Copper-Doping Layered P2-Type Na<sub>0.67</sub>Ni<sub>0.25</sub>Mn<sub>0.75</sub>O<sub>2</sub> Enable Ultrastable Cathode Material for Sodium Ion Batteries
P2-type transition metal (TM) layered oxides are commonly used as cathodes in sodium ion batteries (SIB), but their stability at high voltage (>4.0 V) remains challenging. Here, Cu-doped Na0.67[Ni0.25Mn0.75]1–xCuxO2 cathodes were investigated for their potential application in SIBs. Ex situ X-ray diffraction measurements demonstrate that Na0.67[Ni0.25Mn0.75]0.94Cu0.06O2 (NNMC6) maintains a stable P2 phase during the Na+ de/intercalation process. In particular, the NNMC6 cathode exhibits remarkable cycling performance with an 87.4% high-capacity retention at 1 C after 200 cycles. Furthermore, the ability of NNMC6 to deliver a reversible discharge capacity of 89.7 mAh g–1 even at a higher current density of 5 °C is remarkable. These results collectively confirm that Cu doping has a synergistic effect on enhancing the performance of SIBs. This study not only provides an effective and simple method for designing P2-type cathodes with excellent structural stability but also offers valuable guidance for developing SIB cathode materials with ultralow bulk strain.
Authors
- Zhenggang Xiao (ORCID: https://orcid.org/0000-0002-7836-1397)
- Runguo Zheng (ORCID: https://orcid.org/0000-0002-6350-0681)
- Zhishuang Song
- Zhiyuan Wang (ORCID: https://orcid.org/0000-0002-2852-0564)
- Yurong Wu
- Yanguo Liu (ORCID: https://orcid.org/0000-0002-4021-7496)
- Yuan Wan
Institutions
- Universidad del Noreste (MX)
Publication Details
- Journal
- Energy & Fuels
- Published
- 2025-04-16
- DOI
- https://doi.org/10.1021/acs.energyfuels.4c06351
- Citations
- 2
- Primary Topic
- Advancements in Battery Materials
- Type
- article
- Field-Weighted Citation Impact
- 1.46
Funders
- National Natural Science Foundation of China
- Department of Education of Hebei Province
- Fundamental Research Funds for the Central Universities
- Hebei Province Graduate Innovation Funding Project