Carbon-coated Na3.32Fe2.34(P2O7)2 cathode material for high-rate and long-life sodium-ion batteries

Chen, Mingzhe, Chen, Lingna, Hu, Zhe, Liu, Qiannan, Zhang, Binwei, Hu, Yuxiang, Gu, Qinfen, Wang, Jian-Li, Wang, Lian-Zhou, Guo, Xiaodong, Chou, Shu-Lei and Dou, Shi-Xue (2017) Carbon-coated Na3.32Fe2.34(P2O7)2 cathode material for high-rate and long-life sodium-ion batteries. Advanced Materials, . doi:10.1002/adma.201605535


Author Chen, Mingzhe
Chen, Lingna
Hu, Zhe
Liu, Qiannan
Zhang, Binwei
Hu, Yuxiang
Gu, Qinfen
Wang, Jian-Li
Wang, Lian-Zhou
Guo, Xiaodong
Chou, Shu-Lei
Dou, Shi-Xue
Title Carbon-coated Na3.32Fe2.34(P2O7)2 cathode material for high-rate and long-life sodium-ion batteries
Formatted title
Carbon-coated Na3.32Fe2.34(P2O7)2 cathode material for high-rate and long-life sodium-ion batteries
Journal name Advanced Materials   Check publisher's open access policy
ISSN 1521-4095
0935-9648
Publication date 2017-03-29
Sub-type Article (original research)
DOI 10.1002/adma.201605535
Open Access Status Not yet assessed
Total pages 8
Place of publication Weinheim, Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Collection year 2018
Language eng
Formatted abstract
Rechargeable sodium-ion batteries are proposed as the most appropriate alternative to lithium batteries due to the fast consumption of the limited lithium resources. Due to their improved safety, polyanion framework compounds have recently gained attention as potential candidates. With the earth-abundant element Fe being the redox center, the uniform carbon-coated Na3.32Fe2.34(P2O7)2/C composite represents a promising alternative for sodium-ion batteries. The electrochemical results show that the as-prepared Na3.32Fe2.34(P2O7)2/C composite can deliver capacity of ≈100 mA h g-1 at 0.1 C (1 C = 120 mA g-1), with capacity retention of 92.3% at 0.5 C after 300 cycles. After adding fluoroethylene carbonate additive to the electrolyte, 89.6% of the initial capacity is maintained, even after 1100 cycles at 5 C. The electrochemical mechanism is systematically investigated via both in situ synchrotron X-ray diffraction and density functional theory calculations. The results show that the sodiation and desodiation are single-phase-transition processes with two 1D sodium paths, which facilitates fast ionic diffusion. A small volume change, nearly 100% first-cycle Coulombic efficiency, and a pseudocapacitance contribution are also demonstrated. This research indicates that this new compound could be a potential competitor for other iron-based cathode electrodes for application in large-scale Na rechargeable batteries.
Keyword Carbon coatings
Cathode materials
Cycling stability
Polyanion frameworks
Sodium-ion batteries
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Australian Institute for Bioengineering and Nanotechnology Publications
 
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