Mitigating voltage decay of O3‐NaNi1/3Fe1/3Mn1/3O2 layered oxide cathode for sodium‐ion batteries by incorporation of 5d metal tantalum

• DOI: 10.1002/cnl2.136
• Publication Date: 2024-05-28T10:14:16Z
• Authors: Shuai Huang; Yuanyuan Sun; Tao Yuan; Haiying Che; Qinfeng Zheng; Yixiao Zhang; Pengzhi Li; Jian Qiu; Yuepeng Pang; Junhe Yang; Zi‐Feng Ma; Shiyou Zheng
• Keywords: Lattice (music)

Abstract The cycling stability of O3‐type NaNi 1/3 Fe Mn O 2 (NFM) as a commercial cathode material for sodium ion batteries (SIBs) is still challenge. In this study, the Ni/Fe/Mn elements are replaced successfully with tantalum (Ta) in NFM lattice, which generated additional delocalized electrons and enhanced binding ability between transition metal oxygen, resulting suppressed lattice distortion during charging discharging. This caused significant mitigation voltage decay improved cycle within potential range 2.0–4.2 V. optimized Na(Ni ) 0.97 Ta 0.03 sample achieved reversible capacity 162.6 mAh g −1 at current rate 0.1 C 73.2 high 10 C. Additionally, average charge/discharge retention reached 98% after 100 cycles, significantly mitigating decay. work demonstrates contribution towards practical utilization cathodes SIBs energy storage field.