Co-doped NFPP Cathode

High-voltage high-rate

Co-doped Na4Fe3(PO4)2P2O7 cathode material achieves excellent high-voltage fast-charging performance by stabilizing the (210) plane and lowering Na+ migration barrier.

Chihao, Yang · Yanzhao, Ren · 79693910 · Luo, Hao · Liu, Wenhong · Yang, Qingchun · Li, Zhiwei · Kong, Xianghua · Yao, Yu · Yu, Yan · Zhang, Dawei

Advanced Energy Materials 2026

Specifications

Capacity

{'zh': '82.3', 'en': '82.3'} mAh g-1

Capacity retention

{'zh': '85.6', 'en': '85.6'} %

Capacity retention

{'zh': '94.1', 'en': '94.1'} %

Na+ migration barrier

{'zh': '0.623', 'en': '0.623'} eV

(210) plane formation energy

{'zh': '0.151', 'en': '0.151'} eV

Full cell capacity

{'zh': '82', 'en': '82'} mAh g-1

Advantages

Ultrahigh rate

Cobalt doping stabilizes the (210) plane and lowers the Na+ migration barrier, enabling 82.3 mAh g-1 at 100C.

Long cycle life

Capacity retention of 85.6% after 5000 cycles at 10C, attributed to stable lattice structure and efficient Na+ diffusion.

Enhanced high-voltage adaptability

Cobalt doping reduces the formation energy of the (210) plane and the Na+ migration barrier, intrinsically improving structural stability under high voltage.

Applications

• High-power sodium-ion batteries：Delivers 82.3 mAh g-1 at 100C for high-power output.
• Sodium battery cathodes：Co-doped NFPP cathode with stable structure under high voltage, replacing existing cathodes.
• Fast-charging energy storage：Lower Na+ migration barrier enables fast charging above 10C.
• Battery pack fast charging：Full cell retains 82 mAh g-1 at 10C and 94.1% after 450 cycles, suitable for fast-charging packs.