4.8 Article

Wax-Transferred Hydrophobic CVD Graphene Enables Water-Resistant and Dendrite-Free Lithium Anode toward Long Cycle Li-Air Battery

期刊

ADVANCED SCIENCE
卷 8, 期 16, 页码 -

出版社

WILEY
DOI: 10.1002/advs.202100488

关键词

artificial solid/electrolyte interphase; chemical vapor depositio-grown graphene; lithium-air batteries; water-resistant anodes

资金

  1. National Natural Science Foundation of China [22075193, 22072101, 51911540473]
  2. Natural Science Research Project of Jiangsu Higher Education Institutions of China [18KJA480004]
  3. Key Technology Initiative of Suzhou Municipal Science and Technology Bureau [SYG201934]
  4. Six Talent Peaks Project in Jiangsu Province [TD-XCL-006]
  5. Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions

向作者/读者索取更多资源

A tactic for water-resistant Li anode by implementing a wax-assisted transfer protocol is reported, using a high-quality CVD graphene layer to passivate the Li surface. The graphene coating serves as an artificial SEI, guiding homogeneous Li plating/stripping and protecting the Li surface from moisture erosion. The passivated Li anodes demonstrate superb cycling performance in lithium-air batteries, showing excellent air and electrochemical stability.
One of the key challenges in achieving practical lithium-air battery is the poor moisture tolerance of the lithium metal anode. Herein, guided by theoretical modeling, an effective tactic for realizing water-resistant Li anode by implementing a wax-assisted transfer protocol is reported to passivate the Li surface with an inert high-quality chemical vapor deposition (CVD) graphene layer. This electrically conductive and mechanically robust graphene coating enables serving as an artificial solid/electrolyte interphase (SEI), guiding homogeneous Li plating/stripping, suppressing dendrite and dead Li formation, as well as passivating the Li surface from moisture erosion and side reactions. Consequently, lithium-air batteries fabricated with the passivated Li anodes demonstrate a superb cycling performance up to 2300 h (230 cycles at 1000 mAh g(-1), 200 mA g(-1)). More strikingly, the anode recycled thereafter can be recoupled with a fresh cathode to continuously run for 400 extended hours. Comprehensive time-lapse and ex situ microscopic and spectroscopic investigations are further carried out for elucidating the fundamentals behind the extraordinary air and electrochemical stability.

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