Stepwise Hollow Prussian Blue Nanoframes/Carbon Nanotubes Composite Film as Ultrahigh Rate Sodium Ion Cathode,Advanced Functional Materials

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Stepwise Hollow Prussian Blue Nanoframes/Carbon Nanotubes Composite Film as Ultrahigh Rate Sodium Ion Cathode
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-07-15 , DOI: 10.1002/adfm.202002624
Ping Wan ₁ , Hui Xie ₂ , Nan Zhang ₁ , Shuang Zhu ₁ , Changda Wang ₁ , Zhen Yu ₁ , Wangsheng Chu ₁ , Li Song ₁ , Shiqiang Wei ₁

Affiliation

Prussian blue and its analogues (PBAs) have been proposed as promising cathode materials for sodium‐ion batteries (SIBs) due to high theoretical capacity and low cost, but they often suffer from poor electronic conductivity and structural instability. Herein, a stepwise hollow cubic framework structure is first designed and a hybridized hierarchical film synthesized from single‐crystal PBA nanoframes/carbon nanotubes (CNTs) composite is demonstrated as a binder‐free ultrahigh rate sodium ion cathode. This hierarchical configuration offers improved tolerance for lattice expansion, reduced sodium ion diffusion path, enhanced electronic conductivity, and optimized redox reactions, thereby achieving the excellent rate capability, high specific capacity, and long cycle life. As expected, the developed FeHCFe nanoframes/CNTs electrode film exhibits a super high rate capacity of 149.2 mAh g⁻¹ at 0.1C and 35.0 mAh g⁻¹ at 100C. Moreover, it displays an excellent cycling stability with about 92% capacity retention at 5C after 500 cycles. This work will pave a new way to engineer advanced electrode materials for ultrahigh rate SIBs.

中文翻译：

逐步空心普鲁士蓝色纳米框架/碳纳米管复合膜作为超高速率钠离子阴极

普鲁士蓝及其类似物（PBA）由于具有较高的理论容量和低成本而被提出作为钠离子电池（SIB）的有前途的阴极材料，但它们经常遭受不良的电子导电性和结构不稳定的困扰。在此，首先设计了逐步空心立方框架结构，并证明了由单晶PBA纳米框架/碳纳米管（CNT）复合材料合成的杂化层状膜作为无粘合剂超高速率钠离子阴极。这种分层配置可提高晶格扩展的耐受性，减少钠离子扩散路径，增强电子电导率和优化氧化还原反应，从而实现出色的速率能力，高比容量和长循环寿命。不出所料在0.1C下为^-1和在100C下为35.0 mAh g ^-1。此外，它显示了出色的循环稳定性，经过500次循环后，在5C下的容量保持率约为92％。这项工作将为工程用于超高速率SIB的先进电极材料铺平道路。

更新日期：2020-09-18

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