A poly(1, 3-dioxolane) based deep-eutectic polymer electrolyte for high performance ambient polymer lithium battery. (January 2022)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Materials today physics. Volume 22(2022)
• Publication Date: 2022-01
• Subjects: Deep-eutectic -- Poly(1, 3-dioxolane) -- Lithium battery -- Polymer electrolyte -- Safety; Materials science -- Periodicals; Physics -- Periodicals; Electronic journals; 530.41
• DOI: 10.1016/j.mtphys.2022.100620
• Languages: English
• ISSNs: 2542-5293

Abstract

Abstract: 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 × 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. Graphical abstract: Image 1 Highlights: A deep-eutectic electrolyte, formed directly by the interaction between poly (1, 3-dioxolane) and lithium salt is proposed. The ionic conductivity of the designed deep-eutectic polymer electrolyte can approach to 1.5 × 10 −5 S/cm at ambient temperature. Solid-state NMR verifies the interaction between oxygen in PDOL and lithium ion in deep-eutectic polymer electrolyte.