Single Crystalline Na0.7MnO2 Nanoplates as Cathode Materials for Sodium-Ion Batteries with Enhanced Performance

Single crystalline rhombus‐shaped Na0.7MnO2 nanoplates have been synthesized by a hydrothermal method. TEM and HRTEM analyses revealed that the Na0.7MnO2 single crystals predominantly exposed their (100) crystal plane, which is active for Na+‐ion insertion and extraction. When applied as cathode materials for sodium‐ion batteries, Na0.7MnO2 nanoplates exhibited a high reversible capacity of 163 mA h g−1, a satisfactory cyclability, and a high rate performance. The enhanced electrochemical performance could be ascribed to the predominantly exposed active (100) facet, which could facilitate fast Na+‐ion insertion/extraction during the discharge and charge process. Show your best face: Single crystalline rhombus‐shaped Na0.7MnO2 nanoplates were synthesized by a hydrothermal method (see figure). When used as cathode materials for sodium‐ion batteries, they exhibited a high reversible capacity of 163 mA h g−1, excellent cyclability, and a high‐rate performance. This could be ascribed to the predominantly exposed (100) facet, which could facilitate Na+‐ion insertion/extraction.