通过排放状态的日历老化回收分离的
Wenbo Zhang1, Philaphon Sayavong2, Xin Xiao1
1Department of Materials Science and Engineering, Stanford University, Stanford, CA, USA.
Nature
|February 7, 2024
概括
将可充电的金属电池放在放电状态下可以提高容量保留. 这与充电状态休息形成鲜明对比,它通过一种新的途径使分离的恢复.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 可充电的金属电池比目前的离子电池具有更高的能量密度.
- 金属电池的实际采用受到快速循环降解的阻碍,主要是由于的断开.
- 了解降解和回收机制对于推进电池技术至关重要.
研究的目的:
- 调查日历在放电状态下对金属电池性能的影响.
- 确定休息期间产能变化的机制.
- 探索改善金属电池寿命的新型循环策略.
主要方法:
- 采用混合连续休息循环协议,用于半电池和无阳极电池.
- 使用定位气体染色法来验证非活跃容量回收.
- 使用一个操作光学设置来确认重新激活.
主要成果:
- 在排放状态下日历老化被发现可以改善容量保留.
- 观察到库伦比效率超过100%,表明隔离的回收.
- 操作式光学显微镜证实了孤立的重新激活作为主要的恢复机制.
结论:
- 放电状态休息促进隔离回收,增强容量保留.
- 这一发现与充电状态休息期间观察到的容量降低形成对比.
- 优化循环策略,特别是结合放电状态休息,可以显著提高金属电池的性能.
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