Joo Chan Gyu, Bronstein Lyudmila M, Karlinsey Robert L, Zwanziger Josef W
Department of Chemistry, Indiana University, 800 E. Kirkwood Ave., Bloomington, Indiana 47405, USA.
Solid State Nucl Magn Reson. 2002 Sep-Nov;22(2-3):235-46. doi: 10.1006/snmr.2002.0083.
Solid-state NMR studies of composite polymer electrolytes are reported. The materials consist of polyethylene oxide and an organic inorganic composite, together with a lithium salt, and are candidates for electrolytes in solid-state lithium ion batteries. Silicon and aluminum MAS and multiple quantum MAS are used to characterize the network character of the organic-inorganic composite, and spin diffusion measurements are used to determine the nanostructure of the polymer/composite blending. Multiple quantum spin counting is used to measure the ion aggregation. The NMR results are supported by Raman spectra, calorimetry, and impedance spectroscopy. From these experiments it is concluded that the composite suppresses polymer crystallization without suppressing its local mobility, and also suppresses the tendency for the ions to aggregate. This polymer composite thus appears very promising for application in lithium ion batteries.
报道了复合聚合物电解质的固态核磁共振研究。这些材料由聚环氧乙烷、有机-无机复合材料以及锂盐组成，是固态锂离子电池电解质的候选材料。采用硅和铝的魔角旋转（MAS）以及多量子MAS来表征有机-无机复合材料的网络特性，利用自旋扩散测量来确定聚合物/复合材料共混物的纳米结构。使用多量子自旋计数来测量离子聚集情况。核磁共振结果得到了拉曼光谱、量热法和阻抗谱的支持。从这些实验得出结论，该复合材料在不抑制聚合物局部流动性的情况下抑制了聚合物结晶，并且还抑制了离子聚集的趋势。因此，这种聚合物复合材料在锂离子电池中的应用前景非常广阔。
