Solid-State High-Resolution NMR Studies on PEO-Based Crystalline Solid Polymer Electrolytes for Lithium-Ion Battery

Peng, Bo; Yao, Yefeng; Chen, Qun; Hu, Bingwen

doi:10.1016/bs.arnmr.2014.12.002

Cited by 4 publications

(3 citation statements)

References 50 publications

(77 reference statements)

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“…Additionally, the Li content was also varied in the beforementioned SN-free sample PEO-LiTFSI. A relevance of the Li concentration has been observed by Peng et al 30 They found that the phase structure in PEO n /LiCF 3 SO 3 complexes varied greatly with the EO/Li ratio as well, while the ratio of crystalline and amorphous phases differed. Such a huge influence could not be observed in the herein investigated PEO-LiTFSI.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…27−30 Parameters such as jump rates and activation energies can be determined by the interpretation of temperature-dependent line widths and spin−lattice relaxation times. 28,31 Peng et al 30 determined the number of phases in a PEO n :LiCF 3 SO 3 system with different EO/Li ratios via solidstate NMR which can influence the systems' mechanical and conduction properties. 32 Long et al 15,16 used solid-state NMR and impedance spectroscopy measurements to demonstrate the mobility of both cation and anion of different Li salts in SN.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In solid-state nuclear magnetic resonance (NMR), chemical shifts reflect the chemical environment and therefore provide information on phase structures. It is also a relevant method to observe molecular motions such as ion mobility and transportation. − Parameters such as jump rates and activation energies can be determined by the interpretation of temperature-dependent line widths and spin–lattice relaxation times. , Peng et al determined the number of phases in a PEO n :LiCF 3 SO 3 system with different EO/Li ratios via solid-state NMR which can influence the systems’ mechanical and conduction properties . Long et al , used solid-state NMR and impedance spectroscopy measurements to demonstrate the mobility of both cation and anion of different Li salts in SN.…”

Section: Introductionmentioning

confidence: 99%

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Solid-State NMR Revealing the Impact of Polymer Additives on Li-Ion Motions in Plastic-Crystalline Succinonitrile Electrolytes

et al. 2023

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To enhance the safety of lithium-ion batteries (LIBs), alternatives to liquid electrolytes are widely studied. One of them is the plastic-crystal succinonitrile (SN) which is able to solvate various Li salts. This system can be further extended by inserting polymers, bringing additional advantages such as higher melting points and the possibility of adjusting thermo-mechanical and electrochemical properties. The plastic-crystalline electrolyte consisting of the Li salt lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dissolved in SN was extended by adding various thermoplastic polymers, namely, polyacrylonitrile (PAN), poly(ethylene oxide) (PEO), polyethylene carbonate (PEC), and polyvinylpyrrolidone (PVP). Even small amounts (10 wt %) of added polymer to the SN-base were found to impact the Li-ion mobility. Variable temperature investigations on structure and ion dynamics were performed using static and magic angle spinning (MAS) solid-state NMR and various relaxometry measurements. Influence of the Li concentration and the polymers’ functional groups on the structure of SN and the resulting Li-ion mobility was elaborated. Activation energies and jump rates of the Li ions were determined. As a result, the PAN-containing system stands out to be a promising candidate for application in future LIBs as it shows high ion mobility, low activation energy, and a high potential for further modifications. Solid-state NMR turned out to be a reliable method and a good alternative to impedance spectroscopy measurements for investigating ion mobility behavior providing even more information.

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Section: ■ Results and Discussionmentioning

confidence: 99%