通过消除剩余的氧度量来恢复高电压氧度减氧活性
Youngsin Kim1, Hyuk-Joon Kim1, Dae Soo Jung2
1Seoul National University, Department of Materials Science and Engineering, and Institute for Rechargeable Battery Innovations, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea.
Journal of the American Chemical Society
|October 15, 2025
概括
层状氧化物中的氧氧还原不可逆性是由持久氧二极体引起的. 我们表明,在高温下促进电子转移可以消除这些二极体,恢复高压氧氧还原活性.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 氧化氧化氧化物具有高能量密度,但具有电化学不可逆转性.
- 循环过程中的复杂结构和氧化还原变化掩盖了这种不可逆转性的起源.
研究的目的:
- 阐明氧氧化解氧不可逆性的根本原因.
- 为了证明高压氧氧还原平原的可逆恢复.
- 确定减轻不可逆性和提高电极性能的策略.
主要方法:
- 在电化学循环过程中深入追踪氧二聚体的形成和演变.
- 氧二元度与高压平原可恢复性之间的相关性分析.
- 研究温度升高和氧化还原混合对二聚体解离动学的影响.
主要成果:
- 氧氧还原不可逆性是由氧二聚体状态的形成和持久性决定的.
- 剩余氧二极管与高压平原损失之间存在直接相关性 (∼4.5V与Li/Li+).
- 缓慢的二元解离动力被确定为不可逆转的活性损失的根本原因.
- 在中等温度下通过氧化还原混合促进电子转移,完全恢复高压氧化还原活性.
结论:
- 氧二聚体动力学在氧-氧化氧化氧的电化学不可逆性中起着关键作用.
- 消除动态捕获的氧二极体是实现可逆高压氧氧还原活性的关键.
- 这些发现为开发无电压歇斯底里离子氧化还原电极提供了途径.
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