TY  - JOUR
AU  - Mo, Zexin
AU  - Xie, Xiaoyan
AU  - Hua, Zhiyuan
AU  - Lin, Zhan
AU  - Liu, Chenyu
AU  - Cui, Jiaxiang
PY  - 2026
TI  - Reconstruction of magnetic exchange networks for high-performance Co-free Ni-rich cathodes
JO  - Energy Materials and Devices
SN  - 3005-3315
SP  - 9370094
VL  - 4
IS  - 2
AB  - Co-free Ni-rich layered oxide LiNi0.8Mn0.2O2 has garnered considerable attention due to its high energy density and low cost. However, under high-voltage operation, its practical application suffers from severe lattice oxygen release and irreversible H2 → H3 transition, resulting in structural degradation and rapid capacity fading. To address this inconvenience, this study proposes a Fe/Zr codoping strategy: the incorporated Fe modulates the local transition metal–oxygen electronic environment and stabilizes the local oxygen coordination environment via Fe–O interactions, while Zr4+ exerts a lattice-anchoring effect through strong Zr–O bonding, thereby suppressing oxygen loss and detrimental phase transitions upon deep delithiation. The codoped cathode material retains a well-defined layered structure and exhibits superior electrochemical performance; it delivers a high reversible capacity of 207.06 mAh g−1 at 0.1 C, achieves capacity retention of 81.55% after 200 cycles at 1 C, and maintains a high rate capability of 141.76 mAh g−1 at 5 C. This study provides an effective doping strategy for stabilizing lattice oxygen and modulating charge compensation in Co-free Ni-rich cathode materials.
UR  - https://doi.org/10.26599/EMD.2026.9370094
DO  - 10.26599/EMD.2026.9370094