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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Simultaneous MgO coating and Mg doping of NaNi0.5Mn0.5O-2 cathode: facile and customizable approach to high-voltage sodium-ion batteries
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Simultaneous MgO coating and Mg doping of NaNi0.5Mn0.5O-2 cathode: facile and customizable approach to high-voltage sodium-ion batteries

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Herein, we report substantially improved high-voltage stability of NaNi0.5Mn0.5O-2 as a cathode material due to a surface MgO coating and bulk Mg doping for high-voltage sodium-ion batteries, for the first time. The MgO coating layer effectively suppressed the unfavorable side reactions during cycling while the partial Mg doping into the bulk Ni sites improved the structural stability by moderating the extent of the irreversible multiphase transformation. As a result, the combination of a MgO coating with Mg doping provides enhanced electrochemical performance and structural stability of NaNi0.5Mn0.5O-2 within the voltage range of 2.0-4.2 V. The material demonstrated a high specific capacity of 167 mA h g(-1) at a 0.1C and excellent cycling stability and rate capability with 60 capacity retention at 10C (vs. the initial capacity at 0.1C). The practical acceptability of the simultaneous MgO coating and Mg doping of the NaNi0.5Mn0.5O-2 cathode was obviously verified using scaled-up pouch-type full cells with hard carbon anodes.

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