对于高度可逆的离子电池,不溶性固体-电解质间相的预制
Minfei Fei1,2,3, Le Qi1,2, Shujuan Han1,2
1School of Sustainable Energy and Resources, Nanjing University, Suzhou, 215163, P. R. China.
Angewandte Chemie (International ed. in English)
|July 25, 2024
概括
研究人员开发了一种稳定离子电池的策略,通过创建不溶性固体电解质介相 (SEI). 这种方法显著提高了循环稳定性和库伦比效率 (CE),用于长期储存能量.
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:
- 稳定的固体电解质介相 (SEI) 形成对于离子电池的可逆性至关重要.
- SEI溶解导致库伦比克效率 (CE) 低,并缩短周期寿命.
- 在SEI组件和它们的溶解性之间的关系还不清楚.
研究的目的:
- 为了建立SEI组件和SEI溶解度之间的直接相关性.
- 量化有机丰富和无机丰富的SEI之间的可溶性差异.
- 为提高电池性能制定一种用于预制富含无机物,不溶性SEI的策略.
主要方法:
- 量化了有机丰富与无机丰富的SEI的可溶性.
- 开发了一种方法来预制一种富含无机物质的SEI.
- 在商业电解质中组装和测试一个硬碳 (HC) 树脂NaMn0.33Fe0.33Ni0.33O2全细胞.
主要成果:
- 发现有机丰富的SEI的溶解度是有机丰富的SEI的3.26倍.
- 预先制定的富含无机物质的SEI战略在900个周期内保持了80.0%的容量.
- 实现了 99.95% 的创纪录的平均 CE,用于实际的离子全电池.
结论:
- 预先形成一种不溶性,富含无机物质的SEI,有效地抑制了SEI的溶解.
- 这一策略显著提高了离子电池的循环稳定性和库伦比效率.
- 这些发现为实现高度可逆和长期的离子储能提供了一条道路.
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