期刊
ADVANCED ENERGY MATERIALS
卷 10, 期 35, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202001683
关键词
conductive polymers; continuous catalytic films; flexible batteries; lithium-sulfur batteries; shuttle effect
类别
资金
- National Natural Science Foundation of China [51902089, 21773059, 21873026]
- China Postdoctoral Science Foundation [2018M640676]
The main challenge in developing foldable Li-S batteries (LSB) lies in developing an electrode that is ultraflexible, conductive, and catalytic for dissolved lithium polysulfides (LiPSs). In this paper, lightweight macromolecule graphitic carbon nitride (g-C3N4) film and a conductive polymer (CP) of poly(3,4-ethylenedioxythiophene) shell are introduced into flexible LSBs by compositing with carbon cloth (CC). In the designed hybrid of CP/g-C3N4@CC, 2D g-C(3)N(4)is used in the form of an effective trapper and functions as a continuous catalytic layer for LiPSs via the formation of pyridinic-N-Li bonds. This is revealed by both experimental investigations and theoretical analysis. The sandwich-like CC and CP simultaneously bring an omnidirectional conductive network for fast interfacial reaction kinetics. With these benefits, the self-supported CP/g-C3N4@CC forms a powerful interaction system to fully in situ lock LiPSs in the commercial CC matrix. Thus, a substantially enhanced electrochemical performance is obtained at a high sulfur loading (4.7 mg cm(-2)) even operating in a pouch cell. This work may provide a potential avenue for practical use of high-performance LSBs toward flexible energy-storage devices.
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