A Collaboration of Surface Protection and Bulk Doping for High-performance Li-rich Cathode Materials

摘要

Li-rich layered oxides (LLRO) are promising high energy-density cathode, but always suffer from the oxygen loss in initial activation and gradual structure transformation during cycling, which leads to capacity degradation and potential decay. Here, we employ a simple strategy to achieve the collaboration of surface protection and bulk doping for improving the perform- ance of Li-rich material. Scanning electron microscope and transmission electron microscopy tests demonstrate that a nanoscale protective layer of magnesium pyrophosphate is uniformly coated on the Li-rich material surface.