Effects of sintering temperature on interfacial structure and interfacial resistance for all-solid-state rechargeable lithium batteries

Takehisa Kato, Ryuji Yoshida, Kazuo Yamamoto, Tsukasa Hirayama, Munekazu Motoyama, William C. West, Yasutoshi Iriyama

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Sintering processes yield a mutual diffusion region at the electrode/solid electrolyte interface, which is considered as a crucial problem for developing large-sized all-solid-state rechargeable lithium batteries with high power density. This work focuses on the interface between LiNi1/3Co1/3Mn1/3O2 (NMC) and NASICON-structured Li+ conductive glass ceramics solid electrolyte (Li2[Formula presented]2O3[Formula presented]2[Formula presented]2O5[Formula presented]2[Formula presented]2: LATP sheet (AG-01)), and investigates the effects of sintering temperature on interfacial structure and interfacial resistance at the NMC/LATP sheet. Thin films of NMC were fabricated on the LATP sheets at 700 °C or 900 °C as a model system. We found that the thickness of the mutual diffusion region was almost the same, ca. 30 nm, in these two samples, but the NMC film prepared at 900 °C had three orders of magnitude larger interfacial resistance than the NMC film prepared at 700 °C. Around the interface between the NMC film prepared at 900 °C and the LATP sheet, Co in the NMC accumulates as a reduced valence and lithium-free impurity crystalline phase will be also formed. These two problems must contribute to drastic increasing of interfacial resistance. Formation of de-lithiated NMC around the interface and its thermal instability at higher temperature may be considerable reason to induce these problems.

Original languageEnglish
Pages (from-to)584-590
Number of pages7
JournalJournal of Power Sources
Volume325
DOIs
Publication statusPublished - Sep 1 2016
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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