在前离子离子液中TiNb2O7的电化学质子化/解质子化
Masahiro Shimizu1, Takuya Kawai1, Tomonori Ichikawa1
1Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano, 380-8553, Japan. shimizu@shinshu-u.ac.jp.
Physical chemistry chemical physics : PCCP
|February 21, 2025
概括
基于质子的可充电电池看起来很有希望,但酸性电解质会导致问题. 这项研究使用了离子液体来实现TiNb2O7的稳定质子化,HTFSA/DBU系统显示超过90%的库伦效率,没有容量衰减.
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:
- 由于Grotthuss机制,对质子/离子可充电电池的兴趣日益增长.
- 酸性水性电解质的挑战包括诸如进化和材料溶解之类的副作用.
- 需要稳定的电解质和活性材料用于实际的以质子为基础的电池.
研究的目的:
- 为了证明TiNb2O7的电化学质子化,使用前离子离子液 (PIL) 作为电解质.
- 为了研究不同布伦斯特德酸/组合在质子电池的PIL中的性能.
- 为了克服质子可充电电池中的水性酸性电解质的局限性.
主要方法:
- 使用的乙酸 (AcOH) 和1,1,1-三-N-((三甲基) 硫) 甲硫胺 (HTFSA) 作为布伦斯特德酸.
- 在PILs中使用1-甲基胺醇 (Im) 和1,8-二甲环[5.4.0]-7-无 (DBU) 作为布伦斯特德基.
- 使用TiNb2O7作为活性材料测试电池性能,评估容量,库伦效率和循环稳定性.
主要成果:
- 水性缓冲溶液显示出主导的不可逆转的进化.
- AcOH/DBU系统的容量可以忽略不计;AcOH/Im和HTFSA/Im显示初始容量但库伦效率低 (<20%).
- 该HTFSA/DBU系统实现了40mAhg-1 (H0.5TiNb2O7) 的可逆容量,高于90%的库伦效率,在50个周期内保持96%的降解率.
结论:
- 蛋白离子液,特别是HTFSA/DBU系统,使TiNb2O7.7的稳定和高效的电化学质子化成为可能.
- 这种方法有效地减轻了与水性酸性电解质相关的问题,例如进化.
- 该HTFSA/DBU系统显示出开发高性能,持久性质子可充电电池的巨大潜力.
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