Quasi-solid-state lithium batteries using bulk-size transparent Li7La3Zr2O12 electrolytes

Shoichi Sugata, Noriko Saito, Akio Watanabe, Ken Watanabe, Je Deok Kim, Kan Kitagawa, Yosuke Suzuki, Itaru Honma

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2 Citations (Scopus)

Abstract

A thick bulk-sized Li7La3Zr2O12 (LLZ) solid electrolyte is successfully prepared using a polymer complex method and a hot isostatic pressing (HIP) treatment. Despite the difficulties of densification, HIP-treated LLZ can be prepared as a transparent ceramic pellet because of its ~200 μm primary grain size, and its conductivity is improved by its increased density (>99%). An all-solid-state lithium battery is fabricated by using a mixed conducting ionic liquid gel to connect the bulk-sized LLZ electrolyte and a LiFePO4 (LFP) cathode. The introduction of the mixed conducting gel layer reduces the electrode/electrolyte interface resistance. The specific discharge capacity of the active cathode material is 169 mAh g−1 (current density of 0.046 mA cm−2), which suggests that almost the full capacity of LFP can be utilized even under the all-solid-state cell design. The coulombic efficiency (ηc) is ≈1, and no side reactions are observed. The LFP/LLZ/Li cell shows a high electrochemical stability against the Li metal anode, and the cell operates for 20 cycles without dendrite growth causing a short circuit under a charge current density of 0.591 mA cm−2 (1/2 C rate).

Original languageEnglish
Pages (from-to)285-290
Number of pages6
JournalSolid State Ionics
Volume319
DOIs
Publication statusPublished - Jun 2018
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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