4.8 Article

Scalable Production of Wearable Solid-State Li-Ion Capacitors from N-Doped Hierarchical Carbon

Journal

ADVANCED MATERIALS
Volume 32, Issue 45, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202005531

Keywords

flexible devices; lithium-ion capacitors; nitrogen-doped hierarchical carbon; self-propagating high-temperature synthesis; wearable devices

Funding

  1. National Science Foundation of China [51822706, 51777200]
  2. Beijing Natural Science foundation [JQ19012]
  3. DNL Cooperation Fund, CAS [DNL201912, DNL201915]
  4. Youth Innovation Promotion Association, CAS [2017177]
  5. Beijing Municipal Science and Technology Commission [Z181100000118006]

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Smart and wearable electronics have aroused substantial demand for flexible portable power sources, but it remains a large challenge to realize scalable production of wearable batteries/supercapacitors with high electrochemical performance and remarkable flexibility simultaneously. Here, a scalable approach is developed to prepare wearable solid-state lithium-ion capacitors (LICs) with superior performance enabled by synergetic engineering from materials to device architecture. Nitrogen-doped hierarchical carbon (HC) composed of 1D carbon nanofibers welded with 2D carbon nanosheets is synthesized via a unique self-propagating high-temperature synthesis (SHS) technique, which exhibits superior electrochemical performance. Subsequently, inspired by origami, here, wave-shaped LIC punch-cells based on the above materials are designed by employing a compatible and scalable post-imprint technology. Finite elemental analysis (FEA) confirms that the bending stress of the punch-cell can be offset effectively, benefiting from the wave architecture. The wearable solid-state LIC punch-cell exhibits large energy density, long cyclic stability, and superior flexibility. This study demonstrates great promise for scalable fabrication of wearable energy-storage systems.

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