Integrating flexible PMIA separator and electrode for dealing with multi-aspect issues in Li–S batteries. (1st November 2020)

• Record Type: Journal Article
• Authors: Sun, Chuang-Chao; Song, You-Zhi; Yan, Yan; Yuan, Jia-Jia; Huang, Zheng; Fang, Li-Feng; Zhu, Bao-Ku
• Is Part Of: Electrochimica acta. Volume 359(2020)
• Publication Date: 2020-11-01
• Subjects: Integrated electrode -- Flexible -- PMIA -- NIPS -- Lithium−sulfur batteries; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2020.136987
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: Flexible PMIA separator and Li-S cathode were successfully integrated with excellent robustness via a simple NIPS method. The cells assembled with the integrated electrodes can deal with volume expansion of sulfur, diffusion of polysulfides and dendrite growth of Li simultaneously. The resultant cell exhibits a capacity of 773.6 mAh g −1 at 1 C and after 600 cycles, the capacity still remains at 565.5 mAh g −1 with the calculated capacity fade of 0.045% per cycle. Abstract: Lithium−sulfur (Li−S) batteries are of great interest in next-generation flexible electronic devices for their much higher energy density. However, current Li−S batteries are still facing the problem about rational construction of the flexible power sources. Herein, a novel flexible and integrated electrode is fabricated through a non-solvent induced phase separation (NIPS) method with poly(m-phenylene isophthalamide) (PMIA) as the flexible support for Li-S batteries. Notably, the integrated electrode shows the capability of adapting the volume expansion of cathode materials, inhibiting the diffusion of lithium polysulfides and suppressing the dendrite growth of Li. As a result, battery assembled with the fabricated electrode exhibits a capacity of 773.6 mAh g −1 at 1 C. After 600 cycles, the capacity still remains at 565.5 mAh g −1 with the calculated capacity fade of 0.045% per cycle. This proposed strategy is advanced and feasible, which has great potential in next-generation portable electronic devices. Graphical abstract: Image, graphical abstract