Effects of addition of TiO2 nanoparticles on mechanical properties and ionic conductivity of solvent-free polymer electrolytes based on porous P(VdF-HFP)/P(EO-EC) membranes
Effects of addition of TiO2 nanoparticles on mechanical properties and ionic conductivity of solvent-free polymer electrolytes based on porous P(VdF-HFP)/P(EO-EC) membranes
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DOI：
10.1016/j.jpowsour.2006.08.022
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发表时间：
2006-11-22
影响因子：
9.2
通讯作者：
Kwak, Seung-Yeop
中科院分区：
文献类型：
--
作者：
Jeon, Jae-Deok;Kim, Myung-Jin;Kwak, Seung-Yeop
为了增强性能（即，机械性能和离子导电性），将二氧化钛（TiO 2）纳米颗粒添加到多孔膜及其包含的粘性电解质聚（环氧乙烷-共-碳酸亚乙酯）共聚物（P（EO-EC））中。具有10重量%的多孔膜，TiO 2表现出更好的性能（例如，均匀分布、高吸收和良好的机械性能），因此被选为制备聚合物电解质的基质。对于含有1.5wt.%的聚合物电解质，在25 ℃下获得5.1 × 10（-5）S cm（-1）的最大电导率。TiO 2在粘性电解质中，相比之下，3.2 × 10（-5）S cm（-1）的聚合物电解质没有TiO 2。玻璃化转变温度T-g通过添加TiO 2（最高达1.5重量%）而降低在粘性电解质中），这是由于P（EO-EC）和TiO 2之间的相互作用，这削弱了P（EO-EC）的氧化物基团和锂阳离子之间的相互作用。总体结果表明，用10重量%的聚乙烯醇制备的样品比用10重量%的聚乙烯醇制备的样品更好。用于多孔膜的TiO 2和1.5重量%用于粘性电解质的TiO 2是用于可再充电锂电池的有前途的聚合物电解质。(c)2006 Elsevier B. V.保留所有权利。
To enhance the performance (i.e., mechanical properties and ionic conductivity) of pore-filling polymer electrolytes, titanium dioxide (TiO2) nanoparticles are added to both a porous membrane and its included viscous electrolyte, poly(ethylene oxide-co-ethylene carbonate) copolymer (P(EO-EC)). A porous membrane with 10 wt.% TiO2 shows better performance (e.g., homogeneous distribution, high uptake, and good mechanical properties) than the others studied and is therefore chosen as the matrix to prepare polymer electrolytes. A maximum conductivity of 5.1 x 10(-5) S cm(-1) at 25 degrees C is obtained for a polymer electrolyte containing 1.5 wt.% TiO2 in a viscous electrolyte, compared with 3.2 x 10(-5) S cm(-1) for a polymer electrolyte without TiO2. The glass transition temperature, T-g is lowered by the addition of TiO2 (up to 1.5 wt.% in a viscous electrolyte) due to interaction between P(EO-EC) and TiO2, which weakens the interaction between oxide groups of the P(EO-EC) and lithium cations. The overall results indicate that the sample prepared with 10 wt.% TiO2 for a porous membrane and 1.5 wt.% TiO2 for a viscous electrolyte is a promising polymer electrolyte for rechargeable lithium batteries. (c) 2006 Elsevier B.V. All rights reserved.