Free-standing β-Ta2O5/SWCNTs composite film for high-rate Li-ion storage

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外文摘要：The rapid development of portable and wearable electronic devices is responding to the urgent demand for high-efficiency flexible energy storage devices.Flexible supercapacitors,showing long cycle life,high power density,and good safety,are considered ideal candidates.Nevertheless,the relatively low energy density restricts their practical applications.With a large dielectric constant of 18-46,Ta2O5-based materials typically exhibit excellent electron-binding ability,which is critical for enhancing the energy density of supercapacitors.In this work,the free-standing β-Ta2O5/single-walled carbon nanotubes(SWCNTs)composite film was prepared,with a high β-Ta2O5 loading of over 70％.By anchoring β-Ta2O5 nanoparticles onto the surface of SWCNTs,the system's flexibility and conductivity were significantly enhanced,which also facilitated the inter-calation electrodynamics of metal cations.As a result,the flexible β-Ta2O5/SWCNTs film exhibits excellent Li-ion storage performance,with a high volumetric specific capacitance of 392.3 F cm-3 at the scan rate of 10 mV s-1 and 198.9 F cm-3 at 500 mV s-1.In addition,the asymmetric device,assembled by the β-Ta2O5/SWCNTs and activated carbon films,shows a high energy density of 45.5 Wh kg 1 at the power density of 10.8 kW kg-1.This technique opens up a new avenue for improving the energy density and rate performance of flexible supercapacitors.

外文关键词：

pseudocapacitorLi-ion storageβ-Ta2O5/SWCNTs filmflexible devicehigh-rate capability

作者：

WU ZhiMin、LIU JiaJia、HE XingYu、BIAN Jing、ZHU XianJun、CHEN JianMei、LI JianMin

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作者单位：

College of Electronic and Optical Engineering & College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,China

Department of Pathology,College of Medicine,University of Cincinnati,Cincinnati,OH 45267 USA

基金：

National Natural Science Foundation of ChinaNatural Science Foundation of Jiangsu Province of ChinaNanjing Science and Technology Innovation Project for Overseas StudentsStartup Funding from NUPTSF

项目编号：

22105106BK20210603NJKCZYZZ2022-05NY221003

出版年：

2024

DOI：

10.1007/s11431-023-2522-y

中国科学:技术科学(英文版)

中国科学院

中国科学:技术科学(英文版)

CSTPCDEI

影响因子：1.056

ISSN：1674-7321

年,卷(期)：2024.67(2)

参考文献量58