Access to high-performance Li-rich layered oxide cathodes via ammonium phosphate surface treatment. Issue 36 (14th April 2023) - Huang, Xiaobao
Abstract : Constructing a multi-component surface integrated structure of a Li-rich oxide cathode material by ammonium phosphate surface treatment to enhance its electrochemical performance. Abstract : Ammonium phosphate ((NH4 )3 PO4 ) has been first used as a surface treatment reagent for Li-rich cathode materials. Compared to the conventional surface treatment, the samples treated with (NH4 )3 PO4 exhibit an ultra-high initial Coulomb efficiency of 98.0% and excellent cycling stability. This is mainly attributed to the simultaneous construction of surface integrated structures, including oxygen vacancies, spinel phases, and Li3 PO4 coating. This study demonstrates the effectiveness of ammonium phosphate surface treatment and provides a new idea for designing other cathode materials.