Enhancing performance of all-solid-state battery by establishment of interconnected Li7La3Zr2O12 network in graphite composite anode

Jimin Oh, Dong Ok Shin, Myeong Ju Lee, Yong Min Lee, Young Gi Lee, Seungbum Hong, Kwang Man Kim

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Garnet-type Li7La3Zr2O12 (LLZO) solid electrolytes are synthesized with interconnected and larger rounded particle morphologies using a cellulose template method and conventional solid-state reaction, respectively. The synthesized LLZOs are optimized and used as a solid electrolyte in a natural graphite (NG)-based composite anode in an all-solid-state lithium battery. For the LLZO with the interconnected particle morphology, the optimum heat-treatment temperature (900 °C) and LLZO content (30 wt%) are determined to result in higher ionic conductivity. That is, higher dispersion or good distribution of the interconnected LLZO (width of 1 μm or less) within the composite anode enables easier ionic conduction of the interconnected LLZO. The NG-based composite anode filled with interconnected LLZO shows effective improvement due to a well-controlled inner percolation structure, resulting in improved cycle stability and enhanced high-rate capability, compared with the composite anode embedded with conventional spherical-type LLZO particles.

Original languageEnglish
Article number107761
JournalJournal of Energy Storage
Volume68
DOIs
StatePublished - 15 Sep 2023

Keywords

  • All-solid-state battery
  • Charging rate
  • Cycling stability
  • Graphite anode
  • Ionic conductivity
  • LiLaZrO

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