A nanoarchitectured Na6Fe5(SO4)8/CNTs cathode for building a low-cost 3.6V sodium-ion full battery with superior sodium storage
A nanoarchitectured Na6Fe5(SO4)8/CNTs cathode for building a low-cost 3.6V sodium-ion full battery with superior sodium storage
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纳米结构的 Na6Fe5(SO4)(8)/CNTs 阴极，用于构建具有优异钠存储能力的低成本 3.6V 钠离子全电池
DOI：
10.1039/c9ta03089a
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发表时间：
2019-06-28
影响因子：
11.9
通讯作者：
Gao, Lijun
中科院分区：
文献类型：
--
作者：
Li, Shiyu;Song, Xiaosheng;Gao, Lijun
以Na 6 Fe 5（SO 4）（8）硫酸盐为正极材料，碳纳米管（NFS@5%CNTs）为负极材料，硬碳（HC）为负极材料，制备了高电压钠离子全电池。这种全NFS@5%CNTs//HC电池提供了3.6 V的实际工作电压和接近350 W h kg（-1）的令人印象深刻的能量密度，并且在2C下1000次循环后可以保持61.8 mA h g（-1）的比容量。全电池的该实施例的上级钠存储性能归因于Na 6 Fe 5（SO 4）（8）阴极材料，其在结构上与导电CNT组分整合。CNT添加剂被紧密注入并贯穿整个NFS本体，从而在钠离子的可逆嵌入/脱嵌期间改善了NFS@x%CNT阴极材料的电化学性能。NFS@x%CNT阴极材料的优化CNT含量被评估为5重量%，导致在0.1和2C下分别为110.2和86.4 mA h g（-1）的高初始容量。本工作介绍了一种新的硫酸铁钠衍生物作为钠离子电池的高能阴极材料，同时提供了一种有效的CNT辅助方法来提高电化学性能。进一步开发了具有高工作电压和高能量/功率密度的全钠离子电池，以用于实际的大规模应用。
A high-voltage sodium-ion full battery has been assembled based on Na6Fe5(SO4)(8) sulfate structurally integrated with 5 wt% carbon nanotubes (NFS@5%CNTs) acting as the cathode material, with commercialized hard carbon (HC) as the anode material. This full NFS@5%CNTs//HC cell delivers a practical working voltage of 3.6 V and an impressive energy density approaching 350 W h kg(-1), and it can retain a specific capacity of 61.8 mA h g(-1) after 1000 cycles at 2C. The superior sodium storage performance of this example of a full battery is attributed to the Na6Fe5(SO4)(8) cathode material, which is structurally integrated with a conductive CNT component. The CNT additive is tightly implanted and runs through the whole NFS bulk, improving the electrochemical performance of NFS@x%CNTs cathode materials during the reversible intercalation/deintercalation of sodium ions. The optimized CNT content for NFS@x%CNTs cathode materials is evaluated to be 5 wt%, resulting in high initial capacities of 110.2 and 86.4 mA h g(-1) at 0.1 and 2C, respectively. This work introduces a new derivative of sodium iron sulfates to act as a high-energy cathode material for sodium ion batteries, together with offering an effective CNT-assisted method for enhancing electrochemical performance. A full sodium-ion battery is further developed with a high working voltage and high energy/power densities for practical large-scale applications.