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非对称溶剂调节结晶限制电解质,用于全气候金属电池

Yuankun Wang¹, Zhiming Li¹, Weiwei Xie¹

¹Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, 300071, Tianjin, China.

Angewandte Chemie (International ed. in English)

|December 15, 2023

概括

使用乙烯硫酸盐和乙烯碳酸盐混合物的新结晶限制策略使离子电池在广泛的温度范围内稳定运行,从-50°C到70°C.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学

背景情况:

可充电电池需要稳定的液体电解质,以在广泛的温度范围内进行离子传输.
高点极性溶剂虽然在高温下是安全的,但在低温下经常结晶,阻碍了电池的性能.

研究的目的:

开发一种策略,以防止电解质在低温下在离子电池中结晶.
为了提高离子电池的耐温性和循环稳定性.

主要方法:

研究了乙烯硫酸盐 (ES) 和乙烯碳酸盐 (FEC) 的电解质混合物,以克服结晶问题.
使用特定的ES/FEC比率 (10%FEC) 来平衡离子运输特性.
在各种温度条件下测试了LiNi0.8Mn0.1Co0.1O2的Lithium (NCM811所谓的RadiusLi) 完整电池和袋电池.

主要成果:

由于分子间相互作用的减少,ES/FEC电解质混合物在低温下显示抑制结晶.
完整的NCM811 RADISHABLE Li电池实现了极好的耐热性和在-50°C至+70°C的循环稳定性.
在相对于室温的-50°C时,观察到超过66%的容量保留,在现实条件下稳定循环.

结论:

使用ES/FEC混合物的结晶限制策略有效地提高了离子电池的低温性能.
开发的电解质使电池在极端温度环境中能够稳定可靠地运行.
这种方法为温度范围广泛的可充电电池提供了有希望的解决方案.

关键词:

所有气候的电解质电解质不对称的溶剂不对称的溶剂结点结点结点结点金属电池金属电池

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