A poly(1,3-dioxolane) based deep-eutectic polymer electrolyte for high performance ambient polymer lithium battery

作者：Wang, Yanqing; Xu, Rui; Xiao, Bowen; Lv, Dong; Peng, Yu; Zheng, Yun; Shen, Yanghuan; Chai, Jingchao^*; Lei, Xiaohua; Luo, Shiyu; Wang, Xinyi; Liang, Xinmiao^*; Feng, Jiwen; Liu, Zhihong^*

来源：Materials Today Physics, 2022, 22: 100620.

DOI：10.1016/j.mtphys.2022.100620

• Deep-eutectic
• Poly(1,3-dioxolane)
• Lithium battery
• Polymer electrolyte
• Safety

Solid-state polymer electrolytes have recently drawn intense attention as alternatives to traditional liquid electrolytes in lithium batteries due to their high energy-density and reliable safety. Unfortunately, current all-solid-state polymer electrolytes suffer from the low ionic conductivity, limiting the power density of energy storage batteries. Here, we propose a deep-eutectic electrolyte, formed directly by the interaction between poly (1,3-dioxolane) and lithium salt without other auxiliary solvents. The ionic conductivity of the designed deep-eutectic polymer electrolyte can approach to 1.5 x 10(-5) S/cm at ambient temperature, which is twenty times higher than that of polyethylene oxide-based electrolytes. Specifically, solid-state NMR verifies the interaction between oxygen in poly (1,3-dioxolane) and lithium ion. The LiFePO4/Li battery assembled with deep-eutectic polymer electrolyte delivers a discharge capacity of 139.6 mAh/g at 0.1 C and a capacity retention of 90% after 200 cycles at 0.2 C. Pouch LiFePO4/Li batteries also present excellent safety performances. This finding provides a new approach for materials engineering of polymer electrolytes for advanced lithium batteries.

• 单位
  中国科学院; 潍坊学院