4.8 Article

In Situ Designing a Gradient Li+ Capture and Quasi-Spontaneous Diffusion Anode Protection Layer toward Long-Life Li-O2 Batteries

期刊

ADVANCED MATERIALS
卷 32, 期 38, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202004157

关键词

anticorrosion; dendrite suppression; Li-O(2)battery; lithium metal anode; protection layer

资金

  1. National Key RAMP
  2. D Program of China [2016YFB0100103]
  3. National Natural Science Foundation of China [21725103]
  4. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21010210]
  5. Jilin Province Science and Technology Development Plan Funding Project [20180101203JC, 20200201079JC]
  6. Changchun Science and Technology Development Plan Funding Project [19SS010]

向作者/读者索取更多资源

Lithium metal is the only anode material that can enable the Li-O(2)battery to realize its high theoretical energy density (approximate to 3500 Wh kg(-1)). However, the inherent uncontrolled dendrite growth and serious corrosion limitations of lithium metal anodes make it experience fast degradation and impede the practical application of Li-O(2)batteries. Herein, a multifunctional complementary LiF/F-doped carbon gradient protection layer on a lithium metal anode by one-step in situ reaction of molten Li with poly(tetrafluoroethylene) (PTFE) is developed. The abundant strong polar C-F bonds in the upper carbon can not only act as Li(+)capture site to pre-uniform Li(+)flux but also regulate the electron configuration of LiF to make Li(+)quasi-spontaneously diffuse from carbon to LiF surface, avoiding the strong Li+-adhesion-induced Li aggregation. For LiF, it can behave as fast Li(+)conductor and homogenize the nucleation sites on lithium, as well as ensure firm connection with lithium. As a result, this well-designed protection layer endows the Li metal anode with dendrite-free plating/stripping and anticorrosion behavior both in ether-based and carbonate ester-based electrolytes. Even applied protected Li anodes in Li-O(2)batteries, its superiority can still be maintained, making the cell achieve stable cycling performance (180 cycles).

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