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锂离子电池固态电解质界面膜中的生长应力
在锂离子电池化成阶段,活性材料会与电解液在固-液相界面上发生反应,形成一层覆盖于活性材料表面的固态电解质界面(SEI)。SEI虽可有效防止溶剂分子共嵌入,避免对活性材料造成破坏。然而,SEI不断形成的过程将消耗电解液中的...
贺耀龙胡宏玖李书峰
关键词:锂离子电池生长应力
固态聚合物电解质的松弛行为研究
锂离子电池环境中的固态聚合物电解质(SPE)松弛机制及其电学性能演化是目前亟待解决的前沿性科学问题。本文采用交流阻抗谱测试详细分析了锂盐浓度、电场强度和离子迁移耦合作用下物理老化进程对聚甲基丙烯酸甲酯基SPE松弛行为的影...
樊晓鸣; 胡宏玖; 贺耀龙; 黄大卫;
关键词:固态电解质物理老化离子电导率高聚物
Creep performance of PVC aged at temperature relatively close to glass transition temperature
2012年
In order to predict the mechanical performance of the polyvinyl chloride (PVC) at a high operating temperature, a series of short-term tensile creep tests (one- tenth of the physical aging time) of the PVC are carried out at 63 ℃ with a small constant stress by a dynamic mechanical analyzer (DMA). The Struik-Kohlrausch (SK) formula and Struik shifting methods are used to describe these creep data for various physical aging time. A new phenomenological model based on the multiple relaxation mechanisms of an amorphous polymer is developed to quantitatively characterize the SK parameters (the initial creep compliance, the characteristic retardation time, and the shape factor) determined by the aging time. It is shown that the momentary creep compliance curve of the PVC at 63℃ can be very well fitted by the SK formula for each aging time. However, the SK parameters for the creep curves are not constant during the aging process at the elevated temperatures, and the evolution of these parameters and the creep rate versus aging time curves at the double logarithmic coordinafes have shown a nonlinear phenomenon. Moreover, the creep master curves obtained by the superposition with the Struik shifting methods are unsatisfactory in such a case. Finally, the predicted results calculated from the present model incorporating with the SK formula are in excellent agreement with the creep experimental data for the PVC isothermally aged at the temperature relatively close to the glass transition temperature.
周志红贺耀龙胡宏玖赵峰张晓龙
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