在离子电池中,对长期零伏存储在37°C的工作阳极的潜在调节
Hanchen Wang1, Yingtian Liu1, Mingze Jiang1
1National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China.
Advanced materials (Deerfield Beach, Fla.)
|March 22, 2024
概括
由于Li6CoO4添加剂,先进的离子电池现在可以容忍零电压存储 (ZVS). 这项创新显著改善了容量保留,并防止了医疗设备和航天器至关重要的退化.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 先进的离子电池需要对零电压存储 (ZVS) 的耐受性,用于诸如植入式医疗设备和航天器等应用.
- 零电压储存 (ZVS) 可以导致阳极电位增加,导致铜 (Cu) 电流收集器溶解和固体电解质介相 (SEI) 降解,特别是在37°C.
研究的目的:
- 在ZVS期间在滥用放电条件下展示可控制的阳极潜力.
- 为了研究Li6CoO4阴极添加剂在37°C的ZVS期间对电池性能的影响.
主要方法:
- 在LiCoO2中对Li6CoO4阴极添加剂剂量进行定量调节.
- 在37°C时监测零交叉潜力 (ZCP) 和ZVS潜力.
- 在ZVS期间后评估容量保留比率 (CRR),Cu溶解和SEI退化.
主要成果:
- 添加Li6CoO4使得ZCP和ZVS电位在37°C下保持在2.0V以下 (相对于Li/Li+).
- 在ZVS的10天和20天后,容量保留比率 (CRR) 从69.1%和35.9%提高到98.6%和90.8%.
- 有效抑制Cu溶解和SEI降解,过度化阴极显示ZVS后的高可逆容量.
结论:
- 使用Li6CoO4添加剂进行定量潜力调节是克服ZVS限制的关键.
- 溶解,SEI降解和阴极转换被确定为长期ZVS的限制因素.
- 设计了37°C的ZVS保护的潜在范围,通过精确的潜在调节实现了创纪录的CRR.
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