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用于可逆Zn-石墨双离子电池的溶剂衍生化二次介相
Shiwei Tao1, Baris Demir2, Ardeshir Baktash3
1School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture and Information Technology, the University of Queensland, Brisbane, QLD 4072, Australia.
Angewandte Chemie (International ed. in English)
|July 5, 2023
概括
部分化碳酸盐溶剂在双离子电池 (DIB) 中形成了一层保护层,改善了离子间隙和稳定性. 这提高了循环性能,并减少了Zn-石墨DIB中的自放电.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 阳离子间隙-脱不可逆性限制了双离子电池 (DIB) 的循环稳定性.
- 由于溶剂协同插入而导致的石墨脱皮是DIBs的一个关键挑战.
研究的目的:
- 调查使用部分化碳酸盐溶剂来提高DIB性能.
- 了解二次相间形成的机制及其对离子运输的影响.
主要方法:
- 在 Zn-石墨 DIB 中使用了部分化碳酸盐溶剂.
- 分析了化二次相间层的形成.
- 评估了电化学性能,包括循环稳定性,库伦比效率和放电能力.
主要成果:
- 化介相层有效地抑制了溶剂的协同插入和石墨剥落.
- 实现了高库伦比效率 (98.5%在800个循环后) 和容量保留.
- 与传统碳酸盐溶剂相比,显著减少了自放电行为.
结论:
- 部分化碳酸盐溶剂提供了一种简单而有效的策略,以提高DIB循环稳定性.
- 形成的相间层增强了离子可逆性,并抑制了有害的副作用反应.
- 这种方法加速了基于石墨的DIBs的实际应用.
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