可循环使用的微型基离子电池在-40°C时通过温度依赖的溶解调节实现
Jiacheng Yang1,2, Sicong Wang1,2, Shuangyu Song3
1State Key Laboratory of Bioinspired Interfacial Materials Science, Bioinspired Science Innovation Center, Hangzhou International Innovation Institute, Beihang University, Hangzhou, 311115, China.
Advanced materials (Deerfield Beach, Fla.)
|May 15, 2025
概括
研究人员开发了一种用于离子电池 (LIB) 中微米尺寸 (μSi) 阳极的新型电解质,可在极低的温度下保持稳定的性能,低至-40°C.
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:
- 微米大小的 (μSi) 阳极为离子电池 (LIB) 提供高能量密度.
- 微Si阳极低于-20°C的低温循环能力不足,是由于固体电解质间相 (SEI) 降解而面临的主要挑战.
- 开发适用于寒冷环境的稳定LIB对于扩大其应用至关重要.
研究的目的:
- 为了提高LIBs中的μSi阳极的低温性能和循环性.
- 研究电解质成分在低于零度温度下稳定SEI中的作用.
- 为了在极寒条件下使用μSi阳极.
主要方法:
- 使用了一种新型的电解质,其中包括甲基二乙酸 (MDFA) 和乙烯碳酸 (FEC),具有适应温度的离子双极相互作用.
- 分析了Li+离子的溶解结构和低温下SEI层的形成.
- 在-40°C测试了μSi阳极和全电池的电化学性能.
主要成果:
- 在零度以下的温度下,MDFA/FEC电解质促进了接触离子对主导的溶解结构.
- 这促进了Li+溶解和形成一个薄而坚固的,富含无机物质的SEI.
- 在 -40 °C (0.1 A g-1) 的100个循环后,μSi阳极实现了786 mAh g-1的记录容量,具有稳定的全电池性能.
结论:
- 开发的电解质显著提高了μSi阳极的低温循环能力.
- 这一突破使得高能LIB在极寒环境中的应用成为可能.
- 这些发现为适用于寒冷气候的强大的储能解决方案铺平了道路.
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