Sodium iron sulfate cathodes with ultra-long cycle-life and high safety for sodium-ion batteries

IF 16.8 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Zhilin Zheng , Yong Wang , Yunlong Zhang , Xiaoqiao Li , Yixiao Zhang , Yu-Shi He , Haiying Che , Linsen Li , Zi-Feng Ma
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Abstract

The development of low-cost and high-safety cathode materials is critically important to sodium-ion battery (Na-ion) research. Here we report a carbon nanotube (CNT)-percolating Na2Fe(SO4)2 cathode (NFS-CNT) prepared via a rationally designed mechano-chemical method. The material synthesis mechanism is elucidated for the first time by in situ X-ray diffraction and thermogravimetric analysis. It is discovered that Na2Fe(SO4)·4H2O is formed as an intermediate phase during the mechano-chemical process, which is dehydrated to produce the Na2Fe(SO4)2 cathode material upon a mild thermal treatment. The NFS-CNT composite cathode achieves an ultra-long cycle-life of over 13,000 cycles at 10 C at room temperature and over 6000 cycles at 55 °C, demonstrating its exceptional durability. The superior cycling performance is attributed to the small lattice change during Na-ion extraction/insertion and the percolating CNT network. Furthermore, the NFS/CNT cathode exhibits stable cycle performance in Na-ion full cells (93.4 % retention after 700 cycles) and a significantly lower heat release (∼ 229.2 J g−1) at the fully charged state compared to a wide range of Na-ion and Li-ion cathodes. materials. demonstrating its high thermal stability and safety. This work provides a promising path towards developing low-cost, high-performance Na-ion batteries.

Abstract Image

用于钠离子电池的具有超长循环寿命和高安全性的硫酸铁钠阴极
开发低成本、高安全性的阴极材料对钠离子电池(Na-ion)研究至关重要。在此,我们报告了一种通过合理设计的机械化学方法制备的碳纳米管(CNT)-过孔 Na2Fe(SO4)2 阴极(NFS-CNT)。通过原位 X 射线衍射和热重分析,首次阐明了材料的合成机理。研究发现,Na2Fe(SO4)-4H2O 是机械化学过程中形成的中间相,经温和热处理后脱水生成 Na2Fe(SO4)2 阴极材料。NFS-CNT 复合阴极实现了超长的循环寿命,在室温 10 摄氏度下可循环 13,000 次以上,在 55 摄氏度下可循环 6,000 次以上,显示了其卓越的耐用性。优异的循环性能归功于纳离子萃取/插入过程中的微小晶格变化和渗透型 CNT 网络。此外,与各种钠离子和锂离子阴极材料相比,NFS/CNT 阴极在钠离子全电池中表现出稳定的循环性能(700 次循环后保持率为 93.4%),并且在完全充电状态下的热释放量(∼ 229.2 J g-1)显著较低。这项工作为开发低成本、高性能的钠离子电池提供了一条前景广阔的道路。
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来源期刊
Nano Energy
Nano Energy CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
30.30
自引率
7.40%
发文量
1207
审稿时长
23 days
期刊介绍: Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem. Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.
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