Targeted design strategies for a highly activated carbon cloth cathode/anode to construct flexible and cuttable sodium Ion capacitors with an all-woven-structure†

IF 30.8 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Ying-Ying Wang, Zhong-Yuan Wang, Yu-Juan Xu, Wei-Hua Chen, Guo-Sheng Shao and Bao-Hua Hou
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Abstract

Carbon cloth (CC) is a promising flexible substrate to construct flexible electrodes. However, commercial CC suffers from high price, large dead weight/volume and poor electrochemical activity, severely affecting the energy/power density of energy storage devices. Herein, both a porous CC (PCC) cathode and hard carbon CC (HCC) anode are rationally designed and prepared via targeted strategies using scalable and renewable cotton cloth. The full microporous structure of PCC ensures a complete self-supporting structure, large specific surface area and high performance based on PF6. The non-porous structure with localized graphitic nanodomains of HCC contributes efficient sodium storage comparable to that of a capacitor with better flexibility. Consequently, both the PCC cathode and HCC anode realize high reversible capacity, outstanding rate capability, and ultralong cycling life in the half/full cell of a sodium ion capacitor system. More significantly, a flexible all-cloth sodium ion capacitor is assembled using the PCC cathode, HCC anode and cotton cloth separator, which provides stable power output even under bending and cutting conditions owing to its all-woven-structure. In addition, the structural design strategy, structure–activity relationship, and charge/discharge mechanism of CC electrodes are studied in detail, providing a constructive view for developing low-cost CC-based electrodes with high energy storage activity.

Abstract Image

构建柔性可切割全编织结构钠离子电容器的高活性碳布阴极/阳极的针对性设计策略
碳布(CC)是一种很有前途的柔性基材,可用于构建柔性电极。然而,商用碳布存在价格高、自重/体积大、电化学活性差等问题,严重影响了储能设备的能量/功率密度。在此,我们利用可扩展和可再生的棉布,通过有针对性的策略合理设计和制备了多孔CC(PCC)阴极和硬碳CC(HCC)阳极。其中,PCC 的全微孔结构确保了完整的自支撑结构、大比表面积和基于 PF6- 的高性能。具有局部石墨纳米域的无孔结构的 HCC 则有助于实现与电容器相当的高效钠存储,并具有更好的灵活性。因此,在钠离子电容器系统的半电池/全电池中,PCC 阴极和 HCC 阳极都能实现高可逆容量、出色的速率能力和超长的循环寿命。更重要的是,利用 PCC 阴极、HCC 阳极和棉布隔板组装了柔性全布钠离子电容器,由于其全编织结构,即使在弯曲和切割条件下也能提供稳定的功率输出。此外,还详细研究了 CC 电极的结构设计策略、结构-活性关系和充放电机理,为开发具有高储能活性的低成本 CC 基电极提供了建设性意见。
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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