4.8 Article

PVDF-HFP layer with high porosity and polarity for high-performance lithium metal anodes in both ether and carbonate electrolytes

Journal

NANO ENERGY
Volume 95, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.nanoen.2022.107009

Keywords

PVDF-HFP; Interfacial layer; LiF; Li metal anodes; Ether electrolyte; Carbonate electrolyte

Funding

  1. National Nat-ural Science Foundation of China [21805061, 21721002]
  2. International Partnership Program of the Chinese Academy of Sciences [121D11KYSB20190080]
  3. K.C. Wong Education Foundation
  4. Chinese Academy of Sciences

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The use of a high-polarity porous PVDF-HFP layer as an interfacial layer can achieve dendrite-free and stable lithium metal anodes, with high mechanical strength and good Li-ion flux regulation capability. Such a structure can enhance the stability of lithium metal, as well as improve reversibility and cyclic stability.
Lithium metal batteries hold great promise for high-energy-density rechargeable battery systems. However, Li metal anode suffer from poor stability and safety hazards in liquid electrolytes due to uncontrollable Li dendrites growth and unstable solid-electrolyte interphase (SEI). Herein, this work constructs a porous PVDF-HFP layer (PPHL) with high polarity as interfacial layer for dendrite-free and stable Li metal anodes in both ether and carbonate electrolytes. PPHL can not only physically suppress the Li dendrites owing to high mechanical strength, but also regulate the even Li-ion flux due to porous and highly polar beta phase structure. LiF-rich SEI induced by PPHL is found responsible to enhance the stability of SEI and improve Li-ion diffusion for stable Li plating/stripping behaviors. Therefore, Li metal with PPHL shows uniform and dense Li deposition without Li dendrites. Li/Li symmetric cells exhibit high stability and reversibility in ether electrolyte for 1400 h and carbonate electrolyte for 600 h with high Li-ion transference number. Li//LFP full battery shows excellent cyclic stability and rate performance with high capacity retention in commercial carbonate electrolyte.

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