Ternary‐phase layered cathodes toward ultra‐stable and high‐rate sodium ion storage
Wen-Ji Yin, Pei-Dan Su, Qi Lu, Xiaoqiong Li, Ji-Ming Peng, Tengfei Zhou, Gemeng Liang, Yuliang Cao, Hongqiang Wang, Qingyu Li, Sijiang Hu
Abstract
Abstract With the shortage of lithium resources, sodium‐ion batteries (SIBs) are considered one of the most promising candidates for lithium‐ion batteries. P2‐type and O3‐type layered oxides are one of the few cathodes that can access high energy density. However, they usually exhibit structural change, capacity decay, and slow Na ion kinetic. Herein, we present layered ternary‐phase cathodes with P2, P3 and O3 phases by a lattice doping strategy, which is demonstrated by X‐ray diffraction (XRD) refinement. Combining the characteristics of P2, P3 and O3 phases, the layered composites show performance improvement during long‐term battery cycling. In particular, Na 0.7 Li 0.1 Co 0.3 Fe 0.3 Mn 0.3 O 2 (NLCFM) delivers a reversible capacity of 120.1 mAh·g −1 at 0.1C (1.0C = 175 mA·g −1 ) with a superior capacity retention of 72.5% after 1000 cycles at 10.0C. This work offers insights into the development of advanced cathode materials for SIBs.