A hierarchical glucose-intercalated NiMn-G-LDH@NiCo2S4 core-shell structure as a binder-free electrode for flexible all-solid-state asymmetric supercapacitors

Shixia Chen, Chengxi Lu, Lu Liu, Mai Xu, Jun Wang, Qiang Deng, Zheling Zeng, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Flexible, lightweight, and high-energy-density asymmetric supercapacitors (ASCs) are highly attractive for portable and wearable electronics. However, the implementation of such flexible ASCs is still hampered by the low specific capacitance and sluggish reaction kinetics of the electrode materials. Herein, a hierarchical core-shell structure of hybrid glucose intercalated NiMn-LDH (NiMn-G-LDH)@NiCo2S4 hollow nanotubes is deliberately constructed on flexible carbon fiber cloth (CFC). The highly conductive hollow NiCo2S4 nanotube arrays can not only provide high-speed pathways for ion and electrolyte transfer but also regulate the growth of NiMn-G-LDH nanosheets. The expanded interlayer distance on NiMn-G-LDH nanosheets could further facilitate ion diffusion and improve the rate retention. Benefiting from the rational engineering, the flexible NiMn-G-LDH@NiCo2S4@CFC as a free-standing electrode could deliver a superior specific capacity of 1018 C g-1 at 1 A g-1, which is almost twice higher than that of pristine NiCo2S4@CFC. In addition, the as-assembled flexible all-solid-state ASC device (NiMn-G-LDH@NiCo2S4@CFC//AC) is capable of working at various bending angles and exhibits an impressive energy density of 60.3 W h kg-1 at a power density of 375 W kg-1, as well as a superior cycling stability of 86.4% after 10;000 cycles.

Original languageEnglish (US)
Pages (from-to)1852-1863
Number of pages12
JournalNanoscale
Volume12
Issue number3
DOIs
StatePublished - Jan 21 2020

ASJC Scopus subject areas

  • Materials Science(all)

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