A trace lithium occupation strategy enhances the structural stability of a layered NaNi0.4Fe0.2Mn0.4O2 cathode enabling stable cycling†
Abstract
Trace lithium ions are embedded into sodium-ion sites through Li+/Na+ exchange to enhance the structural stability and mitigate interface erosion of layered NaNi0.4Fe0.2Mn0.4O2. The harmful O′3 phase transition in L-NFM was alleviated effectively by Li+ sites during the cycling process.