¹³C/⁷Li Solid-State Nuclear Magnetic Resonance Study on Poly(Ethylene Glycol)-Poly(Propylene Glycol)-Poly(Ethylene Glycol)/LiCF₃SO₃ Copolymer Electrolytes

Abstract:

Solid-state high-resolution ¹³C/⁷Li nuclear magnetic resonance (NMR) study was performed on the phase structure and chain dynamics of PEG-PPG-PEGn/LiCF₃SO₃ (n=3, 6, 12) copolymer electrolytes. PEG repeating units and Li⁺ form PEG₃:LiCF₃SO₃ crystalline complex and PE₃/Li⁺ amorphous complex in all the samples. PPG repeating units and Li⁺ form different complexes with respect to O:Li⁺ feed ratio (denoted as PP/Li⁺-3/6/12). The ¹³C chemical shifts and half widths of the signals from PP/Li⁺-3/6/12 remain unchanged, which implies the structures of PP/Li⁺-3/6/12 are similar at least in a very short range. The half width of the ⁷Li signals from PP/Li⁺-3/6/12 becomes narrower and narrower as the Li⁺ concentration decreases. This indicates the chain mobility of the amorphous phase increases with the decrease of ionic concentration. Moreover, neat crystalline PEG, neat amorphous PEG and neat amorphous PPG start to appear when O:Li⁺ is greater than 3:1 and their contents increase with the increase of O:Li⁺. Overall, solid-state high-resolution NMR is a powerful and unique method for understanding the phase structure and chain dynamics of solid polymer electrolytes (SPEs), more applications of this technique to studies on SPEs is expecting.

• Periodical: Materials Science Forum (Volume 982)
• Pages: 26-33
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.982.26
• Online since: March 2020
• Authors: Ling Wei*, Da Wei Li
• Keywords: Lithium-Ion Batteries, Solid Polymer Electrolytes, Solid-State Nuclear Magnetic Resonance

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