2024-04-16 オークリッジ国立研究所(ORNL)
＜関連情報＞
- https://www.ornl.gov/news/neutrons-rule-roost-cage-free-lithium-ions
- https://www.nature.com/articles/s41563-024-01834-y
リチウム電池用ポリマー電解質におけるナノ秒溶媒和ダイナミクス Nanosecond solvation dynamics in a polymer electrolyte for lithium batteries
Neel J. Shah,Chao Fang,Naresh C. Osti,Eugene Mamontov,Xiaopeng Yu,Jaeyong Lee,Hiroshi Watanabe,Rui Wang & Nitash P. Balsara
Nature Materials Published:27 February 2024
DOI:https://doi.org/10.1038/s41563-024-01834-y
Abstract
Solvation dynamics critically affect charge transport. Spectroscopic experiments and computer simulations show that these dynamics in aqueous systems occur on a picosecond timescale. In the case of organic electrolytes, however, conflicting values ranging from 1 to several 100 picoseconds have been reported. We resolve this conflict by studying mixtures of an organic polymer and a lithium salt. Lithium ions coordinate with multiple polymer chains, resulting in temporary crosslinks. Relaxation of these crosslinks, detected by quasielastic neutron scattering, are directly related to solvation dynamics. Simulations reveal a broad spectrum of relaxation times. The average timescale for solvation dynamics in both experiment and simulation is one nanosecond. We present the direct measurement of ultraslow dynamics of solvation shell break-up in an electrolyte.
