Low-Resistive LiCoO2/Li1.3Al0.3Ti2(PO4)3 Interface Formation by Low-Temperature Annealing Using Aerosol Deposition

Miyuki Sakakura, Yasuhiro Suzuki, Takayuki Yamamoto, Yuta Yamamoto, Munekazu Motoyama, Yasutoshi Iriyama

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Interfacial resistance at electrode-high Li+ conductive solid electrolytes must be reduced well to develop high-power all-solid-state batteries using oxide-based solid electrolytes (Ox-SSBs). Herein, crystalline electrode films of LiCoO2 (LCO) are formed on a high Li+ conductive crystalline-glass solid electrolyte sheet, Li1.3Al0.3Ti2(PO4)3 (LATP) (σ25 °C = 1 × 10−4 S cm−1), at room temperature by aerosol deposition (AD), and the effects of the annealing temperature on the interfacial resistivities (Rint) at the LCO/LATP are investigated. The Rint visibly increases by annealing over 500 °C with the growth of Co3O4 as a reactant. In contrast, Rint is reduced to ≈100 Ω cm2 by low-temperature annealing at 250–350 °C due to superior contact through the structural rearrangement of an artificial metastable interface formed by the AD. These results are applied to bulk-type Ox-SSB, Li/Li7La3Zr2O12(LLZ)/LCO–LATP, and our best Ox-SSB delivers a discharge capacity of 100 mA cm−2 at 100 °C.

Original languageEnglish
Article number2001059
JournalEnergy Technology
Volume9
Issue number5
DOIs
Publication statusPublished - May 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Energy(all)

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