溶剂链长度工程使所有气候离子电池成为可能
Zongbin Luo1, Linyu Hu2, Chunlong Dai1
1College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan, 610065, China.
Angewandte Chemie (International ed. in English)
|September 13, 2025
概括
研究人员通过调整溶剂链长度,为离子电池 (SIB) 设计了一种混合溶剂电解质. 这一策略可以提高电池在各种温度和循环持续时间的性能.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 由于溶剂的限制,离子电池 (SIB) 在实现高速率能力,循环稳定性,高压耐受性和广泛温度适应性方面面临挑战.
- 当前的电解质设计往往涉及这些关键性能指标之间的权衡.
研究的目的:
- 通过工程化溶剂链长度,为SIBs开发一个分子级电解质设计策略.
- 解决SIB电解质的多目标优化挑战,重点关注动力学,热力学和界面稳定性.
主要方法:
- 通过结合短链乙烯,长链甘乙烯,1,3-二氧化 (DOL) 和乙烯碳酸盐 (FEC) 来构建混合溶剂电解质.
- 研究了溶剂-溶剂相互作用以调节Na+溶解和离子运输.
- 利用FEC来诱导富含离子的协调,以提高接口稳定性.
主要成果:
- 混合电解质使Na3V2 ((PO4) 3) 能在9500个循环后在10°C下达到82.75 mAh g-1,并保持1°C运行600天.
- 经过一年多的稳定和对称细胞循环.
- 在广泛的温度范围 (-40~60°C) 和电压窗口 (2.0~4.5V) 中实现了稳定的电池运行.
结论:
- 溶剂链长度工程是优化SIB电解质性能的一个可行的策略.
- 开发的混合电解质为实现具有平衡多性能指标的全气候SIB提供了切实可行的途径.
- 这种方法成功地解决了SIB中的动力学,热力学和接口挑战.
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