A novel Na8Fe5(SO4)9@rGO cathode material with high rate capability and ultra-long lifespan for low-cost sodium-ion batteries
Changyu Liu,
Kean Chen,
Huiqian Xiong,
Along Zhao,
Haiyan Zhang,
Qingyu Li,
Xinping Ai,
Hanxi Yang,
Yongjin Fang,
Yuliang Cao
Affiliations
Changyu Liu
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Kean Chen
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Huiqian Xiong
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Along Zhao
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Haiyan Zhang
Guangdong Engineering Laboratory of Energy Storage Materials and Devices, School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China
Qingyu Li
Guangxi Key Laboratory of Low Carbon Energy Materials, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
Xinping Ai
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Hanxi Yang
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
Yongjin Fang
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China; Corresponding authors.
Yuliang Cao
Hubei Key Laboratory of Electrochemical Power Sources, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China; Corresponding authors.
Sodium-ion batteries (SIBs) are regarded as the most promising technology for large-scale energy storage systems. However, the practical application of SIBs is still hindered by the lack of applicable cathode materials. Herein, a novel phase-pure polyanionic Na8Fe5(SO4)9 is designed and employed as a cathode material for SIBs for the first time. The Na8Fe5(SO4)9 has an alluaudite-type sulfate framework and small Na+ ion diffusion barriers. As expected, the as-synthesized Na8Fe5(SO4)9@rGO exhibits a high working potential of 3.8 V (versus Na/Na+), a superior reversible capacity of 100.2 mAh g−1 at 0.2 C, excellent rate performance (∼80 mAh g−1 at 10 C, ∼63 mAh g−1 at 50 C), and an ultra-long cycling life (91.9% capacity retention after 10,000 cycles at 10 C, 81% capacity retention after 20,000 cycles at 50 C). We use various techniques and computational methods to comprehensively investigate the electrochemical reaction mechanisms of Na8Fe5(SO4)9@rGO.
