Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI

doi:10.1088/1674-1056/acca0d

中国物理B ›› 2023, Vol. 32 ›› Issue (7): 76401-076401.doi: 10.1088/1674-1056/acca0d

Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI

Jinbing Zhang(张晋兵)^1,2, Fengping Wang(王凤平)^1,†, Zexian Cao(曹则贤)^2,3, and Qiang Wang(王强)^2,‡

1 School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

收稿日期:2023-03-03 修回日期:2023-04-04 接受日期:2023-04-04 出版日期:2023-06-15 发布日期:2023-06-28
通讯作者: Fengping Wang, Qiang Wang E-mail:fpwang@ustb.edu.cn;qwang@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974385 and 91956101).

Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI

Jinbing Zhang(张晋兵)^1,2, Fengping Wang(王凤平)^1,†, Zexian Cao(曹则贤)^2,3, and Qiang Wang(王强)^2,‡

1 School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Songshan Lake Materials Laboratory, Dongguan 523808, China

Received:2023-03-03 Revised:2023-04-04 Accepted:2023-04-04 Online:2023-06-15 Published:2023-06-28
Contact: Fengping Wang, Qiang Wang E-mail:fpwang@ustb.edu.cn;qwang@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11974385 and 91956101).

摘要/Abstract

摘要： We present findings on the effect of nanometer-sized silica-based pores on the glass transition of aqueous solutions of lithium bis(trifluoromethane)sulfonimide (LiTFSI) and lithium difluorosulfimide (LiFSI), respectively. Our experimental results demonstrate a clear dependence of the confinement effect on the anion type, particularly for water-rich solutions, in which the precipitation of crystalized ice under cooling process induces the formation of freeze-concentrated phase confined between pore wall and core ice. As this liquid layer becomes thinner, the freeze-concentrated phase experiences glass transition at increasingly higher temperatures in solutions of LiTFSI. However, differently, for solutions of LiFSI and LiCl, this secondary confinement has a negligible effect on the glass transition of solutions confined wherein. These different behaviors emphasize the obvious difference in the dynamic properties' response of LiTFSI and LiFSI solutions to spatial confinement and particularly to the presence of the hydrophilic pore wall.

关键词: anion type-dependent confinement effect, glass transition, Li salts, aqueous solutions

Abstract: We present findings on the effect of nanometer-sized silica-based pores on the glass transition of aqueous solutions of lithium bis(trifluoromethane)sulfonimide (LiTFSI) and lithium difluorosulfimide (LiFSI), respectively. Our experimental results demonstrate a clear dependence of the confinement effect on the anion type, particularly for water-rich solutions, in which the precipitation of crystalized ice under cooling process induces the formation of freeze-concentrated phase confined between pore wall and core ice. As this liquid layer becomes thinner, the freeze-concentrated phase experiences glass transition at increasingly higher temperatures in solutions of LiTFSI. However, differently, for solutions of LiFSI and LiCl, this secondary confinement has a negligible effect on the glass transition of solutions confined wherein. These different behaviors emphasize the obvious difference in the dynamic properties' response of LiTFSI and LiFSI solutions to spatial confinement and particularly to the presence of the hydrophilic pore wall.

Key words: anion type-dependent confinement effect, glass transition, Li salts, aqueous solutions

中图分类号: (Glass transitions of specific systems)

64.70.P-

61.43.Gt (Powders, porous materials) 68.15.+e (Liquid thin films) 78.55.Qr (Amorphous materials; glasses and other disordered solids)

Jinbing Zhang(张晋兵), Fengping Wang(王凤平), Zexian Cao(曹则贤), and Qiang Wang(王强). Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI[J]. 中国物理B, 2023, 32(7): 76401-076401.

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Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI

Anion type-dependent confinement effect on glass transitions of solutions of LiTFSI and LiFSI

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