薄膜リチウム電池材料の基礎研究 Basic research for thin

桑田
助教
直明
Naoaki KUWATA
Assistant Professor
東北大学多元物質科学研究所
Institute of Multidisciplinary Research for Advanced Materials Tohoku University
サステナブル理工学研究センター
Research Center for Sustainable Science & Engineering
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固体イオニクス
薄膜リチウム電池
イオン伝導性ガラス
その場測定
Solid state ionics
Thin-film lithium battery
Ion conductor glasses
In situ measurements
薄膜リチウム電池材料の基礎研究
Basic research for thin-film lithium battery materials
従来の二次電池を超える次世代二次電池の実現が期待されています。薄膜リチウム電池は固体電解質を用いた全固体電池の
一つです。固体電解質は有機電解液よりも高い安定性を持つために、より高い電圧をもつ 5 V 以上の二次電池が実現できま
す。また、副反応が抑えられ、きわめて寿命が長いことから関心が高まっています。
Realization of next generation secondary batteries has been expected to overcome the conventional lithium-ion batteries. Thin-film lithium
batteries are one of the all-solid-state battery using a solid electrolyte. The solid electrolyte has a higher stability than the organic liquid
electrolyte. It is possible to realize high-voltage secondary batteries with the operating voltage of 5 V. In addition, solid-state batteries
shows extremely long life due to the less side reactions.
真空中での薄膜作製（パルスレーザー堆積）法を用いて様々な正極・固体電解質・負極薄膜を作製しています。酸化物ガラ
ス薄膜は、イオン伝導性・電位窓・安定性に優れており、固体電解質として期待されています。また、全固体電池内部で起
こる拡散や相転移現象を基礎から明らかにするため、in situ ラマン測定などのその場解析手法を適用しています。
We have prepared a variety of positive electrode, solid electrolyte and negative electrode thin films in vacuum using pulsed laser deposition.
Oxide glass thin films have advantages in the ionic conductivity, potential window and stability as a solid electrolyte. In addition, in order
to clarify the diffusion and phase transition properties in the all-solid-state batteries, we have applied in situ techniques such as in situ
Raman spectroscopy.
Solid-state thinfilm battery
Fig.1. Upper: Schematic of solid-state
thin-film
batteries
with
5-V-class
materials. Bottom: cyclic voltammogram
of the thin-film battery.
Fig.2. In situ Raman spectroscopy of thinfilm battery with Li/Li3PO4/ LiCoO2. The
reversible change of the LixCoO2 structure
was observed.
Fig.3. System of the pulsed laser
deposition for thin film lithium battery
fabrication.
『全固体リチウムイオン二次電池の開発と製造技術』第 6 章, 桑田直明, サイエンス＆テクノロジー, (2012) p. 191-205.
N. Kuwata et al., Solid State Ionics, 262 (2014) 165. N. Kuwata et al., J. Electrochem. Soc., 157 (2010), A521. N. Kuwata et al., Electrochem. Commun., 6 (2004) 417.
[email protected]
http:// www.tagen.tohoku.ac.jp/labo/kawamura/index_j.html

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