リチャージ可能なLi-S電池のインターフェイス化学を改善するための同位体オルガノディチオール添加物
Jing Lian1, Wei Guo1, Yongzhu Fu1
1College of Chemistry, Zhengzhou University, Zhengzhou 450001, P. R. China.
Journal of the American Chemical Society
|July 15, 2021
まとめ
ベンゼネディチオール,特に1,4-BDTは,ポリ硫化物シャトルを阻害し,リチウムアノドを安定させることで,リチウム硫化物 (Li-S) バッテリーの性能を向上させます. この新しい電解質添加物は,Li-S細胞のサイクル安定性と容量保持を改善します.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- リチウム硫黄 (Li-S) バッテリーは理論上高いエネルギー密度を提供しているが,ポリ硫化物シャトルと不安定なリチウムアノドインターフェイスに苦しんでいる.
- 現在の研究は,これらの性能制限を緩和するために電解質添加物に焦点を当てています.
研究 の 目的:
- ベンゼネディチオール (BDTs) を新しい電解質添加物としてLi-Sバッテリーに調査する.
- 異なるBDT同位体,特に1,4-BDTのバッテリー性能改善の有効性を評価する.
主な方法:
- ベンゼンデチオールイソメアの合成と特徴付け.
- BDT添加物によるLi-S細胞とLi/Li対称細胞の電気化学試験
- 1,4-BDTによる化学相互作用と構造変化の分析
主要な成果:
- 1,4-BDTは他の同位体と比較して優れた性能を示し,硫黄のオリゴメリゼーションを通じてシャトル効果を効果的に抑制しました.
- リチウムアノドに安定した固体電解質インターフェーズ (SEI) の形成が観察され,低超電位で安定したサイクルを可能にしました.
- 1,4-BDTを使用したLi-S電池は,サイクル安定性,高初期容量 (1548. 5 mAh g−1) と優れた可逆容量 (200サイクル後に1306. 9 mAh g−1) を示した.
- Li- Sポーチ・セルは,C/10の速度で26サイクル後に84. 2%の容量保持を示した.
結論:
- 1,4-BDTで示されるオルガノディチオール化合物は,高度なLi-S電池のための効果的な機能的電解質添加物です.
- 1,4-BDTは,Li-S電池技術の重要な課題を克服するための有望な戦略を提供し,より優れたエネルギー貯蔵ソリューションの道を開きます.
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