Journal
ADVANCED MATERIALS
Volume 30, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201801213
Keywords
alkali metals; dendrites; graphene oxide; Li-metal batteries; spraying
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Funding
- National Natural Science Foundation of China [51674202, 51402236, 51521061, 51720105014]
- Fundamental Research Funds for the Central Universities [G2016KY0307]
- Key RAMP
- D Program of Shaanxi [2017ZDCXL-GY-08-03]
- TOP International University Visiting Program for Outstanding Young Scholars of Northwestern Polytechnical University
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Li-metal batteries (LiMBs) are experiencing a renaissance; however, achieving scalable production of dendrite-free Li anodes for practical application is still a formidable challenge. Herein, a facile and universal method is developed to directly reduce graphene oxide (GO) using alkali metals (e.g., Li, Na, and K) in moderate conditions. Based on this innovation, a spontaneously reduced graphene coating can be designed and modulated on a Li surface (SR-G-Li). The symmetrical SR-G-Li|SR-G-Li cell can run up to 1000 cycles at a high practical current density of 5 mA cm(-2) without a short circuit, demonstrating one of the longest lifespans reported with LiPF6-based carbonate electrolytes. More significantly, a practically scalable paradigm is established to fabricate dendrite-free Li anodes by spraying a GO layer on the Li anode surface for large-scale production of LiFePO4/Li pouch cells, reflected by the continuous manufacturing of the SR-G-Li anodes based on the roll-to-roll technology. The strategy provides new commercial opportunities to both LiMBs and graphene.
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