A composite solid electrolyte with a framework of vertically aligned perovskite for all-solid-state Li-metal batteries

Ke Liu, Maochun Wu, Lei Wei, Yanke Lin, Tianshou Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

Composite solid electrolytes (CSEs), which inherit the flexibility of polymer electrolytes and the high ionic conductivity of ceramic electrolytes, hold a great potential to realize all-solid-state Li-metal batteries (ASSLMBs) with high energy density and enhanced safety. However, conventional preparation methods for CSEs by randomly dispersing ceramic particles in a polymer matrix fail to provide effective Li+ conducting networks, thus severely sacrificing the high ionic conductivity of ceramic fillers. In this work, we develop a framework of vertically aligned perovskite Li0.33La0.557TiO3 (LLTO) embedded in a PEO-LiTFSI matrix to maximize the ionic conduction. The vertically aligned LLTO structure prepared by an ice-templating method provides fast, continuous and the shortest pathways for Li+ transport, thus boosting the ionic conductivity from 0.038 to 0.13 mS cm−1. As a result, a Li|LiFePO4 full battery assembled with the developed CSE is capable of delivering a specific discharge capacity of 144.6 mAh g−1 at 1 C at 60 °C with a high capacity retention of 96.0% after 100 cycles.

Original languageEnglish
Article number118265
JournalJournal of Membrane Science
Volume610
DOIs
Publication statusPublished - 1 Sep 2020
Externally publishedYes

Keywords

  • Aligned
  • All-solid-state
  • Lithium metal
  • Perovskite
  • Solid electrolyte

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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