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一个双向离子运动调节器,抑制先进的硫电池中的树突
Jun Jiang1, Yanwen Ding1, Shujun Liu1
1Key Laboratory for Soft Chemistry and Functional Materials of Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Angewandte Chemie (International ed. in English)
|June 3, 2025
概括
这项研究引入了一种液体有机电解质的新型调节剂,通过防止树突形成和抑制穿效应来提高硫电池的安全性,以获得稳定,持久的性能.
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
- 电池技术 电池技术
背景情况:
- 液态有机电解质 (LOE) 对于二次电池沉积至关重要.
- 硫电池 (LSB) 面临着像状岩石形成和穿效应这样的挑战.
研究的目的:
- 为LSBs提出和验证一种新的双向离子运动调节器概念.
- 为了证明离子和阴离子迁移的同时调节,用于无树的电池.
主要方法:
- 应用桑德的时间公式来设计离子运动调节器.
- 形成八面体复合体与TFSI-以控制离子迁移.
- 评估Li+溶解,扩散和硫还原动力学.
主要成果:
- 调节器将树突形成时间延长了25倍以上.
- 通过溶剂分子的吸引力和改进的硫还原动力学来实现穿效应的抑制.
- 在Li,Li-Cu和Li-S细胞中观察到异常的循环稳定性,包括一个Ah级Li-S囊细胞,其容量衰变微不足道.
结论:
- 对于高安全的LSB来说,同时调节阳离子和离子是至关重要的.
- 双向离子动力调节器有效地促进了无石电池的实现,并抑制了穿效应.
- 这种方法显著提高了LSB的自行车稳定性和安全性.
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