4.8 Article

Polyphenylene Sulfide-Based Solid-State Separator for Limited Li Metal Battery

Journal

SMALL
Volume 17, Issue 51, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202104365

Keywords

dry electrode; high-crystallized; PE-protection; polyphenylene sulfide; solid-state separator

Funding

  1. National Natural Science Foundation of China [51702131, 51774151]
  2. Natural Science Foundation of Jiangsu Provence, China [SBK2017041705]
  3. Norway-Jiangsu Industrial RD Program [BZ2019021]
  4. Institute of Green Materials and Metallurgy, Jiangsu University [5501670001, 5501670002]

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The study introduces a solid state separator made of lithiated polyphenylene sulfide and functionalized to improve Li+ transference, allowing lithium metal batteries to achieve higher energy and power densities under high loadings and voltages.
The urgent need for high energy batteries is pushing the battery studies toward the Li metal and solid-state direction, and the most central question is finding proper solid-state electrolyte (SSE). So far, the recently studied electrolytes have obvious advantages and fatal weaknesses, resulting in indecisive plans for industrial production. In this work, a thin and dense lithiated polyphenylene sulfide-based solid state separator (PPS-SSS) prepared by a solvent-free process in pilot stage is proposed. Moreover, the PPS surface is functionalized to immobilize the anions, increasing the Li+ transference number to 0.8-0.9, and widening the electrochemical potential window (EPW > 5.1 V). At 25 degrees C, the PPS-SSS exhibits high intrinsic Li+ diffusion coefficient and ionic conductivity (>10(-4) S cm(-1)), and Li+ transport rectifying effect, resulting in homogenous Li-plating on Cu at 2 mA cm(-2) density. Based on the limited Li-plated Cu anode or anode-free Cu, high loadings cathode and high voltage, the Li-metal batteries (LMBs) with polyethylene (PE) protected PPS-SSSs deliver high energy and power densities (>1000 Wh L-1 and 900 W L-1) with >200 cycling life and high safety, exceeding those of state-of-the-art Li-ion batteries. The results promote the Li metal battery toward practicality.

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