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Binder‐Free Electrodes with High Energy Density and Excellent Flexibility Enabled by Hierarchical Configuration for Wearable Lithium Ion Batteries
Author(s) -
Li Shaoqing,
Zhou Weiya,
Xia Xiaogang,
Lu Zhao,
Chen Penghui,
Wang Zibo,
Xiao Zhuojian,
Xi Wei,
Wang Yanchun,
Rao Guanghui,
Xie Sishen
Publication year - 2021
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.202001262
Subject(s) - electrode , materials science , lithium (medication) , flexibility (engineering) , nanotechnology , electrochemistry , power density , wearable computer , carbon nanotube , energy storage , energy density , optoelectronics , power (physics) , computer science , engineering physics , chemistry , engineering , mathematics , embedded system , medicine , statistics , physics , quantum mechanics , endocrinology
There is strong demand for higher energy density and flexible lithium ion batteries recently. Unfortunately, electrodes built by conventional methods cannot meet these requirements simultaneously due to the large amount of inactive additives needed for sufficient flexibility. Herein, by utilizing a continuous single‐walled carbon nanotube reticulation and designing an all‐in‐one hierarchical configuration, binder‐free electrodes are fabricated via an in situ integration procedure. The electrode exhibits excellent electrochemical performance against up to 20 000 cycles of bending and high energy density (up to 493 Wh kg −1 electrode and 820 Wh L −1 electrode ). The hierarchical configuration takes full diverse advantages of different carbon nanostructures. The as‐obtained novel binder‐free electrodes exhibit not only good cyclability (up to ≈90% capacity retentions after 1500 cycles) with only 4 wt% additive materials, but also show enhanced kinetic process, in comparison to those of traditional electrodes. Furthermore, based on the as‐designed electrodes, flexible cells are assembled and a practical wearable system is fabricated, manifesting that they can be used in a stable and flexible power supply for smart systems.