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Highly stable lithium anode enabled by self-assembled monolayer of dihexadecanoalkyl phosphate

  • Lei Zheng
  • Feng Guo
  • Tuo Kang
  • Jin Yang
  • Ya Liu
  • Wei Gu
  • Yanfei Zhao
  • Hongzhen Lin
  • Yanbin ShenEmail author
  • Wei Lu
  • Liwei ChenEmail author
Research Article
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Abstract

Li has been considered as the ultimate anode material for high energy density secondary Li batteries. However, its practical application has been limited due to its low Coulombic efficiency (CE) and the formation of lithium dendrites. Recently, we have developed a microspherical Li-carbon nanotube (Li-CNT) composite material passivated with octadecylphosphonic acid (OPA) self-assembled monolayer (SAM) exhibiting suppressed lithium dendrite formation and improved environmental/electrochemical stability. In this work, we demonstrated the significantly enhanced passivation effects of a SAM using dihexadecanoalkyl phosphate (DHP), a molecule that is comprised of double hydrophobic alkyl chains and forms a denser SAM on surfaces with large curvature. As a result, the DHP SAM delivers superior environmental and electrochemical stability to the OPA passivated Li-CNT material. In specific, the DHP passivated Li-CNT composite (DHP-Li-CNT) delivers a high CE of 99.25% under a 33.3% depth of discharge (DOD) at 1 C, when it is paired with a LiFePO4 cathode. The evolution of the SAM during cycling and the effects of DOD and current density on the CE of the DHP-Li-CNT anode have also been investigated. The improved SAM passivation constitutes an important step in achieving the goal of practically applicable Li anodes.

Keywords

Li metal anode Li-CNT self-assembled monolayer depth of discharge Coulombic efficiency 

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Notes

Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 21625304 and 21733012), the “Strategic Priority Research Program” of Chinese Academy of Sciences (No. XDA09010600), and the Ministry of Science and Technology (No. 2016YFA0200703).

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Highly stable lithium anode enabled by self-assembled monolayer of dihexadecanoalkyl phosphate

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Lei Zheng
    • 1
    • 2
  • Feng Guo
    • 1
    • 2
  • Tuo Kang
    • 2
  • Jin Yang
    • 2
  • Ya Liu
    • 2
  • Wei Gu
    • 2
  • Yanfei Zhao
    • 3
  • Hongzhen Lin
    • 2
  • Yanbin Shen
    • 2
    Email author
  • Wei Lu
    • 2
  • Liwei Chen
    • 2
    • 4
    Email author
  1. 1.School of Nano Technology and Nano BionicsUniversity of Science and Technology of ChinaHefeiChina
  2. 2.i-Lab, CAS Center for Excellence in Nanoscience, Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhouChina
  3. 3.Vacuum Interconnected Nanotech Workstation (Nano-X), Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO)Chinses Academy of Science (CAS)SuzhouChina
  4. 4.In-situ Center for Physical Sciences, School of Chemistry and Chemical EngineeringShanghai Jiaotong UniversityShanghaiChina

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