Four-In-One Strategy to Boost the Performance of Na_xNi,MnO_2

摘要

High-performance layered oxide cathode materials are vital to theindustrialization of Na-ion batteries (NIBs) due to their high theoreticalcapacity and facile production. These materials, however, suffer fromcomplicated phase transitions and poor capacity retention cycling. Themodifying impacts of classic strategies, such as doping and coating, aregenerally restricted. Herein, a rational four-in-one strategy to boost the overallperformance of Na_xNi,MnO_2 materials by innovative composition designand elegant synthesis management is provided. After modification, thehalf-cell capacity retention rate increases from 45 to 77 after 250 cycles at1 C rate. The capacity of the full cells is maintained at 83 after 300 cycles at0.5 C rate. This four-in-one strategy, which encompasses optimization of theenergy band structure, ion diffusion, crystal structure, and particlemorphology, sheds new insight into the overall optimization of cathodematerials for NIBs.