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Effects of Phase Change and Cu Doping on the Li Storage Properties of Rutile TiO2 (Supporting Information)

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posted on 2022-02-10, 08:55 authored by Hiroyuki USUI, Yasuhiro DOMI, Thi Hay NGUYEN, Shin-ichiro IZAKI, Kei NISHIKAWA, Toshiyuki TANAKA, Hiroki SAKAGUCHI
The crystal structure and Li storage properties of Cu-doped rutile TiO2 after a phase change caused by lithiation were investigated for the first time. Structural analysis results confirmed that undoped rutile TiO2 was transformed to a disordered layered rock-salt LixTiO2 structure with a small volume expansion of only 1 % when cycled in a potential range of 1.0–3.0 V vs. Li+/Li. A substitutional solid solution of Cu2+ was formed in layered LixTiO2. The Cu doping increased both the interlayer distance and electronic conductivity of the layered LixTiO2. As an Li-ion battery anode, a Cu-doped TiO2 electrode exhibited a long cycle life, maintaining a reversible capacity of 120 mAh g−1 over 10000 cycles at 5C and an excellent rate capability of 108 mAh g−1 at 50C. Furthermore, this electrode could also be potentially used as a Na storage material. These attractive properties demonstrate high applicability of Cu-doped rutile TiO2 as a novel anode material.

Funding

Impurity-doped rutile TiO2 as novel anode materials for next-generation rechargeable battery

Japan Society for the Promotion of Science

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In-depth understanding of the silicon lithiation process for next-generation lithium secondary batteries

Japan Society for the Promotion of Science

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Creation of next-generation lithium-ion batteries using silicon

Japan Society for the Promotion of Science

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Study of electrodeposition mechanism of Li metal by using a ultra-micro-electrode

Japan Society for the Promotion of Science

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Development of high energy density compact solid-state battery using rutile type titanium oxide negative electrode

Japan Science and Technology Agency

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Corresponding author email address

sakaguch@tottori-u.ac.jp

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© 2022 The Author(s)

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