Hollow Na0.62K0.05Mn0.7Ni0.2Co0.1O2 polyhedra with exposed stable {001} facets and K riveting for sodium-ion batteries

Recently, there has been an increased interest in sodium-ion batteries (SIBs), which cathodes that directly determine the performance of play a critical role. Among cathode materials, layered oxide are most fascinating electrode materials for SIBs. However, irreversible phase transition, low capacity, poor air stability, and inferior cycling stability limit application oxides. In this study, hollow P2-Na0.62K0.05Mn0.7Ni0.2Co0.1O2 polyhedra consisting nanosheets with exposed stable {001} facets small amount large-size K+ ions partly replacing Na+ were successfully obtained. By virtue high redox potential Ni2+/4+, it can be stored several days. It also exhibits discharge capacity 115.0 mA h g?1 after 100 cycles at g?1. A preeminent 104.1 achieved even 500 Results showed such performances related to block transition from P2 O2 riveting ions, expands interlayer space (d(O—Na—O)) accelerates transfer sodium. Thus, is one promising