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12 December 2024 Achieving low-temperature fast charging with PC-based electrolytes: regulating solvation structure, diffusion coefficient, and conductivity by concentration
Hang Su, Sihang Chen, Hui Zeng, Zhan Li, Longlong Zhang, Yining Wu, Hao Ren
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Proceedings Volume 13419, Tenth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2024); 134192I (2024) https://doi.org/10.1117/12.3050202
Event: Tenth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2024), 2024, Lhasa, China
Abstract
Propylene carbonate (PC)-based electrolytes offer significant advantages for low-temperature discharge, but their performance at extreme ion concentrations is not yet well understood. This study explores the molecular-level differences in solvation shell structures of PC and ethylene carbonate (EMC) mixed electrolytes at extreme LiPF6 concentrations under low-temperature conditions (253.15K), and analyzes the transport properties of diffusion coefficients and electrolyte conductivity. The study finds that with increasing LiPF6 concentration, the number of PC molecules in the solvation shell decreases, while the number of PF6̅ ions increases, leading to a rise in conductivity. When the LiPF6 concentration exceeds 1M, the increment of PF6̅ involved in the solvation structure diminishes, and the rate of increase in conductivity gradually slows down. This indicates that at high concentrations, more PF6̅ ions participate in the formation of solvation structures, which contributes to the enhancement of conductivity. This research provides a design basis for the application of PC-based electrolytes in low-temperature fast-charging batteries.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Hang Su, Sihang Chen, Hui Zeng, Zhan Li, Longlong Zhang, Yining Wu, and Hao Ren "Achieving low-temperature fast charging with PC-based electrolytes: regulating solvation structure, diffusion coefficient, and conductivity by concentration", Proc. SPIE 13419, Tenth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2024), 134192I (12 December 2024); https://doi.org/10.1117/12.3050202
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KEYWORDS
Electrolytes
Electrical conductivity
Diffusion
Lithium
Carbonates
Batteries
Molecules
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