A Superionic Conductive, Electrochemically Stable Dual-Salt Polymer Electrolyte
A Superionic Conductive, Electrochemically Stable Dual-Salt Polymer Electrolyte
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DOI：
10.1016/j.joule.2018.06.008
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发表时间：
2018-09-19
期刊：
影响因子：
39.8
通讯作者：
Zhu, Yu
中科院分区：
文献类型：
--
作者：
Li, Si;Chen, Yu-Ming;Zhu, Yu
采用相平衡指导的合理设计方法制备聚合物复合电解质，避免了爱迪生式的寻找高离子电导率聚合物电解质的研究。已经展示了在30 ° C下具有超离子电导率（1.0 mS/cm）的自立式柔性双盐基聚合物电解质膜。盐的协同效应赋予双盐聚合物电解质优异的电化学稳定性，具有0-4- 5V（相对于Li/Li+）的宽电化学窗口。脱锂/镀锂实验表明，聚合物电解质在0.05 ~ 0.5mA/cm（2）电流密度下可以安全循环。基于双盐聚合物电解质的电池在前370次循环中表现出类似于99.99%的优异的平均库仑效率。在30摄氏度下的初始容量为138 mAh/g（0.2 C），这接近于在类似条件下基于液体电解质的电池所实现的值。370次循环后的容量保持率为86%，表明聚合物电解质的长期稳定性。
A phase diagram-guided rational design was introduced to fabricate polymer composite electrolyte, avoiding Edisonian investigations in searching for a polymer electrolyte with high ionic conductivity. The free-standing, flexible, dual-salt-based polymer electrolyte films with superionic conductivity (1.0 mS/cm) at 30 degrees C have been demonstrated. The synergistic effect of salts gave the dual-salt polymer electrolyte outstanding electrochemical stability with a wide electrochemical window of 0-4-5 V (versus Li/Li+). The lithium stripping/plating experiments indicated that the polymer electrolyte could be safely cycled under current density from 0.05 to 0.5 mA/cm(2). The dual-salt polymer electrolyte-based cells exhibited excellent average coulombic efficiency of similar to 99.99% in the first 370 cycles. The initial capacity at 30 degrees C is 138 mAh/g (0.2 C), which is close to the value achieved by liquid-electrolyte-based cells under similar condition. The capacity retention is 86% after 370 cycles, indicating the long-term stability of the polymer electrolyte.