Citation: Zheng Li, Fangkun Li, Xijun Xu, Jun Zeng, Hangyu Zhang, Lei Xi, Yiwen Wu, Linwei Zhao, Jiahe Chen, Jun Liu, Yanping Huo, Shaomin Ji. A scalable approach to Na₄Fe₃(PO₄)₂P₂O₇@carbon/expanded graphite as cathode for ultralong-lifespan and low-temperature sodium-ion batteries[J]. Chinese Chemical Letters, ;2025, 36(10): 110390. doi: 10.1016/j.cclet.2024.110390 shu

A scalable approach to Na₄Fe₃(PO₄)₂P₂O₇@carbon/expanded graphite as cathode for ultralong-lifespan and low-temperature sodium-ion batteries

Zheng Li ^{a, 1} ,
Fangkun Li ^{b, 1} ,
Xijun Xu ^{a, c, *,} ,
Jun Zeng ^b ,
Hangyu Zhang ^a ,
Lei Xi ^b ,
Yiwen Wu ^b ,
Linwei Zhao ^b ,
Jiahe Chen ^b ,
Jun Liu ^{b, *,} ,
Yanping Huo ^{a, c, d} ,
Shaomin Ji ^{a, c, *,}

a.
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
b.
Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
c.
Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center, Jieyang 515200, China
d.
Analysis and Test Center, Guangdong University of Technology, Guangzhou 510006, China

xuxijun2022@gdut.edu.cn

msjliu@scut.edu.cn

smji@gdut.edu.cn

Received Date: 19 July 2024
Revised Date: 14 August 2024
Accepted Date: 29 August 2024
Available Online: 30 August 2024

Figures(5)

Mixed polyanion phosphate Na₄Fe₃(PO₄)₂P₂O₇ (NFPP) is regarded as the most promising cathode material for sodium-ion batteries (SIBs), due to its high structural stability and low-cost environmental friendliness. However, its intrinsic low conductivity and sluggish Na⁺ diffusion restricted the fast-charge and low-temperature sodium storage. Herein, an NFPP composite encapsulated by in-situ pyrolytic carbon and coupled with expanded graphite (NFPP@C/EG) was constructed via a sol-gel method followed by a ball-mill procedure. Due to the dual-carbon modified strategy, this NFPP@C/EG only enhanced the electronic conductivity, but also endowed more channels for Na⁺ diffusion. As cathode for SIBs, the optimized NFPP (M-NFPP@C/EG) delivers excellent rate capability (capacity of ~80.5 mAh/g at 50 C) and outstanding cycling stability (11000 cycles at 50 C with capacity retention of 89.85%). Additionally, cyclic voltammetry (CV) confirmed that its sodium storage behavior is pseudocapacitance-controlled, with in-situ electrochemical impedance spectroscopy (EIS) further elucidating improvements in electrode reaction kinetics. At lower temperatures (0 ℃), M-NFPP@C/EG demonstrated exceptional cycling performance (8800 cycles at 10 C with capacity retention of 95.81%). Moreover, pouch cells also exhibited excellent stability. This research demonstrates the feasibility of a dual carbon modification strategy in enhancing NFPP and proposes a low-cost, high-rate, and ultra-stable cathode material for SIBs.
- Na₄Fe₃(PO₄)₂P₂O₇,
- Expanded graphite,
- Dual-carbon modified,
- Polyanionic compounds cathode,
- Sodium-ion batteries
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通讯作者: 陈斌, bchen63@163.com

A scalable approach to Na₄Fe₃(PO₄)₂P₂O₇@carbon/expanded graphite as cathode for ultralong-lifespan and low-temperature sodium-ion batteries