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Updated: May 16, 2026
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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
Published on: July 12, 2016
非水性Li-O2細胞の炭素電極は,水性でないLi-O2細胞の炭素電極である
Muhammed M Ottakam Thotiyl1, Stefan A Freunberger, Zhangquan Peng
1School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom.
Journal of the American Chemical Society
|November 30, 2012
まとめ
リチウム酸素電池のカーボンカドードは3.5V以上では不安定で,炭酸リチウムに分解し,電解質の分解を促進します. 排水性炭素はより高い安定性を示しているが,電解質の相互作用は,実用的な応用には依然として課題となっている.
科学分野:
- 電気化学 電気化学について
- マテリアルサイエンス 材料科学
- エネルギー貯蔵 エネルギー貯蔵
背景:
- 炭素材料は,非水性リチウム-酸素 (Li-O(2) 細胞の多孔性カトドとして広く使用されています.
- 炭酸カトドの安定性と,電解質分解への影響は,バッテリーの性能にとって非常に重要です.
- 炭素の表面特性 (水性/水友性) は,細胞の行動に影響する.
研究 の 目的:
- サイクル中のLi-O(2) 細胞における炭素カトドの安定性を調査する.
- 炭素と電解質の分解のメカニズムを理解する.
- 細胞の性能における炭素表面特性の役割を評価する.
主な方法:
- Li-O(2) セルで2~4Vのサイクルを繰り返した炭素カソッドの分析.
- 表面分析のための酸処理とフェントンの反応剤の使用.
- 微分電気化学質量スペクトロメトリー (DEMS) とフーリエ変換赤外線スペクトロメトリー (FTIR).
主要な成果:
- 炭素カトドは3.5V以下では安定しているが,3.5V以上で充電するとLi(2) CO(3) に分解する.
- 炭素は電解質の分解を促進し,Li(2) CO(3) とLiの炭酸塩を形成し,極化を引き起こす.
- 水性炭酸は,水性炭酸よりも安定性が低く,電解質を分解する際に触媒的により活発である.
結論:
- Li-O(2) 細胞における炭素カソッドの安定性は,3.5V以上の酸化分解と電解質の相互作用によって制限されます.
- Li(2) CO(3) とLi炭酸塩の蓄積は,容量の衰退と電極の受動化を引き起こします.
- 有効なLi-O(2) バッテリーサイクルには,電極と電解質の安定性を考慮したシナジスティックなアプローチが必要です.
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