直接再生的消耗液态COO2与梯度F-杂的表面下面向超稳定的存储性能
Hai Lei1,2, Xinwei Cui2, Zihao Zeng1
1School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.
Angewandte Chemie (International ed. in English)
|September 19, 2024
概括
通过兴奋剂直接再生消耗的氧化 (LCO),可以增强其能量储存. 这种方法可以提高离子的活性和稳定性,从而实现可持续的电池回收.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 可持续化学 可持续化学
背景情况:
- 使用过的氧化物 (LCO) 的直接再生是可持续性的有希望的回收策略.
- 在LCO再生过程中,素等杂质可以从结合剂和电解质中留下来.
- 兴奋剂可能会增强再生LCO的储能能力.
研究的目的:
- 通过量身定制的元素引入来研究耗尽的LCO的物理化学演变.
- 优化含量,以提高再生LCO中的储能性能.
- 了解兴奋剂增强电化学性能的机制.
主要方法:
- 量身定制的引入元素到废弃的LCO材料.
- 使用先进的分析技术,对物理化学进化的表征.
- 电化学测试,以评估用添加剂再生LCO的性能,包括容量和保持高速率.
主要成果:
- 由于氧气空缺,元素的扩散能障碍从1.73 eV降至0.61 eV.
- 形成一个梯度F-doped地下表面和刚硬的CoO5F结构.
- 优化含量 (1重量%) 导致容量为154.4 mAh/g在5.0 C和88.3%的保留在3.0-4.5 V之间.
- 增强了Co-ion的氧化还原活性,并减轻了不可逆转的氧气释放.
结论:
- 量身定制的兴奋剂有效地再生了消耗的LCO,提高了其高压性能.
- 这项研究揭示了在再生的LCO中加入的结构和电化学益处.
- 这项工作提供了开发高性能再生LCO的实用策略,用于先进的储能应用.
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