Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 38, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902001
Keywords
electrospun nanofibers; flexible; high-loading; lithium-sulfur batteries; three-in-one
Categories
Funding
- Natural Science Foundation of China [51803164, 51773165]
- China Postdoctoral Science Foundation [2018M643635]
- Natural Science Foundation of Shaanxi Province [2019JQ-126]
- Young Talent Support Plan of Xi'an Jiaotong University
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Lithium-sulfur batteries are appealing as high-energy storage systems and hold great application prospects in wearable and portable electronics. However, severe shuttle effects, low sulfur conductivity, and especially poor electrode mechanical flexibility restrict sulfur utilization and loading for practical applications. Herein, high-flux, flexible, electrospun fibrous membranes are developed, which succeed in integrating three functional units (cathode, interlayer, and separator) into an efficient composite. This structure helps to eliminate negative interface effects, and effectively drives synergistic boosts to polysulfide confinement, electron transfer, and lithium-ion diffusion. It delivers a high initial capacity of 1501 mA h g(-1) and a discharge capacity of 933 mA h g(-1) after 400 cycles, with slow capacity attenuation (0.069% per cycle). Even under high sulfur loading (13.2 mg cm(-2), electrolyte/sulfur ratio = 6 mL g(-1)) or in an alternative folded state, this three-in-one membrane still exhibits high areal capacity (11.4 mA h cm(-2)) and exceptional application performance (powering an array of over 30 light-emitting diodes (LEDs)), highlighting its huge potential in high-energy flexible devices.
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