2022 Fiscal Year Final Research Report
Investigation of Electrode Behavior of Layered Oxide Cathode Single Crystals and its Development into Single Crystal Lithium Ion Batteries
| Project/Area Number |
21K18906
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 30:Applied physics and engineering and related fields
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| Research Institution | University of Yamanashi |
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Principal Investigator |
Tanaka Isao 山梨大学, 大学院総合研究部, 教授 (40155114)
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| Co-Investigator(Kenkyū-buntansha) |
金村 聖志 東京都立大学, 都市環境科学研究科, 教授 (30169552)
丸山 祐樹 山梨大学, 大学院総合研究部, 助教 (10782469)
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| Project Period (FY) |
2021-07-09 – 2023-03-31
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| Keywords | 層状酸化物 / 単結晶リチウムイオン電池 / LiCoO2単結晶 / 電極現象 / 元素置換 / 異方性 |
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| Outline of Final Research Achievements |
This research clarified the anisotropic electrical properties of lithium cobaltate LiCoO2 with a layered structure and fabricated a prototype lithium-ion battery using LiCoO2 single crystals. We found that Mg-substitution improves the ionic conductivity 1E-5 S/cm along the a-axis of LiCoO2 single crystals by approximately 18 times compared to that of undoped LiCoO2. Furthermore, a coin cell using a thick Zr-substituted LiCoO2 single crystal with a thickness of about 300 μm as a cathode was confirmed to be charge-dischargeable and to function as a battery.
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| Free Research Field |
結晶工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、Mg置換によってLiCoO2単結晶のa軸方向のイオン伝導度が約18倍も上昇すること、および、Zr置換LiCoO2単結晶において300μmの厚さでも充放電特性を確認できた。このことは、LiCoO2の大きな異方的イオン伝導性や配向性がリチウムイオン電池の特性・性能向上に大きく影響を与えることを示唆している。そして、LiCoO2単結晶の特長を活かすことで、長寿命で高速充電可能な次世代全固体電池の開発に繋がることが期待できる。
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