Design of Polymer Electrolytes Based on a Lithium Salt of a Weakly Coordinating Anion to Realize High Ionic Conductivity with Fast Charge-Transfer Reaction
Design of Polymer Electrolytes Based on a Lithium Salt of a Weakly Coordinating Anion to Realize High Ionic Conductivity with Fast Charge-Transfer Reaction
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DOI：
10.1021/jp048646r
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发表时间：
2004-07
影响因子：
3.3
通讯作者：
H. Tokuda;S. Tabata;M. A. B. H. Susan;and Kikuko Hayamizu;M. Watanabe
中科院分区：
文献类型：
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作者：
H. Tokuda;S. Tabata;M. A. B. H. Susan;and Kikuko Hayamizu;M. Watanabe
为了设计具有高离子电导率和电极界面快速电荷转移反应的聚合物电解质，研究了一种新型弱配位阴离子锂盐四（1,1,1,3,3,3-六氟-2-丙基）铝酸锂LiAl[OCH(CF3)2]4在体、非质子溶剂和聚醚中的电解质性质。虽然锂盐在较低的温度下熔化，但由于其强离子缔合作用，即使在熔融状态下，其导电性也很差。然而，在非质子溶剂中，由于阴离子对阳离子的配位能力较弱，LiAl[OCH(CF3)2]4的解离程度相对较高。这反映在离子电导率高于普通锂盐，LiN(SO2CF3)2和LiBF4，在低极性溶剂中相同浓度。在聚醚中，LiAl[OCH(CF3)2]4体系中，聚合物电解质的玻璃化转变温度（Tg）随盐浓度的升高不明显。锂…
To design polymer electrolytes with high ionic conductivity as well as fast charge-transfer reaction at the electrode interface, electrolyte properties of a novel lithium salt of a weakly coordinating anion, lithium tetra(1,1,1,3,3,3-hexafluoro-2-propyl)aluminate, LiAl[OCH(CF3)2]4, have been studied in the bulk, in aprotic solvents, and in a polyether. Although the lithium salt melts at fairly low temperature, it shows poor conductivity even in the molten state because of its strong ionic association. However, in aprotic solvents, LiAl[OCH(CF3)2]4 exhibits a relatively high degree of dissociation because of weak coordination ability of the anion toward the cation. This is reflected in the higher ionic conductivity than that of common lithium salts, LiN(SO2CF3)2 and LiBF4, at an identical concentration in the low polar solvents. In a polyether, an increase in the glass-transition temperature (Tg) of the polymer electrolytes with salt concentration is less marked in the LiAl[OCH(CF3)2]4 system. The lithium ...