Determination of Solid-State Li Diffusion Coefficient of Lithium Insertion Materials from Rate Capability Tests on Diluted Electrode

• ARIYOSHI Kingo

  Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University

• SUGAWA Jun

  Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University

抄録

To establish the kinetics of the lithium insertion materials used as the electrodes in lithium-ion batteries, it is important to clarify the diffusion phenomena of lithium ions in the solid phase. Since there are two variations of the rate-determining step of a lithium insertion electrode (Li-ion diffusion in solid particles and that in the electrolyte solution), these have to be differentiated in any investigation of the diffusion phenomena of Li ions in a solid. In this study, we calculated the rate capability of diluted electrodes using a charge–discharge simulation program and proved that the transport of Li ions in the solid phase is the rate-determining step for a diluted electrode with an extremely low active material content. In addition, the solid-state Li-ion diffusion coefficient can be calculated by analyzing the results of the rate capability tests. These results reveal that the diluted electrode method is very useful for elucidating the solid-state Li ion diffusion phenomena of lithium insertion materials. As such, the rate capability tests provide a new means of analyzing the solid-state diffusion coefficient.

収録刊行物

• Electrochemistry

  Electrochemistry 89 (2), 157-161, 2021-03-05

  公益社団法人　電気化学会

キーワード

• Lithium Insertion Material
• Solid-state Diffusion
• Rate Capability
• Simulation

詳細情報

• CRID: 1390850247496413440
• NII論文ID: 130007995030
• DOI: 10.5796/electrochemistry.20-00136
• ISSN: 21862451
• ISSN: 13443542
• Web Site: https://www.jstage.jst.go.jp/article/electrochemistry/89/2/89_20-00136/_pdf
• 本文言語コード: en
• データソース種別:
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• 抄録ライセンスフラグ: 使用可