries

Novel layered Na0.5Ni0.25Mn0.75O2 micro-sheets were explored as cathode materials for Na-ion batteries for the first time, which can exhibit electrochemical activity operating at an average voltage of 3.8 V (vs. Na+/Na) and deliver a reversible discharge capacity of 121 mA h g−1 at 0.2C rate.