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(001) Facet-Dominated Hierarchically Hollow Na2Ti3O7 as a High-Rate Anode Material for Sodium-Ion Capacitors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-11-01 , DOI: 10.1021/acsami.9b14560
Hao Chen 1 , Yuanke Wu 1 , Jingjing Duan 2 , Renming Zhan 1 , Wei Wang 1 , Min-Qiang Wang 1 , Yuming Chen 3 , Maowen Xu 1 , Shu-Juan Bao 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-11-01 , DOI: 10.1021/acsami.9b14560
Hao Chen 1 , Yuanke Wu 1 , Jingjing Duan 2 , Renming Zhan 1 , Wei Wang 1 , Min-Qiang Wang 1 , Yuming Chen 3 , Maowen Xu 1 , Shu-Juan Bao 1
Affiliation
Sodium-ion capacitors (SICs) have shown great potential to combine the merits of high-power capability of traditional capacitors and high energy capability of batteries. However, the sluggish kinetics and inferior stability of conventional sodium-ion storage anode materials are major challenges for the practical utilization of SICs. In this work, interconnected urchin-like hollow Na2Ti3O7 (Na2Ti3O7-IcUH) chains were designed and prepared by a simple one-step template-assisting method. Through a variety of controlled experiments, we explored how to effectively engineer the crystal-oriented growth and string the urchin-like spheres together. Benefiting from its urchin-like hollow structure and fully exposed (001) facet, the resulting Na2Ti3O7-IcUH exhibits a superior rate capability of 96.2 mA h g–1 at 5 A g–1. Meanwhile, the interconnected three-dimensional primary structure endows Na2Ti3O7-IcUH with excellent cyclic stability (15% capacity loss at 5 A g–1 after 2000 cycles). By coupling with commercial active carbon, the assembled SIC successfully demonstrates a energy density of 134.3 W h kg–1 at a power density of 125 W kg–1 and 38.2 W h kg–1 at a high-power density of 2500 W kg–1, as well as a superior capacity retention of 75% after 2000 cycles at 2 A g–1 within 1–4 V.
中文翻译:
(001)面主导的分层空心Na 2 Ti 3 O 7作为钠离子电容器的高速阳极材料
钠离子电容器(SIC)具有巨大的潜力,可以将传统电容器的高功率能力与电池的高能量能力相结合。然而,常规钠离子存储阳极材料的缓慢动力学和较差的稳定性是实际使用SIC的主要挑战。在这项工作中,互连的类似海胆的空心Na 2 Ti 3 O 7(Na 2 Ti 3 O 7-IcUH)链是通过简单的一步模板辅助方法设计和制备的。通过各种受控实验,我们探索了如何有效地设计晶体取向的生长并将类海胆球串在一起的方法。得益于其类似海胆的空心结构和充分暴露的(001)面,所得的Na 2 Ti 3 O 7 -IcUH在5 A g –1的条件下具有96.2 mA hg –1的超高倍率能力。同时,互连的三维一级结构赋予Na 2 Ti 3 O 7 -IcUH出色的循环稳定性(在5 A g –1时容量损失为15%)2000个周期后)。通过与商业活性炭耦合,组装的SIC成功证明134.3 W时千克的能量密度-1在125瓦kg的功率密度-1和38.2 W时千克-1处的2500W的kg的高功率密度- 1,以及在2-4 V范围内以2 A g –1进行2000次循环后,仍具有75%的出色容量保持率。
更新日期:2019-11-01
中文翻译:
(001)面主导的分层空心Na 2 Ti 3 O 7作为钠离子电容器的高速阳极材料
钠离子电容器(SIC)具有巨大的潜力,可以将传统电容器的高功率能力与电池的高能量能力相结合。然而,常规钠离子存储阳极材料的缓慢动力学和较差的稳定性是实际使用SIC的主要挑战。在这项工作中,互连的类似海胆的空心Na 2 Ti 3 O 7(Na 2 Ti 3 O 7-IcUH)链是通过简单的一步模板辅助方法设计和制备的。通过各种受控实验,我们探索了如何有效地设计晶体取向的生长并将类海胆球串在一起的方法。得益于其类似海胆的空心结构和充分暴露的(001)面,所得的Na 2 Ti 3 O 7 -IcUH在5 A g –1的条件下具有96.2 mA hg –1的超高倍率能力。同时,互连的三维一级结构赋予Na 2 Ti 3 O 7 -IcUH出色的循环稳定性(在5 A g –1时容量损失为15%)2000个周期后)。通过与商业活性炭耦合,组装的SIC成功证明134.3 W时千克的能量密度-1在125瓦kg的功率密度-1和38.2 W时千克-1处的2500W的kg的高功率密度- 1,以及在2-4 V范围内以2 A g –1进行2000次循环后,仍具有75%的出色容量保持率。