DataVXACS Applied Materials & InterfacesPaper
journal article·2021-07-28

Suppression Mechanisms of the Solid-Electrolyte Interface Formation at the Triple-Phase Interfaces in Thin-Film Li-Ion Batteries

Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Osami Sakata, Takuya Hoshina, Takaaki Tsurumi, Yutaka Majima, Mitsuru Itoh

ACS Applied Materials & Interfaces· Volume 13· Issue 29
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Source abstract

Abstract

Side reactions of the charge/discharge in Li-ion batteries (LIBs) generate a solid-electrolyte interface (SEI) onto an electrode surface, resulting in the degradation of the lifetime of a cell. The suppression of SEI formations has attracted much attention for achieving longer cyclable LIBs. Our research group has previously reported that few SEI were observed at triple-phase interfaces (TPIs) consisting of BaTiO3, LiCoO2, and electrolyte interfaces in LIBs with excellent cyclability and ultrahigh-speed chargeability. An investigation on the suppression mechanisms of SEI formations at TPIs should yield important information on understanding the undesirable side reactions. Therefore, we have explored the suppression mechanisms of SEI formations by preparing epitaxial thin films and evaluating the surface of the samples after the electrochemical treatment. The results of X-ray photoelectron spectroscopy and scanning electron microscopy with energy-dispersive X-ray analysis measurements suggested that the decomposition of LiPF6 was suppressed at TPIs, implying that the generation of PF5 via the decomposition of LiPF6 contributed to SEI formation.
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Research context

Energy storage

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Laboratory for Materials and Structures, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan

School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Laboratory for Advanced Nuclear Energy, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan

Graduate School of Natural Science and Technology, Okayama University, 1-1-1, Tsushimanaka, Kita-ku, Okayama-shi, Okayama 700-8530, Japan

Synchrotron X-ray Station at SPring-8 and Synchrotron X-ray Group, National Institute for Materials Science (NIMS), 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan

Funding

Ministry of Education, Culture, Sports, Science and Technology · Ministry of Education · Murata Science Foundation · National Research Foundation of Korea · Japan Society for the Promotion of Science · Laboratory for Materials and Structures, Tokyo Institute of Technology

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