离子双极排斥提高了先进的离子电池中μ-Sn的低温性能
Hongyu Lv1, Qian Yao1, Cheng Zheng1
1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China.
这项研究引入了一种用于离子电池 (SIB) 的新型混合电解质,该电解质可显著提高低温性能. 新的电解质配方提高了SIB在-40°C的循环稳定性和容量保留.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (SIB) 对于大规模储能至关重要,但其低温性能不佳.
- 现有的电解质在广泛的操作温度范围内限制了SIB的功能.
研究的目的:
- 开发一种改进的电解质,以提高SIB的低温性能.
- 调查混合四原 (THF) 和2甲基四原 (MTHF) 电解质对SIB性能的影响.
主要方法:
- 使用THF和MTHF制备混合电解质.
- 研究溶解结构,溶解能量和电解质粘度.
- 混合电解质与锡 (Sn) 微粒, (Bi) 和硬碳阳极在-40°C的电化学测试.
主要成果:
- 混合电解质证明了增强的阴离子双极驱逐和固体阻碍,削弱了阴离子双极的吸引力和减少了溶解能量.
- 由于双极-双极相互作用较弱,观察到电解质粘度降低和离子导电性改善.
- 在 -40°C 1000 个循环后,Sn 微粒达到 328 mAh g−1,显著超过单溶剂电解质.
- 电解质与Bi和硬碳阳极具有良好的兼容性.
结论:
- 混合THF/MTHF电解质显著提高了SIB的低温性能和循环稳定性.
- 这些发现为先进的SIB提供了对低温电解质机制的更深入的了解.
- 这种电解质设计可适应各种阳极材料,突出其广泛的应用.
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