NMR and conductivity study of PEO-based composite polymer electrolytes

Solid-state Li NMR with applications to the translational dynamics in ion conductors

“…Specifically, the line-shape is comprised of a narrow and a broad Gaussian resulting from the central and satellite transitions. For the central line, the line-widths with and without proton decoupling show that large parts of the broadening are the result of the 7 Li-1 H dipolar interaction [468]. While a line width of 0.6 kHz was reported for the proton decoupled 7 Li spectrum of PEO 8 -LiClO 4 , a value of 2.9 kHz was found after adding 10-15 wt% TiO 2 nanoparticles.…”

“…One-dimensional spectra. The 7 Li rigid-lattice spectra of materials containing nanometer-sized ceramic fillers resemble those of ''neat'' polymer electrolytes [466][467][468]. Specifically, the line-shape is comprised of a narrow and a broad Gaussian resulting from the central and satellite transitions.…”

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

“…Figure 10A shows a typical 2D exchange/MAS 13 C spectrum with an exchange time of 0.4 s at 308 K, while the spectra for other temperatures are not shown here. It should be noted that 12 peaks are resolved in our spectrum while only one broad peak could be observed in the previous work in this system [15,16].…”

“…They demonstrated that the cation mobility is assisted by segmental motion of the polymer [14]. Bloise et al studied the PEO/LiClO 4 and PEO/LiBF 4 systems mixed with carbon black and ceramic particles (α-Al 2 O 3 , γ-Al 2 O 3 , and TiO 2 ) by measuring the 1 H and 7 Li lineshapes and spin-lattice relaxation times as a function of temperature [15,16]. Spěváček et al studied the PEO/LiCF 3 SO 3 complexes and found out that the chemical shifts of 1 H and 13 C are the same for PEO in the amorphous and crystalline phases, indicating the same local structures in these two phases; they also measured the 1 H !…”

High ion-conducting solid polymer electrolytes based on blending hybrids derived from monoamine and diamine polyethers for lithium solid-state batteries

“…The changes in the stainless steel surface might contribute to the observed lower current. 66 When the voltage crossed over 5 V, the current increased considerably, suggesting that the decomposition process of the electrolyte had started. The oxidation of some trace species generated a hump between 2 and 3.5 V for the blended hybrid SPEs.…”