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In-situ Construction of a Hybrid Interfacial Protective Layer for Highly Stable Li Metal Anodes
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  • Shunqiong Jiang,
  • Wei Ying Lieu,
  • Xue Liang Li,
  • Daliang Fang,
  • Siew Lang Teo,
  • Yifan Li,
  • Zhi Wei Seh,
  • Bingbing Tian,
  • Yumeng Shi,
  • Hui Ying Yang
Shunqiong Jiang
Singapore University of Technology and Design
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Wei Ying Lieu
Singapore University of Technology and Design
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Xue Liang Li
Singapore University of Technology and Design
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Daliang Fang
Singapore University of Technology and Design
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Siew Lang Teo
Singapore University of Technology and Design
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Yifan Li
Singapore University of Technology and Design
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Zhi Wei Seh
Institute of Materials Research and Engineering
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Bingbing Tian
Shenzhen University
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Yumeng Shi
Singapore University of Technology and Design
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Hui Ying Yang
Singapore University of Technology and Design

Corresponding Author:[email protected]

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Abstract

Lithium (Li) metal is an ideal anode candidate for rechargeable batteries because of its ultra-high theoretical specific capacity. Unfortunately, the practical application of Li metal anodes is severely limited by the uncontrollable formation and growth of dendrites and infinite volume expansion. Thus, a protective layer is essential for stable and high-performance Li metal anodes. In this work, we demonstrate an organic-inorganic hybrid interfacial protective layer on Li foil surface (pa-Li) consisting of the organic polyvinylidene fluoride-hexafluoropropylene copolymer(PVDF-HFP)and inorganic Ag-LixAgy composite species. Going beyond conventional protective layers, we demonstrate that our hybrid protective layer is flexible and enabled strong interfacial adherence due to an alloying process. Furthermore, owing to the protective layer’s outstanding lithiophilicity and mechanical stability, the pa-Li││pa-Li symmetric cell exhibits satisfactory stability and reversibility for 1000 h at 5 mA cm-2, 5 mA h cm-2 with a low voltage hysteresis of ~ 70 mV, while the full cell with a LiFePO4 cathode delivers an excellent reversible capacity of 128.9 mA h g-1 for 900 cycles at 2 C with a capacity decay rate of 0.009% per cycle. This work proposes a design protocol for synergistic effect of PVDF-HFP organic species and Ag-LixAgy inorganic species and provides a prospective way to practical application of highly efficient, long lifespan Li metal batteries.